Abstract:
:Mimulus guttatus and M. nasutus are an evolutionary and ecological model sister species pair differentiated by ecology, mating system, and partial reproductive isolation. Despite extensive research on this system, the history of divergence and differentiation in this sister pair is unclear. We present and analyze a population genomic data set which shows that M. nasutus budded from a central Californian M. guttatus population within the last 200 to 500 thousand years. In this time, the M. nasutus genome has accrued genomic signatures of the transition to predominant selfing, including an elevated proportion of nonsynonymous variants, an accumulation of premature stop codons, and extended levels of linkage disequilibrium. Despite clear biological differentiation, we document genomic signatures of ongoing, bidirectional introgression. We observe a negative relationship between the recombination rate and divergence between M. nasutus and sympatric M. guttatus samples, suggesting that selection acts against M. nasutus ancestry in M. guttatus.
journal_name
PLoS Genetjournal_title
PLoS geneticsauthors
Brandvain Y,Kenney AM,Flagel L,Coop G,Sweigart ALdoi
10.1371/journal.pgen.1004410subject
Has Abstractpub_date
2014-06-26 00:00:00pages
e1004410issue
6eissn
1553-7390issn
1553-7404pii
PGENETICS-D-13-03056journal_volume
10pub_type
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