Trinucleotide repetition and fragile X syndrome.

Abstract excerpt

Insufficiently appreciated as a cause of learning disability and other behavioral problems, fragile X syndrome accounts for almost 10% of inherited mental retardation. Identification of the specific mutation as a dramatic trinucleotide expansion inaugurates an era of accurate diagnosis, and goes far toward explaining the syndrome's inheritance patterns, in which risk varies as the disease descends through a family.

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