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- W2049695655 abstract "Simple tandem repeats represent more than 1% of the human genome: occasionally they exhibit intergenerational expansibility and are associated with neuromuscular diseases. In transgenic mice the same sequences elicit similar symptoms, but do not expand. We have searched for di-, tri-, and tetra-repeats in the published DNA sequences of chromosomes 21 and 22 of Homo sapiens, as well as in more than five megabases of Mus musculus DNA. Human and murine DNA sequences show a shortage in frequency and base coverage of tri-repeats as compared to di- and tetra-repeats. In murine sequences the cumulative frequency of di-, tri-, and tetra-repeats and their overall base coverage are about threefold higher than in human. Models for both the shortage of tri-repeats found in man and mouse and for their dynamic expansions are discussed. We propose that some of the 10 possible tri-repeats may be more prone than others to assume unusual structures capable of interfering with DNA synthesis: hence the shortage of tri-repeats. If such repeats are located at the 3'end of a chain growing and thus approaching another chain annealed to the same template, as Okazaki fragments do during discontinuous and encumbered replication, a combination of strand displacement, template switch, and branch migration may produce structures resistant to removal, hence the expansion of tri-repeats." @default.
- W2049695655 created "2016-06-24" @default.
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- W2049695655 date "2001-11-01" @default.
- W2049695655 modified "2023-09-27" @default.
- W2049695655 title "Triplet repeats, over-expanded in neuromuscular diseases, are under-represented in mammalian DNA: a survey of models" @default.
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- W2049695655 doi "https://doi.org/10.1016/s0361-9230(01)00581-0" @default.
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