新型PNLDC1突变是人类和小鼠非阻塞性亚精的基础
Meftah Uddin1, Li Ming1, Feng Wan2,3,4
1Institute of Health and Medicine, Hefei Comprehensive National Science Center, Hefei National Laboratory for Physical Sciences at Microscale, School of Basic Medical Sciences, Biomedical Sciences and Health Laboratory of Anhui Province, Division of Life Sciences and Medicine, University of Science and Technology of China, 443 Huangshan Road, Hefei, Anhui Province 230027, China.
Human molecular genetics
|August 25, 2025
概括
在PNLDC1中发生的突变会破坏piRNA生物发生,导致男性不育和非阻塞性亚精. 一个Pnldc1小鼠模型证实了这些发现,显示精子生成受损和逆转移素减压.
科学领域:
- 遗传学
- 生殖生物学
- 分子生物学
背景情况:
- 与PIWI相互作用的RNAs (piRNAs) 对于生殖细胞的发育和可移植元素的沉默至关重要.
- PNLDC1蛋白对piRNA成熟至关重要,其破坏与男性不孕症有关.
- 非阻塞性精子缺血 (NOA) 是男性不孕症的一种严重形式,具有复杂的遗传基础.
研究的目的:
- 研究PNLDC1突变在人类非阻塞性精症 (NOA) 中的作用.
- 通过小鼠模型功能验证PNLDC1突变对piRNA生物生成和精子生成的影响.
主要方法:
- 在NOA患者中识别PNLDC1突变的整体外体序列.
- 在患者丸中分析PNLDC1mRNA和蛋白质表达.
- 使用CRISPR/Cas9生成和描述Pnldc1淘汰小鼠模型.
- 在小鼠模型中评估piRNA生物发生,逆转移素LINE1表达和精子亡.
主要成果:
- 在中国和巴基斯坦的NOA患者中发现了复合异构和同构PNLDC1突变.
- 观察到患者丸中没有PNLDC1蛋白质,细胞系中没有截断蛋白质.
- 由于精子生成停止,Pnldc1淘汰小鼠表现出不孕症,反映出人类的NOA.
- 鼠标模型显示LINE1逆转移体的抑制和精子亡的增加.
结论:
- PNLDC1突变扰乱了piRNA生物发生,损害了精子发生并导致人类的NOA.
- Pnldc1小鼠模型有效地回顾了人类NOA的关键方面,验证了PNLDC1的关键作用.
- 这些发现强调PNLDC1是男性不孕症的重要遗传因素.
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