After three, four and five weeks of incubation the morphology changed for many of the isolates. The results are in accordance with other studies . Amongst the biofilm forming isolates, both SmT and SmO colonies were
observed, but none of these isolates had Rg mTOR inhibitor colony morphology after two weeks. SRT1720 molecular weight Table 3 Colony morphology observed after two weeks incubation on Middlebrook 7H10 agar at 37°C. Colony morphology Origin SmT1 SmO2 Intermediate Total Avian 8 (80%) 2 (20%) 10 (100%) Human 15 (42%) 18 (50%) 3 (8%) 36 (100%) Biofilm forming porcine 7 (78%) 2 (22%) 9 (100%) Biofilm non-forming porcine 19 (45%) 20 (48%) 3 (7%) 42 (100%) Total 49 (51%) 42 (43%) 6 (6%) 97 (100%) 1Smooth transparent 2Smooth opaque The reference strain ATCC 25291 was the only rough (Rg) isolate after two weeks. Ref. strains are not included in the table. GPL biosynthesis genes The isolates were divided into three groups based on PCR detection of the six genes (Table 4). Group I (14 isolates) were positive for selleck chemicals llc all genes examined (gtfA, rtfA, mtfC, mdhtA, merA and mtfF). Four biofilm
forming isolates and all five isolates from birds (four M. avium subsp. avium and one M. avium subsp. hominissuis), including the two reference strains, belonged to this group. Group II consisted of 18 isolates negative for the ser2 cluster genes
mdhtA, merA and mtfF and positive for the nsGPL genes gtfA, rtfA and mtfC. Four biofilm forming isolates belonged to this group. One isolate from swine in this group harboured ISMpa1 . Group III (nine isolates) were negative for all genes tested. All of these isolates harboured the ISMpa1- element [12, 41], and one of them (#1656) formed biofilm. Two isolates (#1591 and # 1655) had weak positive reactions to the mtfC-PCR. Sequencing showed that they had a few basepair differences compared to AF125999/TMC724 (ATCC 25291). The PCR product of #1591 was identical to the mtfC sequence of M. avium 104. In the pairs of isolates with similar or identical RFLP profiles where one formed biofilm and the other did not, five pairs had Fossariinae the same profile of genes, while three pairs did not. The presence or absence of these genes did not correlate with biofilm formation, as biofilm forming isolates were present in all three groups. Table 4 Presence of genes related to glycopeptidolipid synthesis, biofilm-formation, RFLP-clustering, presence of ISMpa1 and hsp65-code among Mycobacterium avium isolates. Isolates Origin Relation1 ISMpa1 hsp65 nsGPL genes2 ser2 genes3 Group I 989 Bird – - + + 1553,1794 Bird – 4 + + ATCC 25291 Ref str. – - + + R13 Ref str.