• Jean Claude Semuto Ngabonziza
  • Chloé Loiseau
  • Michael Marceau
  • Agathe Jouet
  • Fabrizio Menardo
  • Rudy Antoine
  • Esdras Belamo Niyigena
  • Cyril Gaudin
  • Stéphanie Duthoy
  • Emmanuel André
  • Michel K Kaswa
  • Yves Mucyo Habimana
  • Daniela Brites
  • Dissou Affolabi
  • Jean Baptiste Mazarati
  • Sebastien Gagneux
  • Philip Supply

The human- and animal-adapted lineages of the Mycobacterium tuberculosis complex (MTBC) are thought to have expanded from a common progenitor in Africa. However, the molecular events that accompanied this emergence remain largely unknown. Here, we describe two MTBC strains isolated from patients with multidrug resistant tuberculosis, representing an as-yet-unknown lineage, named Lineage 8 (L8), seemingly restricted to the African Great Lakes region. Using genome-based phylogenetic reconstruction, we show that L8 is a sister clade to the known MTBC lineages. Comparison with other complete mycobacterial genomes indicate that the divergence of L8 preceded the loss of the cobF genome region - involved in the cobalamin/vitamin B12 synthesis - and gene interruptions in a subsequent common ancestor shared by all other known MTBC lineages. This discovery further supports an East African origin for the MTBC and provides additional molecular clues on the ancestral genome reduction associated with adaptation to a pathogenic lifestyle.

Original languageEnglish
JournalNature Communications
Issue number1
Pages (from-to)2917
Publication statusPublished - 2020

Bibliographical note


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