Abstract
In this study, we investigated by genomic analysis the strains related to blue discoloration in Brazilian fresh soft cheese (Minas Frescal) and compared their genomes with those of strains from other countries associated with spoilage. Pseudomonas carnis B157 and Pseudomonas sp. A006 were studied; A006 was identified as Pseudomonas paracarnis. Orthogroup analysis was performed between predicted proteins from the genomes of 11 pigment-producing and 4 non-producing strains. We found 29 unique genes contained in a region of 74 genes, including tryptophan biosynthesis (trpABCDF) and mobile genetic element genes, such as those involved in horizontal gene transfer (HGT; e.g., pilM, pilV, pilX, tadA, traD). Thus, we show a large genomic region of discoloration-causing strains containing several HGT genes. Comprehension at the genomic level will help advance the detection of these spoilages, such as in the design of markers that will allow their tracking and control in the dairy industry.
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