PMID: 2508065Oct 11, 1989Paper

Comparison of RNase A, a chemical cleavage and GC-clamped denaturing gradient gel electrophoresis for the detection of mutations in exon 9 of the human acid beta-glucosidase gene

Nucleic Acids Research
B D TheophilusF I Smith

Abstract

Gaucher disease (GD), which results from mutations in the human acid beta-glucosidase (beta-Glc) gene, was used as a model system to compare the utility of three methods capable of detecting single base substitutions. PCR-amplified beta-Glc exon 9 sequences of GD patients were screened for single base mutations by GC-clamped denaturing gradient gel electrophoresis (DGGE) and RNase A cleavage of RNA-DNA heteroduplexes, and by chemical (hydroxylamine/osmium tetroxide) cleavage of dsDNA heteroduplexes. PCR products showing abnormal behaviour were cloned and sequenced. Three new point mutations were detected by this strategy. A G to C (Asp409 to His409) substitution was present in two Type 1 and one Type 3 GD patients; an A to T transversion (Asp409 to Val409) was detected in only a single Type 3 individual, and a G to T mutation (Val394 to Leu394) was present in one Type 1 and one Type 3 patient. GD thus exhibits extensive molecular heterogeneity, with at least five single base mutations in beta-Glc exon 9. In every case verified by ASO hybridization, DGGE had correctly identified the presence of the three new mutations, as well as the two previously described exon 9 mutations. In comparison, although RNase A and the chemical meth...Continue Reading

References

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Citations

Feb 1, 1995·Electrophoresis·A G Uitterlinden
Feb 1, 1993·Genes, Chromosomes & Cancer·E S AbramsL S Lerman
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