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Updated: Jun 27, 2026
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A Phenotyping Regimen for Genetically Modified Mice Used to Study Genes Implicated in Human Diseases of Aging
Published on: July 14, 2016
Shared Genetic Architectures and Causal Associations Between Diabetic Retinopathy Progression and Frailty-Related
Renxin Luo1, Xiaotong Yu2, Chen Huang2
1Department of Ophthalmology, Peking University Third Hospital, Beijing 100191, China.
Genes
|June 26, 2026
Summary
Diabetic retinopathy (DR) and physical frailty share common genetic factors, with DR liability increasing frailty and decreasing handgrip strength. These findings highlight shared genetic pathways influencing both conditions.
Area of Science:
- Genetics and Ophthalmology
- Gerontology and Public Health
Background:
- Observational studies suggest a link between diabetic retinopathy (DR) and physical frailty.
- The underlying genetic mechanisms connecting DR severity and frailty phenotypes remain largely unexplored.
Purpose of the Study:
- To investigate the shared genetic architecture between DR and frailty-related phenotypes (FRPs).
- To assess potential causal relationships between DR severity and FRPs using genetic data.
Main Methods:
- Genome-wide association study (GWAS) summary statistics for DR and FRPs were analyzed.
- Global and local genetic correlations were estimated using LDSC, HDL, and LAVA.
- Bidirectional Mendelian randomization (MR) and latent causal variable (LCV) analyses were employed to infer causality.
Main Results:
- Positive genetic correlations were observed between background DR (BDR), proliferative DR (PDR), and frailty index (FI).
- Negative genetic correlations were found between BDR/PDR and usual walking pace (UWP).
- MR analysis indicated that genetic liability to DR causally influences higher FI and lower handgrip strength (HGS), with no evidence of reverse causation.
Conclusions:
- Diabetic retinopathy and frailty share genetic determinants, implicating neurovascular, metabolic, and immune-inflammatory pathways.
- Genetic liability to DR is associated with increased frailty and functional decline.
- Candidate pleiotropic genes, including those in the MHC region (e.g., C2, AIF1), warrant further investigation.
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