172 results on '"Gürkan, Hakan"'
Search Results
2. A novel biometric identification system based on fingertip electrocardiogram and speech signals
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Guven, Gokhan, Guz, Umit, and Gürkan, Hakan
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- 2022
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3. Investigation of Pogz Gene Variants in Non-Syndromic Autism Spectrum Disorder.
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Tozkır, Jülide, Yıldırım, Gökberk, Demir, Selma, Palabıyık, Orkide, Görker, Işık, and Gürkan, Hakan
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DIAGNOSIS of autism ,GENETICS of autism ,SOCIAL sciences ,GENOMICS ,CLASSIFICATION of mental disorders ,DNA ,CHI-squared test ,DESCRIPTIVE statistics ,GENETIC variation ,MESSENGER RNA ,NUCLEOTIDES ,GENETIC polymorphisms ,CHROMOSOMES ,ASPERGER'S syndrome ,CASE studies ,DATA analysis software ,SEQUENCE analysis ,COMORBIDITY ,GENOTYPES - Abstract
Introduction: Genetic factors play an important role in the etiopathogenesis of autism spectrum disorder (ASD). The Pogo Transposable Element with ZNF Domain protein (POGZ) gene (MIM*614787) has been reported to be one of the most frequently mutated genes associated with ASD. This study aims to analyze the exonic regions of the POGZ gene in individuals diagnosed with non-syndromic ASD. Methods: Fifty-one non-syndromic cases diagnosed with ASD according to the DSM-V diagnostic criteria, aged 2-18 years, were included in the study. The healthy control group consisted of 50 children of similar age groups without neurodevelopmental problems. Amplicons produced using deep intronic primers covering the mRNA-encoded regions of the POGZ gene from at least 50 base pairs were sequenced by Next Generation Sequencing Analysis. Results: No pathogenic or likely pathogenic variants reported in open-access databases (ClinVar, HGMD, etc.) were detected in the case group. In the ASD and healthy control groups, rs113396244, rs11204811, rs779479223, rs772352054, rs3831142, rs112072925, rs227453 and rs142860188 variants were determined. The rs3831142, rs112072925, rs2274535, rs142860188 variants were found statistically significant in the ASD group. The distribution of the cases with detected single nucleotide polymorphisms (SNPs) according to gender was not statistically significant. Conclusion: The variants identified as statistically significant within the patient group are situated in regions that encompass both the HP1-ZNF and DDE domains of the protein. Given the crucial role that the DDE domain plays, particularly in fetal brain development and neurogenesis, these four variants may potentially possess modifying and/or predisposing effects in the context of ASD. [ABSTRACT FROM AUTHOR]
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- 2024
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4. A Case of Diabetes Mellitus Type MODY5 as a Feature of 17q12 Deletion Syndrome.
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Köstek, Hümeyra Yaşar, Çömlek, Fatma Özgüç, Gürkan, Hakan, Özkayın, Emine Neşe, and Kökenli, Filiz Tütüncüler
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ENDOCRINOLOGY ,CHILD psychopathology ,MAGNESIUM ,GLYCOSYLATED hemoglobin ,COMPUTED tomography ,MATURITY onset diabetes of the young ,CHROMOSOME abnormalities ,MAGNETIC resonance imaging ,LIVER cells ,GENE expression ,PEDIATRICS ,C-peptide ,PANCREAS ,TYPE 2 diabetes ,POLYURIA ,MICROARRAY technology ,GENETIC mutation ,KIDNEY diseases ,HYPOMAGNESEMIA ,POLYDIPSIA ,GENETIC testing ,CHILDREN - Abstract
Maturity onset diabetes of the young (MODY) is characterized by noninsulin-dependent diabetes diagnosed before the age of 25 years with an autosomal dominant inheritance. Rare mutations in the hepatocyte nuclear factor-1-beta (HNF1B) gene produce a syndrome that resembles MODY. About half of patients diagnosed with MODY type 5 due to HNF1B variants, carry a whole gene deletion, known as 17q12 deletion syndrome. 17q12 deletion syndrome is a rare chromosomal anomaly and is typified by deletion of more than 15 genes, including HNF1B resulting in kidney abnormalities and renal cysts, a diabetes syndrome and neurodevelopmental or neuropsychiatric disorders. A 12-year-old girl was referred after high blood sugar was detected in the hospital where she presented with polyuria and polydipsia, which had persisted for one month. Her serum magnesium (Mg) level was low at 1.5 mg/dL (normal value 1.6-2.6) and glycated hemoglobin was 14% (normal value 3.6-5.8) concurrent with a c-peptide of 1.54 ng/mL (normal value 0.8-4). MODY5 was suspected but the NGS gene panel (ABCC8, BLK, CEL, GCK, HNF1A, HNF1B, HNF4A, INS, KCNJ11, KLF11, NEURODD1, PAX4, PDX1, RFX6, ZFP57, GLIS3, FOXP3, NEUROG3, G6PC2) did not identify any abnormality. During follow-up, her serum Mg remained low (1.2 mg/ dL) together with elevated urinary Mg excretion at 172.5 mg/day. An HNF1B variant was again suspected in a patient with chronic hypomagnesemia with normal basal C peptide level. Abdominal computed tomography and magnetic resonance imaging revealed a 43 mm diameter, cystic lesion in the head of the pancreas, with agenesis of the pancreatic neck, trunk and tail. Genetic testing using a microarray analysis was subsequently performed and a heterozygous deletion at 17q12, including HNF1B, was detected. In case of clinical suspicion of HNF1B variants, further genetic examination using other techniques such as MLPA and CGH array may be required to detect the variant. This is because deletions and duplications may not be detected using next generation screening panel techniques. [ABSTRACT FROM AUTHOR]
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- 2024
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5. Investigation of the Genetic Etiology in Idiopathic Generalized Epileptic Disorders by Targeted Next-generation Sequencing Technique
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Atlı, Engin, primary, Gürkan, Hakan, additional, Güldiken, Babürhan, additional, Eker, Damla, additional, Yalçıntepe, Sinem, additional, Demir, Selma, additional, and İkbal Atlı, Emine, additional
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- 2023
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6. A Case of Diabetes Mellitus Type MODY5 as a feature of 17q12 Deletion Syndrome
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Yaşar Köstek, Hümeyra, primary, Özgüç Çömlek, Fatma, additional, Gürkan, Hakan, additional, Özkayın, Emine Neşe, additional, and Tütüncüler Kökenli, Filiz, additional
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- 2022
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7. ECG based biometric identification method using QRS images and convolutional neural network
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Gürkan, Hakan, Hanilçi, Ayça, and Gürkan, Hakan
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biometrics ,lcsh:TA1-2040 ,[No Keywords] ,qrs images ,evrişimsel sinir ağı (esa) ,electrocardiogram (ecg) ,biyometrik ,lcsh:Engineering (General). Civil engineering (General) ,convolutional neural network (cnn) ,elektrokardiyogram (ekg) ,qrs imgeleri - Abstract
Medikal uygulamalarda yaygın olarak kullanılan elektrokardiyogram (EKG) işaretleri, aldatma saldırılarına karşı güçlü kılan yaşam işareti olma özelliği sayesinde, biyometrik uygulamalar için bir biyometrik büyüklük olarak kullanılmaya başlanmıştır. Bilgisayar sistemlerinin hesaplama güçlerinin artmasına bağlı olarak kişi tanıma ve sınıflandırma doğruluğunu arttırmak amacıyla son yıllarda EKG biyometrik tanıma için birkaç evrişimsel sinir ağı (ESA) tabanlı yöntem sunulmuştur. Bu çalışmada, QRS (QRS dalgası) imgeleri ve 2 boyutlu ESA yapısı kullanılarak EKG işaretleri tabanlı bir biyometrik tanıma yöntemi önerilmiştir. Önerilen yöntemde, ilk olarak EKG işaretleri gürültü temizleme ve QRS belirleme algoritmalarından geçirilerek QRS bölütlerine ayrılmıştır. Elde edilen bu bölütler R noktalarına göre hizalandıktan sonra 256x256 büyüklüğünde QRS imgesi olarak adlandırılan 2 boyutlu EKG işaretlerine dönüştürülmüştür. Son olarak elde edilen bu QRS imgelerinin giriş olarak uygulandığı 2 boyutlu bir ESA modeli geliştirilerek biyometrik tanıma gerçekleştirilmiştir. Önerilen yöntemin başarımı diğer ESA tabanlı EKG biyometrik tanıma yöntemleri ile karşılaştırmalı olarak incelenmiştir. Önerilen yöntem 46 kişiden oluşan bir EKG veri kümesi üzerinde %98.08 doğruluk oranı ve %99.275 kişi tanıma oranı sağlamıştır. Electrocardiogram (ECG) signals, which are commonly used in medical applications, have been started to use as a biometric modality for biometric applications thanks to its liveness indicator that makes it stronger against spoofing attacks. Due to improving computational power of computer systems, several convolutional neural network (CNN) based methods have been recently proposed for ECG biometric identification in order to increase identification performance and classification accuracy. In this work, we proposed an ECG based biometric identification method using QRS (QRS wave) images and two-dimensional CNN. In the† proposed method, ECG signals were segmented by applying noise removing and QRS detection algorithms. After these segments were aligned according to their R-points, they were transformed to two-dimensional ECG signals called QRS images of size 256x256. Finally, biometric identification task was achieved by developing a CNN based ECG biometric identification method which uses the QRS images as an input. The identification performance of the proposed method was compared to other CNN based ECG biometric identification methods proposed in the literature. The experimental results show that the proposed method provides an accuracy of 98.08% and an identification rate of 99.275% for a public ECG database of 46 persons.
