However, these species are included in the species identification algorithm even though they are uncommon isolates. Using the mycobacteria identification flow chart (Figure 1) and algorithm (Table 3), M. avium-intracellulare complex (MAC) can be easily divided into M. avium spp. avium and M. intracellulare by both rpoB DPRA and hsp65 PRA. By contrast, this was not www.selleckchem.com/Androgen-Receptor.html possible with the conventional method. Using the results in Table 3, some NTM species with identical or similar hsp65 PRA can be clearly grouped by rpoB DPRA (Table 4). Ambiguous results from hsp65 PRA alone are easier
to interpret with combined rpoB DPRA and hsp65 PRA. However, M. intermedium type 1 and M. intracellulare type 3 with identical hsp65 PRA and rpoB DPRA (G group) could not be differentiated further Dehydrogenase inhibitor by this species identification algorithm and required 16 S rDNA sequencing for confirmation. Table 4 Species with identical or similar hsp65 PRA but different groups in rpoB DPRA rpoB Group Species (type) hsp65 RFLP BstEII Hae III A M. mucogenicum type 3 320 / 115 / 0 140 / 90 / 60 / 0 B M. chitae type 1 320 / 115 / 0 140 / 90 / 60 / 0 A M. mucogenicum type 2 320 / 115
/ 0 145 / 65 / 60 / 0 E M. terrae type 3 320 / 115 / 0 140 / 60 / 50 / 0 A M. fallax type 1 320 / 115 / 0 185 / 145 / 0 / 0 E M. terrae type 2 320 / 115 / 0 185 / 140 / 0 / 0 A M. peregrinum type 2 235 / 210 / 0 140 / 125 /100/50 H M. scrofulaceum type 1 235 / 210 / 0 145 / 130 / 95 / 0 BCKDHA D M. kansasii type 6 235 / 130 / 85 130 / 105 / 70 / 0 E M. gastri type 1 235 / 130 / 85 130 / 105 / 70 find more / 0 F M. celatum type 2 235 / 130 / 85 130 / 105 / 80 / 0 D M. kansasii type 1 235 / 210 / 0 130 / 105 / 80 / 0 F M. malmoense type 2 235 / 210 / 0 145 / 105 / 80 / 0 E M. simiae type 6 235 / 210 / 0 145 / 130 / 0 / 0 G M. intermedium type 1 235 / 210 / 0 145 / 130 / 0 / 0 G M. intracellulare type 3 235 / 210 / 0 145 / 130 / 0 / 0 F M. interjectum 240 / 210 / 0 130 / 110 / 0 G M. gordonae type 5 235 / 210 / 0 130 / 115 / 0 / 0 Although 16 S rDNA sequencing is the standard method for mycobacterium species identification, it cannot
differentiate some closely related rapid-growing mycobacterium species [24] or slow-growing M. kansasii and M. gastri that had identical 16 S rDNA sequences, but these can be differentiated by hsp65 PRA and rpoB DPRA. There are some reports [6, 25] of conflicting results from different methods for mycobacterial species identification, probably caused by a failure of one method to identify all test strains correctly. Combining methods for mycobacterial species identification can improve the accuracy rate, avoid ambiguous results, and save time. Many CE-based studies [5–9] in PCR-RFLP analysis have investigated improving band size discrimination. In one study by Chang et al. [7], high-resolution CE gave more precise estimates of DNA fragment sizes than analysis by the naked eye, and CE could detect low molecular weight fragments (down to 12 bp).