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      Mechanisms of trinucleotide repeat instability during human development.

      Nature reviews. Genetics
      Animals, Chromosomal Instability, genetics, Female, Growth and Development, Human Development, physiology, Humans, Male, Mice, Models, Biological, Saccharomyces cerevisiae, Spermatogonia, metabolism, Trinucleotide Repeat Expansion, Trinucleotide Repeats

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          Abstract

          Trinucleotide expansion underlies several human diseases. Expansion occurs during multiple stages of human development in different cell types, and is sensitive to the gender of the parent who transmits the repeats. Repair and replication models for expansions have been described, but we do not know whether the pathway involved is the same under all conditions and for all repeat tract lengths, which differ among diseases. Currently, researchers rely on bacteria, yeast and mice to study expansion, but these models differ substantially from humans. We need now to connect the dots among human genetics, pathway biochemistry and the appropriate model systems to understand the mechanism of expansion as it occurs in human disease.

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