在小说阅读器中沉浸阅读 随着人口老龄化进程的加快,老年失能已成为影响生活质量和社会发展的重大公共健康问题。尽管遗传因素在失能发生中发挥着重要作用,但相关的全基因组关联研究仍十分有限。近日,我院王晓军教授团队首次开展了基于生存分析模型的全基因组关联研究(GWAS),系统探索影响老年失能发展的遗传风险。研究利用加拿大老龄化纵向研究(CLSA)老年人随访数据,发现6个全基因组显著位点和134个潜在风险位点,并在英国生物样本库(UKB)中得到部分验证。进一步的转录组关联分析、基因集与组织富集分析揭示了炎症调控、神经发生及代谢过程等关键生物学通路。团队还首次构建了失能发展的多基因风险评分(Polygenic Hazard Score, PHS), 并证实其与人口学及环境因素结合后能显著提升预测性能。同时,团队开发了可视化与个体化风险评估的在线应用平台(https://zhenghp.shinyapps.io/disability_COXGWAS/),支持GWAS结果的交互式展示及个体PHS分数的计算,为老年失能风险的预测建模和靶向预防提供了新的科学依据。本研究在老年失能遗传学领域提供了新的证据,并为建立更精准的风险预测模型与干预策略奠定了重要基础。该成果发表于老年学权威期刊Journals of Gerontology: Series A(https://doi.org/10.1093/gerona/glaf185)。
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作者介绍
郑卉萍
中国人民大学统计学院2022级博士研究生。研究方向包括老年健康遗传机制、健康预期寿命、健康不平等及人口统计模型。论文接收或发表于Demography,Journal of Gerontology Series A等期刊。
Genome-Wide Cox Regression Analysis Identifies 134 Novel Risk Loci for Disability Development: The Canadian Longitudinal Study on Aging and UK Biobank
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论文摘要
Background:Disability significantly affects the well-being of older adults and imposes substantial personal and social burdens. Although genetic effects play a role in disability, large-scale genome-wide association studies (GWAS) of disability development remain scarce.
Methods:We performed the first Cox proportional hazards GWAS on disability development on 8,421 individuals aged 65 and older from the Canadian Longitudinal Study on Aging (CLSA). Disability was defined as the inability to perform daily activities, as measured by the Activities of Daily Living (ADL) scale. A polygenic hazard score (PHS) was developed and incorporated into the predictive model, along with demographic and environmental factors.
Results:The study observed a 16.28% incidence of disability over a mean follow-up duration of 4.64 years (SD = 1.95). The COX-GWAS identified six genome-wide significant variants (p < 5E-08) and 134 independent SNPs with suggestive significance level (p < 1E−05). Replication in the UK Biobank confirmed that rs589819, rs56294014, and rs143714258 remained nominally significant and exhibited consistent effect directions. Post-GWAS analyses, including transcriptome-wide association studies TWAS, gene set, and tissue enrichment analyses, revealed genetic pathways related to inflammation regulation, neurogenesis, and metabolic processes. Incorporating PHS with demographic and environmental factors improves the prediction performance in both CLSA and UKB.
Conclusion:This study is among the first genome-wide Cox regression analyses to uncover novel genetic loci and biological pathways involved in disability development in older adults. These findings provide a foundation for predictive modeling and targeted prevention strategies.