Localization of a susceptibility locus for Peutz-Jeghers syndrome to 19p using comparative genomic hybridization and targeted linkage analysis

Nature Genetics
A HemminkiL A Aaltonen

Abstract

Many human cancer susceptibility genes have been successfully mapped by genetic linkage studies. One that has so far eluded researchers is that for Peutz-Jeghers (P-J) syndrome, a condition characterized by intestinal hamartomatous polyposis and melanin spots of the lips, buccal mucosa and digits. A dramatically elevated risk of malignancy has also been documented. Gastrointestinal tumours as well as cancers of the breast, ovary, testis and uterine cervix appear to be overrepresented in families with this syndrome. The nature of hamartomatous polyps is equivicol. Hamartomas are usually considered histologically benign, but in the case of Peutz-Jeghers patients, there are reports of adenomatous and malignant changes in the polyps, and the possibility of a hamartoma-carcinoma sequence has been discussed. A search for a putative tumour suppressor locus was made using comparative genomic hybridization (CGH) of Peutz-Jeghers polyps, combined with loss of heterozygosity (LOH) study. Genetic linkage analysis in 12 families using markers from a deletion site demonstrated the presence of a high-penetrance locus in distal 19p with a multipoint lod score of 7.00 at marker D19S886 without evidence of genetic heterogeneity. The study demons...Continue Reading

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