一个非综合征性口腔裂风险位将tRNA拼接缺陷与神经细胞病理联系起来
Michaela Bartusel1, Skylar X Kim2, Rizwan Rehimi3
1Department of Biology, Massachusetts Institute of Technology, Cambridge, MA, USA; Center for Molecular Medicine Cologne (CMMC), University of Cologne, Cologne, Germany.
American journal of human genetics
|April 18, 2025
概括
遗传和环境因素有助于形成面孔裂. 这项研究揭示了神经细胞中tRNA拼接受损,影响面发育,并将DDX1确定为危险因素.
科学领域:
- 遗传学 遗传学 是一个
- 发展生物学 发展生物学
- 分子生物学分子生物学
背景情况:
- 面腔裂是常见的先天性出生缺陷,具有多因素的病因.
- 大多数口腔裂的分子基础仍然不太清楚.
- 识别遗传和环境风险因素对于了解疾病机制至关重要.
研究的目的:
- 为了分子剖析与非综合征性口腔裂风险相关的基因组位置.
- 研究DDX1在面发育和神经细胞功能中的作用.
- 阐明将tRNA拼接缺陷与面腔裂病原性联系起来的分子机制.
主要方法:
- 综合的全基因组关联研究,有针对性的再测序和表观基因组分析.
- 在人类胚胎面组织中绘制了风险相关增强剂 (e2p24.2) 的长距离相互作用.
- 利用胚胎模型和神经细胞 (cNCC) 的体外研究来评估基因功能和分子通路.
主要成果:
- 确定了一种在胚胎面组织中活跃的增强剂 (e2p24.2),与含有MYCN和DDX1.1的域相互作用.
- 证明DDX1,一个tRNA拼接因子,对面发育和cNCC迁移至关重要.
- 表明DDX1损失导致tRNA处理缺陷,核糖体停滞和蛋白质合成受损,足以破坏面发育.
结论:
- 在cNCC中受损的tRNA拼接是一种新的分子机制,有助于 orofacial 裂.
- MYCN,DDX1和tRNA处理缺陷被确定为 orofacial裂病原发生的危险因素.
- 这项研究提供了对非综合征性口腔口腔裂的分子理解,将遗传变异与发育过程联系起来.
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