| Speciation of polyploid Cyprinidae fish of common carp, crucian carp, and silver crucian carp derived from duplicated Hox genes. | |
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MedLine Citation:
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PMID: 20700889 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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Recent studies on comparative genomics have suggested that a round of fish-specific whole genome duplication (3R) in ray-finned fishes might have occurred around 226-316 Mya. Additional genome duplication, specifically in cyprinids, may have occurred more recently after the divergence of the teleosts. The timing of this event, however, is unknown. To address this question, we sequenced four Hox genes from taxa representing the polyploid Cyprinidae fish, common carp (Cyprinus carpio, 2n=100), crucian carp (Carassius auratus auratus, 2n=100), and silver crucian carp (C. auratus gibelio, 2n=156), and then compared them with known sequences from the diploid Cyprinidae fish, blunt snout bream (Megalobrama amblycephala, 2n=48). Our results showed the presence of two distinct Hox duplicates in the genomes of common and crucian carp. Three distinct Hox sequences, one of them orthologous to a Hox gene in common carp and the other two orthologous to a Hox gene in crucian carp, were isolated in silver crucian carp, indicating a possible hybrid origin of silver crucian carp from crucian and common carp. The gene duplication resulting in the origin of the common ancestor of common and crucian carp likely occurred around 10.9-13.2 Mya. The speciations of common vs. crucian carp and silver crucian vs. crucian carp likely occurred around 8.1-11.4 and 2.3-3.0 Mya, respectively. Finally, nonfunctionalization resulting from point mutations in the coding region is a probable fate for some Hox duplicates. Taken together, these results suggested an evolutionary model for polyploidization in speciation and diversification of polyploid fish. |
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Authors:
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Jian Yuan; Zhuzi He; Xiangnan Yuan; Xiayun Jiang; Xiaowen Sun; Shuming Zou |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of experimental zoology. Part B, Molecular and developmental evolution Volume: 314 ISSN: 1552-5015 ISO Abbreviation: J. Exp. Zool. B Mol. Dev. Evol. Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-08-11 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101168228 Medline TA: J Exp Zool B Mol Dev Evol Country: United States |
Other Details:
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Languages: eng Pagination: 445-56 Citation Subset: IM |
Copyright Information:
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(c) 2010 Wiley-Liss, Inc. |
Affiliation:
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Key Laboratory of Aquatic Genetic Resources Certificated by the Ministry of Agriculture, Shanghai Ocean University, Shanghai, People's Republic of China. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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