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KMID : 0545120160260081473
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Journal of Microbiology and Biotechnology
2016 Volume.26 No. 8 p.1473 ~ p.1480
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Sequence Variations in the Non-Coding Sequence of CTX Phages in Vibrio cholerae
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Kim Eun-Jin
Yu Hyun-Jin
Kim Dong-Wook
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Abstract
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This study focused on the variations in the non-coding sequences between ctxB and rstR of various CTX phages. The non-coding sequences of CTX-1 and CTX-cla are phage type-specific. The length of the non-coding region of CTX-1 and CTX-cla is 601 and 730 nucleotides, respectively. The non-coding sequence of CTX phage could be divided into three regions. There is a phage type-specific Variable region between two homologous Common regions (Common regions 1 and 2). The non-coding sequence of RS1 element is similar to CTX-1 except that Common region 1 is replaced by a short RS1-specific sequence. The non-coding sequences of CTX-2 and CTX-cla are homologous, indicating the non-coding sequence of CTX-2 is derived from CTX-cla. The non-coding region of CTX-O139 is similar to CTX-cla and CTX-2; however, it contains an extra phage type-specific sequence between Common region 2 and rstR. The variations in the non-coding sequences of CTX phages might be associated with the difference in the replication efficiency and the directionality in the integration into the V. cholerae chromosome.
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KEYWORD
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Vibrio cholerae, CTX phage, non-coding sequence
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