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Paul Stapleton, Rachel Pike, Peter Mullany, Victoria Lucas, Graham Roberts, Robin Rowbury, Michael Wilson, Hilary Richards, Mercuric resistance genes in gram-positive oral bacteria, FEMS Microbiology Letters, Volume 236, Issue 2, July 2004, Pages 213–220, https://doi.org/10.1111/j.1574-6968.2004.tb09649.x
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Abstract
Mercury-resistant bacteria isolated from the oral cavities of children carried one of two types of merA gene that appear to have evolved from a common ancestor. Streptococcus oralis, Streptococcus mitis and a few other species had merA genes that were very similar to merA of Bacillus cereus strain RC607. Unlike the B. cereus RC607 merA gene, however, the streptococcal merA genes were not carried on Tn5084-like transposons. Instead, comparisons with microbial genomic sequences suggest the merA gene is located on a novel type II transposon. Coagulase-negative staphylococci and Streptococcus parasanguis had identical merA genes that represent a new merA variant.