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Haplotypic determinants of instability in the FRAX region: Concatenated mutation or founder effect?

, : Haplotypic determinants of instability in the FRAX region: Concatenated mutation or founder effect?. Human Mutation 18(1): 61-69

The fragile X triplet repeat expansion at Xq27.3 has been shown to be associated with mutation or instability 600 kb distal at the FMR2 repeat locus. Concatenated mutation, whereby a mutation at one locus somehow interacts with mutation, recombination, deletion, or transposition at another locus, is a possible explanation. In this study we examine evidence from a sample of over 7,000 independent haplotypes from the FRAX region. We adopt the use of cladistic groups to more thoroughly define the properties of these haplotypes, and in doing so isolate one group of haplotypes which may be predisposed to the phenomenon of concatenated mutation. Distinguishing concatenated mutation from founder effects is difficult within a single population. We present our evidence for and against concatenated mutation, and in the process describe a previously undefined mutation at FRAXE.


PMID: 11438994

DOI: 10.1002/humu.1150

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