Genetic factors influence risk of suicide throughout life rather than at a moment in time

Suicide rates have been increasing among youth in the US. While the heritability of suicide risk is well established, there is limited understanding of how genetic risk is associated with suicidal thoughts and behaviors in young children.

A study was conducted to examine whether genetic susceptibility to suicide attempts (SAs) is associated with suicidal thoughts and behaviors in children.

This case-control study examined data from the Adolescent Brain Cognitive Development (ABCD) study, a population-based longitudinal study of 11 878 US children enrolled at age 9 and 10 years from September 2016 to November 2018. Youth reports of suicidal ideation (SI) and SAs were obtained from the Kiddie Schedule for Affective Disorder and Schizophrenia at baseline and 2 subsequent years. After conservative quality control of genotype data, this analysis focused on 4344 unrelated individuals of European ancestry. Data analysis was conducted from November 2020 to February 2022.

Results

• Of 4344 children of European ancestry significant associations were found between children's SA PRSs and their lifetime SAs with the most robust association in the follow-up year 2
• These associations remained significant after accounting for children's sociodemographic backgrounds, psychopathology symptoms, parental histories of suicide and mental health, and PRSs for major depression and attention-deficit/hyperactivity disorder
• Children's depressive mood and aggressive behavior were the most significant partial mediators of SA genetic risk on SAs
• Children's behavioral problems, such as attention problems, rule-breaking behavior, and social problems, also partially mediated the association of SA PRSs with SAs

This study's findings indicate that there may be genetic factors associated with SA risk across the life span and suggest behaviors and conditions through which the risk could be mediated in childhood. Further research is warranted to examine whether incorporating genetic data could improve the identification of children at risk for suicide.

Reference:

Lee PH, Doyle AE, Silberstein M, et al. Associations Between Genetic Risk for Adult Suicide Attempt and Suicidal Behaviors in Young Children in the US. JAMA Psychiatry. Published online August 31, 2022. doi:10.1001/jamapsychiatry.2022.2379