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Genomic evidence for asymmetric introgression by sexual selection in the common wall lizard

Yang, Weizhao LU ; While, Geoffrey M. ; Laakkonen, Hanna LU ; Sacchi, Roberto ; Zuffi, Marco A.L. ; Scali, Stefano ; Salvi, Daniele and Uller, Tobias LU (2018) In Molecular Ecology
Abstract

Strongly selected characters can be transferred from one lineage to another with limited genetic exchange, resulting in asymmetric introgression and a mosaic genome in the receiving population. However, systems are rarely sufficiently well studied to link the pattern of introgression to its underlying process. Male common wall lizards in western Italy exhibit exaggeration of a suite of sexually selected characters that make them outcompete males from a distantly related lineage that lack these characters. This results in asymmetric hybridization and adaptive introgression of the suite of characters following secondary contact. We developed genomewide markers to infer the demographic history of gene flow between different genetic... (More)

Strongly selected characters can be transferred from one lineage to another with limited genetic exchange, resulting in asymmetric introgression and a mosaic genome in the receiving population. However, systems are rarely sufficiently well studied to link the pattern of introgression to its underlying process. Male common wall lizards in western Italy exhibit exaggeration of a suite of sexually selected characters that make them outcompete males from a distantly related lineage that lack these characters. This results in asymmetric hybridization and adaptive introgression of the suite of characters following secondary contact. We developed genomewide markers to infer the demographic history of gene flow between different genetic lineages, identify the spread of the sexually selected syndrome, and test the prediction that introgression should be asymmetric and heterogeneous across the genome. Our results show that secondary contact was accompanied by gene flow in both directions across most of the genome, but with approximately 3% of the genome showing highly asymmetric introgression in the predicted direction. Demographic simulations reveal that this asymmetric gene flow is more recent than the initial secondary contact, and the data suggest that the exaggerated male sexual characters originated within the Italian lineage and subsequently spread throughout this lineage before eventually reaching the contact zone. These results demonstrate that sexual selection can cause a suite of characters to spread throughout both closely and distantly related lineages with limited gene flow across the genome at large.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
asymmetric introgression, mosaic genome, Podarcis muralis, sexual selection
in
Molecular Ecology
publisher
Wiley-Blackwell
external identifiers
  • scopus:85054920963
  • pmid:30192998
ISSN
0962-1083
DOI
10.1111/mec.14861
language
English
LU publication?
yes
id
1cbdb387-bcdc-4b7f-8dda-971ab2084863
date added to LUP
2018-11-02 09:25:34
date last changed
2021-10-06 02:43:17
@article{1cbdb387-bcdc-4b7f-8dda-971ab2084863,
  abstract     = {<p>Strongly selected characters can be transferred from one lineage to another with limited genetic exchange, resulting in asymmetric introgression and a mosaic genome in the receiving population. However, systems are rarely sufficiently well studied to link the pattern of introgression to its underlying process. Male common wall lizards in western Italy exhibit exaggeration of a suite of sexually selected characters that make them outcompete males from a distantly related lineage that lack these characters. This results in asymmetric hybridization and adaptive introgression of the suite of characters following secondary contact. We developed genomewide markers to infer the demographic history of gene flow between different genetic lineages, identify the spread of the sexually selected syndrome, and test the prediction that introgression should be asymmetric and heterogeneous across the genome. Our results show that secondary contact was accompanied by gene flow in both directions across most of the genome, but with approximately 3% of the genome showing highly asymmetric introgression in the predicted direction. Demographic simulations reveal that this asymmetric gene flow is more recent than the initial secondary contact, and the data suggest that the exaggerated male sexual characters originated within the Italian lineage and subsequently spread throughout this lineage before eventually reaching the contact zone. These results demonstrate that sexual selection can cause a suite of characters to spread throughout both closely and distantly related lineages with limited gene flow across the genome at large.</p>},
  author       = {Yang, Weizhao and While, Geoffrey M. and Laakkonen, Hanna and Sacchi, Roberto and Zuffi, Marco A.L. and Scali, Stefano and Salvi, Daniele and Uller, Tobias},
  issn         = {0962-1083},
  language     = {eng},
  month        = {09},
  publisher    = {Wiley-Blackwell},
  series       = {Molecular Ecology},
  title        = {Genomic evidence for asymmetric introgression by sexual selection in the common wall lizard},
  url          = {http://dx.doi.org/10.1111/mec.14861},
  doi          = {10.1111/mec.14861},
  year         = {2018},
}