Diverse Evolutionary Histories for β-adrenoreceptor Genes in Humans

Rachele Cagliani, Matteo Fumagalli, Uberto Pozzoli, Stefania Riva, Giacomo P. Comi, Federica Torri, Fabio Macciardi, Nereo Bresolin, Manuela Sironi

Research output: Contribution to journalArticle

Abstract

In humans, three genes-ADRB1, ADRB2 and ADRB3-encode β-adrenoreceptors (ADRB); these molecules mediate the action of catecholamines in multiple tissues and play pivotal roles in cardiovascular, respiratory, metabolic, and immunological functions. Genetic variants in ADRB genes have been associated with widespread diseases and conditions, but inconsistent results have often been obtained. Here, we addressed the recent evolutionary history of ADRB genes in human populations. Although ADRB1 is neutrally evolving, most tests rejected neutral evolution for ADRB2 in European, African, and Asian population samples. Analysis of inferred haplotypes for ADRB2 revealed three major clades with a coalescence time of 1-1.5 million years, suggesting that the gene is either subjected to balancing selection or undergoing a selective sweep. Haplotype analysis also revealed ethnicity-specific differences. Additionally, we observed significant deviations from Hardy-Weinberg equilibrium (HWE) for ADRB2 genotypes in distinct European cohorts; HWE deviation depends on sex (only females are in disequilibrium), and genotypes displaying maximum and minimum relative fitness differ across population samples, suggesting a complex situation possibly involving epistasis or maternal selection. Overall, our data indicate that future association studies involving ADRB2 will benefit from taking into account ethnicity-specific haplotype distributions and sex-based effects. With respect to ADRB3, our data indicate that the gene has been subjected to a selective sweep in African populations, the Trp64 variant possibly representing the selection target. Given the previous association of the ancestral ADRB3 Arg64 allele with obesity and type 2 diabetes, dietary adaptations might represent the underlying selective force.

Original languageEnglish
Pages (from-to)64-75
Number of pages12
JournalAmerican Journal of Human Genetics
Volume85
Issue number1
DOIs
Publication statusPublished - Jul 10 2009

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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