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Updated: Sep 9, 2025

In Vivo Modeling of the Morbid Human Genome using Danio rerio
Published on: August 24, 2013
复合异性DMC1变体因复制蛋白A的缺陷而导致非阻塞性亚精
Yan Wang1, Renxue Wang1, Ziyou Bao1
1State Key Laboratory of Reproductive Medicine and Offspring Health, Center for Reproductive Medicine, Institute of Women, Children and Reproductive Health, Shandong University, 250012, China.; National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Shandong University, Jinan, Shandong, 250012, China.; Key Laboratory of Reproductive Endocrinology (Shandong University), Ministry of Education, Jinan, Shandong, 250012, China.; Shandong Technology Innovation Center for Reproductive Health, Jinan, Shandong, 250012, China.; Shandong Provincial Clinical Research Center for Reproductive Health, Jinan, Shandong, 250012, China.; Shandong Key Laboratory of Reproductive Research and Birth Defect Prevention (Under Construction), Jinan, Shandong, 250012, China.; Research Unit of Gametogenesis and Health of ART-Offspring, Chinese Academy of Medical Sciences (No.2021RU001), Jinan, Shandong, 250012, China.
一种新型的异构体DMC1变体通过破坏半球变异导致非阻塞性亚精. 这导致缺陷的DNA修复和同源配对,在Dmc1淘汰小鼠中得到证实.
科学领域:
- 遗传学
- 生殖生物学
- 分子生物学
背景情况:
- 非阻塞性精子缺血 (NOA) 是男性不孕症的一种严重形式.
- 在精子生成过程中对同类染色体配对和DNA修复至关重要.
- 在DMC1的遗传变异可能导致变质和不孕.
研究的目的:
- 在NOA患者中调查复合异性DMC1变体如何影响同源性搜索和链侵袭.
- 阐明DMC1相关的男性不孕症背后的分子机制.
主要方法:
- 鉴定了一名患有复合异性DMC1变体和NOA的患者.
- 使用逆转录聚合酶链反应和西部斑块来评估DMC1的表达.
- 进行了组织学分析和免疫光染色以检测精子发生停止,染色体配对和DNA双链断裂修复.
- 产生Dmc1淘汰老鼠以模拟人类的表型.
主要成果:
- 患者的复合异构型DMC1变体 (c. 494+4A>G/ c. 597G>C) 与NOA相关,并且由于无意义介导的mRNA衰变导致DMC1蛋白水平降低.
- 在变过程中观察到精子发生停止,染色体配对和DNA双链断裂修复有显著的缺陷.
- Dmc1淘汰小鼠重现了人类表型,显示染色体配对和DNA修复受损.
- 在雄性精子细胞中观察到复制蛋白A (RPA) 的积累,这表明单链DNA无法被DMC1替换.
结论:
- 一种新型异构的DMC1变体破坏了生殖细胞的半转化,导致NOA.
- 这一发现扩大了与男性不孕症相关的DMC1突变的已知范围.
- 这项研究强调了DMC1在确保适当的同源重组和精子生成方面的关键作用.
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