14 results on '"Myrtani Pieri"'
Search Results
2. The genome sequence of Rhynchonycteris naso, Peters, 1867 (Chiroptera, Emballonuridae, Rhynchonycteris) [version 1; peer review: 3 approved]
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Erich Jarvis, Emma C. Teeling, Ine Alvarez van Tussenbroek, Martina Nagy, Mirjam Knörnschild, Philip Philge, Brian P. O'Toole, Myrtani Pieri, Nadolina Brajuka, Giulio Formenti, Linelle Abueg, Ning Zhang, Sonja C. Vernes, Thomas L. Volkert, Jonathan L. Gray, and Meike Mai
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Rhynchonycteris naso ,genome sequence ,chromosomal ,Bat1K ,eng ,Medicine ,Science - Abstract
We present a reference genome assembly from an individual male Rhynchonycteris naso (Chordata; Mammalia; Chiroptera; Emballonuridae). The genome sequence is 2.46 Gb in span. The majority of the assembly is scaffolded into 22 chromosomal pseudomolecules, with the Y sex chromosome assembled.
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- 2024
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3. The genome sequence of Tadarida brasiliensis I. Geoffroy Saint-Hilaire, 1824 [Molossidae; Tadarida] [version 1; peer review: 2 approved, 1 approved with reservations]
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Michael Smotherman, Cara F. Webster, Thomas Brown, Martin Pippel, Meike Mai, Eugene W. Myers, Sylke Winkler, Sonja C. Vernes, Emma C. Teeling, and Myrtani Pieri
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Tadarida brasiliensis ,genome sequence ,chromosomal ,Bat1K ,eng ,Medicine ,Science - Abstract
We present a genome assembly from an individual male Tadarida brasiliensis (The Brazilian free-tailed bat; Chordata; Mammalia; Chiroptera; Molossidae). The genome sequence is 2.28 Gb in span. The majority of the assembly is scaffolded into 25 chromosomal pseudomolecules, with the X and Y sex chromosomes assembled.
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- 2024
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4. The genome sequence of Molossus nigricans (Chiroptera, Molossidae; Miller, 1902) [version 1; peer review: 2 approved, 1 approved with reservations]
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Melissa R. Ingala, Nancy B. Simmons, Thomas L. Volkert, Myrtani Pieri, Philge Philip, Larry N. Singh, Ning Zhang, Laramie L. Lindsey, Brian P. O'Toole, Jonathan L. Gray, Emma C. Teeling, Meike Mai, and Sonja C. Vernes
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Molossus nigricans ,genome sequence ,chromosomal ,Bat1K ,eng ,Medicine ,Science - Abstract
We present a genome assembly from an individual male Molossus nigricans (Chordata; Mammalia; Chiroptera; Molossidae). The genome sequence is 2.41 gigabases in span. The majority of the assembly is scaffolded into 24 chromosomal pseudomolecules, with the X sex chromosome assembled.
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- 2023
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5. Seroprevalence of immunoglobulin G antibodies against SARS-CoV-2 in Cyprus.
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Christos Papaneophytou, Andria Nicolaou, Myrtani Pieri, Vicky Nicolaidou, Eleftheria Galatou, Yiannis Sarigiannis, Markella Pantelidou, Pavlos Panayi, Theklios Thoma, Antonia Stavraki, Xenia Argyrou, Tasos Kalogiannis, Kyriacos Yiannoukas, Christos C Petrou, and Kyriacos Felekkis
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Medicine ,Science - Abstract
Monitoring the levels of IgG antibodies against the SARS-CoV-2 is important during the coronavirus disease 2019 (COVID-19) pandemic, to plan an adequate and evidence-based public health response. After this study we report that the plasma levels of IgG antibodies against SARS-CoV-2 spike protein were higher in individuals with evidence of prior infection who received at least one dose of either an mRNA-based vaccine (Comirnaty BNT162b2/Pfizer-BioNTech or Spikevax mRNA-1273/Moderna) or an adenoviral-based vaccine (Vaxzervia ChAdOx1 nCoV-19 /Oxford-Astra Zeneca) (n = 39) compared to i) unvaccinated individuals with evidence of prior infection with SARS-CoV-2 (n = 109) and ii) individuals without evidence of prior infection with SARS-CoV-2 who received one or two doses of one of the aforementioned vaccines (n = 342). Our analysis also revealed that regardless of the vaccine technology (mRNA-based and adenoviral vector-based) two doses achieved high anti- SARS-CoV-2 IgG responses. Our results indicate that vaccine-induced responses lead to higher levels of IgG antibodies compared to those produced following infection with the virus. Additionally, in agreement with previous studies, our results suggest that among individuals previously infected with SARS-CoV-2, even a single dose of a vaccine is adequate to elicit high levels of antibody response.
