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Updated: Sep 26, 2025

Substrate Generation for Endonucleases of CRISPR/Cas Systems
Published on: September 8, 2012
Characterization of CRISPR-Cas systems in Bifidobacterium breve
Xiao Han1,2, Xingya Zhou1,2, Zhangming Pei1,2
1State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, PR China.
Abstract:
The clustered regularly interspaced short palindromic repeat (CRISPR)-CRISPR-associated protein (Cas) system is an important adaptive immune system for bacteria to resist foreign DNA infection, which has been widely used in genotyping and gene editing. To provide a theoretical basis for the application of the CRISPR-Cas system in Bifidobacterium breve, the occurrence and diversity of CRISPR-Cas systems were analysed in 150 B. breve strains. Specifically, 47 % (71/150) of B. breve genomes possessed the CRISPR-Cas system, and type I-C CRISPR-Cas system was the most widely distributed among those strains. The spacer sequences present in B. breve can be used as a genotyping marker. Additionally, the phage assembly-related proteins were important targets of the type I-C CRISPR-Cas system in B. breve, and the protospacer adjacent motif sequences were further characterized in B. breve type I-C system as 5'-TTC-3'. All these results might provide a molecular basis for the development of endogenous genome editing tools in B. breve.
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