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A New Approach that Eliminates Handling for Studying Aggression and the "Loser" Effect in Drosophila melanogaster
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Direct and Indirect Genetic Effects on Aggression.

Camiel M van der Laan1,2, Steve G A van de Weijer2, René Pool1

  • 1Department of Biological Psychology, Vrije Universiteit, Amsterdam, the Netherlands.

Biological Psychiatry Global Open Science
|October 26, 2023
PubMed
Summary
This summary is machine-generated.

Genetic factors influence aggression, but indirect genetic effects are not significant. Polygenic scores for early-life aggression, ADHD, and education show direct, albeit small, effects on aggressive behavior.

Keywords:
AggressionGenetic nurtureIndirect genetic effectsPolygenic scoreTransmitted/nontransmitted allelesWithin-family

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Area of Science:

  • Behavioral Genetics
  • Psychiatry
  • Human Behavior

Background:

  • Aggression shows familial resemblance, with genetics explaining about 50% of variance.
  • Genotype-environment correlations may partially explain genetic influences on aggression.
  • Investigating indirect polygenic score (PGS) effects is crucial for understanding genetic contributions.

Purpose of the Study:

  • To examine the role of indirect polygenic score (PGS) effects on aggression.
  • To differentiate between direct and indirect genetic influences on aggressive behavior.

Main Methods:

  • Modeled PGS effects using genome-wide association studies for early-life aggression, educational attainment, and ADHD.
  • Utilized within- and between-family designs with extensive data from the Netherlands Twin Register.
  • Employed a transmitted/nontransmitted PGS design to assess genetic influences.

Main Results:

  • No evidence for indirect PGS effects on aggression was found in either design.
  • Significant direct effects of PGSs on aggression were observed for early-life aggression, ADHD, and educational attainment.
  • Explained variance for direct effects was low, ranging from 0.2% to 0.9%.

Conclusions:

  • Direct genetic effects, not indirect, influence aggression, aligning with prior twin and family studies.
  • Further research with diverse PGSs is needed to generalize findings on genetic influences on aggression.