Journal: Emerging Infectious Diseases
Article Title: High-level Relatedness among Mycobacterium abscessus subsp. massiliense Strains from Widely Separated Outbreaks
doi: 10.3201/eid2003.131106
Figure Lengend Snippet: Neighbor-joining phylogenetic tree based on 13-target multilocus sequences types from 20 Mycobacterium abscessus subsp. massiliense genomes. Electronic PCR was performed on the M. abscessus subsp. massiliense genomes listed in by using primer pairs for 13 housekeeping genes ( cya , gdhA , argH , glpK , gnd , murC , pgm , pknA , pta , pur , rpoB , hsp65 , and secA1 ), including new primers designed as part of this study. Nucleotide sequences from each gene were concatenated for each genome and aligned by using ClustalW , and the core alignment was used for construction of a midpoint-rooted neighbor-joining phylogenetic tree by using MEGA . Strains from an outbreak of M. abscessus subsp. massiliense infections at a cystic fibrosis center in Seattle, Washington, USA, are indicated in red; strains from an outbreak of M. abscessus subsp. massiliense infections at a cystic fibrosis center in Papworth, UK, are indicated in blue (cluster 1) and purple (cluster 2); strains from Brazil are indicated in magenta; and the M. abscessus subsp. massiliense type strain is indicated in green. The longer branch length for Papworth isolate 12c was caused by low-quality nucleotides (single-nucleotide polymorphisms [SNPs]) located at the edge of Velvet contigs.
Article Snippet: To replicate data from the Papworth cystic fibrosis outbreak clusters 1 and 2 ( ) by using a similar approach, we mapped sequencing reads from the subset of 6 Papworth isolates, together with reads with from the 3 Seattle cystic fibrosis isolates and soft tissue strain CRM-0020 from Brazil , onto the M. abscessus type strain ATCC 19977 T reference genome by using BWA software ( ).
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