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Analysis of the Meiotic Segregation in Intergeneric Hybrids of Tilapias
Tilapia species exhibit a large ecological diversity and an important propensity to interspecific hybridisation. This has been shown in the wild and used in aquaculture. However, despite its important evolutionary implications, few studies have focused on the analysis of hybrid genomes and their mei...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Hindawi Publishing Corporation
2012
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3385623/ https://www.ncbi.nlm.nih.gov/pubmed/22779030 http://dx.doi.org/10.1155/2012/817562 |
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author | Bezault, Etienne Rognon, Xavier Clota, Frederic Gharbi, Karim Baroiller, Jean-Francois Chevassus, Bernard |
author_facet | Bezault, Etienne Rognon, Xavier Clota, Frederic Gharbi, Karim Baroiller, Jean-Francois Chevassus, Bernard |
author_sort | Bezault, Etienne |
collection | PubMed |
description | Tilapia species exhibit a large ecological diversity and an important propensity to interspecific hybridisation. This has been shown in the wild and used in aquaculture. However, despite its important evolutionary implications, few studies have focused on the analysis of hybrid genomes and their meiotic segregation. Intergeneric hybrids between Oreochromis niloticus and Sarotherodon melanotheron, two species highly differentiated genetically, ecologically, and behaviourally, were produced experimentally. The meiotic segregation of these hybrids was analysed in reciprocal second generation hybrid (F2) and backcross families and compared to the meiosis of both parental species, using a panel of 30 microsatellite markers. Hybrid meioses showed segregation in accordance to Mendelian expectations, independent from sex and the direction of crosses. In addition, we observed a conservation of linkage associations between markers, which suggests a relatively similar genome structure between the two parental species and the apparent lack of postzygotic incompatibility, despite their important divergence. These results provide genomics insights into the relative ease of hybridisation within cichlid species when prezygotic barriers are disrupted. Overall our results support the hypothesis that hybridisation may have played an important role in the evolution and diversification of cichlids. |
format | Online Article Text |
id | pubmed-3385623 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2012 |
publisher | Hindawi Publishing Corporation |
record_format | MEDLINE/PubMed |
spelling | pubmed-33856232012-07-09 Analysis of the Meiotic Segregation in Intergeneric Hybrids of Tilapias Bezault, Etienne Rognon, Xavier Clota, Frederic Gharbi, Karim Baroiller, Jean-Francois Chevassus, Bernard Int J Evol Biol Research Article Tilapia species exhibit a large ecological diversity and an important propensity to interspecific hybridisation. This has been shown in the wild and used in aquaculture. However, despite its important evolutionary implications, few studies have focused on the analysis of hybrid genomes and their meiotic segregation. Intergeneric hybrids between Oreochromis niloticus and Sarotherodon melanotheron, two species highly differentiated genetically, ecologically, and behaviourally, were produced experimentally. The meiotic segregation of these hybrids was analysed in reciprocal second generation hybrid (F2) and backcross families and compared to the meiosis of both parental species, using a panel of 30 microsatellite markers. Hybrid meioses showed segregation in accordance to Mendelian expectations, independent from sex and the direction of crosses. In addition, we observed a conservation of linkage associations between markers, which suggests a relatively similar genome structure between the two parental species and the apparent lack of postzygotic incompatibility, despite their important divergence. These results provide genomics insights into the relative ease of hybridisation within cichlid species when prezygotic barriers are disrupted. Overall our results support the hypothesis that hybridisation may have played an important role in the evolution and diversification of cichlids. Hindawi Publishing Corporation 2012 2012-06-18 /pmc/articles/PMC3385623/ /pubmed/22779030 http://dx.doi.org/10.1155/2012/817562 Text en Copyright © 2012 Etienne Bezault et al. https://creativecommons.org/licenses/by/3.0/ This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Article Bezault, Etienne Rognon, Xavier Clota, Frederic Gharbi, Karim Baroiller, Jean-Francois Chevassus, Bernard Analysis of the Meiotic Segregation in Intergeneric Hybrids of Tilapias |
title | Analysis of the Meiotic Segregation in Intergeneric Hybrids of Tilapias |
title_full | Analysis of the Meiotic Segregation in Intergeneric Hybrids of Tilapias |
title_fullStr | Analysis of the Meiotic Segregation in Intergeneric Hybrids of Tilapias |
title_full_unstemmed | Analysis of the Meiotic Segregation in Intergeneric Hybrids of Tilapias |
title_short | Analysis of the Meiotic Segregation in Intergeneric Hybrids of Tilapias |
title_sort | analysis of the meiotic segregation in intergeneric hybrids of tilapias |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3385623/ https://www.ncbi.nlm.nih.gov/pubmed/22779030 http://dx.doi.org/10.1155/2012/817562 |
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