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Familial resemblance for loneliness.

Marijn A Distel1, Irene Rebollo-Mesa, Abdel Abdellaoui

  • 1Biological Psychology, VU University, Van der Boechorststraat 1, Amsterdam, The Netherlands. ma.distel@psy.vu.nl

Behavior Genetics
|February 11, 2010
PubMed
Summary

Loneliness has moderate heritability, influenced by non-additive genetic factors. Sociodemographic factors like marriage and education reduce loneliness but don't alter its genetic basis.

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Area of Science:

  • Behavioral genetics
  • Psychology
  • Human evolution

Background:

  • Social isolation and loneliness are linked to poor health and mortality.
  • Understanding the origins of individual differences in loneliness is crucial.

Purpose of the Study:

  • To investigate the genetic architecture of loneliness.
  • To examine the influence of non-additive genetic effects and sociodemographic factors.

Main Methods:

  • Utilized an extended twin-family design with 8,683 participants (twins, siblings, parents) and 917 spouses.
  • Modeled assortative mating, genetic non-additivity, vertical cultural transmission, and genotype-environment (GE) interactions.
  • Assessed GE interaction across demographic characteristics like marriage and education.

Main Results:

  • Confirmed moderate heritability of loneliness, with significant non-additive genetic variation.
  • Identified non-random mating for loneliness and no effect of vertical cultural transmission.
  • Marriage, offspring, education, and more siblings correlated with lower loneliness, particularly in men.

Conclusions:

  • Loneliness heritability is influenced by non-additive genetic factors, suggesting evolutionary relevance.
  • Sociodemographic factors impact loneliness prevalence but not its underlying genetic architecture.
  • Genetic influences on loneliness are complex, involving non-additive components.