一种经常出现的拼接变体揭示了在一个独特的大队列中11β-基酶缺乏的情况
Clément Janot1,2,3, Delphine Mallet1, Alexandre Janin1,4
1Hospices Civils de Lyon, LBMMS, Service de Biochimie et Biologie moléculaire, Centre de Biologie et de Pathologie Est, Bron cedex F-69677, France.
The Journal of clinical endocrinology and metabolism
|August 19, 2025
概括
在11β-基酶缺乏 (11βOHD) 患者中发现了一种新型拼接变体c.954+148C>G. 这种复发的变异破坏了拼接,与严重突变相比,与较轻微的临床特征有关.
科学领域:
- 内分泌学 在内分泌学.
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
背景情况:
- 先天性上腺增生 (CAH) 可能是由于11β-基酶缺乏 (11βOHD) 的结果.
- 虽然零星病例很常见,但11βOHD种群的综合分子数据往往有限.
研究的目的:
- 在特定的队列中描述11βOHD的遗传景观.
- 为了识别和功能验证CYP11B1基因中的新型,复发性拼接变体.
主要方法:
- 在1990年至2024年期间,对250名被诊断为11βOHD的患者进行了CYP11B1基因测序.
- 一种深度内基变异 (NM_000497.4(CYP11B1):c.954+148C>G) 被识别并使用in silico分析和Minigene Reporter Assay进行功能评估.
- 分析了基因型-表型相关性,将新型变异患者与严重突变患者进行比较.
主要成果:
- 发现c.954+148C>G变体是复发的,在44名患者中存在.
- 功能性研究证实,这种变体通过激活一个神秘的供体拼接部位来破坏正常拼接.
- 与携带c.954+148C>G变异的患者相比,与携带严重变异的患者相比,他们表现出明显较低的类固醇前体水平和延迟的青春期发作.
结论:
- 这项研究为11βOHD队列提供了广泛的遗传数据,确定c.954+148C>G是被研究的高加索人群中最常见的变异.
- 这些发现凸显了深层内区域对诊断变异的查的重要性.
- 将体外功能测定与遗传查相结合,对于防止11βOHD的诊断遗漏至关重要.
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