Divergence and evolution of cotton bHLH proteins from diploid to allotetraploid

Polyploidy is considered a major driving force in genome expansion, yielding duplicated genes whose expression may be conserved or divergence as a consequence of polyploidization. We compared the genome sequences of tetraploid cotton (Gossypium hirsutum) and its two diploid progenitors, G. arboreum...

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Bibliographic Details
Published in:BMC genomics 2018-02, Vol.19 (1), p.162-162, Article 162
Main Authors: Liu, Bingliang, Guan, Xueying, Liang, Wenhua, Chen, Jiedan, Fang, Lei, Hu, Yan, Guo, Wangzhen, Rong, Junkang, Xu, Guohua, Zhang, Tianzhen
Format: Article
Language:English
Subjects:
Basic Helix-Loop-Helix Transcription Factors - genetics
bHLH protein
Cotton (Plant)
Diploidy
Divergent expression
Duplicated pairs
Evolution, Molecular
Expansion
Gene Expression Regulation, Plant
Genetic aspects
Gossypium - genetics
Orthologous genes
Physiological aspects
Plant Proteins - genetics
Polyploidy
Tetraploidy
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Summary:Polyploidy is considered a major driving force in genome expansion, yielding duplicated genes whose expression may be conserved or divergence as a consequence of polyploidization. We compared the genome sequences of tetraploid cotton (Gossypium hirsutum) and its two diploid progenitors, G. arboreum and G. raimondii, and found that the bHLH genes were conserved over the polyploidization. Oppositely, the expression of the homeolgous gene pairs was diversified. The biased homeologous proportion for bHLH family is significantly higher (64.6%) than the genome wide homeologous expression bias (40%). Compared with cacao (T. cacao), orthologous genes only accounted for a small proportion (41.7%) of whole cotton bHLHs family. The further Ks analysis indicated that bHLH genes underwent at least two distinct episodes of whole genome duplication: a recent duplication (1.0-60.0 million years ago, MYA, 0.005 
ISSN:1471-2164
1471-2164
DOI:10.1186/s12864-018-4543-y