A novel duplication in the FMR1 gene: implications for molecular analysis in fragile X syndrome and repeat instability.

Abstract:

:We have observed a 49 bp tandem duplication adjacent to the triplet repeat of the FMR1 gene and have shown it to occur as a variant in Finland. It affects the primers commonly used in molecular analysis of fragile X syndrome by polymerase chain reaction (PCR) methods. One concern is that females with the full mutation and variant alleles might be missed because of the two PCR products generated by the variant. We suggest that the duplication has arisen by a misalignment of the proximal end of the repeat tract and the non-adjacent GGCGGCGGCGG-sequence located 37 bp upstream and may indicate a mutation hot spot. The discovery of this duplication and the previous observations on deletions associated with full mutations in FMR1 indicate that realignment between the repeat tract and dispersed non-adjacent homologous repetitive sequences may also play a role in repeat instability in fragile X.

journal_name

Clin Genet

journal_title

Clinical genetics

authors

Mononen T,von Koskull H,Airaksinen RL,Juvonen V

doi

10.1111/j.1399-0004.2007.00903.x

subject

Has Abstract

pub_date

2007-12-01 00:00:00

pages

528-31

issue

6

eissn

0009-9163

issn

1399-0004

pii

CGE903

journal_volume

72

pub_type

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