在46XY性发育障碍的兄弟姐妹中鉴定了SRD5A2基因的罕见变异
Leena Rawal1, Deepak Panwar2,3, Ravinder Kumar1
1Department of Clinical Cytogenomics, National Reference Laboratory, Dr. Lal PathLabs Ltd., Block E, Sector 18, Rohini, New Delhi 110085, India.
Case reports in genetics
|November 10, 2025
概括
基因检测对于在46,XY个体中诊断性发育障碍 (DSD) 至关重要. 这项研究在患有DSD的兄弟姐妹中发现了一种致病性SRD5A2基因变异,强调了分子诊断的重要性.
科学领域:
- 遗传学 遗传学 是一个
- 内分泌学 在内分泌学.
- 分子生物学分子生物学
背景情况:
- 在SRD5A2基因编码的类固醇5α-减少酶-2,必要的转化丸激素dihydrotestosterone.
- 这种酶的缺乏会导致46,XY性发育障碍 (DSD) 与模两可的生殖器官.
- 分子遗传检测对于诊断DSD至关重要,特别是在兄弟姐妹中.
研究的目的:
- 强调分子遗传测试在诊断兄弟姐妹中DSD方面的作用.
- 在46,XY DSD.患者中识别SRD5A2基因中的遗传变异.
- 使用生物信息学工具评估已识别的变种的致病潜力.
主要方法:
- 综合生化,细胞遗传和分子检测,包括荷尔蒙测定,染色体分析,FISH和整个外体序列 (WES).
- 桑格测序以确认已识别的变种.
- 生物信息学分析以预测变异对蛋白质结构和稳定性的影响.
主要成果:
- 生物化学测试显示,/二二的比例非常高 (45.4和43.2).
- 细胞遗传学分析证实了46,XY型与SRY基因的存在.
- 在SRD5A2基因中,WES发现了一种致病性同卵性c.737G>A(p.Arg246Gln) 变异,由桑格测序和生物信息学分析证实.
结论:
- 为了诊断46,XY DSD,必须进行全面的分子测试.
- 遗传洞察力对于管理46,XY DSD.患者具有重要意义.
- 在具有相同SRD5A2变异的兄弟姐妹中存在表型变异性,需要早期基因检查和多学科护理.
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