“…Genotypic taxonomy is typically based on the detection of highly conserved regions within the genome that harbor hypervariable sequences in which species-specific deletions, insertions, or replacements of single nucleotides are present in 16S rRNA, hsp65 gene and more recently on a fragment of the gene coding for the beta sub-unit of RNA polymerase (rpoB) are also contributing to this field, mostly for RGM (da Costa et al, 2009;da Costa et al, 2010). Several amplification molecular methods, have been proposed to correct NTM identification, including specific DNA probes (AccuProbe: GenProbe, Inc., San Diego, CA, U.S.A) and PRA method based on 16S rRNA (Domenech et al, 1994), 16S-23S rRNA internal transcribed spacer (ITS) (Roth et al, 1998), hsp65 (Telenti et al, 1993), rpoB (Lee et al, 2000), cold-shock protein gene (dnaJ) (Takewaki et al, 1994), DNA repair protein gene (recA) (Blackwood et al, 2000) and elongation factor Tu gene (tuf) (Shin et al, 2009), but all have limitations as the variety of mycobacteria to be identified (da Costa et al, 2010a, b).…”