一种拼接区域变异导致GNAS失活障碍的非典型呈现
Brandon S Stone1,2, Swetha Ramadesikan3, Regan McGinley1
1Division of Genetic and Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio, USA.
American journal of medical genetics. Part A
|June 2, 2025
概括
在母亲和女儿身上发现了GNAS基因的新型拼接变异,导致了独特的表型. 这一发现扩大了已知的GNAS相关疾病和它们的遗传基础的范围.
科学领域:
- 遗传学 遗传学 是一个
- 分子生物学分子生物学
- 内分泌学 在内分泌学.
背景情况:
- 在GNAS基因的致病变体与各种疾病有关,包括伪低甲状腺症和麦库恩-阿尔布赖特综合征.
- GNAS位点印记和原产地父效应影响疾病表现.
- 功能丧失的变体通常在母性等位基因上引起荷尔蒙抵抗,肥胖和认知问题.
研究的目的:
- 在一个母亲和女儿中发现的独特的GNAS拼接变体的特征.
- 研究这种新型变异的分子机制和表型后果.
- 扩大对GNAS相关疾病的理解.
主要方法:
- RNA测序 (RNA-seq) 来检测替代拼接.
- 分离分析以确定变异遗传.
- 逐步确定变种的父母来源.
主要成果:
- 在一个母亲和女儿身上,在GNAS第5个外显子附近发现了一种de novo剪接变体 (c.432+5G>A).
- RNA-seq证实了替代拼接,可能导致功能丧失效应.
- 这种变异分离出了不同的表型:SHOX缺陷类疾病与母亲的马德隆形,以及女儿的增长限制与胸.
结论:
- 鉴定到的GNAS拼接变异扩大了GNAS失活障碍的表型谱.
- 这一案例凸显了考虑非典型GNAS变体及其多样化的临床表现的重要性.
- 父代基因参与和独特的表型强调了GNAS印记和变异效应的复杂性.
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