Reference: Hughes AL and Friedman R (2004) Transposable element distribution in the yeast genome reflects a role in repeated genomic rearrangement events on an evolutionary time scale. Genetica 121(2):181-5

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Abstract


Statistical analysis of the distribution of transposable elements (TEs) and tRNA genes in the genome of yeast Saccharomyces cerevisiae indicated that, although tRNA genes and other genes transcribed by RNA polymerase III are targets for TE insertion, the distribution of TEs was significantly more clumped than that of tRNAs. Genomic blocks putatively duplicated as the result of an ancient polyploidization event contained fewer TEs than expected by their length, and nearly two thirds of duplicated blocks lacked TEs altogether. In addition, the edges of duplicated blocks tended to be located in TE-poor genomic regions. These results can be explained by the hypotheses: (1) that transposition events have occurred well after block duplication; (2) that TEs have frequently played a role in genomic rearrangement events in yeast. According to this model, duplicated blocks identifiable as such in the present-day yeast genome are found largely in regions with low TE density because in such regions the duplicated structure has not been obscured by TE-mediated rearrangements.

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Journal Article | Research Support, U.S. Gov't, P.H.S.
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Hughes AL, Friedman R
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