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The shared genetic structure and causal analysis between frailty and suicide
Siyu Deng1, Li Qian2, Lin Fang3
1Department of Clinical Psychology, Wuxi NO.8 people's Hospital, Wuxi, Jiangsu Province,China.
Behavioural Brain Research
|June 20, 2025
Summary
Frailty and suicide share a genetic link, suggesting a potential causal relationship. This connection may be influenced by the cerebellum, offering insights for early screening and therapeutic targets.
Area of Science:
- Genetics
- Gerontology
- Psychiatry
Background:
- Frailty is linked to reduced reserves, dependency, and depression.
- Frailty may increase suicide attempt risk in the elderly.
- The link between frailty and suicide risk, and its mechanisms, are not well understood.
Purpose of the Study:
- To investigate the genetic correlation between frailty and suicide.
- To explore potential causal relationships and genetic enrichment.
- To identify underlying biological mechanisms.
Main Methods:
- Genome-wide association study (GWAS) summary data was used.
- Linkage disequilibrium score regression (LDSC) assessed genetic correlation.
- Two-sample Mendelian randomization and MAGMA analyzed causality and tissue enrichment.
Main Results:
- A significant positive genetic correlation was found between frailty and suicide (rg = 0.35).
- Mendelian randomization indicated a causal relationship between genetic susceptibility to frailty and suicide.
- Genetic correlation was enriched in cerebellar regions.
Conclusions:
- A genetic correlation and causal relationship exist between frailty and suicide.
- The cerebellum may play a mediating role in this relationship.
- Findings may inform therapeutic targets and early screening for at-risk individuals.
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