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Int J Syst Evol Microbiol. 2015 Feb;65(Pt 2):510-5. doi: 10.1099/ijs.0.064832-0. Epub 2014 Nov 11.

Mycobacterium celeriflavum sp. nov., a rapidly growing scotochromogenic bacterium isolated from clinical specimens.

Author information

1
Department of Epidemiology, Pasteur Institute of Iran, Tehran, Iran.
2
Department of Medical Microbiology, Ege University, Izmir, Turkey.
3
Emerging Bacterial Pathogens Unit, IRCCS San Raffaele Scientific Institute, Milan, Italy.
4
Department of Bacteriology and Virology, Alborz University of Medical Science, Karaj, Iran.
5
Institute for Medical Experimental Research, Istanbul University, Istanbul, Turkey.
6
Infectious and Tropical Diseases Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
7
Diagnostic Genetics Unit, Careggi University Hospital, Florence, Italy.
8
Center for Translational Genomics and Bioinformatics, IRCCS San Raffaele Scientific Institute, Milan, Italy.
9
Department of Microbiology, Tehran University of Medical Science, Tehran, Iran.
10
Microbiology Laboratory, Ospedale Maggiore Carità, Novara, Italy.
11
Emerging Bacterial Pathogens Unit, IRCCS San Raffaele Scientific Institute, Milan, Italy e.tortoli@libero.it.

Abstract

Six strains of a rapidly growing scotochromogenic mycobacterium were isolated from pulmonary specimens of independent patients. Biochemical and cultural tests were not suitable for their identification. The mycolic acid pattern analysed by HPLC was different from that of any other mycobacterium. Genotypic characterization, targeting seven housekeeping genes, revealed the presence of microheterogeneity in all of them. Different species were more closely related to the test strains in various regions: the type strain of Mycobacterium moriokaense showed 99.0 % 16S rRNA gene sequence similarity, and 91.5-96.5 % similarity for the remaining six regions. The whole genome sequences of the proposed type strain and that of M. moriokaense presented an average nucleotide identity (ANI) of 82.9 %. Phylogenetic analysis produced poorly robust trees in most genes with the exception of rpoB and sodA where Mycobacterium flavescens and Mycobacterium novocastrense were the closest species. This phylogenetic relatedness was confirmed by the tree inferred from five concatenated genes, which was very robust. The polyphasic characterization of the test strains, supported by the ANI value, demonstrates that they belong to a previously unreported species, for which the name Mycobacterium celeriflavum sp. nov. is proposed. The type strain is AFPC-000207(T) ( = DSM 46765(T) = JCM 18439(T)).

PMID:
25389151
DOI:
10.1099/ijs.0.064832-0
[Indexed for MEDLINE]

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