Figure 1.

Comparison of sodA amplicons generated from sarcoidosis granulomas to M. tuberculosis sodA. PCR analysis for sodA nucleic acids in sarcoidosis granulomas revealed amplicons with 100% positional identity with M. tuberculosis complex (MTB) among 10 of 12 sarcoidosis specimens, represented by Sarcoidosis 3. Region 4 of Sarcoid 2 contained the same nucleotide substitution as Sarcoid 15 (A302G), resulting in the amino acid substitution D101G (Figure 1A). The two sarcoidosis samples were processed three months apart. Phylogenetic analysis of the amplicons placed all the sequences as most consistent with members of MTB complex, but noted that the sequences detected in Sarcoid 2 and 15 were distinct from other members, including the 10 sarcoidosis samples (Figure 1B).