Parent-Offspring Resemblance for Drinking Behaviors in a Longitudinal Twin Sample

Area of Science:

• Behavioral Genetics
• Psychiatry
• Developmental Psychology

Background:

• Understanding familial influences on alcohol use is crucial for prevention and intervention strategies.
• Parent-offspring resemblance for substance use patterns can inform genetic and environmental contributions.

Purpose of the Study:

• To evaluate parent-offspring resemblance for alcohol consumption and dependence symptoms.
• To examine sex-specific effects on these familial patterns.
• To determine how these patterns change across adolescence and early adulthood.

Main Methods:

• Longitudinal assessment of three twin cohorts from ages 14 to 29 years.
• Direct assessment of parents using structured interviews.
• Inclusion of 3,762 offspring and their parents from the Minnesota Twin Family Study.
• Measurement of alcohol use via a composite index and alcohol dependence symptom counts.

Main Results:

• Parent-offspring correlations for alcohol consumption increased from adolescence (r = .12 at age 14) to early adulthood (r = .25 at age 17), stabilizing by age 29 (r = .19).
• Familial resemblance for alcohol dependence symptoms peaked at age 17 (r = .18) and declined by age 29 (r = .11).
• No significant variations in parent-offspring correlations were found based on the sex of the offspring or parent.

Conclusions:

• Parent-offspring resemblance for alcohol use and problems is generally stable after early adulthood.
• Resemblance for alcohol use is present at higher magnitudes throughout offspring development.
• No evidence of differential resemblance based on sex was observed.