China Animal Husbandry and Veterinary Medicine ›› 2022, Vol. 49 ›› Issue (6): 2043-2055.doi: 10.16431/j.cnki.1671-7236.2022.06.004

• Biotechnology • Previous Articles     Next Articles

Comparison of X Chromosome Gene Coding Regions and Analysis of Codon Bias in Bos grunniens, Bos taurus and Bubalus bubalis

LIU Xinrui, WANG Jiabo, CHAI Zhixin, WU Zhijuan, YIXI Kangzhu, ZHONG Jincheng   

  1. Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Sichuan Province and Ministry of Education, Southwest Minzu University, Chengdu 610041, China
  • Received:2021-12-01 Online:2022-06-05 Published:2022-05-27

Abstract: 【Objective】 Analyzing the X chromosome of Bos grunniens and other subfamilies of cattle from the perspective of genome alignment and codon bias was helpful to understand the variety differences and phylogenetic status of Bos grunniens, and provided reference for its adaptation to high altitude low-pressure and hypoxia environment and codon optimization.【Method】 Taking the coding region sequence of Bos grunniens X chromosome reference gene as the reference panel, genome alignment and gene collinearity analysis were carried out with the coding region sequence of X chromosome reference gene of Bos taurus and Bubalus bubalis.At the same time, gene annotation was carried out.The filtered coding region files were analyzed for preference, such as relative synonymous codon usage (RSCU), ENC-plot, PR2-plot and optimal codon determination.【Result】 In the coding region of X chromosome gene of Bos grunniens, genes involved in tracheal contraction, lung respiration and body metabolism were found to be different from Bos taurus and Bubalus bubalis, such as KLHL13, CENPI and PGK1 genes.The collinearity results indicated that the long segment showed an exchange linear region due to strong natural selection and mutation pressure.In codon analysis, the codon usage bias of three species of bovine subfamily was similar, their bias was weak, and their codons were biased towards the end of G/C.Their strong biased codons (RSCU ≥ 1.5) were all CUG, GUG, AGA, AGG and UGA.Among them, 16 optimal codons were selected for Bos grunniens, 13 for Bos taurus and 9 for Bubalus bubalis.These codons all end in A/U.【Conclusion】 By comparing Bos taurus and Bubalus bubalis, Bos grunniens might be under greater natural selection, so its cumulative degree of variation in the process of evolution was also greater.The codon bias of Bos grunniens, Bos taurus and Bubalus bubalis were more affected by natural selection than mutation.These results would provide reference and guidance for Bos grunniens genetic breeding, codon optimization and the development and utilization of genetic resources.

Key words: Bos grunniens; X chromosome; comparative genomes; codon bias

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