Gene expression of behaviorally relevant genes in the cerebral hemisphere changes after selection for tameness in Red Junglefowl

PLoS One. 2017 May 8;12(5):e0177004. doi: 10.1371/journal.pone.0177004. eCollection 2017.

Abstract

The process of domestication in animals has led to alterations in behavior, physiology and phenotypic traits, changes that may be driven by correlations with reduced fear of humans. We used Red Junglefowl, ancestors of all domesticated chickens selected for either high or low fear of humans for five generations to study the effects of selection on gene transcription in the cerebral hemisphere, which is heavily involved in behaviour control. A total of 24 individuals from the parental generation as well as from the fifth selected generation were used. Twenty-two genes were significantly differentially expressed at p < 0.05 after false discovery rate (FDR) correction. Those genes that were upregulated in the low fearful animals were found to be involved in neural functions. Gene ontology and pathway analysis revealed enrichment for terms associated with behavioural processes. We conclude that five generations of divergent selection for high or low tameness has significantly changed gene expression patterns in the cerebral hemisphere in the Red Junglefowl population used here, which could underlie a range of changes in the domestic phenotype.

MeSH terms

  • Animals
  • Behavior, Animal*
  • Cerebrum / metabolism*
  • Chickens / genetics*
  • Chickens / physiology
  • Gene Expression Regulation*
  • Selection, Genetic*

Grants and funding

The project was supported by grants from the research council Formas (Grant no: 221-2010-35) (http://www.formas.se/), the Swedish Research Council VR (Grant no: 621-2011-4731) (http://www.vr.se/) and the European Research Council, ERC (Grant no: 322206 GENEWELL) (https://erc.europa.eu/). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.