Cargando…

Role of Chromosome Changes in Crocodylus Evolution and Diversity

The karyotypes of most species of crocodilians were studied using conventional and molecular cytogenetics. These provided an important contribution of chromosomal rearrangements for the evolutionary processes of Crocodylia and Sauropsida (birds and reptiles). The karyotypic features of crocodilians...

Descripción completa

Detalles Bibliográficos
Autores principales: Srikulnath, Kornsorn, Thapana, Watcharaporn, Muangmai, Narongrit
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Korea Genome Organization 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4742319/
https://www.ncbi.nlm.nih.gov/pubmed/26865840
http://dx.doi.org/10.5808/GI.2015.13.4.102
_version_ 1782414181996167168
author Srikulnath, Kornsorn
Thapana, Watcharaporn
Muangmai, Narongrit
author_facet Srikulnath, Kornsorn
Thapana, Watcharaporn
Muangmai, Narongrit
author_sort Srikulnath, Kornsorn
collection PubMed
description The karyotypes of most species of crocodilians were studied using conventional and molecular cytogenetics. These provided an important contribution of chromosomal rearrangements for the evolutionary processes of Crocodylia and Sauropsida (birds and reptiles). The karyotypic features of crocodilians contain small diploid chromosome numbers (30~42), with little interspecific variation of the chromosome arm number (fundamental number) among crocodiles (56~60). This suggested that centric fusion and/or fission events occurred in the lineage, leading to crocodilian evolution and diversity. The chromosome numbers of Alligator, Caiman, Melanosuchus, Paleosuchus, Gavialis, Tomistoma, Mecistops, and Osteolaemus were stable within each genus, whereas those of Crocodylus (crocodylians) varied within the taxa. This agreed with molecular phylogeny that suggested a highly recent radiation of Crocodylus species. Karyotype analysis also suggests the direction of molecular phylogenetic placement among Crocodylus species and their migration from the Indo-Pacific to Africa and The New World. Crocodylus species originated from an ancestor in the Indo-Pacific around 9~16 million years ago (MYA) in the mid-Miocene, with a rapid radiation and dispersion into Africa 8~12 MYA. This was followed by a trans-Atlantic dispersion to the New World between 4~8 MYA in the Pliocene. The chromosomes provided a better understanding of crocodilian evolution and diversity, which will be useful for further study of the genome evolution in Crocodylia.
format Online
Article
Text
id pubmed-4742319
institution National Center for Biotechnology Information
language English
publishDate 2015
publisher Korea Genome Organization
record_format MEDLINE/PubMed
spelling pubmed-47423192016-02-10 Role of Chromosome Changes in Crocodylus Evolution and Diversity Srikulnath, Kornsorn Thapana, Watcharaporn Muangmai, Narongrit Genomics Inform Review Article The karyotypes of most species of crocodilians were studied using conventional and molecular cytogenetics. These provided an important contribution of chromosomal rearrangements for the evolutionary processes of Crocodylia and Sauropsida (birds and reptiles). The karyotypic features of crocodilians contain small diploid chromosome numbers (30~42), with little interspecific variation of the chromosome arm number (fundamental number) among crocodiles (56~60). This suggested that centric fusion and/or fission events occurred in the lineage, leading to crocodilian evolution and diversity. The chromosome numbers of Alligator, Caiman, Melanosuchus, Paleosuchus, Gavialis, Tomistoma, Mecistops, and Osteolaemus were stable within each genus, whereas those of Crocodylus (crocodylians) varied within the taxa. This agreed with molecular phylogeny that suggested a highly recent radiation of Crocodylus species. Karyotype analysis also suggests the direction of molecular phylogenetic placement among Crocodylus species and their migration from the Indo-Pacific to Africa and The New World. Crocodylus species originated from an ancestor in the Indo-Pacific around 9~16 million years ago (MYA) in the mid-Miocene, with a rapid radiation and dispersion into Africa 8~12 MYA. This was followed by a trans-Atlantic dispersion to the New World between 4~8 MYA in the Pliocene. The chromosomes provided a better understanding of crocodilian evolution and diversity, which will be useful for further study of the genome evolution in Crocodylia. Korea Genome Organization 2015-12 2015-12-31 /pmc/articles/PMC4742319/ /pubmed/26865840 http://dx.doi.org/10.5808/GI.2015.13.4.102 Text en Copyright © 2015 by the Korea Genome Organization http://creativecommons.org/licenses/by-nc/4.0/ It is identical to the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/).
spellingShingle Review Article
Srikulnath, Kornsorn
Thapana, Watcharaporn
Muangmai, Narongrit
Role of Chromosome Changes in Crocodylus Evolution and Diversity
title Role of Chromosome Changes in Crocodylus Evolution and Diversity
title_full Role of Chromosome Changes in Crocodylus Evolution and Diversity
title_fullStr Role of Chromosome Changes in Crocodylus Evolution and Diversity
title_full_unstemmed Role of Chromosome Changes in Crocodylus Evolution and Diversity
title_short Role of Chromosome Changes in Crocodylus Evolution and Diversity
title_sort role of chromosome changes in crocodylus evolution and diversity
topic Review Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4742319/
https://www.ncbi.nlm.nih.gov/pubmed/26865840
http://dx.doi.org/10.5808/GI.2015.13.4.102
work_keys_str_mv AT srikulnathkornsorn roleofchromosomechangesincrocodylusevolutionanddiversity
AT thapanawatcharaporn roleofchromosomechangesincrocodylusevolutionanddiversity
AT muangmainarongrit roleofchromosomechangesincrocodylusevolutionanddiversity