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217 results on '"Neerman-Arbez M"'

24. GNBS Mutations Cause an Autosomal-Recessive Multisystem Syndrome with Sinus Bradycardia and Cognitive Disability

Author

Lodder EM, De Nittis P, Koopman CD, Wiszniewski W, de Souza CFM, Lahrouchi N, Guex N, Napolioni V, Tessadori F, Beekman L, Nannenberg EA, Boualla L, Blom NA, de Graaff W, Kamermans M, Cocciadiferro D, Malerba N, Mandriani B, Akdemir ZHC, Fish RJ, Eldomery MK, Ratbi I, Wilde AAM, de Boer T, Simonds WF, Neerman-Arbez M, Sutton VR, Kok F, Lupski JR, Reymond A, Bezzina CR, Bakkers J, Merla G, Lodder, Em, De Nittis, P, Koopman, Cd, Wiszniewski, W, de Souza, Cfm, Lahrouchi, N, Guex, N, Napolioni, V, Tessadori, F, Beekman, L, Nannenberg, Ea, Boualla, L, Blom, Na, de Graaff, W, Kamermans, M, Cocciadiferro, D, Malerba, N, Mandriani, B, Akdemir, Zhc, Fish, Rj, Eldomery, Mk, Ratbi, I, Wilde, Aam, de Boer, T, Simonds, Wf, Neerman-Arbez, M, Sutton, Vr, Kok, F, Lupski, Jr, Reymond, A, Bezzina, Cr, Bakkers, J, and Merla, G

Abstract

GNB5 encodes the G protein beta subunit 5 and is involved in inhibitory G protein signaling. Here, we report mutations in GNB5 that are associated with heart-rate disturbance, eye disease, intellectual disability, gastric problems, hypotonia, and seizures in nine individuals from six families. We observed an association between the nature of the variants and clinical severity; individuals with loss-of-function alleles had more severe symptoms, including substantial developmental delay, speech defects, severe hypotonia, pathological gastro-esophageal re flux, retinal disease, and sinus-node dysfunction, whereas related heterozygotes harboring missense variants presented with a clinically milder phenotype. Zebrafish gnb5 knockouts recapitulated the phenotypic spectrum of affected individuals, including cardiac, neurological, and ophthalmological abnormalities, supporting a direct role of GNB5 in the control of heart rate, hypotonia, and vision.

