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Most of the antigens of Mycobacterium leprae and M. tuberculosis that have been identified are members of stress protein families, which are highly conserved throughout many diverse species. Of the M. leprae and M. tuberculosis antigens identified by monoclonal antibodies, all except the 18-kDa M. leprae antigen and the 19-kDa M. tuberculosis antigen are strongly cross-reaction between these two species and are coded within very similar genes. Studies of T cell reactivity against mycobacterial antigens have indicated that M. tuberculosis bears epitopes that are cross-reactive with the M. leprae 18-kDa antigen, but attempts to identify an 18-kDa antigen-like protein or protein coding sequence in M. tuberculosis have been unsuccessful. We have used a combination of low-stringency DNA hybridization and polymerase chain reaction techniques to identify, isolate, and sequence genes from M. avium and M. intracellulare that are very similar to the 18-kDa antigen gene of M. leprae and others that are homologs of the 19-kDa antigen gene of M. tuberculosis. Unlike M. leprae, which contains a single 18-kDa antigen gene, M. avium and M. intracellulare each have two 18-kDa antigen coding sequences. Although the M. leprae, M. avium, and M. intracellulare 18-kDa antigen genes are all very similar to one another, as are the M. tuberculosis, M. avium, and M. intracellulare 19-kDa antigen genes, we have been unable to detect any 18-kDa antigen-like coding sequences in DNA from M. tuberculosis.

Homologs of Mycobacterium leprae 18-kilodalton and Mycobacterium tuberculosis 19-kilodalton antigens in other mycobacteria