Insights into the ancestry evolution of the Mycobacterium tuberculosis complex from analysis of Mycobacterium riyadhense

Qingtian Guan, Musa Garbati, Sara Mfarrej, Talal AlMutairi, Thomas Laval, Albel Singh, Shamsudeen Fagbo, Alicia Smyth, John A Browne, Muhammad Amin urRahman, Alya Alruwaili, Anwar Hoosen, Conor J Meehan, Chie Nakajima, Yasuhiko Suzuki, Caroline Demangel, Apoorva Bhatt, Stephen V Gordon, Faisal AlAsmari, Arnab Pain

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Abstract Current evolutionary scenarios posit the emergence of Mycobacterium tuberculosis from an environmental saprophyte through a cumulative process of genome adaptation. Mycobacterium riyadhense, a related bacillus, is being increasingly isolated from human clinical cases with tuberculosis-like symptoms in various parts of the world. To elucidate the evolutionary relationship between M. riyadhense and other mycobacterial species, including members of the M. tuberculosis complex (MTBC), eight clinical isolates of M. riyadhense were sequenced and analyzed. We show, among other features, that M. riyadhense shares a large number of conserved orthologs with M. tuberculosis and shows the expansion of toxin/antitoxin pairs, PE/PPE family proteins compared with other non-tuberculous mycobacteria. We observed M. riyadhense lacks wecE gene which may result in the absence of lipooligosaccharides (LOS) IV. Comparative transcriptomic analysis of infected macrophages reveals genes encoding inducers of Type I IFN responses, such as cytosolic DNA sensors, were relatively less expressed by macrophages infected with M. riyadhense or M. kansasii, compared to BCG or M. tuberculosis. Overall, our work sheds new light on the evolution of M. riyadhense, its relationship to the MTBC, and its potential as a system for the study of mycobacterial virulence and pathogenesis.
Original languageEnglish (US)
JournalNAR Genomics and Bioinformatics
Issue number3
StatePublished - Aug 11 2021

Bibliographical note

KAUST Repository Item: Exported on 2021-08-13
Acknowledged KAUST grant number(s): BAS/1/1020-01- 01
Acknowledgements: KAUST [BAS/1/1020-01- 01]; BBSRC [BB/N004574/1 to S.G., A.B.]; SFI [SFI/15/IA/3154 to S.G.].


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