Published
2016

28. A high-throughput sequencing test for diagnosing inherited bleeding, thrombotic, and platelet disorders

Author

Simeoni, I., Stephens, J.C., Hu, F., Deevi, S.V.V., Megy, K., Bariana, T.K., Lentaigne, C., Schulman, S., Sivapalaratnam, S., Vries, M.J.A., Westbury, S.K., Greene, D., Papadia, S., Alessi, M-C, Attwood, A.P., Ballmaier, M., Baynam, G., Bermejo, E., Bertoli, M., Bray, P.F., Bury, L., Cattaneo, M., Collins, P., Daugherty, L.C., Favier, R., French, D.L., Furie, B., Gattens, M., Germeshausen, M., Ghevaert, C., Goodeve, A.C., Guerrero, J.A., Hampshire, D.J., Hart, D.P., Heemskerk, J.W.M., Henskens, Y.M.C., Hill, M., Hogg, N., Jolley, J.D., Kahr, W.H., Kelly, A.M., Kerr, R., Kostadima, M., Kunishima, S., Lambert, M.P., Liesner, R., Lopez, J.A., Mapeta, R.P., Mathias, M., Millar, C.M., Nathwani, A., Neerman-Arbez, M., Nurden, A.T., Nurden, P., Othman, M., Peerlinck, K., Perry, D.J., Poudel, P., Reitsma, P., Rondina, M.T., Smethurst, P.A., Stevenson, W., Szkotak, A., Tuna, S., van Geet, C., Whitehorn, D., Wilcox, D.A., Zhang, B., Revel-Vilk, S., Gresele, P., Bellissimo, D.B., Penkett, C.J., Laffan, M.A., Mumford, A.D., Rendon, A., Gomez, K., Freson, K., Ouwehand, W.H., Turro, E., Simeoni, I., Stephens, J.C., Hu, F., Deevi, S.V.V., Megy, K., Bariana, T.K., Lentaigne, C., Schulman, S., Sivapalaratnam, S., Vries, M.J.A., Westbury, S.K., Greene, D., Papadia, S., Alessi, M-C, Attwood, A.P., Ballmaier, M., Baynam, G., Bermejo, E., Bertoli, M., Bray, P.F., Bury, L., Cattaneo, M., Collins, P., Daugherty, L.C., Favier, R., French, D.L., Furie, B., Gattens, M., Germeshausen, M., Ghevaert, C., Goodeve, A.C., Guerrero, J.A., Hampshire, D.J., Hart, D.P., Heemskerk, J.W.M., Henskens, Y.M.C., Hill, M., Hogg, N., Jolley, J.D., Kahr, W.H., Kelly, A.M., Kerr, R., Kostadima, M., Kunishima, S., Lambert, M.P., Liesner, R., Lopez, J.A., Mapeta, R.P., Mathias, M., Millar, C.M., Nathwani, A., Neerman-Arbez, M., Nurden, A.T., Nurden, P., Othman, M., Peerlinck, K., Perry, D.J., Poudel, P., Reitsma, P., Rondina, M.T., Smethurst, P.A., Stevenson, W., Szkotak, A., Tuna, S., van Geet, C., Whitehorn, D., Wilcox, D.A., Zhang, B., Revel-Vilk, S., Gresele, P., Bellissimo, D.B., Penkett, C.J., Laffan, M.A., Mumford, A.D., Rendon, A., Gomez, K., Freson, K., Ouwehand, W.H., and Turro, E.

Abstract

Inherited bleeding, thrombotic, and platelet disorders (BPDs) are diseases that affect ∼300 individuals per million births. With the exception of hemophilia and von Willebrand disease patients, a molecular analysis for patients with a BPD is often unavailable. Many specialized tests are usually required to reach a putative diagnosis and they are typically performed in a step-wise manner to control costs. This approach causes delays and a conclusive molecular diagnosis is often never reached, which can compromise treatment and impede rapid identification of affected relatives. To address this unmet diagnostic need, we designed a high-throughput sequencing platform targeting 63 genes relevant for BPDs. The platform can call single nucleotide variants, short insertions/deletions, and large copy number variants (though not inversions) which are subjected to automated filtering for diagnostic prioritization, resulting in an average of 5.34 candidate variants per individual. We sequenced 159 and 137 samples, respectively, from cases with and without previously known causal variants. Among the latter group, 61 cases had clinical and laboratory phenotypes indicative of a particular molecular etiology, whereas the remainder had an a priori highly uncertain etiology. All previously detected variants were recapitulated and, when the etiology was suspected but unknown or uncertain, a molecular diagnosis was reached in 56 of 61 and only 8 of 76 cases, respectively. The latter category highlights the need for further research into novel causes of BPDs. The ThromboGenomics platform thus provides an affordable DNA-based test to diagnose patients suspected of having a known inherited BPD.

Published
2016

29. Thromboelastographic phenotypes of fibrinogen and its variants: Clinical and non-clinical implications

Author

Galanakis, D.K. Neerman-Arbez, M. Brennan, S. Rafailovich, M. Hyder, L. Travlou, O. Papadakis, E. Manco-Johnson, M.J. Henschen, A. Scharrer, I.