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- 2022
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6. A functional variant in NEPH3 gene confers high risk of renal failure in primary hematuric glomerulopathies. Evidence for predisposition to microalbuminuria in the general population.
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Konstantinos Voskarides, Charalambos Stefanou, Myrtani Pieri, Panayiota Demosthenous, Kyriakos Felekkis, Maria Arsali, Yiannis Athanasiou, Dimitris Xydakis, Kostas Stylianou, Eugenios Daphnis, Giorgos Goulielmos, Petros Loizou, Judith Savige, Martin Höhne, Linus A Völker, Thomas Benzing, Patrick H Maxwell, Daniel P Gale, Mathias Gorski, Carsten Böger, Barbara Kollerits, Florian Kronenberg, Bernhard Paulweber, Michalis Zavros, Alkis Pierides, and Constantinos Deltas
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Medicine ,Science - Abstract
BACKGROUND:Recent data emphasize that thin basement membrane nephropathy (TBMN) should not be viewed as a form of benign familial hematuria since chronic renal failure (CRF) and even end-stage renal disease (ESRD), is a possible development for a subset of patients on long-term follow-up, through the onset of focal and segmental glomerulosclerosis (FSGS). We hypothesize that genetic modifiers may explain this variability of symptoms. METHODS:We looked in silico for potentially deleterious functional SNPs, using very strict criteria, in all the genes significantly expressed in the slit diaphragm (SD). Two variants were genotyped in a cohort of well-studied adult TBMN patients from 19 Greek-Cypriot families, with a homogeneous genetic background. Patients were categorized as "Severe" or "Mild", based on the presence or not of proteinuria, CRF and ESRD. A larger pooled cohort (HEMATURIA) of 524 patients, including IgA nephropathy patients, was used for verification. Additionally, three large general population cohorts [Framingham Heart Study (FHS), KORAF4 and SAPHIR] were used to investigate if the NEPH3-V353M variant has any renal effect in the general population. RESULTS AND CONCLUSIONS:Genotyping for two high-scored variants in 103 TBMN adult patients with founder mutations who were classified as mildly or severely affected, pointed to an association with variant NEPH3-V353M (filtrin). This promising result prompted testing in the larger pooled cohort (HEMATURIA), indicating an association of the 353M variant with disease severity under the dominant model (p = 3.0x10-3, OR = 6.64 adjusting for gender/age; allelic association: p = 4.2x10-3 adjusting for patients' kinships). Subsequently, genotyping 6,531 subjects of the Framingham Heart Study (FHS) revealed an association of the homozygous 353M/M genotype with microalbuminuria (p = 1.0x10-3). Two further general population cohorts, KORAF4 and SAPHIR confirmed the association, and a meta-analysis of all three cohorts (11,258 individuals) was highly significant (p = 1.3x10-5, OR = 7.46). Functional studies showed that Neph3 homodimerization and Neph3-Nephrin heterodimerization are disturbed by variant 353M. Additionally, 353M was associated with differential activation of the unfolded protein response pathway, when overexpressed in stressed cultured undifferentiated podocyte cells, thus attesting to its functional significance. Genetics and functional studies support a "rare variant-strong effect" role for NEPH3-V353M, by exerting a negative modifier effect on primary glomerular hematuria. Additionally, genetics studies provide evidence for a role in predisposing homozygous subjects of the general population to micro-albuminuria.
