Abstract
A DNA-DNA hybridization experiment was carried out to clarify the relationship between Porphyromonas crevioricanis and Porphyromonas cansulci. The taxonomic standing of these two species was unclear so far because of the high 16S rRNA gene sequence similarity value (99.9 %). The DNA-DNA relatedness values between P. crevioricanis JCM 15906(T) and P. cansulci JCM 13913(T) were above 91 % (91-99 %). In addition, P. crevioricanis JCM 15906(T) exhibited high hsp60 gene sequence similarity with P. cansulci JCM 13913(T) (100 %). The hsp60 gene sequence analysis and the DNA-DNA relatedness values demonstrated that P. crevioricanis JCM 15906(T) and P. cansulci JCM 13913(T) are a single species. Based on these data, we propose Porphyromonas cansulci as a later heterotypic synonym of Porphyromonas crevioricanis.
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