Distinctive roles of translesion polymerases DinB1 and DnaE2 in diversification of the mycobacterial genome through substitution and frameshift mutagenesis

Pierre Dupuy, Shreya Ghosh, Oyindamola Adefisayo, John Buglino, Stewart Shuman and Michael S. Glickman ()
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Pierre Dupuy: Sloan Kettering Institute
Shreya Ghosh: Sloan-Kettering Institute
Oyindamola Adefisayo: Sloan Kettering Institute
John Buglino: Sloan Kettering Institute
Stewart Shuman: Sloan-Kettering Institute
Michael S. Glickman: Sloan Kettering Institute

Nature Communications, 2022, vol. 13, issue 1, 1-13

Abstract: Abstract Antibiotic resistance of Mycobacterium tuberculosis is exclusively a consequence of chromosomal mutations. Translesion synthesis (TLS) is a widely conserved mechanism of DNA damage tolerance and mutagenesis, executed by translesion polymerases such as DinBs. In mycobacteria, DnaE2 is the only known agent of TLS and the role of DinB polymerases is unknown. Here we demonstrate that, when overexpressed, DinB1 promotes missense mutations conferring resistance to rifampicin, with a mutational signature distinct from that of DnaE2, and abets insertion and deletion frameshift mutagenesis in homo-oligonucleotide runs. DinB1 is the primary mediator of spontaneous −1 frameshift mutations in homo-oligonucleotide runs whereas DnaE2 and DinBs are redundant in DNA damage-induced −1 frameshift mutagenesis. These results highlight DinB1 and DnaE2 as drivers of mycobacterial genome diversification with relevance to antimicrobial resistance and host adaptation.

Date: 2022
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DOI: 10.1038/s41467-022-32022-8

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