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- 2017
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7. Frequency of COL4A3/COL4A4 mutations amongst families segregating glomerular microscopic hematuria and evidence for activation of the unfolded protein response. Focal and segmental glomerulosclerosis is a frequent development during ageing.
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Louiza Papazachariou, Panayiota Demosthenous, Myrtani Pieri, Gregory Papagregoriou, Isavella Savva, Christoforos Stavrou, Michael Zavros, Yiannis Athanasiou, Kyriakos Ioannou, Charalambos Patsias, Alexia Panagides, Costas Potamitis, Kyproula Demetriou, Marios Prikis, Michael Hadjigavriel, Maria Kkolou, Panayiota Loukaidou, Androulla Pastelli, Aristos Michael, Akis Lazarou, Maria Arsali, Loukas Damianou, Ioanna Goutziamani, Andreas Soloukides, Lakis Yioukas, Avraam Elia, Ioanna Zouvani, Polycarpos Polycarpou, Alkis Pierides, Konstantinos Voskarides, and Constantinos Deltas
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Medicine ,Science - Abstract
Familial glomerular hematuria(s) comprise a genetically heterogeneous group of conditions which include Alport Syndrome (AS) and thin basement membrane nephropathy (TBMN). Here we investigated 57 Greek-Cypriot families presenting glomerular microscopic hematuria (GMH), with or without proteinuria or chronic kidney function decline, but excluded classical AS. We specifically searched the COL4A3/A4 genes and identified 8 heterozygous mutations in 16 families (28,1%). Eight non-related families featured the founder mutation COL4A3-p.(G1334E). Renal biopsies from 8 patients showed TBMN and focal segmental glomerulosclerosis (FSGS). Ten patients (11.5%) reached end-stage kidney disease (ESKD) at ages ranging from 37-69-yo (mean 50,1-yo). Next generation sequencing of the patients who progressed to ESKD failed to reveal a second mutation in any of the COL4A3/A4/A5 genes, supporting that true heterozygosity for COL4A3/A4 mutations predisposes to CRF/ESKD. Although this could be viewed as a milder and late-onset form of autosomal dominant AS, we had no evidence of ultrastructural features or extrarenal manifestations that would justify this diagnosis. Functional studies in cultured podocytes transfected with wild type or mutant COL4A3 chains showed retention of mutant collagens and differential activation of the unfolded protein response (UPR) cascade. This signifies the potential role of the UPR cascade in modulating the final phenotype in patients with collagen IV nephropathies.
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- 2014
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8. Variability in the levels of exosomal miRNAs among human subjects could be explained by differential interactions of exosomes with the endothelium
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Christos Papaneophytou, Myrtani Pieri, and Kyriacos Felekkis
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Endothelium ,Research Subjects ,Clinical Biochemistry ,Cancer ,RNA ,Inflammation ,Cell Biology ,Biology ,Bioinformatics ,medicine.disease ,Exosomes ,Biochemistry ,Microvesicles ,MicroRNAs ,medicine.anatomical_structure ,Blood circulation ,microRNA ,Genetics ,medicine ,Humans ,Exosomal mirnas ,RNA, Messenger ,medicine.symptom ,Molecular Biology - Abstract
Exosomes are 30-100 nm endosome-derived membrane vesicles, that contain specific RNA transcripts including mRNAs, and microRNAs (miRNAs) and have been implicated in cell-to-cell communication. Exosomal miRNAs in blood circulation have been attracting major interest as potential diagnostic and prognostic biomarkers in a variety of diseases including stroke, cancer, and inflammatory disorders. Despite the progress made in the utilization of circulating exosomal miRNAs as biomarkers for various human diseases and conditions, there are still difficulties in functionally utilizing such methods in the clinic due to the high variability observed among subjects. Attempts to use miRNA signatures have improved but have not eliminated the problem. Additionally, standardized laboratory practices may partially reduce variability but there is still an unknown biological factor that hinders the proper use of miRNAs as biomarkers. We hypothesize that this variability might be partially attributed to a differential interaction among circulating exosomes carrying those miRNAs with endothelial surface molecules that themselves may vary among individuals due to secondary conditions, for example, inflammation status. This differential interaction could potentially add variability to the level of the examined miRNA that is not directly attributed to the primary condition under study.