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- 2020
8. Clinical and molecular evaluation of MEFV gene variants in the Turkish population: a study by the National Genetics Consortium
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ERTEN, ŞÜKRAN, DÜNDAR, MUNİS, Altinay, Mert, Bakir-Gungor, Burcu, TEMEL, ŞEHİME GÜLSÜN, AKIN, HALUK, ARTAN, SEVİLHAN, Acar, Aynur, Cora, Tulin, ŞAHİN, FERİDE İFFET, DURSUN, AHMET, Sezer, Ozlem, GÜRKAN, HAKAN, Erdogan, Murat, Kebudi, Rejin, ÇİLİNGİR, OĞUZ, AYKUT, AYÇA, Durmaz, Burak, EMMUNGİL, HAKAN, KARACA, EMİN, Emekli, Rabia, Gonen, Gizem Akinci, Onay, Huseyin, DURMAZ, ASUDE, Balta, Burhan, Aynekin, Busra, KANDEMİR, NEFİSE, Kiraz, Aslihan, ÇOĞULU, MUHSİN ÖZGÜR, Gunes, Meltem Cerrah, KARADUMAN, NESLİHAN, Ozkayin, Nese, ÖZKINAY, FERİŞTAH FERDA, YALÇINTEPE, SİNEM, ÇOLAK, Fatma, SUBAŞIOĞLU, Aslı, Haziyeva, Konul, Bayramicli, Oya Uygur, Bilge, Ilmay, Kaya, Niyazi, Bayram, Arslan, Erguzeloglu, Cemre Ornek, KAVUKÇU, SALİH, DOĞAN, BERKCAN, Tuncel, Gulten, Mocan, Gamze, Kale, Hamdi, Gurakan, Figen, Uyguner, Zehra Oya, Tunc, Betul, Kuru, Seda, Boz, Mehmet, Dundar, Ayca, AKALIN, HİLAL, KAZIMLI, ULVIYYA, Zeybel, Mujdat, BAYSAL, KÜBRA, Zamani, Aysegul, GEÇKİNLİ, BİLGEN BİLGE, Uzel, Veysiye Hulya, DURAK ARAS, BEYHAN, Kiranatlioglu, Kubra, Ates, Esra Arslan, KULAK ABAY, HANDE, COŞKUN, MERT, EM, SERDA, ALTIOK CLARK, ÖZDEN, TOYLU, ASLI, TOZKIR, HİLMİ, Komesli, Zeynep, KOCAGİL, SİNEM, ÇEVİK, MUHAMMER ÖZGÜR, Eroz, Recep, Demirtas, Mercan, FIRAT, CEM KORAY, ERGÜN, MEHMET ALİ, YÜCE KAHRAMAN, Çiğdem, Yigit, Serbulent, Sanri, Aslihan, Siniksaran, Betul Seyhan, DEMİR, MİKAİL, ÖZÇELİK, FIRAT, Dundar, Bilge, BAŞ, HASAN, SUSAM, EZGİ, Karakoyun, Hilal Keskin, KARASU, NİLGÜN, Kenanoglu, Sercan, SAATÇİ, ÇETİN, ÖZKUL, YUSUF, Temena, Arda, Yuksel, Berrin, ÇAĞLAYAN, AHMET OKAY, BAHADIR, Oğuzhan, Genc, Gunes Cakmak, KEKLİKCİ, ALİ RIZA, Altunoglu, Umut, Sarac, Elif, Baskin, Esra Sidika, TOSUN, ÖZGÜR, Tulay, Pinar, Kabayegit, Zehra Manav, Altan, Mustafa, Mardan, Lamiya, Sayar, Ceyhan, ERZURUMLUOĞLU GÖKALP, EBRU, ÇETİN, GÖKHAN OZAN, Turkgenc, Burcu, Arslan, Serap, Tumer, Sait, NUR, BANU, Ergoren, Mahmut Cerkez, Onder, Nerin Bahceciler, KOÇAK, NADİR, Tasdemir, Mehmet, NERGİZ, SÜLEYMAN, Beyitler, Ilke, KUTLAY, NÜKET, TUNCALI, TİMUR, BEYAZIT, ŞERİFE BÜŞRA, SEMERCİ GÜNDÜZ, CAVİDAN NUR, SIDAR DUMAN, YEŞİM, Ergun, Sezen Guntekin, Ercal, Derya, ALEMDAR, ADEM, ALIYEVA, LAMIYA, ÖZEMRİ SAĞ, ŞEBNEM, Atasever, Umut, AYDIN, ZAFER, Thahir, Adam, TATAR, Abdulgani, ILGIN RUHİ, HATİCE, TERZİ, YUNUS KASIM, BİŞGİN, ATIL, Dincer, Selin Akad, ÖZDEMİR, ÖZTÜRK, ÜLGENALP, AYFER, PERÇİN, FERDA EMRİYE, YILDIRIM, MALİK EJDER, Ulu, Memnune Sena, Solak, Mustafa, Elmas, Muhsin, ÖZDEMİR ERDOĞAN, MÜJGAN, Zararsiz, Gozde Erturk, DEMİR, HÜSEYİN, ÇALIŞ, MUSTAFA, BAŞKOL, MEVLÜT, Aymelek, Huri Sema, ALTINTAŞ, ZUHAL, Eraslan, Serpil, KURT, EMİN EMRE, Erdem, Levent, FAHRİOGLU, UMUT, GÜLEÇ CEYLAN, GÜLAY, Sahin, Izem Olcay, CEYLAN, AHMET CEVDET, TUĞ BOZDOĞAN, SEVCAN, BOĞA, İBRAHİM, Yildiz, Saliha Handan, KARABULUT, HALİL GÜRHAN, YILMAZ, MUSTAFA, TEKEŞ, SELAHADDİN, SILAN, FATMA, KOCABEY, MEHMET, KOÇ, ALTUĞ, ÇANKAYA, TUFAN, BAĞIŞ, HAYDAR, BORA, ELÇİN, GİRAY BOZKAYA, ÖZLEM, ÖZDEMİR, Sevda Yeşim, ÖNAL, MÜGE GÜLCİHAN, ŞENEL, ABDURRAHMAN SONER, POYRAZOĞLU, MUAMMER HAKAN, PAÇ KISAARSLAN, AYŞENUR, GÜRSOY, ŞEBNEM, YÜCE, HÜSEYİN, DUMAN, NİLGÜN, BOZKURT, GÖKAY, Yararbas, Kanay, YILDIRIM, MAHMUT SELMAN, ARMAN, AHMET, MIHÇI, ERCAN, Dicle Üniversitesi, Tıp Fakültesi, Dahili Tıp Bilimleri Bölümü, Tıbbi Genetik Ana Bilim Dalı, Tekeş, Selahaddin, Üzel, Veysiye Hülya, Em, Serda, and DÜNDAR M., FAHRİOGLU U., Yildiz S. H., Bakir-Gungor B., TEMEL Ş. G., AKIN H., ARTAN S., Cora T., ŞAHİN F. İ., DURSUN A., et al.
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GENETİK VE KALITIM ,Genotype ,Turkey ,PROTEIN ASC ,MEFV ,Life Sciences (LIFE) ,Molecular Biology and Genetics ,KAPPA-B ,Genotype-phenotype correlations ,Sağlık Bilimleri ,Familial Mediterranean fever ,National Genetics Consortium ,AUTOINFLAMMATION ,ACTIVATION ,Tıbbi Genetik ,Yaşam Bilimleri ,Health Sciences ,Genetics ,Humans ,PYRIN ,GENETICS & HEREDITY ,Molecular Biology ,Moleküler Biyoloji ve Genetik ,Genetics (clinical) ,ASSOCIATIONS ,Internal Medicine Sciences ,MUTATIONS ,Temel Bilimler ,Life Sciences ,General Medicine ,Dahili Tıp Bilimleri ,Tıp ,PREVALENCE ,MOLECULAR BIOLOGY & GENETICS ,Genetics, Population ,Phenotype ,Yaşam Bilimleri (LIFE) ,AMYLOIDOSIS ,Mutation ,Medicine ,Natural Sciences ,Medical Genetics - Abstract
© 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.Familial Mediterranean fever (FMF) is a monogenic autoinflammatory disorder with recurrent fever, abdominal pain, serositis, articular manifestations, erysipelas-like erythema, and renal complications as its main features. Caused by the mutations in the MEditerranean FeVer (MEFV) gene, it mainly affects people of Mediterranean descent with a higher incidence in the Turkish, Jewish, Arabic, and Armenian populations. As our understanding of FMF improves, it becomes clearer that we are facing with a more complex picture of FMF with respect to its pathogenesis, penetrance, variant type (gain-of-function vs. loss-of-function), and inheritance. In this study, MEFV gene analysis results and clinical findings of 27,504 patients from 35 universities and institutions in Turkey and Northern Cyprus are combined in an effort to provide a better insight into the genotype-phenotype correlation and how a specific variant contributes to certain clinical findings in FMF patients. Our results may help better understand this complex disease and how the genotype may sometimes contribute to phenotype. Unlike many studies in the literature, our study investigated a broader symptomatic spectrum and the relationship between the genotype and phenotype data. In this sense, we aimed to guide all clinicians and academicians who work in this field to better establish a comprehensive data set for the patients. One of the biggest messages of our study is that lack of uniformity in some clinical and demographic data of participants may become an obstacle in approaching FMF patients and understanding this complex disease.
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- 2022
9. Comprehensive Genetic Analysis of RASopathy in the Era of Next-Generation Sequencing and Definition of a Novel Likely Pathogenic KRAS Variation
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Demir, Selma, primary, Yaşar Köstek, Hümeyra, additional, Sanrı, Aslıhan, additional, Yıldırım, Ruken, additional, Özgüç Çömlek, Fatma, additional, Yalçıntepe, Sinem, additional, Deveci, Murat, additional, Atlı, Emine İkbal, additional, Atlı, Engin, additional, Eker, Damla, additional, Gürkan, Hakan, additional, and Tütüncüler Kökenli, Filiz, additional
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- 2022
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10. The efficiency of cinacalcet treatment in delaying parathyroidectomy in a case with neonatal severe hyperparathyroidism caused by homozygous mutation in the CASR gene
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Özgüç Çömlek, Fatma, primary, Demir, Selma, additional, Gürkan, Hakan, additional, İnan, Mustafa, additional, Sezer, Atakan, additional, Dilek, Emine, additional, and Kökenli, Filiz, additional
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- 2022
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11. A Novel Variant in the ACVRL1 Gene in a Patient with Cirrhosis and Hereditary Hemorrhagic Telangiectasia
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Baysal, Mehmet, primary, Alkış, Nihan, additional, Gürkan, Hakan, additional, and Demir, Ahmet Muzaffer, additional
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- 2021
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12. The Application of Next Generation Sequencing Maturity Onset Diabetes of the Young Gene Panel in Turkish Patients from Trakya Region
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Yalçıntepe, Sinem, primary, Özgüç Çömlek, Fatma, additional, Gürkan, Hakan, additional, Demir, Selma, additional, Atlı, Emine İkbal, additional, Atlı, Engin, additional, Eker, Damla, additional, and Tütüncüler Kökenli, Filiz, additional
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- 2021
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13. Investigation of the Relationship Between Genome Wide Association Studies-derived Polymorphisms and Differentiated Thyroid Cancer Risk in a Turkish Population
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Demir, Selma, Gürkan, Hakan, Çelik, Mehmet, Sezer, Atakan, Eker, Damla, Güldiken, Sibel, Palabiyik, Orkide, and Tozkır, Hilmi
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Thyroid carcinoma ,Gene Polymorphism ,Common Variants ,Susceptibility Loci ,Carcinoma ,GWAS ,genetic risk - Abstract
Background: Thyroid cancer is the most common malignancy of endocrine system. Genome Wide Association Studies (GWAS) revealed a number of common variants associated with thyroid cancer risk. In this study, we aimed to investigate the association of these known variants with thyroid cancer risk in a Turkish population living in Trakya region. Methods: The study included 97 cases of differentiated thyroid cancer and 379 healthy controls. Real-Time Polymerase Chain Reaction (RT-PCR) method was used for the genotyping of rs965513, rs944289, rs966423 rs2439302 polymorphisms. Results: There was no statistically significant difference between patients and controls in terms of SNP genotype and allele frequencies. The distribution of cumulative genetic risk scores between patients and controls was also not significantly different. In the multiple logistic regression analysis (MLR), it was observed that the relationship of rs2439302 polymorphism GG genotype with thyroid cancer risk has a trend to be significant ((p = 0.067, 95%CI: 2.947 (0.928-9.357)). Conclusion: We suggest that the confirmation of the association of common variants with thyroid cancer in different populations will contribute to make a consensus on global risk alleles. The marginal significance of the association of rs2439302 with thyroid carcinoma risk shown in our study supports the need for functional studies on the role of this polymorphism in thyroid carcinoma. Trakya University Scientific Research Projects UnitTrakya University [TuBAP 2016/132] This study has been financially supported by the Trakya University Scientific Research Projects Unit (TuBAP 2016/132) .
