通过LINE1介导的雄激素受体转录的表观遗传抑制导致雄激素不敏感综合征
Jelena Pozojevic1, Radhika Sivaprasad2, Joshua Laß3
1Institute of Human Genetics, University of Lübeck and University Hospital Schleswig-Holstein, Lübeck, Germany. jelena.pozojevic@uksh.de.
Scientific reports
|July 15, 2024
概括
确定了一种导致雄激素不敏感综合征 (AIS) 的新病因:LINE1逆转移素插入雄激素受体 (AR) 基因. 这种插入会破坏AR功能,导致46,XY个体的低病毒化.
科学领域:
- 遗传学和分子生物学
- 内分泌学 在内分泌学.
- 生殖医学 生殖医学
背景情况:
- 雄激素不敏感综合征 (AIS) 是46,XY个体的性发育障碍 (DSD),其信号受体 (AR) 信号受损.
- AR基因的突变是AIS的经典原因,但很大一部分患者缺乏已识别的AR突变.
- 移动遗传元素,如逆转移体,越来越多地被认为是人类遗传疾病的贡献者.
研究的目的:
- 为了研究AIS的遗传基础,在一个患有46,XY karyotype和 undervirilized 生殖器的病人,谁缺乏可检测的AR基因突变.
- 确定导致雄激素不敏感综合征的新型遗传机制.
- 探索逆转移子插入在人类疾病发病过程中的作用.
主要方法:
- 进行了整体外体序列测序 (WES) 进行遗传诊断.
- 长读纳米孔测序被用于表征已识别的插入.
- 进行了DNA甲基化分析和AR转录和患者衍生性生殖器皮肤纤维细胞 (GSF) 中蛋白质水平的评估.
主要成果:
- 在AR基因的5'未翻译区域 (5'UTR) 中发现了一种由母亲遗传的LINE1 (L1) 逆转移子插入.
- 插入,一个大约2.7kb的截断的L1元素,通过长读序列确认.
- 在患者衍生的GSF中观察到L1插入部位的DNA甲基化增加和AR转录和蛋白质水平降低,证实了AIS.
结论:
- 这项研究确定了LINE1逆转移素插入AR基因的LINE1逆转移素插入是导致雄激素不敏感综合征 (AIS) 的新病因.
- 这些发现突显了逆转移子在引起人类遗传疾病中的重要作用,扩大了AIS已知的病因谱.
- 这一案例强调了在诊断DSD时考虑非经典遗传机制的重要性,包括移动元素插入.
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