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The proband was a 32-year-old man with sparse type of familial adenomatous polyposis with fundic gland and duodenal polyps and congenital hypertrophy of the retinal pigment epithelium without osteoma, dental abnormalities and desmoid tumors. Direct DNA sequencing did not detect germline mutations in any APC exon. However, using the multiplex ligation-dependent probe amplification method, we detected germline deletions of all APC exons. Using dual-color fluorescence in situ hybridization, we identified germline deletion of locus 5q22.1-22.2 that includes APC. Analysis of colorectal tumors identified somatic APC mutations in the cluster region in all polyps, but no loss of heterozygosity was detected in any polyp.

A Large Deletion of Chromosome 5q22.1-22.2 Associated with Sparse Type of Familial Adenomatous Polyposis: Report of a Case