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- 2021
14. INVESTIGATION OF THE RELATIONSHIP OF NLRP2, NLRP7 AND KHDC3L GENE VARIATIONS IN PATIENTS WITH RECURRENT PREGNANCY LOSS HISTORY
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Moustafa, Netzat and Gürkan, Hakan
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NLRP2 ,KHDC3L ,Recurrent Pregnancy Loss ,Tekrarlayan gebelik kaybı ,NLRP7 - Abstract
Tekrarlayan gebelik kaybı (TGK), üreme sağlığında önemli bir problemdir. TGK vakalarının yaklaşık %50'sinin nedeni açıklanamamıştır. TGK etiyolojisinde genetik temeli anlamak, teşhis ve prognoz için önemlidir. Bu nedenle çalışmamızda kadın üreme sisteminde önemli işlevleri olan KHDC3L, NLRP2 ve NLRP7 genlerinin TGK ile ilişkisini araştırmayı amaçladık. Çalışmaya Trakya Üniversitesi Tıp Fakültesi Tıbbi Genetik Anabilim Dalı Genetik Hastalıklar Tanı Merkezi polikliniğine TGK öyküsü ile başvuran 96 kadın hasta dahil edildi. Hastalarda KHDC3L, NLRP2 ve NLRP7 genleri NGS yöntemi ile olası varyasyonlar açısından analiz edildi. NLRP7 geninde rs73055288, rs1276342435, NLRP2 geninde rs200815567, rs199475713, rs147585490, rs149897717, rs145361990 ve KHDC3L geninde rs1032302298, rs553706174 varyasyonlarını saptadık. Çalışmamızda açık erişimli veri tabanlarında ve/veya ACMG-2015 kriterlerine göre “patojenik, olası patojenik varyasyon” saptanmadı. Çalışmamızda saptamış olduğumuz sekiz varyasyonun global allel frekansı 0.004’den küçüktü (0.004-0.000004). Bu varyasyonların normal fertiliteye sahip kadınlarda da araştırılmasının literatüre önemli katkılar sağlayacağı öngörüsündeyiz. Recurrent pregnancy loss (RPL) is an important problem in reproductive health. The cause of approximately 50% of RPL cases has not been explained. Understanding the genetic basis in the etiology of RPL is important for diagnosis and prognosis. Therefore, in our study, we aimed to investigate the relationship of KHDC3L, NLRP2 and NLRP7 genes with RPL, which have important functions in the female reproductive system. Ninety-six female patients who applied to the outpatient clinic of Trakya University Medical Faculty, Department of Medical Genetics, Genetic Diseases Diagnosis Center with a history of RPL were included in the study. KHDC3L, NLRP2 and NLRP7 genes were analyzed in terms of possible variations by NGS method. We detected rs73055288, rs1276342435 in the NLRP7 gene, rs200815567, rs199475713, rs147585490, rs149897717, rs145361990 in the NLRP2 gene and rs1032302298, rs553706174 in the KHDC3L gene. In our study, no "pathogenic, likely pathogenic variation" was found in open access databases and / or according to ACMG-2015 criteria. The global allele frequency of the eight variations we detected in our study was less than 0.004 (0.004-0.000004). We anticipate that investigating these variations in women with normal fertility will contribute significantly to the literature
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- 2021
15. RETROSPECTIVE ANALYSIS OF ALPHA GLOBIN COPY NUMBER VARIATIONS DETERMINED BY MLPA IN THE TRAKYA REGION
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Demir, Selma, primary, Gürkan, Hakan, additional, Eker, Damla, additional, Yalçıntepe, Sinem, additional, Atlı, Emine, additional, and Atlı, Engin, additional
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- 2021
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16. TRAKYA BÖLGESİ ERKEK İNFERTİLİTE OLGULARINDA Y KROMOZOM MİKRODELESYONLARI VE SİTOGENETİK ANOMALİLERİN SIKLIĞI: TEK MERKEZ DENEYİMİ
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YALÇINTEPE, Sinem, EKER, Damla, and GÜRKAN, Hakan
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Health Care Sciences and Services ,Y microdeletion,male infertility,chromosome anomaly,azoospermia,oligospermia ,Sağlık Bilimleri ve Hizmetleri ,Y mikrodelesyon,erkek infertilitesi,kromozom anomalisi,azospermi,oligospermi - Abstract
Objective: Genetic factors, including Y chromosome microdeletions, are responsible for about 10% of male infertility cases and are particularly associated with azoospermia or severe oligozoospermia. In our study, it was aimed to determine the frequency of Y chromosome microdeletions in the Thrace region and to provide information about the heterogeneous phenotype in infertile male patients with AZF microdeletion. Material and Method: Chromosome analysis and Y chromosome microdeletion analysis were performed on 446 male patients with non-obstructive azoospermia or oligozoospermia, who applied to the Trakya University Hospital Medical Genetics Department Genetic Diseases Diagnosis Center clinic between the years 2011-2019. Results: Y chromosome microdeletion was detected in 19 (4.26%) of 446 cases. Structural chromosomal anomalies were accompanied in 5 of 19 cases with Y chromosome microdeletions. Three hundred fifty-two cases had no Y chromosome microdeletion, 35 (9.94%) of these cases had Klinefelter syndrome, 1 (0.28%) case had Klinefelter syndrome low grade mosaicism, 3 (0.85%) cases had Robertsonian translocation carriage, and 1 (0.28%) had Reciprocal translocation carriage. Conclusion: Y chromosome microdeletion screening in non-obstructive azoospermic or oligosoospermic infertile male patients has prognostic value and affects clinical prognosis. The results of our study support the proposal to perform Y chromosome microdeletion analysis before microTESE in azoospermic or oligosoospermic infertile male patients as reported in the literature., Amaç: Y kromozom mikrodelesyonları dahil olmak üzere genetik faktörler erkek infertilitesi olgularının yaklaşık %10’undan sorumludur ve özellikle azoospermi veya ciddi oligozoospermi ile ilişkilidir. Çalışmamızda Trakya bölgesi’nde Y kromozom mikrodelesyon sıklığını saptamak ve AZF mikrodelesyonu olan infertil erkek olgularda heterojen fenotip hakkında bilgi sunmak amaçlanmıştır. Gereç ve Yöntem: Trakya Üniversitesi Hastanesi Tıbbi Genetik Anabilim Dalı Genetik Hastalıklar Değerlendirme Merkezi Polikliniği’ne 2011-2019 yılları arasında infertilite nedeni ile müracaat eden, non-obstruktif azoospermik veya oligozoospermik 446 erkek olguda konvansiyonel sitogenetik yöntemle karyotip analizi ve Y kromozom mikrodelesyon analizi yapıldı. Bulgular: Dört yüz kırk altı olgunun 19’unda (%4,26) Y kromozom mikrodelesyonu saptandı. Y kromozom mikrodelesyonu saptanan 19 olgunun 5’inde yapısal kromozom anomalileri eşlik etmekteydi. Y kromozomunda mikrodelesyon saptanmayan 352 olgunun 35’inde (%9,94) Klinefelter sendromu, 1’inde (%0,28) düşük oranlı Klinefelter sendromu mozaikliği, 3’ünde (%0,85) Robertsonian translokasyon taşıyıcılığı, 1’inde (%0,28) resiprokal translokasyon taşıyıcılığı saptandı. Sonuç: Non-obstruktif azoospermik veya oligozoospermik infertil erkek olgularda Y kromozom mikrodelesyon taraması prognostik değere sahiptir ve klinik prognozu etkilemektedir. Çalışmamızın sonuçları literatürde bildirilmiş olan azoospermik veya oligozoospermik infertil erkek olgularda mikroTESE öncesinde Y kromozom mikrodelesyon analizi yapılması önerisini desteklemektedir.
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- 2020
17. Prenatal diagnosis of 20p13 microdeletion syndrome
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Yener, Cem, primary, Sayın, Cenk, additional, İnan, Cihan, additional, Gürkan, Hakan, additional, Atlı, Emine İkbal, additional, Atlı, Engin, additional, Altan, Esra, additional, Ateş, Sinan, additional, and Varol, Füsun, additional
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- 2021
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18. Investigation of Genes Associated With Atherosclerosis in Patients With Systemic Lupus Erythematosus
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BALCI, Mehmet Ali, primary, ATLI, Engin, additional, and GüRKAN, Hakan, additional
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- 2021
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19. TRAKYA BÖLGESİ ERKEK İNFERTİLİTE OLGULARINDA Y KROMOZOM MİKRODELESYONLARI VE SİTOGENETİK ANOMALİLERİN SIKLIĞI: TEK MERKEZ DENEYİMİ
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Yalçıntepe, Sinem, primary, Eker, Damla, additional, and Gürkan, Hakan, additional
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- 2021
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20. A YOLOv3 Based Smart City Application For Children’s Playgrounds
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İNKAYA, Mehmet Fatih, primary and GÜRKAN, Hakan, additional
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- 2020
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21. Wiedemann-Steiner Syndrome as a Differential Diagnosis of Cornelia de Lange Syndrome Using Targeted Next-Generation Sequencing: A Case Report
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Demir, Selma, primary, Gürkan, Hakan, additional, Öz, Veysel, additional, Yalçıntepe, Sinem, additional, Atlı, Emine İ., additional, and Atlı, Engin, additional
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- 2020
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22. Two Cystic Fybrosis Cases with Firstly Reported Compund Heterozygous Variants
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Yalçıntepe, Sinem, primary, Gürkan, Hakan, additional, Atlı, Engin, additional, Sayın, Niyazi Cenk, additional, and Başaran, Ümit Nusret, additional
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- 2020
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23. Genetic Diagnosis of Hereditary Hemorrhagic Telangiectasia: Four Novel Pathogenic Variations in Turkish Patients
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Baysal, Mehmet, Demir, Selma, Ümit, Elif G., Gürkan, Hakan, Baş, Volkan, Gülarslan, Sedanur Karaman, and Demir, Ahmet Muzaffer
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[No Keywords] - Abstract
Aims: Hereditary hemorrhagic telangiectasia is an autosomal dominant disorder characterized by telangiectasia, epistaxis, and vascular malformations. Pathogenic mutations were found in ENG, AVCRL1, SMAD4, and GDF genes. In this study, we present our database of patients with hereditary hemorrhagic telangiectasia regarding the phenotype-genotype relations and discuss two novel ENG gene pathogenic variations in two unrelated families. Methods: Next Generation Sequencing analysis was performed on the peripheral blood of nine patients with hereditary hemorrhagic telangiectasia in four unrelated families. All patients were diagnosed with hereditary hemorrhagic telangiectasia according to the Curaçao criteria. Data on treatment and screenings of visceral involvement were recorded from files. Results: We have found a pathogenic variation in either the ENG or ACVRL1 gene in each family. Two novel pathogenic variations in the ENG gene, including NM_000118.3 (ENG): c.416delC (p.P139fs*24) and NM_000118.3(ENG): c.1139dupT (p.Leu380PhefsTer16), were found in the same family. The NM_000020.2(ACVRL1): c.1298C>T (p.Pro433Leu) pathogenic variation in the ACVRL1 gene in our first family and a novel heterozygous likely pathogenic NM_000020.2(ACVRL1): c.95T>C (p.Val32Ala) variation was found in our second family. Seven of the nine patients were treated with thalidomide for controlling bleeding episodes. All patients responded to thalidomide. In one patient, the response to thalidomide was lost and switched to bevacizumab. Conclusion: In hereditary hemorrhagic telangiectasia, certain types of mutations correlate with disease phenotypes and with next generation sequencing methods. New pathogenic variations can be revealed, which might help manage patients with hereditary hemorrhagic telangiectasia
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- 2020
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24. Comprehensive Genetic Analysis Results of TSC1/TSC2 Genes in Patients with Clinical Suspicion of Tuberous Sclerosis Complex and Definition of 3 Novel Variants.
