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Li, Jiong-Tang; Wang, Qi; Huang Yang, Mei-Di; Li, Qing-Song; Cui, Ming-Shu; Dong, Zai-Jie; Wang, Hong-Wei; Yu, Ju-Hua; Zhao, Yu-Jie; Yang, Chen-Ru; Wang, Ya-Xin; Sun, Xiao-Qing; Zhang, Yan; Zhao, Ran; Jia, Zhi-Ying; Wang, Xi-Yin
Nature genetics, 10/2021, Volume: 53, Issue: 10Journal Article
How two subgenomes in allo-tetraploids adapt to coexistence and coordinate through structure and expression evolution requires extensive studies. In the present study, we report an improved genome assembly of allo-tetraploid common carp, an updated genome annotation of allo-tetraploid goldfish and the chromosome-scale assemblies of a progenitor-like diploid Puntius tetrazona and an outgroup diploid Paracanthobrama guichenoti. Parallel subgenome structure evolution in the allo-tetraploids was featured with equivalent chromosome components, higher protein identities, similar transposon divergence and contents, homoeologous exchanges, better synteny level, strong sequence compensation and symmetric purifying selection. Furthermore, we observed subgenome expression divergence processes in the allo-tetraploids, including inter-/intrasubgenome trans-splicing events, expression dominance, decreased expression levels, dosage compensation, stronger expression correlation, dynamic functionalization and balancing of differential expression. The potential disorders introduced by different progenitors in the allo-tetraploids were hypothesized to be alleviated by increasing structural homogeneity and performing versatile expression processes. Resequencing three common carp strains revealed two major ecotypes and uncovered candidate genes relevant to growth and survival rate.
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