published in Scientific Reports
Barbara Tizzano, Tobias K. Dallenga, Christian Utpatel, Jochen Behrends, Susanne Homolka, ThomasA. Kohl & Stefan Niemann
In this publication, Barbara Tizzano, Tobias Dallenga, Christian Utpatel, and colleagues showed that clinical isolates of not every lineage belonging to the M. tuberculosis complex are able to resuscitate from prolonged periods of oxygen starvation. Previous text book knowledge was that reactivation from dormanxy under hypoxic conditions was a common feature of all strains of the Mycobacterium tuberculosis complex. While all clinical isolates from different sub-lineages of lineage 4 (Euro-American) re-gained ability to proliferate, those belonging to lineage 1 (East African-Indian), lineage 2 (Beijing), and lineage 3 (Delhi/ Central Asian) did not reactivate upon exposure to oxygen in terms of growth, metabolism, and transcription. Transcriptome analysis showed a distinc gene expression program for H37Rb (L4) and Beijing (L2) upon oxygen starvation. These findings could provide deeper understanding in infection dynamics and epidemiology of different lineages of the Mycobacterium tuberculosis complex and may help to develop host-directed therapies and drugs that target the dormant state of mycobacteria.