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We determined the whole-genome sequence (WGS) of Streptococcus canis strain TA4 harboring the M-like protein gene (scm); the strain was isolated from a human patient presenting with bacteremia. The potential of type II-A clustered regularly interspaced short palindromic repeats (CRISPR) array-based typing was evaluated, and the genetic relation was elucidated between spacer genogroups and scm prevalence and/or polymorphisms among the isolates from 19 diseased companion animals and the human patient. CRISPRFinder and CRISPRCasFinder detected the type II-A locus with the same repeat sequences in strain TA4 and another WGS of S. canis strain, isolated from a cow with mastitis. An optimized PCR-based amplification method was used to sequence the region covering the locus around the leader and terminal repeat sequences. Among the 20 isolates sequenced, 16 strains (including TA4) were identified with the CRISPR array. We conducted comparative analysis of the homologous spacer sequences and performed grouping based on the successive common ancestral spacer types. These 16 isolates were assigned to five genogroups (A to E) with scm being absent in genogroup A. We found a relationship between genogroups C and E and allele type 1 of the deduced M-like protein. These preliminary findings suggest the feasibility of CRISPR array-based typing and a genetic relation between the spacer genogroups and scm prevalence and/or polymorphisms in the isolates.

japanese journal of infectious diseases

Analysis of the Type II-A CRISPR-Cas System in &lt;i&gt;Streptococcus canis&lt;/i&gt; Isolated from Diseased Companion Animals and One Human Patient in Japan