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• W4377289007 abstract "Mycobacterium abscessus (Mab) is a multidrug-resistant pathogen increasingly responsible for severe pulmonary infections. Analysis of whole-genome sequences (WGS) of Mab demonstrates dense genetic clustering of clinical isolates collected from disparate geographic locations. This has been interpreted as supporting patient-to-patient transmission, but epidemiological studies have contradicted this interpretation. Here, we present evidence for a slowing of the Mab molecular clock rate coincident with the emergence of phylogenetic clusters. We performed phylogenetic inference using publicly available WGS from 483 Mab patient isolates. We implement a subsampling approach in combination with coalescent analysis to estimate the molecular clock rate along the long internal branches of the tree, indicating a faster long-term molecular clock rate compared to branches within phylogenetic clusters. We used ancestry simulation to predict the effects of clock rate variation on phylogenetic clustering and found that the degree of clustering in the observed phylogeny is more easily explained by a clock rate slowdown than by transmission. We also find that phylogenetic clusters are enriched in mutations affecting DNA repair machinery and report that clustered isolates have lower spontaneous mutation rates in vitro. We propose that Mab adaptation to the host environment through variation in DNA repair genes affects the organism's mutation rate and that this manifests as phylogenetic clustering. These results challenge the model that phylogenetic clustering in Mab is explained by person-to-person transmission and inform our understanding of transmission inference in emerging, facultative pathogens." @default.
• W4377289007 created "2023-05-23" @default.
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• W4377289007 date "2023-05-22" @default.
• W4377289007 modified "2023-09-23" @default.
• W4377289007 title "Mutation rates and adaptive variation among the clinically dominant clusters of <i>Mycobacterium abscessus</i>" @default.
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• W4377289007 doi "https://doi.org/10.1073/pnas.2302033120" @default.
• W4377289007 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37216535" @default.
• W4377289007 hasPublicationYear "2023" @default.
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