EFFECTIVE POPULATION SIZE AND THE FASTER-X EFFECT: EMPIRICAL RESULTS AND THEIR INTERPRETATION

Judith E. Mank, Beatriz Vicoso, Sofia Berlin, Brian Charlesworth

Research output: Contribution to journalArticlepeer-review

Abstract

The X or Z chromosome has several characteristics that distinguish it from the autosomes, namely hemizygosity in the heterogametic sex, and a potentially different effective population size, both of which may influence the rate and nature of evolution. In particular, there may be an accelerated rate of adaptive change for X-linked compared to autosomal coding sequences, often referred to as the Faster-X effect. Empirical studies have indicated that the strength of Faster-X evolution varies among different species, and theoretical treatments have shown that demography and mating system can substantially affect the degree of Faster-X evolution. Here we integrate genomic data on Faster-X evolution from a variety of animals with the demographic factors, mating system, and sex chromosome regulatory characteristics that may influence it. Our results suggest that differences in effective population size and mechanisms of dosage compensation may influence the perceived extent of Faster-X evolution, and help to explain several clade-specific patterns that we observe.

Original languageEnglish
Pages (from-to)663-674
Number of pages12
JournalEvolution
Volume64
Issue number3
Early online date30 Sep 2009
DOIs
Publication statusPublished - 31 Mar 2010

Keywords

  • Faster-X
  • rates of evolution
  • sex chromosomes

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