Duplication and differentiation of common carp (Cyprinus carpio) myoglobin genes revealed by BAC analysis
文献类型: 外文期刊
作者: Zhao, Zi-Xia 1 ; Xu, Peng 1 ; Cao, Ding-Chen 2 ; Kuang, You-Yi 2 ; Deng, Hai-Xia 1 ; Zhang, Yan 1 ; Xu, Li-Ming 1 ; Li, J 1 ;
作者机构: 1.Chinese Acad Fishery Sci, Ctr Appl Aquat Genom, Beijing 100141, Peoples R China
2.Chinese Acad Fishery Sci, Heilongjiang River Fisheries Res Inst, Harbin 150070, Peoples R China
关键词: Common carp;Differentiation;Duplication;Hypoxia;Myoglobin
期刊名称:GENE ( 影响因子:3.688; 五年影响因子:3.329 )
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收录情况: SCI
摘要: Two distinct myoglobin (mb) transcripts have been reported in common carp, Cyprinus carpio, which is a hypoxia-tolerant fish living in habitats with greatly fluctuant dissolved oxygen levels. Recombinant protein analysis has shown functional specialization of the two mb transcripts. In this work, analysis for mb-containing bacterial artificial chromosome (BAC) clones indicated different genome loci for common carp myoglobin-1 (mb-1) and myoglobin-2 (mb-2) genes. Fluorescence in situ hybridization (FISH) revealed that mb-1 and mb-2 are located on separate chromosomes. In both of the mb-1 and mb-2 containing BAC clones, gene synteny was well conserved with the homologous region on zebrafish chromosome 1, supporting that the common carp specific mb-2 gene originated from the recent whole genome duplication event in cyprinid lineage. Transcription factor binding sites search indicated that both common carp mb genes lacked specificity Protein 1 (Sp1) and myocyte enhancer factor-2 (MEF2) binding sites, which mediated muscle-specific and calcium-dependent expression in the well-studied mb promoters. Potential hypoxia response elements (HREs) were predicted in the regulatory region of common carp mb genes. These characteristics of common carp mb gene regulatory region well interpreted the hypoxia-inducible, non-muscle expression pattern of mb-1. In the case of mb-2, a 10. bp insertion to the binding site of upstream stimulatory factor (USF), which was a co-factor of hypoxia inducible factor (HIF), might cause the non-response to hypoxia treatment of mb-2. The case of common carp mb gene duplication and subsequent differentiation in expression pattern and protein function provided an example for adaptive evolution toward aquatic hypoxia tolerance.
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