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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...

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Autores principales: Bezault, Etienne, Rognon, Xavier, Clota, Frederic, Gharbi, Karim, Baroiller, Jean-Francois, Chevassus, Bernard
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Hindawi Publishing Corporation 2012
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.
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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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