Abstract

Introduction Thromboelastography (TEG), a widely used clinical point of care coagulation test, is poorly understood. To investigate its fibrin determinants we used normal and variant fibrinogen isolates. Materials and Methods We focused mainly on the TEG maximum signal amplitude (MA), a shear modulus and clot stiffness indicator. Isolates included normal des-αC, cord, and abnormal congenital variants with amino acid substitutions or deletions that impaired fibrin polymerization. Heterophenotypic congenital isolates were from cryoprecipitate-depleted plasma owing to their more diminished clot MA than their cryoprecipitate counterparts. By colorimetric assay, the amount of fibrinogen adsorbed by untreated TEG cups was 83.5 ± 12.4 pM/cm2, n = 18. Thrombin-induced clots were obtained at pH 6.4 or 7.4, the latter containing 8 mM CaCl2, and 14% afibrinogenemic plasma with and without gel-sieved platelets. Results and Conclusions Measured by the water droplet contact angle, > 90% reduction of surface hydrophobicity by exposure of TEG cup and pin to ozone plasma decreased MA by 74%. Increasing normal fibrinogen or thrombin concentrations progressively increased MA. Platelets increased MA further ~ 2 fold, except for ≥ 10 fold for des-αC clots. Examined in the absence of platelets, MA of heterophenotypic fibrin variants averaged 21%, n = 15. The results imply that essential MA determinants include hydrophobic fibrinogen/fibrin adsorption and each polymerization contact site, with substantial enhancement by platelets. Also, cryoprecipitate-harvested soluble fibrinogen/fibrin complexes contained mostly normal molecules, while cryoprecipitate-depleted plasma contained mostly variant molecules. Moreover, significantly decreased MA by fibrinogen anomalies and/or low level thrombin generation can potentially impact clinical interpretation of MA. © 2014 Elsevier Ltd. All rights reserved.

Published
2014

43. In vitrorescue of FGAdeletion by lentiviral transduction of an afibrinogenemic patient's hepatocytes

Author

Stroka, D., Keogh, A., Vu, D., Fort, A., Stoffel, M.H., Kühni‐Boghenbor, K., Furer, C., Banz, V., Demarmels Biasiutti, F., Lämmle, B., Candinas, D., and Neerman‐Arbez, M.

Abstract

Congenital afibrinogenemia is a rare inherited autosomal recessive disorder in which a mutation in one of three genes coding for the fibrinogen polypeptide chains Aα, Bβ and γ results in the absence of a functional coagulation protein. A patient with congenital afibrinogenemia, resulting from an FGAhomozygous gene deletion, underwent an orthotopic liver transplant that resulted in complete restoration of normal hemostasis. The patient's explanted liver provided a unique opportunity to further investigate a potential novel treatment modality.

Published
2014
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44. Des-(27-31)C-peptide. A novel secretory product of the rat pancreatic beta cell produced by truncation of proinsulin connecting peptide in secretory granules.

Author

Verchere, C B, Paoletta, M, Neerman-Arbez, M, Rose, K, Irminger, J C, Gingerich, R L, Kahn, S E, and Halban, P A

Abstract

Insulin and connecting peptide (C-peptide) are produced in equimolar amounts during proinsulin conversion in the pancreatic beta cell secretory granule. To determine whether insulin and C-peptide are equally stable in beta cell granules (and thus secreted in equimolar amounts), neonatal and adult rat beta cells were pulse-chased, and radiolabeled insulin and C-peptide analyzed by high performance liquid chromatography. A novel truncated C-peptide was identified and shown by mass spectrometry to be des-(27-31)C-peptide (loss of 5 C-terminal amino acids). Des-(27-31)C-peptide is a major beta cell secretory product, accounting for 37.4 +/- 1.6% (neonatal) and 8.5 +/- 0.6% (adult) of total labeled C-peptide in secretory granules after 10 h of chase. Des-(27-31)C-peptide is also secreted in a glucose-sensitive manner from the perfused adult rat pancreas, accounting for approximately 10% of total C-peptide immunoreactivity secreted. Human C-peptide is also a substrate for truncation in granules. Thus, when human proinsulin was expressed (infection with recombinant adenovirus) in transformed (INS) rat beta cells, human des-(27-31)C-peptide was secreted along with the intact human peptide and both intact and truncated rat C-peptide. In addition to truncation, 33.1 +/- 1.2% of C-peptide in neonatal but not adult rat beta cell granules was further degraded. Such degradation was completely inhibited by ammonium chloride (known to neutralize intra-granular pH), whereas truncation was only partially inhibited by approximately 50%. In conclusion, a novel beta cell secretory product, des-(27-31)C-peptide, has been identified and should be considered as a potential bioactive peptide. Both truncation and degradation of C-peptide are responsible for non-equimolar secretion of insulin and C-peptide in rat beta cells.

