China Animal Husbandry and Veterinary Medicine ›› 2023, Vol. 50 ›› Issue (5): 1742-1753.doi: 10.16431/j.cnki.1671-7236.2023.05.002

• Biotechnology • Previous Articles     Next Articles

Bioinformatic Analysis of CRISPR-Cas System in Pasteurella multocida

LI Jiafu, MO Xiaobing   

  1. College of Veterinary Medicine, Jilin University, Changchun 130062, China
  • Received:2022-11-23 Online:2023-05-05 Published:2023-04-28

Abstract: 【Objective】 This study was aimed to understand the structural characteristics of CRISPR-Cas system and the distribution of cas gene in Pasteurella multocida,and provide a basis for the application of different CRISPR subtypes and the antiviral evolution of Pasteurella multocida.【Method】 The CRISPR cluster and cas gene were screened in the genome of Pasteurella multocida via CRISPRCasfinder online website.The conservation of repeat and spacer sequence,the secondary structure of repeat,the conservation of nucleotide sequence of cas gene,and the similarity of CRISPR cluster in various subtype system were investigated using bioinformatics analysis.【Result】 There were three subtypes(Ⅰ-F,Ⅱ-C and Ⅲ-A) of CRISPR-Cas system identified in 19 selected Pasteurella multocida strains.The repeat sequences in the same CRISPR subtypes had a relatively conservative palindrome repeat sequence,whereas the palindromic repeats varied in the different CRISPR subtypes.The tracrRNA could bind with crRNA in subtype Ⅱ-C system and form conservative structures.In CRISPR system of each subtype,the newly acquired spacer was integrated both at the 5'-end,3'-end or internal locations of CRISPR cluster.Through the analysis of the spacer sequence of each strain,it was found that the same spacer sequence existed in the CRISPR sequence within or between strains,which might relate to the sequence recombination of repeat-spacer in bacteria or convergent evolution of gene level shifts during genetic evolution.【Conclusion】 The 19 strains of Pasteurella multocida contained 3 CRISPR-Cas systems of Ⅰ-F,Ⅱ-C and Ⅲ-A.The repeat sequence of different CRISPR subtypes was significantly different.The distribution of spacer characteristic repeats might be related to the sequence recombination of repeat spacer in Pasteurella multocida during genetic evolution.

Key words: Pasteurella multocida; CRISPR-Cas system; repeat sequence; spacer sequence; bioinformatic

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