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- W2131349969 abstract "Insertion sequence (IS) elements are bacterial genes that are able to transpose to different locations in the genome. These elements are often used in molecular epidemiology as genetic markers that track the spread of pathogens. Transposable elements have frequently been described as selfish DNA because they facilitate their own transposition, causing damage when they insert into coding regions, while contributing little if anything to the bacterial host. According to this hypothesis, the expansion of copy number of insertion sequences is opposed by negative selection against high copy numbers. From an alternative point of view, we might expect IS elements to intrinsically regulate transposition within cells, thereby limiting damage to their bacterial host. Here, we report evidence that the copy number of IS6110 in Mycobacterium tuberculosis is controlled by selection against the element. We first construct 12 different models of marker change resulting from a combination of possible transposition functions and selective regimes. We then compute the Akaike Information Criterion for each model to identify the models that best explain data consisting of serial isolates of M. tuberculosis genotyped with IS6110. We find that the best performing models all include selection against the accumulation of copies. Specifically, our analysis points to the interaction of separate copies of the element causing lethal effects. We discuss the implications of these findings for genome evolution and molecular epidemiology." @default.
- W2131349969 created "2016-06-24" @default.
- W2131349969 creator A5013539361 @default.
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- W2131349969 date "2004-08-11" @default.
- W2131349969 modified "2023-09-23" @default.
- W2131349969 title "The Control of Copy Number of IS6110 in Mycobacterium tuberculosis" @default.
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- W2131349969 doi "https://doi.org/10.1093/molbev/msh234" @default.
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