FinnTwin12 Cohort: An Updated Review

Area of Science:

• Psychiatry
• Developmental Psychology
• Behavioral Genetics

Background:

• The FinnTwin12 (FT12) cohort is the youngest of the Finnish Twin Cohorts, established to study developmental trajectories.
• The study design incorporates multiwave data collection from twins and their parents, spanning from adolescence into adulthood.

Purpose of the Study:

• To investigate individual, familial, and environmental risk factors for substance use and abuse.
• To track the progression of substance use and abuse and their consequences into adulthood.
• To analyze gene-environment interactions influencing substance use and abuse.

Main Methods:

• Two-stage study design: initial wide-scale questionnaires followed by intensive assessments.
• Longitudinal data collection including in-school assessments, diagnostic interviews, laboratory studies, neuropsychological tests, and DNA collection.
• Multiwave, multirater assessments from ages 11-12 to early adulthood.

Main Results:

• The FT12 study has generated a rich dataset for analyzing gene-environment interactions.
• The design allows for tracking substance use trajectories and associated risks over time.
• The study is preparing for a fifth-wave follow-up assessment after 25 years.

Conclusions:

• The FinnTwin12 cohort provides a valuable resource for understanding the complex interplay of genetic and environmental factors in substance use disorders.
• Longitudinal data enables the examination of developmental pathways and long-term outcomes.
• Future follow-up assessments will further enhance the understanding of gene-environment interactions and substance abuse.