title: A specific genetic alteration on chromosome 6 in ulcerative colitis-associated colorectal cancers.
abstract: Various genetic alterations in ulcerative colitis (UC)-associated colorectal cancers (CRCs) have been reported. However, almost all studies have shown abnormalities of the known genes that have been demonstrated in sporadic CRCs. To identify novel genetic alterations, we selected unintentionally 35 microsatellite markers, and performed allelotype study in CRCs or dysplastic lesions from UC. High frequency of loss of heterozygosity (LOH; 62.5%) was detected on chromosome 6 (D6S468) but not on other chromosomes. With four additional microsatellite markers around the D6S468 locus, we determined the commonly deleted region between two loci, D6S1543 and D6S1580, in UC-associated CRCs and dysplasia. Interestingly, there was no LOH in this region in sporadic CRCs and severely inflamed lesions of longstanding and extensive UC without cancers. These results indicated the presence of novel tumor suppressor genes on chromosome 6 related to the carcinogenesis of UC but not to sporadic CRCs.
authors.affiliation: Department of Internal Medicine, School of Medicine, Keio University, Shinjuku-ku, Tokyo 160-8582, Japan.
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Ezaki
authors.forename: Mamoru
authors.initials: M
authors.lastname: Watanabe
authors.forename: Nagamu
authors.initials: N
authors.lastname: Inoue
authors.forename: Takanori
authors.initials: T
authors.lastname: Kanai
authors.forename: Haruhiko
authors.initials: H
authors.lastname: Ogata
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Iwao
authors.forename: Hiromasa
authors.initials: H
authors.lastname: Ishii
authors.forename: Toshifumi
authors.initials: T
authors.lastname: Hibi
mesh_terms: D000483:Alleles; D002869:Chromosome Aberrations; D002874:Chromosome Mapping; D002896:Chromosomes, Human, Pair 6; D003093:Colitis, Ulcerative / Q000150:complications / Q000235:genetics* / Q000473:pathology; D015179:Colorectal Neoplasms / Q000235:genetics* / Q000473:pathology; D005819:Genetic Markers; D006801:Humans; D019656:Loss of Heterozygosity
chemical_list: D005819:Genetic Markers