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• W2801475204 abstract "ABSTRACT Mycobacterium marinum is a nontuberculous pathogen of poikilothermic fish and an opportunistic human pathogen. Like tuberculous mycobacteria, the M. marinum M strain requires the ESX-1 (ESAT-6 system 1) secretion system for virulence in host cells. EsxB and EsxA, two major virulence factors exported by the ESX-1 system, are encoded by the esxBA genes within the ESX-1 locus. Deletion of the esxBA genes abrogates ESX-1 export and attenuates M. marinum in ex vivo and in vivo models of infection. Interestingly, there are several duplications of the esxB and esxA genes ( esxB_1 , esxB_2 , esxA_1 , esxA_2 , and esxA_3 ) in the M. marinum M genome located outside the ESX-1 locus. We sought to understand if this region, known as ESX-6, contributes to ESX-1-mediated virulence. We found that deletion of the esxB _ 1 gene alone or the entire ESX-6 locus did not impact ESX-1 export or function, supporting the idea that the esxBA genes present at the ESX-1 locus are the primary contributors to ESX-1-mediated virulence. Nevertheless, overexpression of the esxB_1 locus complemented ESX-1 function in the Δ esxBA strain, signifying that the two loci are functionally equivalent. Our findings raise questions about why duplicate versions of the esxBA genes are maintained in the M. marinum M genome and how these proteins, which are functionally equivalent to virulence factors, contribute to mycobacterial biology. IMPORTANCE Mycobacterium tuberculosis is the causative agent of the human disease tuberculosis (TB). There are 10.4 million cases and 1.7 million TB-associated deaths annually, making TB a leading cause of death globally. Nontuberculous mycobacteria (NTM) cause chronic human infections that are acquired from the environment. Despite differences in disease etiology, both tuberculous and NTM pathogens use the ESX-1 secretion system to cause disease. The nontubercular mycobacterial species, Mycobacterium marinum , has additional copies of specific ESX-1 genes. Our findings demonstrate that the duplicated genes do not contribute to virulence but can substitute for virulence factors in M. marinum . These findings suggest that the duplicated genes may play a specific role in NTM biology." @default.
• W2801475204 created "2018-05-17" @default.
• W2801475204 creator A5035216355 @default.
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• W2801475204 date "2018-06-01" @default.
• W2801475204 modified "2023-10-16" @default.
• W2801475204 title "Esx Paralogs Are Functionally Equivalent to ESX-1 Proteins but Are Dispensable for Virulence in Mycobacterium marinum" @default.
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• W2801475204 doi "https://doi.org/10.1128/jb.00726-17" @default.
• W2801475204 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5952400" @default.
• W2801475204 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29555701" @default.
• W2801475204 hasPublicationYear "2018" @default.
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