PLOS GENET:青光眼背后的遗传机制被发现了

2020-05-01 MedSci原创 MedSci原创

目前估计全球有50%的青光眼失明是由原发性闭角型青光眼(PACG)引起的,但其致病基因尚不清楚。

目前估计全球有50%的青光眼失明是由原发性闭角型青光眼(PACG)引起的,但其致病基因尚不清楚。

最近,研究人员利用基因联动和全基因组测序,确定了精子生成相关蛋白13,SPATA13(NM_001166271;NP_001159743,SPATA13异构体I),也称为ASEF2(Adenomatous polyposis coli-stimulated guanine nucleotide exchange factor 2),是PACG的致病基因。该基因在一个庞大的七代英国白人家庭中表现出了不同的表达和不完全的穿透性。

其中,一个9bp的缺失,c.1432_1440del;p.478_480del,在所有受影响的角膜闭合症个体中都存在。

研究人员发现,该转录本在来自人类组织的细胞系中,以及在虹膜、视网膜、视网膜色素和睫状上皮、角膜和晶状体中广泛表达。研究人员还在189个不相关的PACS/PACS/PACG样本的队列中发现了SPATA13的8个额外突变。

该基因编码了一个含有1277个氨基酸残基的蛋白,该蛋白定位到细胞核,与核斑点部分共定位。在进行有丝分裂的细胞中,SPATA13异构体I成为着丝粒复合体的一部分,与两个着丝粒标志物--polo like kinetochore markers 1(PLK-1)和CENP-E(CENP-E)共定位。

本研究中报道的9bp缺失增加了RAC1依赖性鸟嘌呤核苷酸交换因子(GEF)活性。在本研究中发现的其他三个变体中也观察到了GEF活性的增加。

综合起来,这些数据表明,SPATA13参与有丝分裂的调控,而突变会干扰GEF活性,影响GEF高度表达的组织中的稳态,影响PACG的发病机制。

 

原始出处:

Naushin H. Waseem et al. Mutations in SPATA13/ASEF2 cause primary angle closure glaucoma, PLOS Genetics (2020). DOI: 10.1371/journal.pgen.1008721

 

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    2021-03-17 330911029

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    2021-04-10 cy0324
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    2020-06-16 canlab
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    2020-05-01 肿肿

    机制研究离临床仍然有距离,不过与临床结合思考,仍然有帮助的,不能仅仅是纯临床思维,转化思维同样重要

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