Precursor arrays for triplet repeat expansion at the fragile X locus.

Abstract:

:To determine factors governing triplet repeat expansion at FMR1, we need to understand the basis of normal variation. We have sequenced the FMR1 repeat from 102 normal X chromosomes and show that most are interrupted with a regularly spaced AGG trinucleotide giving an ordered structure to the array. Five types of arrays were identified consisting of varying numbers of a core unit with consensus [AGG(CGG)9]. Additional variation in the length of the (CGG)n portion within each unit generates the continuum of lengths seen on normal chromosomes. Ten per cent contain long, uninterrupted tracts of (CGG)n, and their lengths suggest they have arisen by the loss of AGG triplets from longer interrupted arrays. Haplotype analysis of arrays carrying long, uninterrupted (CGG)n tracts suggests that they occur more frequently on genetic backgrounds which are more highly represented on fragile X chromosomes. These arrays may well be precursors from which the larger fragile X associated arrays have arisen by further expansion.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Hirst MC,Grewal PK,Davies KE

doi

10.1093/hmg/3.9.1553

subject

Has Abstract

pub_date

1994-09-01 00:00:00

pages

1553-60

issue

9

eissn

0964-6906

issn

1460-2083

journal_volume

3

pub_type

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