Founder von Willebrand factor haplotype associated with type 1 von Willebrand disease.
نویسندگان
چکیده
To date, no dominant mutation has been identified in a significant proportion of patients with type 1 von Willebrand disease (VWD). In this study, we examined 70 families as part of the Canadian Type 1 VWD Study. The entire VWF gene was sequenced for 1 index case, revealing 2 sequence variations: intron 30 (5312-19A>C) and exon 28 at Tyr1584Cys (4751A>G). The Tyr1584Cys variation was identified in 14.3% (10 of 70) of the families and was in phase with the 5312-19A>C variation in 7 (10.0%) families. Both variants were observed in 2 of 10 UK families with type 1 VWD, but neither variant was found in 200 and 100 healthy, unrelated persons, respectively. Mean von Willebrand factor antigen (VWF:Ag), VWF ristocetin cofactor (VWF:RCo), and factor VIII coagulant activity (FVIII:C) for the index cases in these families are 0.4 U/mL, 0.36 U/mL, and 0.54 U/mL, respectively, and VWF multimer patterns show no qualitative abnormalities. Aberrant VWF splicing was not observed in these patients, and both alleles of the VWF gene are expressed as RNA. Molecular dynamic simulation was performed on a homology model of the VWF-A2 domain containing the Tyr1584Cys mutation. This showed that no significant structural changes occur as a result of the substitution but that a new solvent-exposed reactive thiol group is apparent. Expression studies revealed that the Tyr1584Cys mutation results in increased intracellular retention of the VWF protein. We demonstrate that all the families with the Tyr1584Cys mutation share a common, evolved VWF haplotype, suggesting that this mutation is ancient. This is the first report of a mutation that segregates in a significant proportion of patients with type 1 VWD.
منابع مشابه
Genetic Analysis of 31 Swedish Type 1 von Willebrand Disease Families Reveals Incomplete Linkage to the von Willebrand Factor Gene and a High Frequency of a Certain Disease Haplotype Running Head: Genetic Analysis of von Willebrand Disease
متن کامل
Frequency Assessment of the H817Q (2451T→A) Variant of von Willebrand Gene in Individuals without Hemorrhagic Signs
Abstract Background and Aims: Von Willebrand disease is a bleeding disorder caused by quantitative or functional defects in von Willebrand factor. The disease is found in up to 1 percent of the population. The most common symptom is mucocutaneous bleeding. Recently, studies conducted on healthy people showed that the H817Q mutation that previously known to cause von Willebrand...
متن کاملMultiple Sclerosis Diagnosed in a Woman With Von-Willebrand Disease: A Case Report
Background: Von-Willebrand Disease (VWD) is the most common inherited bleeding disorder with an autosomal inheritance pattern. Multiple Sclerosis (MS) is a neurological disease, causing neurodegeneration and demyelination of the central nervous system through autoimmune mechanisms, and is a major cause of non-traumatic disabilities in youths. Some studies have shown the higher plasma activity o...
متن کاملThe role of exon 45 and 16 in the pathogenesis of Von Willebrand disease in Iranian Patients
Abstract Background Von Willebrand disease (VWD) is an autosomal recessive congenital bleeding disorder with deficiency or dysfunction of von Willebrand factor (VWF). The gene encoding for the VWF is located on chromosome 12, which is 178 Kb with 52 exons. Various mutations of this gene is responsible for the clinical features of VWD, but some single nucleotide polymorphisms make the molecu...
متن کاملA common ancestor more than 10,000 years old for patients with R854Q-related type 2N von Willebrand's disease in Italy.
The impaired capacity of von Willebrand factor to carry factor VIII is identified as type 2N von Willebrand's disease. R854Q is the most common type 2N mutation, and almost the only one identified in Italy. This aim of this study was to ascertain whether R854Q mutations in a cohort of Italian patients with type 2N von Willebrand's disease originated from a single event or recurrent events. Thir...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Blood
دوره 102 2 شماره
صفحات -
تاریخ انتشار 2003