对逃脱无意中介衰变的变体进行系统分析,揭示了候选孟德尔病
Rebecca I Torene1, Maria J Guillen Sacoto2, Francisca Millan2
1GeneDx, Gaithersburg, MD, USA; Geisinger, Danville, PA, USA.
American journal of human genetics
|December 13, 2023
概括
脱离无意中介衰变 (NMD) 的蛋白质缩减变体可以导致罕见疾病. 这项研究通过分析神经发育障碍三组中的这些变异来确定与疾病相关的新基因.
科学领域:
- 遗传学 遗传学 是一个
- 基因组学就是基因组学.
- 人类遗传学 人类遗传学
背景情况:
- 在基因3'末端附近的蛋白质截断变体 (PTV) 可能会逃避无意中介衰变 (NMD).
- 这些脱离NMD的PTVs (PTVescs) 可以导致门德尔病,但由于对蛋白质功能的可变影响,它们的解释具有挑战性.
- 之前对PTVesc负担的研究是有限的,需要对罕见疾病进行大规模评估.
研究的目的:
- 系统地识别和分析PTVesc de novo突变 (DNMs) 在一个大群具有神经发育障碍 (NDDs) 个体中.
- 确定PTVescs显著丰富的基因,并评估它们在孟德尔病中的作用.
- 扩大已知的与疾病相关的基因的范围,并发现与PTVescs.cs.相关的新型基因.
主要方法:
- 从临床外基因组测序数据对29,031个NDD父子三重体进行了回顾性分析.
- 识别和统计丰富分析PTVesc DNMs.
- 对PTVescs的ClinVar变体和受影响个体的表型相关性的注释.
主要成果:
- 确定了1376个PTVesc DNM和133个显著丰富的基因 (双项p < 0.001).
- 确认已知疾病基因 (例如,SEMA6B,PPM1D,DAGLA) 并确定了22个已知的孟德尔基因,之前没有PTVesc证据.
- 发现了22个新的PTVesc丰富基因,在RAB1A,IRF2BP1和LDB1.1变异的个体中观察到表型相似性.
结论:
- 这种大规模分析扩展了已知的孟德尔病基因的突变谱.
- 确定了与PTVescs相关的新型候选基因,为罕见遗传疾病提供了新的见解.
- 强调在NDD和其他罕见疾病的遗传诊断中考虑PTVescs的重要性.
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