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Demir, Selma, Yalçıntepe, Sinem, Atlı, Engin, Yalçın, Yelda, Atlı, Emine İkbal, Eker, Damla, Karal, Yasemin, and Gürkan, Hakan
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TUBEROUS sclerosis diagnosis ,DNA analysis ,ACQUISITION of data methodology ,SEQUENCE analysis ,CROSS-sectional method ,GENETIC polymorphisms ,GENETIC testing ,RETROSPECTIVE studies ,MEDICAL records ,TUBEROUS sclerosis ,NUCLEIC acid amplification techniques - Abstract
Background: Tuberous Sclerosis Complex is an autosomal dominant multi-system disorder with an incidence of about 1 in 6000 live births. Defects in either TSC1 (* 605284) or TSC2 (* 191092) genes encoding the components of the Tuberous Sclerosis Complex are responsible for the disease. Therefore, consideration of TSC1/TSC2 pathogenic variations is recommended in the updated diagnostic criteria of Tuberous Sclerosis Complex. Aims: To present the TSC1/TSC2 screening results of a mixed patient population as well as possible new variants in 23 cases from 20 different families who were referred to our Genetic Diseases Diagnosis Center with the signs and symptoms of Tuberous Sclerosis Complex. Study design: Retrospective, cross-sectional study. Methods: Germline TSC1/TSC2 variants were screened in DNA samples extracted from peripheral blood samples of 23 patients from 20 unrelated families using targeted high-throughput sequencing and multiplex ligation-dependent probe amplification methods. The variants identified were classified according to ACMG 2015 guidelines. Results: In total, 5 different pathogenic/likely pathogenic changes have been defined. All these pathogenic/likely pathogenic variants were located in the TSC2 gene. Three of the pathogenic/likely pathogenic variants were novel. Two patients who are twin sisters were found to have TSC2/PKD1 contiguous deletion syndrome. One of the 3 novel variants was a mosaic in-frame deletion. We did not identify any pathogenic variants of the TSC1 gene. Conclusion: The novelty of most of the variants found, including a mosaic likely pathogenic variant, and the presence of a large genomic rearrangement, supports the importance of a comprehensive approach in analyzing TSC1/TSC2 genes. Genetic diagnosis should be performed with caution, considering the possibility of mosaic variants with low allelic fractions. [ABSTRACT FROM AUTHOR]
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- 2021
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25. Chronic myeloid leukaemia after chemoradiotherapy for solid malignancies
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Baysal, Mehmet, primary, Ulutas, Gülcin, additional, Gokyer, Ali, additional, Umit, Elif, additional, Atli, EmineIkbal, additional, Kirkizlar, Onur, additional, Gürkan, Hakan, additional, and Demir, AhmetMuzaffer, additional
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- 2020
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26. Two Novel ENG Pathogenic Variations and Genotype-Phenotype Correlations in Hereditary Hemorrhagic Telangiectasia Patients
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Baysal, Mehmet, primary, Demir, Selma, additional, Ümit, Elif G., additional, Gürkan, Hakan, additional, Baş, Volkan, additional, Karaman Gülsaran, Sedanur, additional, Demirci, Ufuk, additional, Kırkızlar, Hakkı Onur, additional, and Demir, Ahmet Muzaffer, additional
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- 2019
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27. ECG Biometric Identification Method based on Parallel 2-D Convolutional Neural Networks
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HANILCI, Ayca, primary and GÜRKAN, Hakan, additional
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- 2019
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28. Investigation of Genes Associated With Atherosclerosis in Patients With Systemic Lupus Erythematosus.
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Balcı, Mehmet Ali, Atlı, Engin, and Gürkan, Hakan
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ATHEROSCLEROSIS risk factors ,CAROTID intima-media thickness ,ULTRASONIC imaging ,PHOTOSENSITIVITY disorders ,CARDIOVASCULAR diseases ,GENE expression ,RISK assessment ,SYSTEMIC lupus erythematosus ,PATH analysis (Statistics) ,ARTHRITIS ,THROMBOCYTOPENIA ,AUTOIMMUNE hemolytic anemia - Abstract
Objectives: In this study, we aimed to identify patients with systemic lupus erythematosus (SLE) who are genetically at risk for developing atherosclerosis. Patients and methods: Between November 2014 and May 2016, a total of 38 patients with SLE (36 females, 2 males; mean age: 37.6 years; range, 18 to 71 years) and 32 healthy females (mean age: 31.5 years; range, 19 to 54 years) were included in the study. Carotid intima-media thickness (CIMT) was measured using high-resolution B-mode ultrasonography. SurePrint G3 Human Gene Expression 8x60K Microarray kit was used in our study. Genes showing differences in expression between the groups were identified by using GeneSpring GX 10.0 program. Pathway analyses of gene expressions were performed using Ingenuity Pathways Analysis (IPA). Gene ontology analyses were performed using the Protein Analysis Through Evolutionary Relationships (PANTHER). Results: Clinical findings of SLE patients were mainly photosensitivity (71.1%), arthritis (63.2%), lupus nephritis (55.3%), thrombocytopenia (26.3%), and autoimmune hemolytic anemia (21.1%). A total of 155 genes showing expression level difference were detected between SLE patients and healthy controls. In molecular network analysis, 28.2% of all genes were found to be directly or indirectly associated with atherosclerosis and cardiovascular disease. Conclusion: In SLE patients, many genes are expressed differently from healthy individuals. Expression of these genes is important in the pathogenesis of SLE. Genes identified differently in gene expression analysis can help us to identify SLE patients at risk for atherosclerosis in the Turkish population. [ABSTRACT FROM AUTHOR]
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- 2021
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29. Modeling of Electrocardiogram Signals Using Predefined Signature and Envelope Vector Sets
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Yarman B Sıddık, Gürkan Hakan, and Güz Ümit
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Telecommunication ,TK5101-6720 ,Electronics ,TK7800-8360 - Abstract
A novel method is proposed to model ECG signals by means of "predefined signature and envelope vector sets (PSEVS)." On a frame basis, an ECG signal is reconstructed by multiplying three model parameters, namely, predefined signature vector ," "predefined envelope vector ," and frame-scaling coefficient (FSC). All the PSVs and PEVs are labeled and stored in their respective sets to describe the signal in the reconstruction process. In this case, an ECG signal frame is modeled by means of the members of these sets labeled with indices and and the frame-scaling coefficient, in the least mean square sense. The proposed method is assessed through the use of percentage root-mean-square difference (PRD) and visual inspection measures. Assessment results reveal that the proposed method provides significant data compression ratio (CR) with low-level PRD values while preserving diagnostic information. This fact significantly reduces the bandwidth of communication in telediagnosis operations.
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- 2007
30. A New Method to Represent Speech Signals Via Predefined Signature and Envelope Sequences
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Yarman Binboga Sıddık, Güz Ümit, and Gürkan Hakan
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Telecommunication ,TK5101-6720 ,Electronics ,TK7800-8360 - Abstract
A novel systematic procedure referred to as "SYMPES" to model speech signals is introduced. The structure of SYMPES is based on the creation of the so-called predefined "signature and envelope " sets. These sets are speaker and language independent. Once the speech signals are divided into frames with selected lengths, then each frame sequence is reconstructed by means of the mathematical form . In this representation, is called the gain factor, and are properly assigned from the predefined signature and envelope sets, respectively. Examples are given to exhibit the implementation of SYMPES. It is shown that for the same compression ratio or better, SYMPES yields considerably better speech quality over the commercially available coders such as G.726 (ADPCM) at 16 kbps and voice excited LPC-10E (FS1015) at kbps.
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- 2007
31. Chromosomal Changes in Patients with Multiple Myeloma (MM)
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ATLI, Emine İkbal, GÜRKAN, Hakan, TOZKIR, Hilmi, ÜMİT, Elif Gülsüm, DEMİR, Selma, YALÇINTEPE, Sinem, ATLI, Engin, and DEMİR, Ahmet Muzaffer
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Multipl myelom,genetik,kromozom ,Medicine ,Multipl myeloma,genetics,chromosomes ,Tıp - Abstract
MultiplMyelom (plazma hücreli myelom, myelomatozis veya Kahler hastalığı) kemikiliğinde monoklonal immünglobulin (M protein) yapan plazma hücrelerininkontrolsüz, klonal artışı ile karakterize kronik, progresif ve letal bir hastalıktır.Son 10 yılda özellikle genetikteki teknolojik gelişmeler sonucu, myelomabiyolojisinin ve tedavisinde dramatik ilerleme sağlanmıştır. Tablonun hücreselve moleküler detayının zenginleştirilmesiyle yeni girişim ve prensiplerinözellikle tedavide belirlenmesinde yol gösterici olmuştur. Hastalık prognozuhastalığı oluşturan hücrelerin, morfolojisi, biyolojisi, fonksiyonu ve genetiközellikleri gibi değişkenler tarafından belirlenir. Günümüzde, prognozbelirlenmesinde ve tedavi seçiminde genetik özellikler de dikkate alınmaktadır.MM‟nin gelişimi; mutasyonları, kromozomal translokasyonları ve belki de belirliviral enfeksiyonlar ile tetiklenen çeşitli genetik anormalliklerin etkisini deiçeren çok basamaklı bir olay olarak tanımlanmaktadır. Hastalığın ilerlemesiylekarmaşık genetik anomalilerin arttığı gözlenmiştir. Genetik değişimlerinsaptanmasının sadece klinik prognoz açısından değil aynı zamanda tedaviyealınacak cevabı belirleyip tedavi alternatiflerin seçiminde de yardımcı olacağıbelirtilmiştir., MultipleMyeloma (plasma cell myeloma, myelomatosis or Kahler's disease) is a chronic,progressive, and lethal disease characterized with plasma cells was increased uncontrolledthat produced monoclonal immunoglobulin (M protein) in bone marrow. In the last10 years, especially in genetics, technological developments have resulted indramatic progress in myeloma biology and treatment. Enrichment of cellular andmolecular details for disease has led to new initiatives and principles leadingto choice of treatment. The disease prognosis is determined by variables suchas the morphology, biology, function, and genetic characteristics of the cellsthat make up the disease. Nowadays, genetic features are taken into account indetermining prognosis and selection of treatment. Development of MM; is definedas a multi-step event triggered by mutations, chromosomal translocations,certain viral infections and possibly the effects of various geneticabnormalities. It has been observed that complex genetic anomalies increasewith the progression of the disease. Genetic changes will be helpful not onlyin terms of clinical prognosis but also in choosing therapeutic alternatives byanticipating the response to be taken from the treatment.
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- 2018
32. A novel lemd3 pathogenic variant in a son and mother with osteopoikilosis
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Elmaoğulları, Selin, primary, Yıldız, Adelet Elçin, additional, Demir, Selma, additional, Gürkan, Hakan, additional, and Uçaktürk, Seyit Ahmet, additional
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- 2019
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33. Evaluation of Invasive Prenatal Test Indications and Results at a Tertiary Center in the Thrace Region of Turkey
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İNAN, Cihan, primary, SAYIN, N. Cenk, additional, GÜRKAN, Hakan, additional, DOLGUN, Z. Nihal, additional, GÜRSOY ERZİNCAN, Selen, additional, UZUN, Işıl, additional, SÜTÇÜ, Havva, additional, and VAROL, Füsun, additional
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- 2019
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34. Wiedemann-Steiner Syndrome as a Differential Diagnosis of Cornelia de Lange Syndrome Using Targeted Next-Generation Sequencing: A Case Report.
- Author
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Demir, Selma, Gürkan, Hakan, Öz, Veysel, Yalçıntepe, Sinem, Atlı, Emine İ., and Atlı, Engin
- Published
- 2021
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- View/download PDF
35. TRAKYA BÖLGESİ ERKEK İNFERTİLİTE OLGULARINDA Y KROMOZOM MİKRODELESYONLARI VE SİTOGENETİK ANOMALİLERİN SIKLIĞI: TEK MERKEZ DENEYİMİ.
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YALÇINTEPE, Sinem, EKER, Damla, and GÜRKAN, Hakan
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Y chromosome ,CHROMOSOME analysis ,KLINEFELTER'S syndrome ,MEDICAL genetics ,MALE infertility ,INFERTILITY - Abstract
Copyright of Journal of Istanbul Faculty of Medicine / İstanbul Tıp Fakültesi Dergisi is the property of Istanbul Tip Fakultesi Dergisi and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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- 2021
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36. Chromosomal Microarray Analysis in Turkish Patients with Unexplained Developmental Delay and Intellectual Developmental Disorders.
