在受刺激的iPSC衍生的巨细胞中基因表达QTL映射提供了对常见复杂疾病的洞察力
Nikolaos I Panousis1, Omar El Garwany1, Andrew Knights1
1Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, UK.
Nature communications
|August 27, 2025
概括
与疾病相关的许多遗传变异可能会在特定情况下调节基因表达,比如刺激免疫细胞. 这项研究揭示了特定条件的调控变异 (reQTL) 对理解常见疾病风险等位基因至关重要.
科学领域:
- 基因组学
- 免疫学
- 系统生物学
背景情况:
- 许多与疾病相关的变异是监管性的,但未被列在表达量特征位置 (eQTL) 数据库中.
- 假设:这些变异可能会在特定的生物环境中调节基因表达,例如刺激免疫细胞.
研究的目的:
- 使用人类iPSC衍生的巨细胞对24个细胞条件进行eQTL映射.
- 调查特定疾病调控变异 (reQTL) 在疾病关联中的作用.
- 在GWAS位点识别新的疾病因子基因.
主要方法:
- 使用人类诱导多能干细胞 (iPSC) 衍生的巨细胞.
- 在24个不同的细胞条件中映射eQTL,包括原始和刺激状态.
- 应用局部化分析以将基因变异与基因表达和疾病关联.
主要成果:
- 在刺激条件下检测到的eQTL的76%也存在于原始细胞中.
- 响应eQTLs (reQTLs) 的比例在不同疾病中显著不同 (3.7% - 28.4%).
- 疾病特异性reQTL虽然罕见 (1.11%),但在疾病定位的eQTL中增强.
- 通过reQTL局部化在GWAS位点发现了额外的21. 7%的疾病效应基因,其中38. 6%未在基因型-组织表达 (GTEx) 目录中发现.
结论:
- 特定病情的规范变化在常见疾病风险中起着重要作用.
- 在刺激的免疫细胞中绘制eQTL可以提高与疾病相关的调节变异的识别.
- 这种方法扩大了对基因表达和疾病病因学的遗传影响的理解.
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