Stability of triplet repeats of myotonic dystrophy and fragile X loci in human mutator mismatch repair cell lines View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1996-07

AUTHORS

Phillip R. Kramer, Christopher E. Pearson, R. R. Sinden

ABSTRACT

At least nine human genetic diseases, including myotonic dystrophy (DM) and fragile X syndrome have been associated with the expansion of CTG or CGG trinucleotide repeats within the disease loci. Little is known about the molecular mechanisms or the genetic control of the expansion of triplet repeats. Mutations in human mismatch repair genes are associated with the increased polymorphism of many microsatellites, including dinucleotide repeats. The effect of mutations in two mismatch repair genes on the size of trinucleotide repeats in the DM and FRAXA loci has been analyzed. PCR and Southern analysis of the triplet repeat regions of the DM and fragile X mental retardation (FRAXA) loci in cell lines HTC116 and LoVo, which contain mutations in both alleles of the hMLH1 and hMSH2 genes, respectively, indicated that the size of the endogenous (CTG)n and (CGG)n tracts fall within the range observed in the normal population. This suggests that mutations in hMLH1 or hMSH2 do not result in the instability of CTG or CGG tracts to the levels observed in individuals with myotonic dystrophy or fragile X syndrome. More... »

PAGES

151-157

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s004390050179

DOI

http://dx.doi.org/10.1007/s004390050179

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1032207992

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/8698331


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