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- W4376640374 abstract "Abstract Background While Mycobacterium tuberculosis complex (MTBC) variants are clonal, variant tuberculosis is a human-adapted pathogen, and variant bovis infects many hosts. Despite nucleotide identity between MTBC variants exceeding 99.95%, it remains unclear what drives these differences. Markers of adaptation into variants were sought by bacterial genome-wide association study of single nucleotide polymorphisms extracted from 6,360 MTBC members from varied hosts and countries. Results The search identified 120 genetic loci associated with MTBC variant classification and certain hosts. In many cases, these changes are uniformly fixed in certain variants while absent in others in this dataset, providing good discriminatory power in distinguishing variants by polymorphisms. Multiple changes were seen in genes for cholesterol and fatty acid metabolism, pathways previously proposed to be important for host adaptation, including Mce4F (part of the fundamental cholesterol intake Mce4 pathway), 4 FadD and FadE genes (playing roles in cholesterol and fatty acid utilization), and other targets like Rv3548c and PTPB, genes shown essential for growth on cholesterol by transposon studies. Conclusions These findings provide a robust set of genetic loci associated with the split of variant bovis and variant tuberculosis , and suggest that adaptation to new hosts could involve adjustments in uptake and catabolism of cholesterol and fatty acids, like the proposed specialization to different populations in MTB lineages by alterations to host lipid composition. Future studies are required to elucidate how the associations between cholesterol profiles and pathogen utilization differences between hosts and MTBC variants, as well as the investigation of uncharacterized genes discovered in this study. This information will likely provide an understanding on the diversification of MBO away from humans and specialization towards a broad host range." @default.
- W4376640374 created "2023-05-17" @default.
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- W4376640374 date "2023-05-16" @default.
- W4376640374 modified "2023-10-17" @default.
- W4376640374 title "Global-scale GWAS Associates a Subset of SNPs with animal-adapted variants in M. tuberculosis Complex" @default.
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- W4376640374 doi "https://doi.org/10.21203/rs.3.rs-2917146/v1" @default.
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