THE VARIABLE GENOMIC ARCHITECTURE OF ISOLATION BETWEEN HYBRIDIZING SPECIES OF HOUSE MICE

Studies of the genetics of hybrid zones can provide insight into the genomic architecture of species boundaries. By examining patterns of introgression of multiple loci across a hybrid zone, it may be possible to identify regions of the genome that have experienced selection. Here, we present a comp...

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Bibliographic Details
Published in:Evolution 2010-02, Vol.64 (2), p.472-485
Main Authors: Teeter, Katherine C., Thibodeau, Lisa M., Gompert, Zachariah, Buerkle, C. Alex, Nachman, Michael W., Tucker, Priscilla K.
Format: Article
Language:English
Subjects:
Alleles
Animals
Clines
Ecological genetics
Evolution
Evolutionary genetics
Evolutionary genomics
Genetic Heterogeneity
Genetic loci
Genetics
Genomics
Genotype & phenotype
Genotypes
Hybridity
hybridization
Hybridization, Genetic
introgression
Mice
Mice - genetics
reproductive isolation
Rodents
speciation
Studies
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Summary:Studies of the genetics of hybrid zones can provide insight into the genomic architecture of species boundaries. By examining patterns of introgression of multiple loci across a hybrid zone, it may be possible to identify regions of the genome that have experienced selection. Here, we present a comparison of introgression in two replicate transects through the house mouse hybrid zone through central Europe, using data from 41 single nucleotide markers. Using both genomic and geographic clines, we found many differences in patterns of introgression between the two transects, as well as some similarities. We found that many loci may have experienced the effects of selection at linked sites, including selection against hybrid genotypes, as well as positive selection in the form of genotypes introgressed into a foreign genetic background. We also found many positive associations of conspecific alleles among unlinked markers, which could be caused by epistatic interactions. Different patterns of introgression in the two transects highlight the challenge of using hybrid zones to identify genes underlying isolation and raise the possibility that the genetic basis of isolation between these species may be dependent on the local population genetic make-up or the local ecological setting.
ISSN:0014-3820
1558-5646
DOI:10.1111/j.1558-5646.2009.00846.x