21-基酶缺乏的基因型和表型:来自印度西部的一个单一中心的经验
Manjiri Karlekar1, Rohit Barnabas1, Vijaya Sarathi2
1Department of Endocrinology, Seth G.S. Medical College and KEM Hospital, Mumbai, Maharashtra, India.
Indian pediatrics
|July 25, 2024
概括
印度21-基酶缺陷的遗传分析显示了常见的突变,如删除/大基因转换 (Del/LGC) 和反复变异,非经典先天性上腺增生率低.
科学领域:
- 遗传学 遗传学 是一个
- 内分泌学 在内分泌学.
- 儿科内分泌学 儿科内分泌学
背景情况:
- 21-基酶缺乏是先天性上腺增生症 (CAH) 的常见原因.
- 了解基因型-表型相关性对于诊断和管理至关重要.
- 突变流行率的区域差异需要进行本地研究.
研究的目的:
- 鉴定21-基酶缺乏症的印度患者的基因型-表型关系.
- 为了确定这个人群中不同CAH表型的频率.
- 在CYP21A2基因中识别流行和新型突变.
主要方法:
- 对临床和生化诊断的21-基酶缺乏症患者的未来招募.
- 将其分为盐浪费 (SW),简单病毒化 (SV) 和非经典 (NC) 类型的表型.
- 使用向测序和多重结合依赖探针放大 (MLPA) 的基因分析. CYP21A2基因.
主要成果:
- 分析了80名试验者 (64名XX),其中41名SW,34名SV和5名NC表型.
- 在158/160个等位基因中发现的致病突变.
- 常见的突变包括Del/LGC (25.6%),p.293-13A/C>G (22.5%),以及p.Ile173Asn (18.75%).这些突变是最常见的.
- 罕见的复发突变c.-113G>A+p.Pro31Leu (6.87%) 和p.Phe405Ser (2.5%) 表明存在创始人效应.
- 发现了两种新型变体 (p.Leu49Arg,p.Leu362Ter),预计酶活性较低.
- 显而易见的是,exon 6集群突变和p.Val282Leu缺席.
结论:
- 删除/大基因转换 (Del/LGC) 是这个印度队列中最常见的突变.
- 经常出现的变体c.-113G>A+p.Pro31Leu和p.Phe405Ser可能表明创始人效应.
- 这项研究证实,印度人群中非经典CAH的患病率很低.
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