Abstract：
:Phenotypic convergence is an exciting outcome of adaptive evolution, occurring when different species find similar solutions to the same problem. Unraveling the molecular basis of convergence provides a way to link genotype to adaptive phenotypes, but can also shed light on the extent to which molecular evolution is repeatable and predictable. Many recent genome-wide studies have uncovered a striking pattern of diminishing convergence over time, ascribing this pattern to the presence of intramolecular epistatic interactions. Here, we consider gene tree discordance as an alternative cause of changes in convergence levels over time in a primate dataset. We demonstrate that gene tree discordance can produce patterns of diminishing convergence by itself, and that controlling for discordance as a cause of apparent convergence makes the pattern disappear. We also show that synonymous substitutions, where neither selection nor epistasis should be prevalent, have the same diminishing pattern of molecular convergence in primates. Finally, we demonstrate that even in situations where biological discordance is not possible, discordance due to errors in species tree inference can drive similar patterns. Though intramolecular epistasis could in principle create a pattern of declining convergence over time, our results suggest a possible alternative explanation for this widespread pattern. These results contribute to a growing appreciation not just of the presence of gene tree discordance, but of the unpredictable effects this discordance can have on analyses of molecular evolution.
journal_name
Mol Biol Evoljournal_title
Molecular biology and evolutionauthors
Mendes FK,Hahn Y,Hahn MWdoi
10.1093/molbev/msw197subject
Has Abstractpub_date
2016-12-01 00:00:00pages
3299-3307issue
12eissn
0737-4038issn
1537-1719pii
msw197journal_volume
33pub_type
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pub_type： 杂志文章
doi：10.1093/oxfordjournals.molbev.a040360
更新日期：1985-09-01 00:00:00
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更新日期：2008-11-01 00:00:00
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