对唐氏综合征的全基因组关联研究与相关的先天性心脏缺陷有关
Elizabeth R Feldman1, Yunqi Li2, David J Cutler1
1Department of Human Genetics, Emory University School of Medicine, Atlanta, GA, 30322.
medRxiv : the preprint server for health sciences
|September 16, 2024
概括
遗传研究确定了与唐氏综合征 (DS) 儿童先天性心脏缺陷 (CHD) 相关的特定染色体区域. 这些发现提供了对影响DS群体心脏异常的遗传因素的见解.
科学领域:
- 遗传学 是一个遗传学.
- 心脏病学 心脏病学
- 发展生物学 发展生物学
背景情况:
- 在患有唐氏综合征 (DS) 的儿童中,先天性心脏缺陷 (CHD) 很常见,影响该人口的40-50%.
- 了解DS相关的CHD的遗传基础对于诊断和潜在的干预措施至关重要.
研究的目的:
- 研究唐氏综合征患者心血管疾病的遗传结构.
- 在DS群体中识别与特定CHD亚型相关的遗传变异.
主要方法:
- 全基因组关联研究 (GWAS) 在多民族队列的儿童中进行了DS和CHD (n=886) 与正常心脏的DS相比 (DS+NH,n=572).
- 分析的重点是常见变异 (MAF>0.05) 并按心脏病的亚型分层,包括心房间隔膜缺陷 (AVSD),心房间隔膜缺陷 (ASD) 和心室隔膜缺陷 (VSD).
- 使用复制队列 (DS+CHD: n=229; DS+NH: n=197) 来验证发现,并对暗示位置进行元分析.
主要成果:
- 没有单个核酸多态 (SNP) 达到全基因组意义,但多个位点在分析中显示出暗示意义 (p<2×10-6).
- 在1p35.1 (靠近RBBP4) 的特定位置与心房隔膜缺陷 (ASD) 风险相关.
- 在5q35.2 (靠近MSX2) 的另一个位点与任何类型的心血管疾病有关.
- 虽然在独立队列中没有SNP复制,但在元分析后,暗示性SNP通常仍然显著,表明一致的遗传信号.
结论:
- 暗示性遗传位置,包括1p35.1和5q35.2,与唐氏综合征患者的先天性心脏缺陷有关.
- 这些发现有助于了解DS群体中CHD的遗传修饰剂.
- 这些位置内的候选基因在发育中的心脏中得到表达,这需要进一步研究.
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