APC mutation analysis by chemical cleavage of mismatch and a protein truncation assay in familial adenomatous polyposis - PubMed (original) (raw)
APC mutation analysis by chemical cleavage of mismatch and a protein truncation assay in familial adenomatous polyposis
J Prosser et al. Br J Cancer. 1994 Nov.
Free PMC article
Abstract
Overall, the causative APC mutation has been identified in only 30% of the patients with familial adenomatous polyposis (FAP) who have been included in studies reported in the literature. In order to determine the true frequency of detectable APC mutations, we set out to search exhaustively the entire coding region of APC for causative mutations in ten patients with classical FAP from Scottish kindreds shown to be linked to 5q markers. Chemical cleavage of mismatch analysis was employed as the initial screening technique. Mutations were confirmed by direct DNA sequencing and shown to generate a premature stop codon by an in vitro protein synthesis assay. Mutations resulting in a premature stop codon either by base substitution or by frameshift were identified in nine families. Although the remaining kindred was linked to intragenic APC markers with a lodscore of 1.69 at Zmax = 0.0, further analysis of DNA, RNA and chromosome spreads from the proband failed to detect any abnormality. This was despite employing single-strand conformation polymorphism (SSCP) analysis, heteroduplex analysis, DNA sequencing, reverse transcription-polymerase chain reaction (RT-PCR) analysis for splicing defects, a protein truncation test encompassing the entire APC gene and fluorescent in situ hybridisation chromosome analysis (FISH). These data show that 90% of these FAP kindreds had APC mutations detectable by chemical cleavage of mismatch and that none of the numerous other techniques employed could detect the mutation in the remaining kindred. This study shows the value of screening the APC gene using a combination of chemical cleavage of mismatch analysis and an in vitro protein truncation test.
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