Role of Chromosome Changes in 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...
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BioMed Central
2015-12-01
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| Series: | Genomics & Informatics |
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| Online Access: | http://genominfo.org/upload/pdf/gni-13-102.pdf |
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| author | Kornsorn Srikulnath Watcharaporn Thapana Narongrit Muangmai |
| author_facet | Kornsorn Srikulnath Watcharaporn Thapana Narongrit Muangmai |
| author_sort | Kornsorn Srikulnath |
| collection | DOAJ |
| 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 | Article |
| id | doaj-art-6015a3663cc84ce18110a5ca04a670f6 |
| institution | Kabale University |
| issn | 1598-866X 2234-0742 |
| language | English |
| publishDate | 2015-12-01 |
| publisher | BioMed Central |
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| series | Genomics & Informatics |
| spelling | doaj-art-6015a3663cc84ce18110a5ca04a670f62025-02-03T02:23:22ZengBioMed CentralGenomics & Informatics1598-866X2234-07422015-12-0113410211110.5808/GI.2015.13.4.102142Role of Chromosome Changes in Evolution and DiversityKornsorn Srikulnath0Watcharaporn Thapana1Narongrit Muangmai2Laboratory of Animal Cytogenetics and Comparative Genomics, Department of Genetics, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand.Laboratory of Animal Cytogenetics and Comparative Genomics, Department of Genetics, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand.Department of Fishery Biology, Faculty of Fisheries, Kasetsart University, Bangkok 10900, Thailand.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.http://genominfo.org/upload/pdf/gni-13-102.pdfcentric fusion/fissioncrocodileevolutionfundamental numberkaryotype |
| spellingShingle | Kornsorn Srikulnath Watcharaporn Thapana Narongrit Muangmai Role of Chromosome Changes in Evolution and Diversity Genomics & Informatics centric fusion/fission crocodile evolution fundamental number karyotype |
| title | Role of Chromosome Changes in Evolution and Diversity |
| title_full | Role of Chromosome Changes in Evolution and Diversity |
| title_fullStr | Role of Chromosome Changes in Evolution and Diversity |
| title_full_unstemmed | Role of Chromosome Changes in Evolution and Diversity |
| title_short | Role of Chromosome Changes in Evolution and Diversity |
| title_sort | role of chromosome changes in evolution and diversity |
| topic | centric fusion/fission crocodile evolution fundamental number karyotype |
| url | http://genominfo.org/upload/pdf/gni-13-102.pdf |
| work_keys_str_mv | AT kornsornsrikulnath roleofchromosomechangesinevolutionanddiversity AT watcharapornthapana roleofchromosomechangesinevolutionanddiversity AT narongritmuangmai roleofchromosomechangesinevolutionanddiversity |