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• W2003384103 abstract "The cloned mammalian cell entry gene mce1a from Mycobacterium tuberculosis confers to non-pathogenic Escherichia coli the ability to invade and survive inside macrophages and HeLa cells. The aim of this work was to search for and characterize homologs of the four M. tuberculosis mammalian cell entry operons (mce1, mce2, mce3 and mce4) in mycobacteria other than tuberculosis (MOTT). The dot-blot and polymerase chain reaction (PCR) experiments performed on 24 clinical isolates representing 20 different mycobacterial species indicated that the mce operons were widely distributed throughout the genus Mycobacterium. BLAST search results showed the presence of mce1, mce2 and mce4 homologs in Mycobacterium bovis, Mycobacterium avium and Mycobacterium smegmatis. A homologous region for the mce3 operon was also found in M. avium and M. smegmatis. DNA and protein alignments were done to compare the M. tuberculosis mce operons and the deduced M. bovis, M. avium, and M. smegmatis homologs. The deduced proteins of M. bovis mce1, mce2 and mce4 operons had 99.6-100% homology with the respective M. tuberculosis mce proteins (MTmce). The similarity between M. avium mce proteins and the individual M. tuberculosis homologs ranged from 56.2 to 85.5%. The alignment results between M. smegmatis mce proteins and the respective MTmce proteins ranged from 58.5% to 68.5%. Primer sets were designed from the M. tuberculosis mce4a gene for amplification of 379-bp fragments. Amplification was successful in 14 strains representing 11 different mycobacterial species. The PCR fragments were sequenced from 10 strains representing eight species. Alignment of the sequenced PCR products showed that mce4a homologs are highly conserved in the genus Mycobacterium. In conclusions, the four mce operons in different mycobacterial species are generally organized in the same manner. The phylogenetic tree comparing the different mce operons showed that the mce1 operon was closely related to the mce2 operon and mce3 diverged from the other operons. The wide distribution of the mce operons in pathogenic and non-pathogenic mycobacteria implicates that the presence of these putative virulence genes is not an indicator for the pathogenicity of the bacilli. Instead, the pathogenicity of these factors might be determined by their expression." @default.
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• W2003384103 date "2002-06-01" @default.
• W2003384103 modified "2023-09-27" @default.
• W2003384103 title "<i>Mycobacterium tuberculosis</i>mammalian cell entry operon (<i>mce</i>) homologs in<i>Mycobacterium</i>other than tuberculosis (MOTT)" @default.
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• W2003384103 doi "https://doi.org/10.1111/j.1574-695x.2002.tb00581.x" @default.
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