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GÜRKAN, Hakan, ATLI, Emine İkbal, ATLI, Engin, BOZATLI, Leyla, ALTAY, Mengühan ARAZ, YALÇINTEPE, Sinem, ÖZEN, Yasemin, EKER, Damla, AKURUT, Çisem, DEMİR, Selma, and GÖRKER, Işık
- Subjects
- *
CHROMOSOME analysis , *CHROMOSOME abnormalities , *DEVELOPMENTAL disabilities , *PEOPLE with intellectual disabilities , *GENOMICS , *MICROARRAY technology - Abstract
Introduction: Aneuploids, copy number variations (CNVs), and single nucleotide variants in specific genes are the main genetic causes of developmental delay (DD) and intellectual disability disorder (IDD). These genetic changes can be detected using chromosome analysis, chromosomal microarray (CMA), and next-generation DNA sequencing techniques. Therefore; In this study, we aimed to investigate the importance of CMA in determining the genomic etiology of unexplained DD and IDD in 123 patients. Method: For 123 patients, chromosome analysis, DNA fragment analysis and microarray were performed. Conventional G-band karyotype analysis from peripheral blood was performed as part of the initial screening tests. FMR1 gene CGG repeat number and methylation analysis were carried out to exclude fragile X syndrome. Results: CMA analysis was performed in 123 unexplained IDD/DD patients with normal karyotypes and fragile X screening, which were evaluated by conventional cytogenetics. Forty-four CNVs were detected in 39 (39/123=31.7%) patients. Twelve CNV variant of unknown significance (VUS) (9.75%) patients and 7 CNV benign (5.69%) patients were reported. In 6 patients, one or more pathogenic CNVs were determined. Therefore, the diagnostic efficiency of CMA was found to be 31.7% (39/123). Conclusion: Today, genetic analysis is still not part of the routine in the evaluation of IDD patients who present to psychiatry clinics. A genetic diagnosis from CMA can eliminate genetic question marks and thus alter the clinical management of patients. Approximately one-third of the positive CMA findings are clinically intervenable. However, the emergence of CNVs as important risk factors for multiple disorders increases the need for individuals with comorbid neurodevelopmental conditions to be the priority where the CMA test is recommended. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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37. KRAS Mutation in Small Cell Lung Carcinoma and Extrapulmonary Small Cell Cancer
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Kodaz, Hilmi, Taştekin, Ebru, Erdoğan, Bülent, Hacıbekiroğlu, İlhan, Tozkır, Hilmi, Gürkan, Hakan, and Çiçin, İrfan
- Subjects
neoplasms ,digestive system diseases ,humanities ,respiratory tract diseases ,Cerrahi - Abstract
Background: Lung cancer is one of the most lethal cancers. It is mainly classified into 2 groups: non-small cell lung can-cer (NSCLC) and small cell lung cancer (SCLC). Extrapul-monary small cell carcinomas (EPSCC) are very rare. The Ras oncogene controls most of the cellular functions in the cell. Overall, 21.6% of human cancers contain a Kirsten Ras (KRAS) mutation. SCLC and EPSCC have several similar features but their clinical course is different.Aims: We investigated the KRAS mutation status in SCLC and EPSCC.Study design: Mutation research.Methods: Thirty-seven SCLC and 15 EPSCC patients were included in the study. The pathological diagnoses were confirmed by a second pathologist. KRAS analysis was performed in our medical genetic department. DNA isola-tion was performed with primary tumor tissue using the QIAamp DNA FFPE Tissue kit (Qiagen; Hilden, Germany) in all patients. The therascreen KRAS Pyro Kit 24 V1 (Qia-gen; Hilden, Germany) was used for KRAS analyses. Results: Thirty-four (91.9%) of the SCLC patients were male, while 11 (73.3%) of the EPSCC l patients were fe-male. SCLC was more common in males, and EPSCC in females (p=0.001). A KRAS mutation was found in 6 (16.2%) if SCLC patients. The most common mutation was Q61R (CAA>CGA). Among the 15 EPSCC patients, 2 had a KRAS mutation (13.3%). When KRAS mutant and wild type patients were compared in the SCLC group, no differ-ence was found for overall survival (p=0.6).Conclusion: In previous studies, the incidence of KRAS mutation in SCLC was 1-3%; however, it was 16.2% in our study. Therefore, there may be ethnic and geographical differences in the KRAS mutations of SCLC. As a result, KRAS mutation should not be excluded in SCLC
- Published
- 2016
38. Lack of Association Between Toll-like Receptor 2 Polymorphisms (R753Q and A-16934T) and Atopic Dermatitis in Children from Thrace Region of Turkey
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Can, Ceren, primary, Yazıcıoğlu, Mehtap, additional, Gürkan, Hakan, additional, Tozkır, Hilmi, additional, Görgülü, Adnan, additional, and Süt, Necdet Hilmi, additional
- Published
- 2017
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39. New Generation Treatments for Epilepsis.
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Gürkan, Hakan
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- *
EPILEPSY , *NEUROPEPTIDE Y , *BRAIN diseases , *JUJUBE (Plant) , *GENE expression , *GENE therapy - Abstract
Epilepsy is a disease historically associated with evil spirits and mystery. The long history of epilepsy dates back to a 4000-year-old Akkadian tablet found in Mesopotamia; It depicts a person "with his neck turned to the left, his hands and feet tense, his eyes wide open, and foam flowing from his mouth without him realizing it". About a thousand years later, Late Babylonians wrote a diagnostic manual called Sakikku, which included texts describing epilepsy. Documentation on epilepsy also dates back to about B.C. It is also found in Chinese texts dated to 770-221. A group of physicians published the Yellow Emperor's Classic of Internal Medicine, the Huang Di Nei Ching, which outlined generalized seizures. The spiritually based pathophysiology of epilepsy dates back to 3000 BC, when the Hippocratic School in Greece suggested that the brain might be the root cause of epilepsy. It remained largely unchallenged until the 5th century. Aristotle, an important philosopher of the 4th century BC, suggested that epilepsy and sleep arise from similar mechanisms. The Hippocratic idea that epilepsy was a brain disease finally gained traction in Europe from the 17th century onwards and continued throughout the millennium. Samuel Tissot (1728-1797), a prominent Swiss physician, published Traité de l'épilepsie in 1770. John Hughlings Jackson (1835-1911) laid the scientific foundation of epileptology and studied the localization of lesions that could cause seizures. He published the influential text "The Study of Convulsion", which was the culmination of his scientific findings. The current focus of gene therapy strategies for epilepsy is primarily on neuropeptide Y, galanin, etc. It aims to reduce neuronal excitability through overexpression of neuromodulatory peptides, such as, or through genetic modification of astrocytes, for example, to suppress adenosine kinase expression. [ABSTRACT FROM AUTHOR]
- Published
- 2024
40. P-06 Catecholamine-induced cardiomyopathy: A rare presentiation of pheochromocytoma.
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Bağır, Gülay Şimşek, Haydardedeoğlu, Fi̇li̇z, Bakiner, Okan, Yabanoğlu, Hakan, Torun, Neşe, Koçer, Emrah, Gürkan, Hakan, and Ertörer, Melek Eda
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ADRENAL tumors ,CORONARY vasospasm ,HEART valve diseases ,PHEOCHROMOCYTOMA ,CARDIOMYOPATHIES ,SYMPTOMS - Abstract
Introduction: Pheochromocytoma and paraganglioma (PPGL) are rare neuroendocrine tumors. Clinical manifestations consist of various cardiovascular signs and symptoms related to excessive secretion of catecholamines. Catecholamine-induced cardiomyopathy is a rare but life-threatening complication of PPGL. Excessive discharge of catecholamines results in vasoconstriction, coronary vasospasm and myocardial ischemia. Three types of cardiomyopathies can be observed in patients with PPGL; dilated cardiomyopathy, Takotsuba cardiomyopathy and hypertrophic cardiomyopathy. Clinical Case: Herein, we present a case with PPGL complicated with heart failure probably due to excessive secretion of catecholamines. A 19 years-old man was admitted to emergency department with dyspnea and hypotension. He exhibited severe signs of heart failure with very high liver function tests; ALT: 3647 U/L (8-65) and AST: 4542U/L (7-40), probably due to hepatic congestion. Echocardiogram performed in ICU reported %10 left venticular ejection fraction with diffuse akinesia. Remarkable improvement of liver function was recorded following the introduction of heart failure medicines. A computed tomography scan that was performed for abdominal pain and distension revealed a six cm tumour at the left adrenal gland compatible with pheochromocytoma. Laboratory analyses were; 24-hour urine metanephrines: 1938mcg (44-261), normetanephrines: 17934mcg (103-390). Following necessary preoperative preparations, laparoscopic left adrenalectomy was performed and a 70 mm adrenal tumor, histopathologically compatible with pheochromocytoma, was excised. His postoperative laboratory findings were; 24-hour urine metanephrines: 248 mcg (44-261), normetanephrines: 4368 mcg (103-390), chromogranin A: 554.9 ng/ml (0-100), 3-methoxytyramine: 0.34 nmol/l (0-0.17). A 68-Ga-DOTA-Peptide PET/CT following 12 weeks of surgery demonstrated hypermetabolic lesions at left suprarenal area. A second open surgery was performed and lymph node metastases were detected (Figure 1). His cardiac functions ameliorated significantly following the removal of tumors. Genetic analysis for PPGL syndromes were negative for KIF1B, SDHB, NTRK1, TMEME127, VHL, RET, SDHD genes. Work-up is still pending for the mutations of SDHA, SDHC and SDHAF2 genes. Conclusion: Cathecolamine-induced cardiomyopathy is a rare entity associated with PPGL. Urgent recognition of related clinical signs and symptoms and detection of PPGL is lifesaving. It should be kept in mind in patients presenting with symptoms of heart failure, hypotension and multisystem crisis in the absence of coronary or valvular heart disease. Figure 1. Pheochromocytoma with lymph node metastasis. (H&E x100) [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
41. Trakya Populasyonundaki Ailevi Akdeniz Ateşi Hastalarında MEFV Geni Ekson 2 Ve Ekson 10 Gen Bölgesi Mutasyonları
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GÜRKAN, Hakan, ÖZKAYIN, Emine Neşe, TABAKÇIOĞLU, Kıymet, and ALGÜNEŞ, Çetin
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Ailevi Akdeniz Ateşi,DNA dizi analizi,mutasyon,tek nükleotid değişimi ,Familial Mediterranean Fever ,DNA sequencing ,mutations ,single-nucleotide polymorphisms - Abstract
Objectives: The objective of the study is to explore the MEFV gene exon 2 and exon 10 gene region mutations which take place in etiopathogenesis of Familial Mediterranean Fever in the Thrace population with the DNA sequence analysis method and to compare the results with the other studies. Patients and Methods: The study included patients with Familial Mediterranean Fever who have no relative relationship, have the same linguistic characteristic and live in the Thrace region for at least three generations (34 females, 34 males). MEFV gene exon 2 and exon 10 gene regions multiplied with PCR and their nucleotids were determined with the DNA sequence analysis method. Results: G442C, T306C, A414G, C495A, G605A SNPs were found in MEFV gene exon 2 gene region and G2040C, A2080G, G2082A, A2084G, T2177C, G2282A SNPs were found in MEFV gene exon 10 gene region in the Thrace population. Conclusion: The T306C, A414G, C495A, G605 single-nucleotide polymorphisms in MEFV gene exon 2 gene region and the mutations in exon 10 gene region are not compatible in terms of their frequencies with the results of the other studies. Amaç: Çalışmamızın amacı Trakya populasyonunda Ailevi Akdeniz Ateşi etyopatogenezinde yer alan MEFV geni ekson 2 ve ekson 10 gen bölgesi mutasyonlarının otomatize DNA dizi analizi metodu ile araştırılarak elde edilen sonuçların literatürdeki diğer çalışmalar ile karşılaştırılmasıdır. Hastalar ve Yöntemler: Çalışmaya Ailevi Akdeniz Ateşi tanılı hastalardan, birbirileri ile akrabalık ilişkisi bulunmayan, aynı karakteristik dil özellikleri gösteren ve en az üç kuşaktır Trakya Bölgesi'nde yaşayanlar (34 kadın, 34 erkek) dahil edildi. MEFV geni ekson 2 ve ekson 10 gen bölgeleri polimeraz zincir tepkimesi ile çoğaltılarak, otomatize DNA dizi analizi metodu ile nükleotid dizileri belirlendi. Bulgular: Trakya populasyonunda MEFV geni ekson 2 gen bölgesinde G442C, T306C, A414G, C495A, G605A, ekson 10 gen bölgesinde G2040C, A2080G, G2082A, A2084G, T2177C, G2282A tek nükleotid değişimleri belirlendi. Sonuç: Çalışmamızın sonuçları MEFV geni ekson 2 gen bölgesinde belirlediğimiz T306C, A414G, C495A, G605 tek nükleotid değişiklikleri ve ekson 10 gen bölgesinde belirlediğimiz mutasyonların sıklıkları açısından literatür ile farklılıklar göstermektedir.
