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Pagani TD, Corrêa PR, Lima C, Gomes LHF, Schwarz MGA, Galvão TC, Degrave WM, Valadares NF, Mendonça-Lima L. Impact of Genomic Deletion RD16 on the Expression of the Mycobacterium bovis BCG Moreau VapBC47 Toxin-Antitoxin System. Curr Issues Mol Biol 2023; 45:6538-6549. [PMID: 37623231 PMCID: PMC10453824 DOI: 10.3390/cimb45080412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Revised: 05/23/2023] [Accepted: 05/27/2023] [Indexed: 08/26/2023] Open
Abstract
Mycobacterium bovis BCG is the only vaccine against tuberculosis. The variable forms of cultivation throughout the years, before seed-lots were developed, allowed in vitro evolution of the original strain, generating a family of vaccines with different phenotypic and genotypic characteristics. Molecular studies revealed regions of difference (RDs) in the genomes of the various BCG strains. This work aims to characterize the gene pair rv3407-rv3408 (vapB47-vapC47), coding for a toxin-antitoxin system of the VapBC family, and to evaluate possible transcriptional effects due to the adjacent BCG Moreau-specific genomic deletion RD16. We show that these genes are co-transcribed in BCG strains Moreau and Pasteur, and that the inactivation of an upstream transcriptional repressor (Rv3405c) due to RD16 has a polar effect, leading to increased vapBC47 expression. Furthermore, we detect VapB47 DNA binding in vitro, dependent on a 5' vapB47 sequence that contributes to a palindrome, spanning the promoter and coding region. Our data shed light on the regulation of VapBC systems and on the impact of the BCG Moreau RD16 deletion in the expression of adjacent genes, contributing to a better understanding of BCG Moreau physiology.
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Affiliation(s)
- Talita Duarte Pagani
- Laboratório de Genômica Funcional e Bioinformática, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro 21040-360, RJ, Brazil; (T.D.P.); (P.R.C.); (C.L.); (L.H.F.G.); (M.G.A.S.); (W.M.D.)
| | - Paloma Rezende Corrêa
- Laboratório de Genômica Funcional e Bioinformática, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro 21040-360, RJ, Brazil; (T.D.P.); (P.R.C.); (C.L.); (L.H.F.G.); (M.G.A.S.); (W.M.D.)
| | - Cristiane Lima
- Laboratório de Genômica Funcional e Bioinformática, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro 21040-360, RJ, Brazil; (T.D.P.); (P.R.C.); (C.L.); (L.H.F.G.); (M.G.A.S.); (W.M.D.)
| | - Leonardo Henrique Ferreira Gomes
- Laboratório de Genômica Funcional e Bioinformática, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro 21040-360, RJ, Brazil; (T.D.P.); (P.R.C.); (C.L.); (L.H.F.G.); (M.G.A.S.); (W.M.D.)
| | - Marcos Gustavo Araujo Schwarz
- Laboratório de Genômica Funcional e Bioinformática, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro 21040-360, RJ, Brazil; (T.D.P.); (P.R.C.); (C.L.); (L.H.F.G.); (M.G.A.S.); (W.M.D.)
| | - Teca Calcagno Galvão
- Laboratório de Bacteriologia, Centro de Referência Prof. Hélio Fraga, Escola Nacional de Saúde Pública Sergio Arouca, Fiocruz, Rio de Janeiro 21041-210, RJ, Brazil;
| | - Wim Maurits Degrave
- Laboratório de Genômica Funcional e Bioinformática, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro 21040-360, RJ, Brazil; (T.D.P.); (P.R.C.); (C.L.); (L.H.F.G.); (M.G.A.S.); (W.M.D.)
| | | | - Leila Mendonça-Lima
- Laboratório de Genômica Funcional e Bioinformática, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro 21040-360, RJ, Brazil; (T.D.P.); (P.R.C.); (C.L.); (L.H.F.G.); (M.G.A.S.); (W.M.D.)
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