[罕见的VPS33B基因突变与GP1BA突变相结合导致血VWF水平严重下降:病例报告和文献综述]
1Department of hematology, Dushu Lake Hospital Affiliated to Soochow University, Suzhou 215028, China.
Zhonghua xue ye xue za zhi = Zhonghua xueyexue zazhi
|August 12, 2024
概括
一种由双基因变异引起的罕见遗传疾病导致孕妇威尔布兰德因子 (VWF) 水平极低. 这一发现突出了出血障碍的新遗传原因.
科学领域:
- 遗传学 是一个遗传学.
- 血液学 血液学 血液学
- 生殖医学 生殖医学
背景情况:
- 在一名孕妇中发现了严重缺乏凝血因子VIII活性 (FVIIIC) 和·维勒布兰德因子抗原 (VWFAg) (<1%).
- 对VWF基因外型的初始遗传测试没有发现致病变异,临床表现不典型的类型III血友病 (·维勒布兰德病).
研究的目的:
- 在孕妇和她的家人中调查严重VWF缺乏症的遗传基础.
- 识别导致出血障碍的新型遗传变异.
主要方法:
- 在患者及其家人身上使用第三代测序技术进行了全基因组测序.
- 对VPS33B和GP1BA基因中的遗传变异进行分析.
- 鉴定变异与VWF水平和临床表型的相关性.
主要成果:
- 在VPS33B (c.869G>C) 中的异合体变体在多个父系家庭成员中被确定,与降低的VWF水平 (39%-56%) 相关.
- 试验对象还携带了GP1BA (c.1474dupA) 的异合体变异,被归类为与血小板类型的伪VWD相关.
- 这是第一份国际报告,显示VWF水平因异构卵性VPS33B变异而下降,也是第一份报告显示VWF严重减少的病例,来自VPS33B和GP1BA双重异构卵性变异.
结论:
- 在VPS33B和GP1BA的双异构变异可以导致血VWF水平的严重下降.
- VPS33B变种代表了新发现的VWF水平降低的遗传原因.
- 超越VWF基因外基因的基因研究对于诊断复杂的出血障碍至关重要.
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