Exome sequencing identifies protein-coding variants associated with loneliness and social isolation
Yi-Xuan Wang1, Chen-Jie Fei1, Chun Shen2
1Department of Neurology and National Center for Neurological Disorders, Huashan Hospital, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Fudan University, Shanghai, China.
Journal of Affective Disorders
|January 22, 2025
Summary
This study identified 19 novel genetic risk factors for loneliness and social isolation. These findings shed light on the genetic basis of these public health issues and inform future interventions.
Area of Science:
- Genetics
- Psychiatry
- Public Health
Background:
- Loneliness and social isolation are significant public health concerns with largely unknown genetic causes.
- Understanding the genetic basis is crucial for developing effective interventions.
Purpose of the Study:
- To investigate the role of protein-coding variants in loneliness and social isolation.
- To identify novel genetic risk factors for these conditions.
Main Methods:
- Conducted the first exome-wide association analysis for loneliness and social isolation in large cohorts (over 330,000 participants).
- Performed sensitivity analyses, estimated genetic burden heritability, and explored biological insights.
- Utilized brain-wide and phenome-wide association analyses to link identified genes with brain structure and other phenotypes.
Main Results:
- Identified 13 risk genes for loneliness (6 novel) and 6 for social isolation (majority novel).
- Discovered 47 associations between identified genes and brain structure phenotypes relevant to social processing.
- Found significant links between these genes and various phenotypes, including blood biomarkers and cognitive measures.
Conclusions:
- This study reveals novel genetic underpinnings of loneliness and social isolation.
- The findings provide a foundation for future research into gene function and potential public health interventions.
- Acknowledges limitations in current measurement tools for these complex social factors.
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