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Speciation of Polyploid Cyprinidae Fish of Common Carp, Crucian Carp, and Silver Crucian Carp Derived from Duplicated Hox Genes

文献类型： 外文期刊

作者： Yuan, Jian 1 ; He, Zhuzi 1 ; Yuan, Xiangnan 1 ; Jiang, Xiayun 1 ; Sun, Xiaowen 2 ; Zou, Shuming 1 ;

作者机构： 1.Shanghai Ocean Univ, Minist Agr, Key Lab Aquat Genet Resources, Shanghai 201306, Peoples R China

2.Chinese Acad Fisheries Sci, Heilongjiang River Fisheries Res Inst, Harbin, Peoples R China

关键词： gene duplication;polyploidy;diploidy;speciation;species diversification;evolutionary model;species genome

期刊名称：JOURNAL OF EXPERIMENTAL ZOOLOGY PART B-MOLECULAR AND DEVELOPMENTAL EVOLUTION （ 影响因子：2.656； 五年影响因子：2.473 ）

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收录情况： SCI

摘要： 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 81-11.4 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. J. Exp. Zool. (Mol. Dev. Evol.) 3148:445-456, 2010

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