Eight novel F13A1 gene missense mutations in patients with mild FXIII deficiency: in silico analysis suggests changes in FXIII-A subunit structure/function |
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Authors: | Arijit Biswas Vytautas Ivaskevicius Anne Thomas Michael Varvenne Brigitte Brand Hannelore Rott Iris Haussels Heiko Ruehl Ute Scholz Robert Klamroth Johannes Oldenburg |
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Institution: | 1. Institute of Experimental Haematology and Transfusion Medicine, University Clinic Bonn, Sigmund-Freud-Str. 25, 53127, Bonn, Germany 2. Department of Hematology, Hemostasis, Oncology and Stem Cell Transplantation, Hannover Medical School, Hannover, Germany 3. Division of Haematology, University Clinic Zurich, Zurich, Switzerland 4. Coagulation Center Rhein-Ruhr, Duisburg, Germany 5. Center for Coagulation Disorders, Leipzig, Germany 6. Department for Internal Medicine, Angiology, Hemostaseology and Pulmonology, Vivantes Hospital in Friedrichshain, Berlin, Germany
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Abstract: | Mild FXIII deficiency is an under-diagnosed disorder because the carriers of this deficiency are often asymptomatic and reveal a phenotype only under special circumstances like surgery or induced trauma. Mutational reports from this type of deficiency have been rare. In this study, we present the phenotypic and genotypic data of nine patients showing mild FXIII-A deficiency caused by eight novel heterozygous missense mutations (Pro166Leu, Arg171Gln, His342Tyr, Gln415Arg, Leu529Pro, Gln601Lys, Arg703Gln and Arg715Gly) in the F13A1 gene. None of these variants were seen in 200 healthy controls. In silico structural analysis of the local wild-type protein structures (activated and non-activated) from X-ray crystallographic models downloaded from the protein databank identified potential structural/functional effects for the identified mutations. The missense mutations in the core domain are suggested to be directly influencing the catalytic triad. Mutations on other domains might influence other critical factors such as activation peptide cleavage or the barrel domain integrity. In vitro expression and subsequent biochemical studies in the future will be able to confirm the pathophysiological mechanisms proposed for the mutations in this article. |
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