偏心逆转扰乱了SHANK2基因的发生
Jolien Huyghebaert1, Bregje Christiaenssen1, Marjan De Rademaeker2
1Department of Medical Genetics, University of Antwerp, Antwerp, Belgium.
European journal of medical genetics
|March 8, 2025
概括
在一个发育迟缓的女孩身上发现了11号染色体上的大量染色体逆转. 这一遗传发现,破坏了SHANK2基因,为她的神经发育障碍 (NDD) 提供了可能的分子诊断.
科学领域:
- 遗传学和基因组学 遗传学和基因组学
- 神经发育障碍 神经发育障碍
- 分子诊断学 分子诊断
背景情况:
- 智力障碍 (ID),言语和语言延迟,运动发育延迟和注意力缺陷多动性障碍 (ADHD) 都可能出现复杂的遗传病因.
- 均衡的de novo偏心逆转是一种结构变异,可以破坏基因功能并导致各种表型.
- SHANK2基因在突触功能中发挥着关键作用,并与神经发育障碍 (NDD) 有关.
研究的目的:
- 为了确定11号染色体上大型de novo偏心反转的精确断点.
- 调查患者神经发育表型的潜在遗传原因,包括轻度智力障碍,言语和语言延迟,运动发育延迟和ADHD.
- 为了确定所识别的逆转是否会破坏与神经发育障碍相关的任何关键基因.
主要方法:
- 使用了短读全基因组测序 (WGS) 的组合,用Delly软件进行分析.
- 使用Bionano技术进行细胞基因组分析,用于高分辨率绘制.
- 使用桑格测序进行精确的遗传表征,确认了断点.
主要成果:
- 在11号染色体 (inv11q13.3;q25) 上发现了一个平衡的de novo偏心反转,跨越大约64 Mb.
- 发现反向断点破坏了SHANK2基因,这对后突触支架蛋白质至关重要,以及LINC02714长非编码RNA (lncRNA).
- 没有发现其他可以解释患者表型的遗传变异.
结论:
- 综合基因组技术成功地确定了大型染色体逆转的断点.
- 由于逆转SHANK2基因的破坏被提出为患者神经发育障碍的可能分子原因.
- 这项研究强调了整合多种测序和细胞基因组方法用于诊断复杂遗传疾病的重要性.
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