临床外体测序作为一个关键的诊断工具:在双胞胎双胞胎中一种罕见的新生Trio变异
Hicham Bouchahta1,2, Maryem Sahli2, Nada Amllal3
1Microbiology and Molecular Biology Team, Center of Plant and Microbial Biotechnology, Biodiversity and Environment, Faculty of Sciences, Mohammed V University in Rabat, Rabat, Morocco.
Molecular syndromology
|February 9, 2026
概括
研究了双胞胎双胞胎中与TRIO相关的神经发育障碍. 临床外体序列测定确定了一种致病性TRIO基因变异,这表明这些罕见遗传疾病的父母中存在潜在的马赛克事件.
科学领域:
- 遗传学 是一个遗传学.
- 神经科学是一个神经科学.
- 发展生物学 发展生物学
背景情况:
- 与TRIO相关的神经发育障碍是一种罕见的遗传疾病.
- TRIO基因中的致病变体与神经元发育有关,并且经常表现出自体主导遗传.
- 在双胞胎双胞胎中发生的新发病很少发生,并未得到充分了解.
研究的目的:
- 研究双胞胎双胞胎神经发育障碍的遗传基础.
- 为了识别与罕见的神经发育状况相关的TRIO基因中的致病变体.
- 在家族病例中探索潜在的遗传模式,包括马赛克主义.
主要方法:
- 临床外体序列测序 (CES) 是对双胞胎双胞胎姐妹进行的,这些双胞胎姐妹呈现神经发育迟缓,智力障碍,行为问题和小头.
- 使用桑格测序的分离分析被用来检查父母的遗传模式.
- 评估了鉴定变异对GEF对Rac1活动的功能影响.
主要成果:
- 在TRIO基因的GEFD1域中发现了一种致病性误解变异 (c.4283G>A,p.Arg1428Gln).
- 众所周知,这种变异会损害对Rac1的GEF活性,影响关键的神经元信号通路.
- 通过桑格测序在父母身上没有检测到这种变异,留下了父母的生殖系或早期的后阴茎马赛克主义作为潜在的解释.
结论:
- 临床外体序列测序对于诊断罕见的神经发育障碍非常有价值.
- 一个合理的,虽然未被证明的,父母的生殖系或早期的阴囊后马赛克事件被建议.
- 可能需要进一步的研究,以最终排除马赛克主义和其他遗传解释.
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