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Related Experiment Videos

Nature, nurture and depression: a twin study.

P McGuffin1, R Katz, J Rutherford

  • 1Department of Psychological Medicine, University of Wales College of Medicine, Cardiff.

Psychological Medicine
|May 1, 1991
PubMed
Summary

This twin study found that both genetic factors and shared family environment significantly contribute to major depression. Higher concordance rates in identical twins suggest a strong genetic influence on depression risk.

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Area of Science:

  • Psychiatry
  • Genetics
  • Behavioral Science

Background:

  • Major depression is a prevalent and debilitating mental health disorder.
  • Understanding the etiology of major depression, including genetic and environmental influences, is crucial for effective prevention and treatment strategies.

Purpose of the Study:

  • To investigate the contributions of genetic and environmental factors to the familiality of major depression.
  • To compare concordance rates for major depression in monozygotic and dizygotic twins.

Main Methods:

  • A twin study design was employed, systematically ascertaining 214 probands with hospital-treated major depression.
  • Probands included 84 monozygotic (identical) twin pairs and 130 dizygotic (fraternal) twin pairs.
  • Various definitions of depression were applied to co-twins, and a simple additive model was used to analyze familiality.

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Main Results:

  • Co-twin depression rates were markedly higher than in the general population across all applied definitions.
  • Monzygotic twin concordance rates for depression were significantly higher than dizygotic twin concordance rates.
  • A simple additive model indicated substantial and significant contributions from both genetic factors and shared family environment to depression familiality.

Conclusions:

  • Major depression exhibits significant familiality, influenced by both genetic predispositions and shared environmental factors.
  • The findings underscore the complex interplay of nature and nurture in the development of major depression.
  • This research provides valuable insights for understanding the heritability and environmental influences on depression.