识别非功能性PABPC1L,导致卵细胞成熟异常和早期胚胎停产在女性初级不孕症
Xiang Wang1, Ruixi Zhou2, Xiaowei Lu3
1Department of Obstetrics/Gynecology, Key Laboratory of Obstetric, Gynecologic and Pediatric Diseases and Birth Defects of Ministry of Education, West China Second University Hospital, Sichuan University, Chengdu, China.
Clinical genetics
|September 19, 2023
概括
PABPC1L基因的突变通过破坏卵细胞成熟和早期胚胎发育,导致女性不孕. 这项研究确定了与人类这些生殖问题相关的新型PABPC1L变异.
科学领域:
- 生殖生物学 生殖生物学
- 人类遗传学 人类遗传学
- 分子生物学分子生物学
背景情况:
- 卵细胞成熟停止,受精失败和早期胚胎停止是导致女性不孕症的重要因素.
- 这些生殖失败的遗传基础,特别是关于类似于 (PABPC1L) 的多聚A结合蛋白细胞质1的遗传基础,在人类中仍然很大程度上未被阐明.
- 以前对小鼠的研究表明,PABPC1L功能丧失导致女性不孕.
研究的目的:
- 研究PABPC1L在人类女性生殖中的作用.
- 为了确定与卵细胞成熟异常和早期胚胎停止相关的PABPC1L的遗传变异.
- 阐明PABPC1L突变影响女性生育能力的分子机制.
主要方法:
- 对两名不育的雌性进行遗传分析,这些雌性有反复出现的卵细胞成熟异常和早期胚胎停止.
- 在PABPC1L基因中发现和描述突变.
- 评估PABPC1L蛋白的功能,包括mRNA结合能力,染色体配置和卵细胞中的转录活性.
主要成果:
- 发现了两种新的PABPC1L突变:一种同性误解突变 (c.536G>A,p.R179Q) 和一种复合异性突变 (c.793C>T,p.R265W;c.1201C>T,p.Q401*).
- 这些突变导致非功能性PABPC1L蛋白,导致染色质配置受损和转录沉默在生殖囊泡 (GV) 卵细胞.
- 突变PABPC1L对卵细胞成熟和早期胚胎发育至关重要的mRNA的结合显著减少.
结论:
- 在人类女性中,PABPC1L的新突变被确定为卵细胞成熟异常和早期胚胎停产的原因.
- 这些发现证实了PABPC1L在维持人类女性生育能力方面的关键作用.
- 该研究强调PABPC1L是理解和潜在治疗与卵细胞和早期胚胎发育有关的不孕症的潜在目标.
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