10.5061/DRYAD.573531D
Moran, Peter A.
University College Cork
Pascoal, Sonia
University of Cambridge
Cezard, Timothée
University of Edinburgh
Risse, Judith E.
Wageningen University & Research
Ritchie, Michael G.
University of St Andrews
Bailey, Nathan W.
University of St Andrews
Data from: Opposing patterns of intraspecific and interspecific
differentiation in sex chromosomes and autosomes
Dryad
dataset
2018
faster X effect
Teleogryllus oceanicus
Teleogryllus commodus
Teleogryllus marini
Sex chromosomes
Teleogryllus
2018-05-17T21:47:16Z
2018-05-17T21:47:16Z
en
https://doi.org/10.1111/mec.14725
6228061714 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Linking intraspecific and interspecific divergence is an important
challenge in speciation research. X chromosomes are expected to evolve
faster than autosomes and disproportionately contribute to reproductive
barriers, and comparing genetic variation on X and autosomal markers
within and between species can elucidate evolutionary processes that shape
genome variation. We performed RADseq on a 16-population transect of two
closely-related Australian cricket species, Teleogryllus commodus and T.
oceanicus, covering allopatry and sympatry. This classic study system for
sexual selection provides a rare exception to Haldane’s rule, as hybrid
females are sterile. We found no evidence of recent introgression, despite
the fact that the species co-exist in overlapping habitats in the wild and
interbreed in the laboratory. Putative X-linked loci showed greater
differentiation between species compared to autosomal loci. However,
population differentiation within species was unexpectedly lower on
X-linked markers than autosomal markers, and relative X-to-autosomal
genetic diversity was inflated above neutral expectations. Populations of
both species showed genomic signatures of recent population expansions,
but these were not strong enough to account for the inflated X/A
diversity. Instead, most of the excess polymorphism on the X could better
be explained by sex-biased processes that increase the relative effective
population size of the X, such as interspecific variation in the strength
of sexual selection among males. Taken together, the opposing patterns of
diversity and differentiation at X versus autosomal loci implicate a
greater role for sex-linked genes in maintaining species boundaries in
this system.
Three_assmb_X1_A1_VCF_filesVariant call format (VCF) files from the three
de novo assemblies for the set of autosomal and X-linked variants
identified in Teleogryllus commodus and Teleogryllus
oceanicus.Three_assmb_VCF_files.replaceVariant call format (VCF) files
from the three de novo assemblies for all variants identified in
Teleogryllus commodus, Teleogryllus oceanicus and Teleogryllus
marini.Three_assmb_VCF_files.tgzscripts to filter autosomal and X-linked
SNPsPython scripts to filter autosomal and X-linked SNPs from VCF
files.X_A_filtering_scripts.tgz
Australia
Eastern Australia