- Published
- 2014
42. Investigation of Copy Number Variation by arrayCGH in Turkish Children and Adolescents Diagnosed with Autism Spectrum Disorders.
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Görker, Işık, Gürkan, Hakan, Ulusal, Selma, Atli, Engin, Ayaz, Güçlü, Ceylan, Cansın, Tozkir, Hilmi, Araz Altay, Mengühan, Erol, Ali, Yildiz, Nazike, Direk, Ceren, Akköprü, Hilal, Kilit, Neriman, Aykutlu, Hasan Cem, Bozatli, Leyla, Çelik, Zeki, and Berberoğlu, Kıvanç Kudret
- Subjects
- *
DIAGNOSIS of autism , *GENETICS , *KARYOTYPES , *NUCLEIC acid hybridization - Abstract
Aim: The development of whole-genome screening methodologies for the detection of copy number variations (CNVs), such as array-based comparative genomic hybridization (aCHG), provides a much higher resolution than karyotyping leading to the identification of novel microdeletion and microduplication syndromes often associated with an autism spectrum disease (ASD) phenotype. The aim of the study was to determine CNVs of patients with ASD by using array-based comparative genomic hybridization. Methods: Fifty-three patients diagnosed with ASD between 20.01.2014 and 14.01.2015 were included in the study. Chromosome analysis of the patients was performed from peripheral blood cultures and analysed as normal. All patients were evaluated with P064C1 and P096A2 MLPA probes in terms of 16 mental retardation related syndromes. For aCGH method, SurePrint G3 Human microarrays 8x60K were used with genomic DNA isolated from peripheral blood. Results: According to results of 53 patients who were included in and performed with arrayCGH, 8 (15%) patients had CNVs classified as pathogenic or variant of unknown significance (VOUS) in the study. We detected a pathogenic NRXN1 gene partial CNV deletion (2p16.3) in two patients. Also we identified a 900 kb duplication of 4p15.31 including SLIT2 gene, and a 245 kb duplication of 15q11.2 including PWRN1 gene in one patient. Our other findings are considered to be a variant of unknown significance (VOUS). Conclusion: The results of the study support the literature knowledge, where the copy number variations that cannot be detected with conventional cytogenetics methods in terms of size may happen in patients with ASD. [ABSTRACT FROM AUTHOR]
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- 2018
- Full Text
- View/download PDF
43. Azoospermik infertil erkek hastalarda sinaptonemal kompleks protein 3 (SCP3) genindeki mutasyonların dna dizi analizi yöntemi ile araştırılması
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Gürkan, Hakan, Aydın, Filiz, and Tıbbi Biyoloji Anabilim Dalı
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Y chromosome ,Urology ,Infertility ,Üroloji ,Genetics ,Microdeletion ,DNA ,DNA analysis ,Genetik ,Synaptonemal complex ,Polymorphism-genetic ,Medical Biology ,Tıbbi Biyoloji - Abstract
İnfertilite insan popülasyonunda çiftlerin yaklaşık olarak % 10- 25'ini etkileyen bir üreme sağlığı sorunudur. Erkek faktörü, infertil çiftlerin yaklaşık % 50'sinde önemli rol oynar. Erkek faktörü infertilitesinin temel nedeni olguların yaklaşık olarak % 30-40'ında bilinmemekle birlikte özellikle nonobstrüktif azoospermide, genetik kusurların güçlü bir role sahip olduğuna inanılmaktadır.Spermatogenez sürecinde meydana gelen mayoz bölünmedeki hatalar, azoospermiye neden olan önemli bir sebeptir. Mayotik profaz I'de homolog kromozomlar arasındaki rekombinasyona, Sinaptonemal Kompleks (SC) adında üçlü bir yapı aracılık eder. SCP3 geni null mutasyonu için homozigot (Scp3-/-) olan erkek farelerde spermatogenez, aksiyal veya lateral eleman yapılarının gelişmemesi nedeni ile mayotik profaz I'in zigoten/pakiten evresinde durur ve ağır apoptotik hücre ölümünün bir sonucu olarak infertildirler.Çalışmanın amacı Türk toplumundaki non-obstruktif azoospermik infertil erkeklerde SCP3 genindeki olası mutasyonların ve/veya tek nükleotid polimorfizmlerinin araştırılmasıdır.Çalışmaya 531 infertil erkek hastadan spermiyogram sonucu Dünya Sağlık Örgütü kriterlerine göre azoospermi olan, 46,XY kromozom yapısına sahip, Y kromozom mikrodelesyonu taşımayan, birbirileri ile akrabalık ilişkisi bulunmayan 75 infertil erkek hasta ve fertilitesi doğurganlık ile kanıtlanmış 75 kontrol dahil edildi.SCP3 genine ait 9 ekson intron bölgeleri içerisinde yer alan sentetik oligonükleotid dizileri tasarlanarak PZR ile çoğaltıldı ve otomatize DNA dizi analizi yöntemi ile nükleotid dizileri belirlendi.Çalışmada SCP3 genine ait 9 eksonda mutasyon saptanmadı. Bununla birlikte NCBI SNP veri tabanında tanımlanmış yedi, tanımlanmamış dört varyasyon saptadık.Sonuç olarak, SCP3 mutasyonlarının çalışma popülasyonumuzda non obsturiktif azoospermik infertil erkek hastalarda mayotik duraksama için genetik yatkınlıkla ilişkili olmadığı, SCP3 ile birlikte sinaptonemal kompleksin diğer bileşenlerinin de (SCP1, SCP2) araştırılması gerektiği öngörüsündeyiz. Infertility is a reproductive health problem affecting about 10-25% couples in human population. Male factor plays an important role in approximately 50% of couples. Although the main cause of male factor infertility is not known in 30-40% of the cases, genetic defects are believed to have significant effect particularly in non-obtstructive azoospermia.Errors in meiotic division during spermatogenesis are major causes resulting in azoospermia. A small tripartite structure called synaptonemal complex (SC) mediates the recombination between the homologous chromosomes in prophase I of meiosis. Spermatogenesis stops at the zygotene/pachytene stage of meiotic prophase I due to the undevelopment of axial or lateral element structures in male mice that are homozygous (Scp3-/-) for the null mutation of SCP3 gene and these mice are infertile as a result of massive apoptotic cell death.The purpose of the present study is to investigate the possible mutations and/or single nucleotide polymorphisms in SCP3 gene among non-obstructive azoospermic infertile males of Turkish population.Seventy-five infertile male patients out of 531 infertile males were included in the study according to the spermiograms in which azoospermia was diagnosed with respect to World Health Organization standarts. These 75 patients were unrelated to each other and had 46,XY chromosome structure without Y microdeletion. In addition 75 indivuduals whose fertility was proven by reproduction were enrolled into study as controls. Nine exon deep intronic primers belonging to SCP3 gene were designed and amplified by PCR and the nucleotide sequences were identified by automated DNA sequence analysis.We did not detect any mutations in 9 exons of SCP3. However, we detected 11 variations 7 of which are identified in NCBI SNP database whereas 4 are not.As a result, we agree with the idea that SCP3 mutations are not associated to genetic susceptibility for meiotic arrest in infertile male patients in our study population with non-obstructive azoospermia and that further studies investigating the other components of synaptonemal complex (SCP1, SCP2) in addition to SCP3 should be conducted. 107
- Published
- 2011
44. The role of free radicals in ethiopathogenesis of diseases
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Gürkan, Hakan
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biological effects ,pathological effects ,patolojik etkileri ,Free radicals ,biyolojik etkiler ,serbest radikaller - Abstract
Free radicals can be defined as atoms or molecules containing one or more unpaired electrons in their orbitals. Their formation occurs continuously in the cells as a consequence of both enzymatic and nonenzymatic reactions. It has been estimated that the average person has around 10000–20000 free radicals attacking each body cell each day. Some free radicals are good in that they enable your body to fight inflammation, kill bacteria, and control the tone of smooth muscles, which regulate the working of internal organs and blood vessels. On the other hand increased or uncontrolled free radical activity might combine with other factors to cause some diseases such as neurodegenerative diseases, heart disease, cancers etc. The balance between the production of free radicals and the antioxidant defences in the body has important health implications. Under the normal conditions the antioxidant defense system within the body can easily handle free radicals that are produced. If there are too many free radicals produced and too few antioxidants, this may cause chronic damage. The aim of this study is review the data on diseases which may be linked to free radicals in order to clarify the role of them in ethiopathogenesis of these diseases.
