ASH1L内基切除的淋巴体马赛克制造了MRD52和1q22微切除之间的桥梁
Ester Di Muro1, Antonio Petracca1, Marco Castori1
1Division of Medical Genetics, Fondazione IRCCS-Casa Sollievo della Sofferenza, Foggia, Italy.
American journal of medical genetics. Part A
|December 10, 2024
概括
ASH1L基因变异导致一种罕见的神经发育障碍. 这项研究确定了ASH1L删除的淋巴体马赛克,这表明在看似零星的病例中存在复发风险.
科学领域:
- 遗传学 遗传学 是一个
- 神经发育障碍 神经发育障碍
背景情况:
- ASH1L基因编码了一个对大脑发育至关重要的基因组 lysine 甲基转移酶.
- 在ASH1L中功能丧失的变体与一种超罕见的神经发育障碍 (前MRD52) 有关.
- 包含ASH1L的1q22微切除也与这种疾病有关.
研究的目的:
- 在三个兄弟姐妹中调查非综合征性智力障碍 (ID) 的遗传基础.
- 划出影响ASH1L的1q22微删除重叠的最小区域.
- 为了确定一种有害的ASH1L变体的第一个淋巴体马赛克的例子.
主要方法:
- 使用SNP-array分析检测ASH1L基因内的内基因缺失.
- 分析了父母的DNA,以调查遗传模式和识别马赛克主义.
- 为了进行比较分析,进行了文献和数据库 (DECIPHER) 审查.
主要成果:
- 三个兄弟姐妹呈现出非综合征性ID和相同的内基因ASH1L删除 (外因子2-12).
- 父母是非携带者,这表明父母之一的淋巴体或恶性体马赛克.
- 这一发现将1q22微删除的关键区域缩小到ASH1L,并将MRD52与1q22微删除表型统一起来.
结论:
- 这项研究证实ASH1L是ID特征的特定神经发育障碍的致病基因.
- 对ASH1L缺失的淋巴体马赛克的鉴定凸显了在显然零星的病例中复发的可能性.
- 对于患有ID和1q22微切除或ASH1L变异的患者,应考虑ASH1L相关的神经发育障碍.
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