Epilogue: GWAS of Social Isolation
🧬 GWAS of Social Isolation
We conducted a genome-wide association study (GWAS) in approximately 60,000 Japanese individuals and identified two genetic loci significantly associated with social isolation. Moreover, we found that distinct genetic architectures underlie “lack of connection with family” and “lack of connection with friends.” Using LD score regression, we estimated that the heritability is modest, at around 4%.
đź”— Click here to read the paper
This study aimed to revisit the concept of social isolation from a genetic perspective. Given that social isolation is inherently complex and difficult to define, we approached this topic by integrating insights from social epidemiology while applying genetic analytical frameworks from our own field. This work would not have been possible without the support of many collaborators, to whom I am deeply grateful.
This was also my first experience with a press release, and it was a great pleasure to see the study covered in news and blog articles. At the same time, I was concerned that the term “genetic analysis” might create a deterministic impression of social isolation. Therefore, in our communication, we made a deliberate effort to emphasize that the heritability is limited. However, after reading various perspectives, I began to consider that a biological understanding that some individuals may be more prone to social isolation could, in certain contexts, provide a meaningful form of support.
Importantly, our findings should be interpreted strictly at the population level. They cannot be used to explain individual circumstances in terms of specific genes or direct inheritance from parents. This study lies at the intersection of human genetics and social epidemiology, and rather than directly informing public health interventions, it serves as an opportunity to reconsider the role of genetics in shaping human phenotypes.
We hope that this work encourages reflection on how genetic factors contribute, to varying degrees, to different aspects of our lives.