- Published
- 2008
45. Assesing Extension of Meeting System Performance in Information Technology in Defense and Aerospace Project
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Gürkan, Hakan and Denker, Ahmet
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Iterative Process ,Acquisition Management ,Requirement analysis ,Project management ,Software Economics - Abstract
The Ministry of Defense (MoD) spends hundreds of millions of dollars on software to support its infrastructure, operate its weapons and provide command, control, communications, computing, intelligence, surveillance, and reconnaissance (C4ISR) functions. These and other all new advanced systems have a common critical component is information technology. Defense and Aerospace environment is continuously striving to keep up with increasingly sophisticated Information Technology (IT) in order to remain effective in today-s dynamic and unpredictable threat environment. This makes it one of the largest and fastest growing expenses of Defense. Hundreds of millions of dollars spent a year on IT projects. But, too many of those millions are wasted on costly mistakes. Systems that do not work properly, new components that are not compatible with old once, trendily new applications that do not really satisfy defense needs or lost though poorly managed contracts. This paper investigates and compiles the effective strategies that aim to end exasperation with low returns and high cost of Information Technology Acquisition for defense; it tries to show how to maximize value while reducing time and expenditure., {"references":["IEEE/EIA 12207 Standard for Information Technology - Software Life\nCycle Processes or relevant International Standardization Organization\n(ISO) standards. They define a set of recommended development\nactivities and documentation alternatives for software intensive systems.","The Software Engineering Institute (SEI) Capability Maturity Model\n(CMM) for software development - Feb., 1993.","Barrow, Patrick D. M. and Mayhew, Pam J. \"Investigating principles of\nstakeholder evaluation in a modern IS development approach.\" Journal\nof Systems and Software 52, Iss. 2,3 (June 1, 2000): 95-103.","PMI, A Guide to the Project Management Body of Knowledge\n(PMBOK® Guide) First Edition Version 1.0 June 2003.","Pfleeger, Shari Lawrence, Software Engineering: Theory and Practice,\nUpper Saddle River: Prentice Hall, 2001.","Hall, Elaine, M. Managing Risk: Methods for Software System\nDevelopment, Boston: Addison-Wesley, 1998.","Housel, Thomas J. and Bell, Arthur H. Measuring and Managing\nKnowledge. McGraw-Hill Irwin, 2001.","Software Project Survival Guide, Requirements Development, Steven C.\nMcConnell, http://www.stevemcconnell.com/sgreq.htm","Ralph R. Young, Effective Requirements Practices, pp82-83, Addison-\nWesley, 2001\n[10] Malhotra, Yogesh. \"Knowledge Management for e-Business\nPerformance.\" Information Strategy: The Executives Journal (2000).\n[11] PBPG, 2002 Impronova AB, \" IT Procurement Best Practice Guide\",\n2002.\n[12] Joyce Fortune , Diana White \"Framing of project critical success factors\nby a systems model\" International Journal of Project Management,2005\n[13] Ahmet Denker, Hakan G├╝rkan \"Iterative Way to Acquire Information\nTechnology For Defense and Aerospace\", 7th International Conference\non Enformatika, Systems Sciences and Engineering,2005."]}
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- 2007
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46. Hava kuvvetlerinin ana savunma sistem tedarikinde proje yönetimi
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Gürkan, Hakan, Denker, Ahmet, and Elektronik Mühendisliği Anabilim Dalı
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Elektrik ve Elektronik Mühendisliği ,Defense and Defense Technologies ,Savunma ve Savunma Teknolojileri ,Computer Engineering and Computer Science and Control ,Electrical and Electronics Engineering ,Bilgisayar Mühendisliği Bilimleri-Bilgisayar ve Kontrol - Abstract
ÖZETDoktora TeziHAVA KUVVETLERİNİN ANA SAVUNMA SİSTEM TEDARİKİNDEPROJE YÖNETİMİHakan GÜRKANAnkara ÜniversitesiFen Bilimleri EnstitüsüElektronik Mühendisliği Anabilim DalıDanışman: Prof. Dr. Ahmet DENKERMilli Savunma Bakanlığı (MSB) silah sistemi veya silah sistemleri ile ilgili füze, elektronik harp,radar, komuta ve kontrol, istihbarat, izleme ve keşif amaçlı sistemleri işletmek ve yenilemek içinmilyonlarca dolar harcama yapmaktadır. Hava Kuvvetleri de birliklerini bu teknolojik yenilik vedeğişikliklere adapte edebilmek için modernizasyon çalışmaları için yeni teknolojiler tedarik etmekteve geliştirmektedir. Sözkonusu sistemlerin veya yeni sistemlerin kritik unsurunu yazılım yoğunluklusistemler oluşturmaktadır.Tedarik sürecinde yönetimsel, yasal ve kaynak gibi bazı zorluklarla karşılaşılmaktadır. Aynı zamandayeni bir proje geliştirmek büyük para kaynağı, zaman ve bilgi gerektirmektedir. Dolayısı ile benzerprojelerde hata olasılığı olabildiğince en alt seviyelere indirilmelidir. Literatür araştırmasıyla,projelerin kritik başarı faktörleri ve başarısızlığa neden olan faktörler saptanmıştır. Saptanan faktörleryardımıyla, bir anket hazırlanmış ve savunma sanayiinde görevli proje yöneticilerine gönderilmiştir.Anket sonuçlarının değerlendirilmesi sonucu, proje yönetiminde kritik başarı faktörleri ile projeuygulamalarında en sık karşılaşılan problemler ve ilgili problemlerin proje performanslarına olumsuzyönde etki düzeyleri saptanmıştır.Tez çalışmasında, proje yönetim ile yazılım yoğunluklu sistem tedariğinin temel prensipleriincelenmiş ve bazı yazılım tedariği süreci modelleri gözden geçirilerek birbirleriyle karşılaştırılmıştır.Aynı zamanda silahlı kuvvetlerde kullanılan yazılım yoğunluklu tedarik süreci ve ihtiyaçları gözönüne alınarak incelenmiştir. Sonuç olarak Hava Kuvvetlerine uluslararası başarısı kanıtlanmışmodellerin ve anket sonuçlarının ışığı altında, bir olgunluk model süreci önerilmiştir.2007, 206 sayfaAnahtar Kelimeler: Savunma sanayii, proje yönetimi, tedarik süreci, yazılım yoğunluklu sistem,anket formu.i ABSTRACTPh.D. ThesisPROJECT MANAGEMENT IN MAJOR DEFENCE SYSTEMS ACQUISITIONFOR TURKISH AIR FORCEHakan GÜRKANAnkara UniversityGraduate School of Natural and Applied SciencesDepartment of Electronic EngineeringSupervisor: Prof. Dr. Ahmet DENKERThe Ministry of Defense (MoD) spends hundreds of millions of dollars on systems to support itsinfrastructure, to operate its weapons and electronic warfare systems, and to provide command,control, communications, computing, intelligence, surveillance, and reconnaissance (C4ISR)functions. At the hearth of these systems, there is software intensive system which operates andmanages them. In the light of these technological facts, Turkish Air Forces (TAF) is bound tomodernize its units to adapt the new technologies. In this scope new technologies are acquired andhas to be developed.During acquisition process TAF encounter some difficulties involving management, legal, resourceissues. At the same time developing a new project entails a major amount of financial resource andtime. So the error rate of these projects must be minimized. Not only the critical success factors butalso the factors causing time slippage and budget overruns are determined through a literature review.Survey questionnaires are prepared by those findings and conducted through project managers indefense sector. Analyzing those returns, the critical success factors in major defense systems areevaluated and the most frequently encountered problems and their negative impact on projectperformance are determined.In this study, the main principles of the software-intensive system acquisition process and projectmanagement methods are reviewed. Some software acquisition process models are discussed andcompared with each other. The existing system which is used by TAF for acquiring software intensivesystems is studied, especially in the light of its needs. Eventually, a maturity model approach foracquisition in the light of survey results and approved international models, successes of which havebeen proven, is proposed.2007, 206 pagesKey Words: Defense industry, project management, acquisition process, software intensive systems,questionnary form.ii 216
- Published
- 2007
47. Major depresyon olgularında norepinefrin transfer geni polimorfizmleri sıklığı
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Gürkan, Hakan, Bozkurt, Gökay, and Tıbbi Biyoloji Anabilim Dalı
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Medical Biology ,Tıbbi Biyoloji - Abstract
ÖZETMajör Depresif Bozukluk en az bir Majör Depresif Evre ile tanımlanır; ki bu,hastanın aşağıdaki semptomların en az dördüne ek olarak depresif ruh halinin ve/veyaanhedonisinin olduğu iki haftalık bir düşük fonksiyon dönemidir. Bu semptomlar: 1-belirgin kilo değişimi (vücut ağırlığının %5'i kadar kayıp ya da alım), 2- insomni(uykusuzluk) ya da hipersomni (uyanık kalamama), 3- psikomotor ajitasyon ya daretardasyon, 4- yorgunluk, 5- değersizlik ya da suçluluk hisleri, 6- azalmışkonsantrasyon/dikkat, 7- tekrarlayan ölüm ya da intihar düşünceleri.Majör depresif bozukluk önemli prevalans ve morbiditeye sahip bir bozukluktur.Bunun kalıtımsal bir bozukluk olduğu açıktır ve genetik etkiler bu hastalığa duyarlılığa%30-50 kadar katkı sağlıyor gözükmektedir. Bu bariz genetik role rağmen, altta yatanpatofizyoloji açıkça heterojendir. Nöral gelişim, genler ve çevre arasındaki etkileşim,majör depresyonu gen ve çevre arasında etkileşimin paylaşıldığı en güzel örnekbozukluklardan biri haline getirmektedir. Genetik eğilim ve çevresel streslerin birkombinasyonu SSS'de, afektif duyarlılığın altında yatanlara benzer nitelikte değişikliklereyol açar. Bugüne kadarki aday gen çalışmaları, serotonin geri alım taşıyıcısındapolimorfizmlerin olası üstün rolünü ortaya koyarlar. Bu polimorfizimler depresyonaduyarlılığı artıran kişilik özellikleri ve çevresel tahriklere bağlı intihar riskini artırabilir.Hayvan modelleri, hem 5-HT sistemi hem de CRF sistemindeki anomalilerin anksiyöz vedepresif semptomatoloji riskini artırıcı rolünü destekler. Hayvan modelleri ve insangörüntülemesi ile limbik subkortikal yapılar ile dorsal-ventral prefrontal kortikaletkileşimleri içeren nöral devreler aydınlatılmaktadır. Dahası, beyinsapı monoaminnöronal devresinin bu sistemleri nasıl ayarlayabildiğinin modeli de yavaş yavaş açıklığakavuşturulmaktadır.111Bugüne kadar majör depresyon için bir genetik locus araştıran, yayımlanmış, tekbağlantı ve ilişkilendirme çalışması nispeten az sayıda aday gen kullanmıştır. Gelecekte,genom çapında tarama ile gerçekleştirilecek nötr-hipotez bağlantı çalışmaları,depresyonun genetik çeşitliliğinin altında yatan yeni genetik locusların tanımlanmasınaolanak tanıyacaktır. Depresyona duyarlılığı artıran nicel özelliklerin daha iyi anlaşılması,bu tarz bağlantı çalışmalarında ilerleme kaydedilmesi açısından kritik olacaktır. Ek olarak,transjenik kemirgenlerde mikro-PET uygulamalarının ilerletilmesi, yakında gen-çevreetkileşiminin görüntülenmesini mümkün kılacaktır. Dolayısıyla yakında, depresyonaduyarlılığın genetik mekanizmalarına, bu genlerin transjenik modellerdeki rolüne veafektif cevabın altında yatan, bu genlerin nöral devrelerdeki rolüne ulaşmak mümkünolacaktır.Çalışmamızda, majör depresyonla NET geninin iki bilinen dizilim varyantıarasında allelik ilişki olup olmadığını anlamaya çalıştık. Bir polimorfizm sık ortaya çıkansessiz 1287 G/A (Exon 9) mutasyonu ve diğeri yine sessiz 1398 G/A (İntron 9)mutasyonuydu. 1287G/A polimorfizmini NET geninin kodlanma alanında (exon 9)yerleşimli, yüksek dağılım frekanslı tek gen olduğu için NET geni ve majör depresyonarasındaki ilişkiyi belirlemek için seçtik.