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Int J Syst Evol Microbiol 59 (2009), 1049-1053; DOI  10.1099/ijs.0.005629-0
© 2009 International Union of Microbiological Societies

Mycobacterium riyadhense sp. nov., a non-tuberculous species identified as Mycobacterium tuberculosis complex by a commercial line-probe assay

Jakko van Ingen1,2, Sahal A. M. Al-Hajoj3, Martin Boeree2, Fahad Al-Rabiah4, Mimount Enaimi1, Rina de Zwaan1, Enrico Tortoli5, Richard Dekhuijzen2 and Dick van Soolingen1

1 National Mycobacteria Reference Laboratory, National Institute for Public Health and the Environment, Bilthoven, The Netherlands
2 Department of Pulmonary Diseases, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
3 Department of Comparative Medicine, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia
4 Department of Medicine, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia
5 Regional Reference Center for Mycobacteria, Microbiology and Virology Laboratory, Careggi Hospital, Florence, Italy

Correspondence
Jakko van Ingen
jakko.van.ingen{at}rivm.nl

A non-chromogenic, slowly growing Mycobacterium strain was isolated from a maxillary sinus lavage from a symptomatic patient in Riyadh, Saudi Arabia. It was initially identified as a member of the Mycobacterium tuberculosis complex by a commercial line-probe assay. Its 16S rRNA, hsp65 and rpoB gene and 16S–23S internal transcribed spacer sequences were unique; phylogenetic analysis based on the 16S rRNA gene sequence groups this organism close to Mycobacterium szulgai and Mycobacterium malmoense. Its unique biochemical properties and mycolic acid profile support separate species status. We propose the name Mycobacterium riyadhense sp. nov. to accommodate this strain. The type strain is NLA000201958T (=CIP 109808T =DSM 45176T).

Abbreviations: ITS, internal transcribed spacer

The GenBank/EMBL/DDBJ accession numbers for the sequences of the 16S rRNA, 16S–23S ITS, rpoB, hsp65, esat-6 and cfp-10 genes of strain NLA000201958T are EU274642, EU274643, EU274644, EU921671, EU552926 and EU552927.

Phylogenetic trees based on 16S–23S internal transcribed spacer and hsp65 sequences of selected mycobacterial species are available as supplementary material with the online version of this paper.






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