title: Mutations in the ST7/RAY1/HELG locus rarely occur in primary colorectal, gastric, and hepatocellular carcinomas.
abstract: Human cancers frequently show a loss of heterozygosity on chromosome 7q31, which indicates the existence of broad-range tumour-suppressor gene(s) at this locus. Truncating mutations in the ST7 gene at this locus are seen frequently in primary colon cancer and breast cancer cell lines. Therefore, the ST7 gene represents a novel candidate gene for the tumour suppressor at this locus. However, more recent studies have reported that ST7 mutations are infrequent or absent in primary cancer and cell lines. To ascertain the frequency of mutations of the ST7 gene in cancer cells, we examined mutations in the ST7 coding sequence in 48 colorectal, 48 gastric, and 48 hepatocellular carcinomas using polymerase chain reaction-single-strand conformational polymorphism and direct sequencing. We detected somatic mutations, which were located near the exon-intron junction in intron 8, in only three out of 144 cases. We conclude that mutations in the ST7 gene are rare in primary colorectal, gastric, and hepatocellular carcinomas.
authors.affiliation: Second Department of Surgery, Gunma University Faculty of Medicine, 3-39-15, Showa-machi, Maebashi, Gunma 371-8511, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Yoshimura
authors.forename: T
authors.initials: T
authors.lastname: Yamada
authors.forename: S
authors.initials: S
authors.lastname: Ohwada
authors.forename: T
authors.initials: T
authors.lastname: Koyama
authors.forename: K
authors.initials: K
authors.lastname: Hamada
authors.forename: K
authors.initials: K
authors.lastname: Tago
authors.forename: I
authors.initials: I
authors.lastname: Sakamoto
authors.forename: I
authors.initials: I
authors.lastname: Takeyoshi
authors.forename: T
authors.initials: T
authors.lastname: Ikeya
authors.forename: F
authors.initials: F
authors.lastname: Makita
authors.forename: Y
authors.initials: Y
authors.lastname: Iino
authors.forename: Y
authors.initials: Y
authors.lastname: Morishita
mesh_terms: D001426:Bacterial Proteins; D006528:Carcinoma, Hepatocellular / Q000235:genetics*; D015179:Colorectal Neoplasms / Q000235:genetics; D004252:DNA Mutational Analysis; D005787:Gene Frequency; D006801:Humans; D008113:Liver Neoplasms / Q000235:genetics*; D018895:Microsatellite Repeats; D009154:Mutation; D018807:Polymorphism, Single-Stranded Conformational; D011506:Proteins / Q000235:genetics*; D013274:Stomach Neoplasms / Q000235:genetics*; D025521:Tumor Suppressor Proteins
chemical_list: D001426:Bacterial Proteins; C110124:PctA protein, Pseudomonas aeruginosa; D011506:Proteins; C412123:ST7 protein, human; D025521:Tumor Suppressor Proteins