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- 2021
9. Survival of vaccine-induced human milk SARS-CoV-2 IgG and IgA immunoglobulins across simulated human infant gastrointestinal digestion
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Myrtani Pieri, Christos Papaneophytou, Kyriacos Felekkis, Spyros Pipis, Vicky Nicolaidou, and Irene Paphiti
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education.field_of_study ,biology ,business.industry ,medicine.medical_treatment ,Population ,Breastfeeding ,Passive immunity ,Virus ,Vaccination ,Pandemic ,Immunology ,biology.protein ,Medicine ,Antibody ,Digestion ,education ,business - Abstract
Four vaccines have been approved to date by the European Medicines Agency for the management of the COVID-19 pandemic in Europe, with all four being targeted to adults over 18 years of age. One way to protect the younger population such as infants or younger children until pediatric vaccines are licensed is through passive immunity via breastfeeding. Recent evidence points to the fact that human milk contains immunoglobulins (Ig) against the SARS-CoV-2 virus, both after natural infection or vaccination, but it is not known whether these antibodies can resist enzymatic degradation during digestion in the infant gastrointestinal (GI) tract or indeed protect the consumers. Here, we describe our preliminary experiments where we validated commercially available ELISA kits to detect IgA and IgG antibodies in human milk from two lactating mothers vaccinated with either the Pfizer/BioNTech or the Astra Zeneca vaccine, and the effect of a static in vitro digestion protocol on the IgA and IgG concentrations. Our data, even preliminary, provide an indication that the IgA antibodies produced after vaccination with the Pfizer/BioNTech vaccine resist the gastric phase but are degraded during the intestinal phase of infant digestion, whereas the IgGs are more prone to degradation in both phases of digestion. We are in the process of recruiting more individuals to further evaluate the vaccine induced immunoglobulin profile of breastmilk, and the extent to which these antibodies can resist digestion in the infant GI tract.
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- 2021
10. A glycine substitution in the collagenous domain of Col4a3 in mice recapitulates late onset Alport syndrome
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Kostas Stylianou, Charalambos Stefanou, Myrtani Pieri, Constantinos Deltas, Kyriaki Antoniadou, Neoklis Makrides, Christoforos Odiatis, Oliver Gross, Dorin-Bogdan Borza, Gregory Papagregoriou, Pavlos Ioannou, Georgios Nikolaou, Isavella Savva, Petros Petrou, and Danica Galešić Ljubanović
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Histology ,Mutant ,030232 urology & nephrology ,Biophysics ,Biology ,Compound heterozygosity ,urologic and male genital diseases ,Biochemistry ,Article ,TBM, tubular basement membrane ,Mouse model ,03 medical and health sciences ,0302 clinical medicine ,UPR, unfolded protein response ,Glomerulopathy ,Genetics ,medicine ,Missense mutation ,Allele ,Alport syndrome ,Molecular Biology ,lcsh:QH301-705.5 ,030304 developmental biology ,0303 health sciences ,Metalloproteinase ,EM, electron microscopy ,ARAS, autosomal recessive alport syndrome ,AS, alport syndrome ,BSA, bovine serum albumin ,Collagen-IV ,ESRD, end stage renal disease ,GBM, glomerular basement membrane ,Glomerular basement membrane ,Glycine missense mutation ,Kidney disease ,PAS, periodic acid schiff ,TGF-b1, transforming growth factor beta1 ,Cell Biology ,medicine.disease ,Molecular biology ,medicine.anatomical_structure ,lcsh:Biology (General) - Abstract
