人类胰腺小岛的综合性单细胞多基因分析识别了与T1D相关的基因和调控信号
Ricardo D'Oliveira Albanus1, Xiaoshan Zhang2, Zeping Zhao2
1Gilbert S. Omenn Department of Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI, USA.
Cell reports
|July 30, 2025
概括
这项研究整合了多原子数据,以精确确定胰腺β细胞中与1型糖尿病 (T1D) 风险信号相关的基因和调控元素. 它确定了增加β细胞脆弱性的特定遗传变异,为T1D提供了新的机制性见解.
科学领域:
- 免疫学 免疫学 免疫学
- 遗传学 是一个遗传学.
- 内分泌学 在内分泌学.
背景情况:
- 全基因组关联研究 (GWAS) 已经确定了许多1型糖尿病 (T1D) 风险位,但将这些信号转化为生物机制仍然是一个挑战.
- 了解涉及T1D病变的特定细胞类型,因果变异和向基因对于开发有效疗法至关重要.
研究的目的:
- 对人类胰腺小岛进行全面的多原子整合性分析,以确定与T1D GWAS信号相关的细胞类型,调节元件和基因.
- 用同源模型功能验证已识别的T1D风险基因和调控区域在β细胞功能和生存中的作用.
主要方法:
- 在基线和T1D刺激条件下对人类胰腺小岛进行单细胞/核RNA测序和ATAC-seq.
- 用T1D GWAS总结统计数据对多组数据进行整合性分析,以提名效应细胞类型和候选基因/调控元素.
- 使用同源人类胚胎干细胞 (hESC) 和衍生的β类细胞进行功能验证,包括CRISPR-Cas9基因编辑和分子分析 (RNA-seq,ATAC-seq).
主要成果:
- 指定所有T1D GWAS信号的效应细胞类型,并确定通过β细胞作用的三种T1D信号 (DLK1/MEG3,RASGRP1,TOX) 的调节元件和基因.
- 功能验证表明,RASGRP1或DLK1的丧失,或它们的调节区域的破坏,会增加β细胞亡.
- 携带DLK1附近的T1D风险等位基因 (rs3783355) 的同源hESC表现出β细胞死亡的增加,并且在RASGRP1-/-和DLK1-/-β类细胞中增加了5个基因.
结论:
- 这种综合性方法成功地将T1D GWAS信号与胰腺小岛微环境中的特定细胞类型,基因和调控元素联系起来.
- 这些发现提供了关键的机制性见解,了解遗传风险变异如何导致1型糖尿病中的β细胞功能障碍和亡.
- 这项研究强调了结合单细胞多组学,GWAS数据和同位素hPSC模型的实用性,以剖析复杂疾病的发病因子.
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