Genome-wide association study identifies 48 common genetic variants associated with handedness

Nat Hum Behav. 2021 Jan;5(1):59-70. doi: 10.1038/s41562-020-00956-y. Epub 2020 Sep 28.

Abstract

Handedness has been extensively studied because of its relationship with language and the over-representation of left-handers in some neurodevelopmental disorders. Using data from the UK Biobank, 23andMe and the International Handedness Consortium, we conducted a genome-wide association meta-analysis of handedness (N = 1,766,671). We found 41 loci associated (P < 5 × 10-8) with left-handedness and 7 associated with ambidexterity. Tissue-enrichment analysis implicated the CNS in the aetiology of handedness. Pathways including regulation of microtubules and brain morphology were also highlighted. We found suggestive positive genetic correlations between left-handedness and neuropsychiatric traits, including schizophrenia and bipolar disorder. Furthermore, the genetic correlation between left-handedness and ambidexterity is low (rG = 0.26), which implies that these traits are largely influenced by different genetic mechanisms. Our findings suggest that handedness is highly polygenic and that the genetic variants that predispose to left-handedness may underlie part of the association with some psychiatric disorders.

Publication types

  • Meta-Analysis
  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Female
  • Functional Laterality / genetics*
  • Gene Frequency / genetics
  • Genetic Loci / genetics
  • Genetic Variation / genetics*
  • Genome-Wide Association Study
  • Humans
  • Linkage Disequilibrium
  • Male
  • Middle Aged
  • Polymorphism, Single Nucleotide / genetics
  • Quantitative Trait, Heritable
  • Sex Factors