Study of male–mediated gene flow across a hybrid zone in the common shrew (Sorex araneus) using Y chromosome
Despite many studies, the impact of chromosome rearrangements on gene flow between chromosome races of the common shrew (Sorex araneus Linnaeus, 1758) remains unclear. Interracial hybrids form meiotic chromosome complexes that are associated with reduced fertility. Nevertheless comprehensive investi...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Pensoft Publishers
2017-06-01
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| Series: | Comparative Cytogenetics |
| Online Access: | https://compcytogen.pensoft.net/articles.php?id=13494 |
| _version_ | 1818491900285419520 |
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| author | Andrei V. Polyakov Viktor V. Panov |
| author_facet | Andrei V. Polyakov Viktor V. Panov |
| author_sort | Andrei V. Polyakov |
| collection | DOAJ |
| description | Despite many studies, the impact of chromosome rearrangements on gene flow between chromosome races of the common shrew (Sorex araneus Linnaeus, 1758) remains unclear. Interracial hybrids form meiotic chromosome complexes that are associated with reduced fertility. Nevertheless comprehensive investigations of autosomal and mitochondrial markers revealed weak or no barrier to gene flow between chromosomally divergent populations.
In a narrow zone of contact between the Novosibirsk and Tomsk races hybrids are produced with extraordinarily complex configurations at meiosis I. Microsatellite markers have not revealed any barrier to gene flow, but the phenotypic differentiation between races is greater than may be expected if gene flow was unrestricted. To explore this contradiction we analyzed the distribution of the Y chromosome SNP markers within this hybrid zone. The Y chromosome variants in combination with race specific autosome complements allow backcrosses to be distinguished and their proportion among individuals within the hybrid zone to be evaluated. The balanced ratio of the Y variants observed among the pure race individuals as well as backcrosses reveals no male mediated barrier to gene flow. The impact of reproductive unfitness of backcrosses on gene flow is discussed as a possible mechanism of the preservation of race-specific morphology within the hybrid zone. |
| first_indexed | 2024-12-10T17:36:39Z |
| format | Article |
| id | doaj.art-8489a65c93ba436ab60a9a80023e1950 |
| institution | Directory Open Access Journal |
| issn | 1993-0771 1993-078X |
| language | English |
| last_indexed | 2024-12-10T17:36:39Z |
| publishDate | 2017-06-01 |
| publisher | Pensoft Publishers |
| record_format | Article |
| series | Comparative Cytogenetics |
| spelling | doaj.art-8489a65c93ba436ab60a9a80023e19502022-12-22T01:39:31ZengPensoft PublishersComparative Cytogenetics1993-07711993-078X2017-06-0111242143010.3897/CompCytogen.v11i2.1349413494Study of male–mediated gene flow across a hybrid zone in the common shrew (Sorex araneus) using Y chromosomeAndrei V. Polyakov0Viktor V. Panov1Institute of Cytology and Genetics, the Siberian Branch of the Russian Academy of SciencesInstitute of Systematics and Ecology of Animals, the Siberian Branch of the Russian Academy of SciencesDespite many studies, the impact of chromosome rearrangements on gene flow between chromosome races of the common shrew (Sorex araneus Linnaeus, 1758) remains unclear. Interracial hybrids form meiotic chromosome complexes that are associated with reduced fertility. Nevertheless comprehensive investigations of autosomal and mitochondrial markers revealed weak or no barrier to gene flow between chromosomally divergent populations. In a narrow zone of contact between the Novosibirsk and Tomsk races hybrids are produced with extraordinarily complex configurations at meiosis I. Microsatellite markers have not revealed any barrier to gene flow, but the phenotypic differentiation between races is greater than may be expected if gene flow was unrestricted. To explore this contradiction we analyzed the distribution of the Y chromosome SNP markers within this hybrid zone. The Y chromosome variants in combination with race specific autosome complements allow backcrosses to be distinguished and their proportion among individuals within the hybrid zone to be evaluated. The balanced ratio of the Y variants observed among the pure race individuals as well as backcrosses reveals no male mediated barrier to gene flow. The impact of reproductive unfitness of backcrosses on gene flow is discussed as a possible mechanism of the preservation of race-specific morphology within the hybrid zone.https://compcytogen.pensoft.net/articles.php?id=13494 |
| spellingShingle | Andrei V. Polyakov Viktor V. Panov Study of male–mediated gene flow across a hybrid zone in the common shrew (Sorex araneus) using Y chromosome Comparative Cytogenetics |
| title | Study of male–mediated gene flow across a hybrid zone in the common shrew (Sorex araneus) using Y chromosome |
| title_full | Study of male–mediated gene flow across a hybrid zone in the common shrew (Sorex araneus) using Y chromosome |
| title_fullStr | Study of male–mediated gene flow across a hybrid zone in the common shrew (Sorex araneus) using Y chromosome |
| title_full_unstemmed | Study of male–mediated gene flow across a hybrid zone in the common shrew (Sorex araneus) using Y chromosome |
| title_short | Study of male–mediated gene flow across a hybrid zone in the common shrew (Sorex araneus) using Y chromosome |
| title_sort | study of male mediated gene flow across a hybrid zone in the common shrew sorex araneus using y chromosome |
| url | https://compcytogen.pensoft.net/articles.php?id=13494 |
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