Evidence for mito-nuclear and sex-linked reproductive barriers between the hybrid Italian sparrow and its parent species.
Studies of reproductive isolation between homoploid hybrid species and their parent species have rarely been carried out. Here we investigate reproductive barriers between a recently recognized hybrid bird species, the Italian sparrow Passer italiae and its parent species, the house sparrow P. domes...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2014-01-01
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| Series: | PLoS Genetics |
| Online Access: | http://europepmc.org/articles/PMC3886922?pdf=render |
| _version_ | 1818109618028544000 |
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| author | Cassandra N Trier Jo S Hermansen Glenn-Peter Sætre Richard I Bailey |
| author_facet | Cassandra N Trier Jo S Hermansen Glenn-Peter Sætre Richard I Bailey |
| author_sort | Cassandra N Trier |
| collection | DOAJ |
| description | Studies of reproductive isolation between homoploid hybrid species and their parent species have rarely been carried out. Here we investigate reproductive barriers between a recently recognized hybrid bird species, the Italian sparrow Passer italiae and its parent species, the house sparrow P. domesticus and Spanish sparrow P. hispaniolensis. Reproductive barriers can be difficult to study in hybrid species due to lack of geographical contact between taxa. However, the Italian sparrow lives parapatrically with the house sparrow and both sympatrically and parapatrically with the Spanish sparrow. Through whole-transcriptome sequencing of six individuals of each of the two parent species we identified a set of putatively parent species-diagnostic single nucleotide polymorphism (SNP) markers. After filtering for coverage, genotyping success (>97%) and multiple SNPs per gene, we retained 86 species-informative, genic, nuclear and mitochondrial SNP markers from 84 genes for analysis of 612 male individuals. We show that a disproportionately large number of sex-linked genes, as well as the mitochondria and nuclear genes with mitochondrial function, exhibit sharp clines at the boundaries between the hybrid and the parent species, suggesting a role for mito-nuclear and sex-linked incompatibilities in forming reproductive barriers. We suggest that genomic conflict via interactions between mitochondria and sex-linked genes with mitochondrial function ("mother's curse") at one boundary and centromeric drive at the other may best explain our findings. Hybrid speciation in the Italian sparrow may therefore be influenced by mechanisms similar to those involved in non-hybrid speciation, but with the formation of two geographically separated species boundaries instead of one. Spanish sparrow alleles at some loci have spread north to form reproductive barriers with house sparrows, while house sparrow alleles at different loci, including some on the same chromosome, have spread in the opposite direction to form barriers against Spanish sparrows. |
| first_indexed | 2024-12-11T02:34:07Z |
| format | Article |
| id | doaj.art-11a9a26999b9468b86bc131b64bd6b94 |
| institution | Directory Open Access Journal |
| issn | 1553-7390 1553-7404 |
| language | English |
| last_indexed | 2024-12-11T02:34:07Z |
| publishDate | 2014-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS Genetics |
| spelling | doaj.art-11a9a26999b9468b86bc131b64bd6b942022-12-22T01:23:46ZengPublic Library of Science (PLoS)PLoS Genetics1553-73901553-74042014-01-01101e100407510.1371/journal.pgen.1004075Evidence for mito-nuclear and sex-linked reproductive barriers between the hybrid Italian sparrow and its parent species.Cassandra N TrierJo S HermansenGlenn-Peter SætreRichard I BaileyStudies of reproductive isolation between homoploid hybrid species and their parent species have rarely been carried out. Here we investigate reproductive barriers between a recently recognized hybrid bird species, the Italian sparrow Passer italiae and its parent species, the house sparrow P. domesticus and Spanish sparrow P. hispaniolensis. Reproductive barriers can be difficult to study in hybrid species due to lack of geographical contact between taxa. However, the Italian sparrow lives parapatrically with the house sparrow and both sympatrically and parapatrically with the Spanish sparrow. Through whole-transcriptome sequencing of six individuals of each of the two parent species we identified a set of putatively parent species-diagnostic single nucleotide polymorphism (SNP) markers. After filtering for coverage, genotyping success (>97%) and multiple SNPs per gene, we retained 86 species-informative, genic, nuclear and mitochondrial SNP markers from 84 genes for analysis of 612 male individuals. We show that a disproportionately large number of sex-linked genes, as well as the mitochondria and nuclear genes with mitochondrial function, exhibit sharp clines at the boundaries between the hybrid and the parent species, suggesting a role for mito-nuclear and sex-linked incompatibilities in forming reproductive barriers. We suggest that genomic conflict via interactions between mitochondria and sex-linked genes with mitochondrial function ("mother's curse") at one boundary and centromeric drive at the other may best explain our findings. Hybrid speciation in the Italian sparrow may therefore be influenced by mechanisms similar to those involved in non-hybrid speciation, but with the formation of two geographically separated species boundaries instead of one. Spanish sparrow alleles at some loci have spread north to form reproductive barriers with house sparrows, while house sparrow alleles at different loci, including some on the same chromosome, have spread in the opposite direction to form barriers against Spanish sparrows.http://europepmc.org/articles/PMC3886922?pdf=render |
| spellingShingle | Cassandra N Trier Jo S Hermansen Glenn-Peter Sætre Richard I Bailey Evidence for mito-nuclear and sex-linked reproductive barriers between the hybrid Italian sparrow and its parent species. PLoS Genetics |
| title | Evidence for mito-nuclear and sex-linked reproductive barriers between the hybrid Italian sparrow and its parent species. |
| title_full | Evidence for mito-nuclear and sex-linked reproductive barriers between the hybrid Italian sparrow and its parent species. |
| title_fullStr | Evidence for mito-nuclear and sex-linked reproductive barriers between the hybrid Italian sparrow and its parent species. |
| title_full_unstemmed | Evidence for mito-nuclear and sex-linked reproductive barriers between the hybrid Italian sparrow and its parent species. |
| title_short | Evidence for mito-nuclear and sex-linked reproductive barriers between the hybrid Italian sparrow and its parent species. |
| title_sort | evidence for mito nuclear and sex linked reproductive barriers between the hybrid italian sparrow and its parent species |
| url | http://europepmc.org/articles/PMC3886922?pdf=render |
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