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Novel mutation in coagulation factor VII (Carmel mutation): Identification and characterization

BACKGROUND: Measurement of factor VII (FVII) activity does not enable prediction of bleeding tendency in individuals with inherited FVII deficiency. OBJECTIVE: To characterize the molecular and functional features of FVII in a family with FVII deficiency and correlate them with the bleeding tendency...

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Autores principales: Cassel, Aliza, Rosenberg, Nurit, Muhammad, Emad, Livnat, Tami, Dardik, Rima, Berl, Miriam, Preis, Meir
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8117812/
https://www.ncbi.nlm.nih.gov/pubmed/34027285
http://dx.doi.org/10.1002/rth2.12407
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author Cassel, Aliza
Rosenberg, Nurit
Muhammad, Emad
Livnat, Tami
Dardik, Rima
Berl, Miriam
Preis, Meir
author_facet Cassel, Aliza
Rosenberg, Nurit
Muhammad, Emad
Livnat, Tami
Dardik, Rima
Berl, Miriam
Preis, Meir
author_sort Cassel, Aliza
collection PubMed
description BACKGROUND: Measurement of factor VII (FVII) activity does not enable prediction of bleeding tendency in individuals with inherited FVII deficiency. OBJECTIVE: To characterize the molecular and functional features of FVII in a family with FVII deficiency and correlate them with the bleeding tendency. PATIENTS/METHODS: We studied 7 family members with very low FVII activity using prothrombin time (PT), activated factor VII (FVIIa), FVII activity level, and thrombin generation. The factor 7 gene was sequenced and the mutation was analyzed by prediction software. RESULTS: The proband has very low FVII activity (0%–4%), with PT ranging between 5% to 18% depending on the tissue factor (TF) origin. Direct sequencing demonstrated a single homozygous nucleotide substitution G > A in exon 6, predicting a novel missense mutation Cys164Tyr. Three members of the family were found to be heterozygous carriers of this mutation. One of them was a compound heterozygote, carrying both the Cys164Tyr and Ala244Val mutation (linked to Arg353Gln polymorphism). Her FVII activity and antigen levels were 3%–7% and 8%, respectively. The other heterozygous carriers demonstrated FVII activity of 41%–54%, FVII antigen of 46%–66%, and FVIIa activity of 30%. FVIIa was undetectable in the homozygous and compound heterozygous subjects. Thrombin generation was normal in the presence of calcium, but no response to TF addition was observed in the homozygous proband, and a reduced response was observed in the compound heterozygous subject. CONCLUSION: The patient homozygous for the “Carmel” mutation has mild clinical manifestations despite very low FVII activity, which correlates with thrombin generation results.
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spelling pubmed-81178122021-05-20 Novel mutation in coagulation factor VII (Carmel mutation): Identification and characterization Cassel, Aliza Rosenberg, Nurit Muhammad, Emad Livnat, Tami Dardik, Rima Berl, Miriam Preis, Meir Res Pract Thromb Haemost Original Articles BACKGROUND: Measurement of factor VII (FVII) activity does not enable prediction of bleeding tendency in individuals with inherited FVII deficiency. OBJECTIVE: To characterize the molecular and functional features of FVII in a family with FVII deficiency and correlate them with the bleeding tendency. PATIENTS/METHODS: We studied 7 family members with very low FVII activity using prothrombin time (PT), activated factor VII (FVIIa), FVII activity level, and thrombin generation. The factor 7 gene was sequenced and the mutation was analyzed by prediction software. RESULTS: The proband has very low FVII activity (0%–4%), with PT ranging between 5% to 18% depending on the tissue factor (TF) origin. Direct sequencing demonstrated a single homozygous nucleotide substitution G > A in exon 6, predicting a novel missense mutation Cys164Tyr. Three members of the family were found to be heterozygous carriers of this mutation. One of them was a compound heterozygote, carrying both the Cys164Tyr and Ala244Val mutation (linked to Arg353Gln polymorphism). Her FVII activity and antigen levels were 3%–7% and 8%, respectively. The other heterozygous carriers demonstrated FVII activity of 41%–54%, FVII antigen of 46%–66%, and FVIIa activity of 30%. FVIIa was undetectable in the homozygous and compound heterozygous subjects. Thrombin generation was normal in the presence of calcium, but no response to TF addition was observed in the homozygous proband, and a reduced response was observed in the compound heterozygous subject. CONCLUSION: The patient homozygous for the “Carmel” mutation has mild clinical manifestations despite very low FVII activity, which correlates with thrombin generation results. John Wiley and Sons Inc. 2021-02-25 /pmc/articles/PMC8117812/ /pubmed/34027285 http://dx.doi.org/10.1002/rth2.12407 Text en © 2021 The Authors. Research and Practice in Thrombosis and Haemostasis published by Wiley Periodicals LLC on behalf of International Society on Thrombosis and Haemostasis. https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ (https://creativecommons.org/licenses/by-nc-nd/4.0/) License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
spellingShingle Original Articles
Cassel, Aliza
Rosenberg, Nurit
Muhammad, Emad
Livnat, Tami
Dardik, Rima
Berl, Miriam
Preis, Meir
Novel mutation in coagulation factor VII (Carmel mutation): Identification and characterization
title Novel mutation in coagulation factor VII (Carmel mutation): Identification and characterization
title_full Novel mutation in coagulation factor VII (Carmel mutation): Identification and characterization
title_fullStr Novel mutation in coagulation factor VII (Carmel mutation): Identification and characterization
title_full_unstemmed Novel mutation in coagulation factor VII (Carmel mutation): Identification and characterization
title_short Novel mutation in coagulation factor VII (Carmel mutation): Identification and characterization
title_sort novel mutation in coagulation factor vii (carmel mutation): identification and characterization
topic Original Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8117812/
https://www.ncbi.nlm.nih.gov/pubmed/34027285
http://dx.doi.org/10.1002/rth2.12407
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