Çalışmaya toplam 49 birbirleri ile akraba olmayan hasta ve 49 aynı ırklardan,normal, akraba olmayan kontrol dahil edildi. Tüm kontroller ve hastalar beyaz ırktandı(Caucasian). Hastalar Trakya Üniversitesi Tıp Fakültesi Hastanesi Psikiyatri Birimi'ndenseçildi ve DSM-IV kriterlerine göre rekürren majör depresyon tanısı almışlardı. SadeceHamilton'un Depresyon için Derecelendirme Skalası'ndan (HAMD, 17 maddelik) en az18 skor alan denekler çalışmaya dahil edildi. Tüm hastaların şizofreni dahil hiç 1. ve 2.eksen tanıları yoktu.Bizim sonuçlarımız 1287 G/A NE taşıyıcı polimorfik varyantının majördepresyonun genetiğinde belirgin bir rol oynamadığını ortaya koyar ama mevcutçalışmanın örneklem boyutu küçük çaplarda etkileri saptayacak mevcut güçteolmadığından genetik sorumluluğa minör katkıları dışlamaz.Bu tarz çalışmalar depresif semptomatolojinin ve majör depresyonpatofizyolojisinin anlaşılırlığını artıracak, aynı zamanda bu çaptan düşürücü bozukluklariçin mevcut tedavi seçeneklerini çoğaltacaktır.Anahtar Kelimeler: Major Depresyon, Norepinefrin Transfer Geni, DNA Dizi Analizi,Denatüre Edici Gradient Jel Elektroforezi112 FREQUENCY OF NOREPINEPHRINE TRANSPORTER GENEPOLYMORPHISMS IN MAJOR DEPRESSIONSUMMARYMajor Depressive Disorder is defined by at least one Major Depressive Episode,which is a two week period of decreased functioning in which the patient has eitherdepressed mood and / or anhedonia, in addition to at least four of the followingsymptoms: i) significant weight change (loss or gain of 5 % body weight), ii) insomnia orhypersomnia, iii) psychomotor agitation or retardation, iv) fatigue, v) feelings ofworthlessness or guilt, vi) decreased concentration / attention, vii) recurrent thoughts ofdeath or suicidality.Major depressive disorder is a disorder of significant prevalence and morbidity. Itis clearly a heritable disorder, and genetic influences appear to account for 30-50 % of thevulnerability for this disorder. Despite this evident genetic role, the underlyingpathophysiology is clearly heterogeneous. The interaction between neural development,genes and environment render major depression one of the quintessential disorders ofshared interaction between gene and environment. A combination of geneticpredisposition and environmental stress appear to lead to similar alterations in the CNSsystems that underlie affective responsiveness. Candidate gene studies to date suggest apotentially preeminent role of polymorphisms within the serotonin reuptake transporter.These polymorphisms may increase the risk of personality traits that increasevulnerability to depression and suicide to environmental insults. Animal models support arole for abnormalities of both the 5-HT system and the CRF system in increasing risk ofanxiety and depressive symptomatology. Through animal models and human imaging, theneural circuitry involving dorsal and ventral prefrontal cortical interactions with limbicsubcortical structures is being elucidated. Furthermore, a model of how brainstemmonoamine neuronal circuitry may modulate these systems is beginning to be clarified.113To date, the only linkage and association studies that have been publishedinvestigating genetic loci for major depression have used a relatively small number ofcandidate genes. Future hypothesisneutral linkage studies performed with genome-widescans will allow for identification of novel genetic loci that underlie the genetic varianceof depression. A better understanding of the quantitative traits that increase vulnerabilityto depression will be critical for progress in such linkage studies. Thus it will soon bepossible to approach the genetic mechanisms of vulnerability to depression, the role ofthese genes in transgenic models, and the roles of these genes in the neural circuits thatunderlie affective response.In our study, we endeavored to determine if an allelic association exists betweentwo of these known sequence variants of the NET gene and major depression. Onepolymorphism was a frequently occurring silent 1287 G/A (Exon 9) mutation and theother silent 1398 G/A (Intron 9) mutation. We chose the 1287 G/A polymorphism todetermine an association between the NET gene and major depression since it is the onlypolymorphism in the NET gene with higher frequency distribution located in the codingregion (Exon 9).A total of 49 unrelated patients and 49 race-matched normal unrelated controlswere included in the study. All controls and patients were Caucasian. Patients wereselected from the Trakya Universty Medical Hospital Psychiatry Unit and diagnosed ashaving major depression recurrent according to the DSM-IV criteria. Only subjects with aminimum score of 18 on the Hamilton Rating Scale for Depression (HAMD, 17 items)were included in this study. All patients were free of any other axis I or axis II diagnosisincluding schizophrenia.Our results suggest that the 1287G/A norepinephrine transporter polymorphicvariant does not play a significant role in the genetics of major depression, but do notexclude a minor contribution to the genetic liability since the sample size of the presentstudy does not provide statistical power to detect differences of small effect size.These types of studies will further the understanding of depressivesymptomatology and the pathophysiology of major depression, as well as enhancetreatment options for these debilitating disorders.Keywords: Major Depression, Norepınephrıne Transporter Gene, DNA Sequencing,Denaturing Gradient Gel Electrophoresis114 182
- Published
- 2006
48. Optimal kontrol sistemlerinin incelenmesi
- Author
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Gürkan, Hakan, Abilov, Abdulrıza, and Diğer
- Subjects
Optimization ,Elektrik ve Elektronik Mühendisliği ,Optimum control ,Electrical and Electronics Engineering - Abstract
ÖZET Yüksek Lisans Tezi OPTİMAL KONTROL SİSTEMLERİN İNCELENMESİ Hakan GÜRKAN Ankara Üniversitesi Fen Bilimleri Enstitüsü Elektronik Mühendisliği Anabilim Dalı Danışman : Prof. Dr. Abdulrıza ABİLOV Bu çalışmada, kontrol problemlerine sürecin ekonomik etkinliğini temin eden kriterlerden birinin veya birkaçının teknolojik sınır şartları dahilinde optimum değerlerinin bulunması ve saklanması amaç edilmiştir. İlk olarak, optimal kontrol için optimizasyon probleminin standart bir formda ortaya çıktığını farz etmek bize yardımcı olacağından, çoğu optimizasyon problemi için standart formu olan fiziksel süreç modeli, amaçlı fonksiyon, durum ve kontrol değişkenlerinin sınırlamaları açıklanmıştır. Sınırlama aralığındaki modelin optimum hesaplama yöntemi kullanarak, optimum problemlerinin çözülmesinde mümkün olan bütün değişiklerden en iyisini seçmek imkanı verir. Optimum parametrelerinin belirlenmesinde çok ölçümlü optimizasyon algoritmalarından yararlanılmıştır. Bu yöntemlerden öne sürülen problem için en uygunun seçilmesinde amaçlı fonksiyonun hiper yüzeyinin topoloji özelliklerinin belirlenmesi büyük önem taşır. Bu algoritmaların çoğu gradyant yöntemleri temelinde gerçekleştirilmiştir. Bir füze güdüm sistemi ile ilişkili birimler ve füze güdüm sistemlerinin algoritmik yapısı yanında, füze güdüm sistemlerini fiziksel olarak oluşturan yapılar da anlatılmaya çalışılmış, güdüm yöntemlerinin temel yapısını oluşturan evleme güdüm yöntemleri ele alınmıştır. Noktasal bir parçacık olarak alınmış nesneler için tanımlanmış çeşitli füze güdüm yöntemleri incelenmiş ve oransal seyir güdüm yöntemi belirli koşullar altında zaman gecikmeli sürekli optimal güdüm için işletilmiştir. 2000, 90 sayfa ANAHTAR KELİMELER optimal kontrol algoritmaları, optimizasyon, optimal füze güdümü III ABSTRACT INVESTIGATION OF OPTIMAL CONTROL SYSTEMS Master of Science Thesis Hakan GÜRKAN Ankara University Graduate School of Natural and Applied Sciences Department of Electronic Engineering Supervisor: Prof.Dr-Abdulrıza ABİLOV In this study, it was aimed to find and keep one or more optimal values of criterion providing economical effectively for the control problems in the technological boundary conditions. At first, since it would be useful to suppose that optimization problems arise in a standard form, the restrictions of physical process model which is the standard form for most optimization problems, objective function, case and control variables were explained. Using the optimal calculation methods of our model, which is in the space of restrictions, gives us the opportunity to select the best of all the variables possible in solving the optimum problems. Multi-measurement optimization algorithms were benefited from in determining the optimal parameters. It is of great importance to determine the topological features of hyper surface of objective function in choosing the most appropriate one of these methods for the problem offered. Most of these algorithms were realized on the basis of gradient methods. In addition to the algorithmic structure of units connected with a missile guidance system, the structures forming guidance systems physically were also tried to be explained, homing guidance methods constituting the basic structure of guidance systems were dealt with. Continuous time-delay controlled optimal guidance problem was analysed. The optimal guidance problem, following and able to practice fixed maneauvers, measuring the related position and its velocity continuously and capable of controlling its own acceleration in the face of pure time delay given was analysed. 2000, 90 Pages KEY WORDS: optimal control algorithm, optimization, optimal missile guidance, missile guidance methods^imulation IV 90
- Published
- 2000
49. Akım taşıyıcı eleman kullanılarak SC aktif filtre tasarımı
- Author
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Gürkan, Hakan, Gönüleren, Ali Nur, and Elektronik ve Haberleşme Mühendisliği Ana Bilim Dalı
- Subjects
Current conveyor circuits ,Active filters ,Elektrik ve Elektronik Mühendisliği ,Filters ,Electrical and Electronics Engineering - Abstract
ÖZET Bu tez çalışmasının amacı, bugüne kadar işlemsel kuvvetlendirici kullanılarak tasarlanan SC aktif filtre devrelerini, ikinci kuşak akım taşıyıcı eleman ( CCII ) ile tasarlamaktır. Genel ikinci derece z domeni transfer fonksiyonunun öncelikle işaret akış diyagramı elde edilmiştir. Akım taşıyıcı toplama devresi ve bu devrenin işaret akış diyagramı baz alınarak, elde edilen işaret akış diyagramından akım taşıyıcı içeren SC aktif filtrenin devre topolojisine geçilmiştir. Bu geçiş, işaret akış diyagramının dal kazançlarının mutlak değerleri devredeki kapasite değerlerini; işaret akış diyagramının dal kazançlarının işaretleri de akım taşıyıcıların akım kazançlarını belirleyecek şekilde yapılmıştır. Elde edilen bu devre özelleştirilerek alçak geçiren, yüksek geçiren, band geçiren ve notch tipi filtrelerin devre topolojileri çıkartılmış ve devrede yer alan elemanların değerleri, ilgili fonksiyonun katsayıları cinsinden belirlenmiştir. Ayrıca bu devrelerin kararlılık koşulları ve duyarlılık fonksiyonları incelenmiştir. Bu biçimde elde edilen CCII-SC aktif filtre tasarımını bilgisayar ortamına aktarmak için C dilinde bir bilgisayar programı hazırlanmıştır. Bu program dijital karakteristikleri girilen alçak, yüksek, band geçiren filtrelerin transfer fonksiyonunu hesaplamaktadır. Daha sonra bu fonksiyonun katsayılarına göre eleman değerlerini bulmaktadır. Bulduğu bu değerleri devrenin dinamik aralığını ve devrede yer alacak minimum kapasite değerini dikkate alarak normalize etmektedir. Ayrıca transfer fonksiyonun frekans karakteristiğini de çizmektedir. Son olarak birkaç filtre tasarımı hazırlanmış ve son bölümde örnek olarak sunulmuştur. Hazırlanan bu örnekler spice simülasyon programı yardımıyla analiz edilmişlerdir. Analiz sırasında kullanılan devreler ideal akım taşıyıcı ve ideal anahtar içerir. Analiz sonucunda tasarlanan filtrelerin istenen frekans karakteristiklerini sağladıkları görülmüştür. xı DESIGN OF SWITCHED CAPACITOR ACTIVE FILTER USING CURRENT CONVEYOR The system given in figure 1 shows the analog signal being passed through a continuous anti-aliasing filter, an input sample-and-hold circuit (S/H) which samples the band-limited analog input at intervals of l/fci » the switched capacitor filter, an output sample-and-hold circuit (S/H)0 which resamples the output of the SC filter at intervals l/fCN, and a final continuous reconstruction filter which serves to smooth the sharp transitions in the sampled-data waveform. out T2 Figure 1 Sampled-data filter system for analog input and smooth analog output The SC filter is shown to be controlled by clocks of multiple frequencies (fC2 through fcN-0- To minimize the silicon area, it is often desirable to clock the low- pass sections at a high rate in order to lesson the burden on the continuous anti aliasing filter, and to clock the high-pass sections at a lower rate, in order to reduce their total capacitance. Since the low-pass sections, sampled at fC2, precede the high- pass sections which are sampled at fC3
- Published
- 1998
50. Investigation of IL23R, JAK2, and STAT3 gene polymorphisms and gene-gene interactions in Crohn's disease and ulcerative colitis in a Turkish population.
- Author
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Can, Güray, Tezel, Ahmet, Gürkan, Hakan, Tozkır, Hilmi, Ünsal, Gülbin, Soylu, Ali Rıza, and Ümit, Hasan Celalettin
- Published
- 2016
- Full Text
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