Published
1996

48. Regulation of fibrinogen synthesis.

Author

Dobson DA, Fish RJ, de Vries PS, Morrison AC, Neerman-Arbez M, and Wolberg AS

Subjects
Humans, Animals, Fibrinogen metabolism, Fibrinogen genetics
Abstract

The plasma protein fibrinogen is encoded by 3 structural genes (FGA, FGB, and FGG) that are transcribed to mRNA, spliced, and translated to 3 polypeptide chains (Aα, Bβ, and γ, respectively). These chains are targeted for secretion, decorated with post-translational modifications, and assembled into a hexameric "dimer of trimers" (AαBβγ) 2 . Fully assembled fibrinogen is secreted into the blood as a 340 kDa glycoprotein. Fibrinogen is one of the most prevalent coagulation proteins in blood, and its expression is induced by inflammatory cytokines, wherein circulating fibrinogen levels may increase up to 3-fold during acute inflammatory events. Abnormal levels of circulating fibrinogen are associated with bleeding and thrombotic disorders, as well as several inflammatory diseases. Notably, therapeutic strategies to modulate fibrinogen levels have shown promise in experimental models of disease. Herein, we review pathways mediating fibrinogen synthesis, from gene expression to secretion. Knowledge of these mechanisms may lead to the identification of biomarkers and new therapeutic targets to modulate fibrinogen in health and disease., Competing Interests: Declaration of competing interest The authors have no competing financial interests to declare., (Copyright © 2024 Elsevier Ltd. All rights reserved.)

Published
2024
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49. Perinatal stroke and hypofibrinogenemia: Is the new missense fibrinogen variant γ p.Gly310Glu the cause of the procoagulant state?

Author

Marchi R, Meunier S, Rezigue H, Fretigny M, Alotaibi S, Neerman-Arbez M, de Mazancourt P, and Casini A

Subjects
Humans, Fibrinogen genetics, Child, Preschool, Afibrinogenemia genetics, Afibrinogenemia blood, Mutation, Missense, Stroke genetics, Stroke blood
Abstract

Competing Interests: Declaration of competing interest A. Casini reports fees for consultancy, grants and fees for travel paid to his institution from Octapharma, Sobi, LFB, Takeda, and Novo Nordisk.

Published
2024
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50. Clinical, Laboratory, and Molecular Aspects of Congenital Fibrinogen Disorders.

Author

Casini A, Moerloose P, and Neerman-Arbez M

Abstract

Congenital fibrinogen disorders (CFDs) include afibrinogenemia, hypofibrinogenemia, dysfibrinogenemia, and hypodysfibrinogenemia. The fibrinogen levels, the clinical features, and the genotype define several sub-types, each with specific biological and clinical issues. The diagnosis of CFDs is based on the measurement of activity and antigen fibrinogen levels as well as on the genotype. While relatively easy in quantitative fibrinogen disorders, the diagnosis can be more challenging in qualitative fibrinogen disorders depending on the reagents and methods used, and the underlying fibrinogen variants. Overall, quantitative and qualitative fibrinogen defects lead to a decrease in clottability, and usually in a bleeding tendency. The severity of the bleeding phenotype is moreover related to the concentration of fibrinogen. Paradoxically, patients with CFDs are also at risk of thrombotic events. The impact of the causative mutation on the structure and the fibrinogen level is one of the determinants of the thrombotic profile. Given the major role of fibrinogen in pregnancy, women with CFDs are particularly at risk of obstetrical adverse outcomes. The study of the fibrin clot properties can help to define the impact of fibrinogen disorders on the fibrin network. The development of next generation sequencing now allows the identification of genetic modifiers able to influence the global hemostasis balance in CFDs. Their integration in the assessment of the patient risk on an individual scale is an important step toward precision medicine in patients with such a heterogeneous clinical course., Competing Interests: None declared., (Thieme. All rights reserved.)

Published
2024
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