从脏病患者的淋巴细胞转录组的分析表明APOL1风险变体影响上皮细胞
medRxiv : the preprint server for health sciences
|January 20, 2025
概括
APOL1基因变异增加了黑人脏疾病的风险. 基因表达分析揭示了涉及上皮细胞的炎症途径,这可能解释了非洲血统患者的疾病进展和缓解率降低.
科学领域:
- 遗传学和基因组学 在
- 腎臟病學 (nephrology) 是一種醫學.
- 分子生物学分子生物学
背景情况:
- 黑人个体表现出不成比例地更高的 Idiopathic proteinuric podocytopathies 的风险. 黑人个体表现出不成比例地更高的 Idiopathic proteinuric podocytopathies 的风险.
- 这种风险增加部分归因于APOL1基因内的特定风险等位基因.
- 连接APOL1风险等位基因与脏疾病的确切病原机制尚不清楚.
研究的目的:
- 为了研究 APOL1 相关性病背后的分子机制.
- 分析淋巴细胞转录组,并确定与患有异常性性综合征的患者中APOL1风险等位基因相关的基因表达模式.
- 探索APOL1风险等位基因,基因联合表达网络和临床结果之间的关系,特别是在非洲血统的人群中.
主要方法:
- 来自患有异常性性综合征的患者的质RNA测序 (RNASeq) 转录组的分析,由推断的非洲祖先 (AA) 和非非洲祖先 (noAA) 分层.
- 利用基因协同表达网络分析来识别与APOL1风险等位基因数相关的模块.
- 采用特征方向 (ChDir) 来识别基因特征,根据APOL1基因型和评估与临床结果的关联 (缓解,功能衰竭,EGFR下降) 来区分患者.
主要成果:
- 在APOL1风险等位基因数量和特定的共表达模块 (MM2) 之间发现了显著的关联,独立于eGFR和蛋白尿.
- 在非洲血统的患者中,MM2的更高激活分数和ChDir识别的1481基因特征与较低的完全缓解率和更快功能下降的趋势相关.
- MM2和ChDir基因签名被丰富为表皮-介质细胞过渡和炎症途径,并与表皮表皮细胞 (PEC) 认同基因明显重叠,但不是 podocyte 基因.
结论:
- APOL1风险等位基因与质体中独特的基因表达模式有关,其特征是炎症和上皮-介质细胞过渡标志.
- 这些发现表明,表达 APOL1 变异的 podocytes 可能会释放激活 PEC 的炎症信号,从而导致 APOL1 病变的发生.
- 已识别的基因特征和通路为在携带APOL1风险等位基因的非洲血统个体中驱动对病的差异性易感性机制提供了新的见解.
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