DIFFERENTIAL INTROGRESSION IN A MOSAIC HYBRID ZONE REVEALS CANDIDATE BARRIER GENES

Hybrid zones act as genomic sieves. Although globally advantageous alleles will spread throughout the zone and neutral alleles can be freely exchanged between species, introgression will be restricted for genes that contribute to reproductive barriers or local adaptation. Seminal fluid proteins (SFP...

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Bibliographic Details
Published in:Evolution 2013-12, Vol.67 (12), p.3653-3661
Main Authors: Larson, Erica L., Andrés, Jose A., Bogdanowicz, Steven M., Harrison, Richard G.
Format: Article
Language:English
Subjects:
Alleles
Animals
Barriers to gene exchange
BRIEF COMMUNICATION
Clines
Evolution
Gene expression
Gene Frequency
Genes
Genes, Insect
Genetic Speciation
genomic clines
Genomics
Genotypes
Gryllidae
Gryllidae - genetics
Gryllus
Gryllus firmus
Gryllus pennsylvanicus
Hybridity
Insect genetics
Insects
Mating behavior
Mosaicism
Polymorphism
Polymorphism, Single Nucleotide
Proteins
seminal fluid proteins
Seminal Plasma Proteins - genetics
Seminal Plasma Proteins - metabolism
Speciation
Transcriptome
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Summary:Hybrid zones act as genomic sieves. Although globally advantageous alleles will spread throughout the zone and neutral alleles can be freely exchanged between species, introgression will be restricted for genes that contribute to reproductive barriers or local adaptation. Seminal fluid proteins (SFPs) are known to contribute to reproductive barriers in insects and have been proposed as candidate barrier genes in the hybridizing field crickets Gryllus pennsylvanicus and Gryllus firmus. Here, we have used 125 single nucleotide polymorphisms to characterize patterns of differential introgression and to identify genes that may contribute to prezygotic barriers between these species. Using a transcriptome scan of the male cricket accessory gland (the site of SFP synthesis), we identified genes with major allele frequency differences between the species. We then compared patterns of introgression for genes encoding SFPs with patterns for genes expressed in the same tissue that do not encode SFPs. We find no evidence that SFPs have reduced gene exchange across the cricket hybrid zone. However, a number of genes exhibit dramatically reduced introgression, and many of these genes encode proteins with functional roles consistent with known barriers.
ISSN:0014-3820
1558-5646
DOI:10.1111/evo.12205