Alport syndrome (AS) is a severe inherited glomerulopathy caused by mutations in the genes encoding the α-chains of type-IV collagen, the most abundant component of the extracellular glomerular basement membrane (GBM). Currently most AS mouse models are knockout models for one of the collagen-IV genes. In contrast, about half of AS patients have missense mutations, with single aminoacid substitutions of glycine being the most common. The only mouse model for AS with a homozygous knockin missense mutation, Col4a3-p.Gly1332Glu, was partly described before by our group. Here, a detailed in-depth description of the same mouse is presented, along with another compound heterozygous mouse that carries the glycine substitution in trans with a knockout allele. Both mice recapitulate essential features of AS, including shorten lifespan by 30–35%, increased proteinuria, increased serum urea and creatinine, pathognomonic alternate GBM thinning and thickening, and podocyte foot process effacement. Notably, glomeruli and tubuli respond differently to mutant collagen-IV protomers, with reduced expression in tubules but apparently normal in glomeruli. However, equally important is the fact that in the glomeruli the mutant α3-chain as well as the normal α4/α5 chains seem to undergo a cleavage at, or near the point of the mutation, possibly by the metalloproteinase MMP-9, producing a 35 kDa C-terminal fragment. These mouse models represent a good tool for better understanding the spectrum of molecular mechanisms governing collagen-IV nephropathies and could be used for pre-clinical studies aimed at better treatments for AS., Highlights • Two mouse models were generated that recapitulate essential features of AS patients. • Glomeruli and tubuli respond differently to mutant collagen IV protomers. • The mutant colIV protomers in glomeruli probably undergo a cleavage process by MMP9. • The two AS mouse models represent a good tool for studying collagen-IV nephropathies. • These models could be used for pre-clinical studies aimed at better treatments.
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- 2021
11. Hypothesis as to How a Common Missense Mutation in COL4A3 May Confer Protection against Diabetic Kidney Disease
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Myrtani Pieri
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medicine.medical_specialty ,Diabetic kidney ,business.industry ,General Medicine ,Disease ,Podocyte ,medicine.anatomical_structure ,Endocrinology ,Nephrology ,Internal medicine ,Diabetic glomerulopathy ,Unfolded protein response ,Missense mutation ,Medicine ,business - Published
- 2020
12. FP070PHENOTYPIC ANALYSIS OF TWO ALPORT SYNDROME MODEL MICE WITH A COL4Α3 G1332E MUTATION
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Isavella Savva, Myrtani Pieri, Petros Petrou, Dorin-Bogdan Borza, Neoklis Makrides, George Nikolaou, Gregory Papagregoriou, Pavlos Ioannou, Christoforos Odiatis, and Constantinos Deltas
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Genetics ,Transplantation ,Nephrology ,business.industry ,Mutation (genetic algorithm) ,Medicine ,Alport syndrome ,business ,medicine.disease - Published
- 2019
13. MP036A NOVEL KNOCKIN MOUSE MODEL FOR ALPORT SYNDROME
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Myrtani Pieri, Gregoris Papagregoriou, Dorin B Borza, Charalampos Stefanou, Isavella Savva, Constantinos Deltas, Kostas Stylianou, George Lapathitis, and Christos Karaiskos
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Transplantation ,Pathology ,medicine.medical_specialty ,Nephrology ,business.industry ,Medicine ,Alport syndrome ,business ,medicine.disease - Published
- 2016
14. Targeting ketone drugs towards transport by the intestinal peptide transporter, PepT1
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David Meredith, David W. Foley, Myrtani Pieri, and Patrick D. Bailey
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Ketone ,Stereochemistry ,Nabumetone ,Stereoisomerism ,Peptide ,01 natural sciences ,Biochemistry ,Peptide Transporter 1 ,03 medical and health sciences ,Intestine, Small ,medicine ,Humans ,Prodrugs ,Sulfhydryl Compounds ,Physical and Theoretical Chemistry ,030304 developmental biology ,chemistry.chemical_classification ,0303 health sciences ,Molecular Structure ,Symporters ,010405 organic chemistry ,Chemistry ,Organic Chemistry ,Transporter ,Biological Transport ,Dipeptides ,Prodrug ,Ketones ,In vitro ,Butanones ,3. Good health ,0104 chemical sciences ,Symporter ,medicine.drug - Abstract
Thiodipeptide prodrugs of the ketone nabumetone are shown to have affinity for, and be transported by, PepT1 in vitro.
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- 2009
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