Genetic and epigenetic alterations of netrin-1 receptors in gastric cancer with chromosomal instability

Keisuke Toda, Takeshi Nagasaka, Yuzo Umeda, Takehiro Tanaka, Takashi Kawai, Tomokazu Fuji, Fumitaka Taniguchi, Kazuya Yasui, Nobuhito Kubota, Yuko Takehara, Hiroshi Tazawa, Shunsuke Kagawa, Dong Sheng Sun, Naoshi Nishida, Ajay Goel, Toshiyoshi Fujiwara

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Abstract

Background: The gene expressions of netrin-1 dependence receptors, DCC and UNC5C, are frequently downregulated in many cancers. We hypothesized that downregulation of DCC and UNC5C has an important growth regulatory function in gastric tumorigenesis. Results: In the present study, a series of genetic and epigenetic analyses for DCC and UNC5C were performed in a Japanese cohort of 98 sporadic gastric cancers and corresponding normal gastric mucosa specimens. Loss of heterozygosity (LOH) analyses and microsatellite instability (MSI) analysis was applied to determine chromosomal instability (CIN) and MSI phenotypes, respectively. More than 5 % methylation in the DCC and UNC5C promoters were found in 45 % (44/98) and 32 % (31/98) gastric cancers, respectively, and in 9 % (9/105) and 5 % (5/105) normal gastric mucosa, respectively. Overall, 70 % (58 of 83 informative cases) and 51 % (40 of 79 informative cases) of gastric cancers harbored either LOH or aberrant methylation in the DCC and UNC5C genes, respectively. In total, 77 % (51 of 66 informative cases) of gastric cancers showed cumulative defects in these two dependence receptors and were significantly associated with chromosomal instability. Both DCC and UNC5C were inactivated in 97 % of CIN-positive gastric cancers and in 55 % of CIN-negative gastric cancers. Conclusions: Defect in netrin receptors is a common feature in gastric cancers. DCC alterations are apparent in the early stages, and UNC5C alterations escalate with the progression of the disease, suggesting that the cumulative alterations of netrin-1 receptors was a late event in gastric cancer progression and emphasizing the importance of this growth regulatory pathway in gastric carcinogenesis.

Original languageEnglish
Article number73
JournalClinical Epigenetics
Volume7
Issue number1
DOIs
Publication statusPublished - Jul 23 2015

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Keywords

  • Chromosomal instability
  • DCC
  • Gastric cancer
  • Methylation
  • Netrin-1 receptors
  • UNC5C

ASJC Scopus subject areas

  • Genetics
  • Molecular Biology
  • Developmental Biology
  • Genetics(clinical)

Cite this

Toda, K., Nagasaka, T., Umeda, Y., Tanaka, T., Kawai, T., Fuji, T., Taniguchi, F., Yasui, K., Kubota, N., Takehara, Y., Tazawa, H., Kagawa, S., Sun, D. S., Nishida, N., Goel, A., & Fujiwara, T. (2015). Genetic and epigenetic alterations of netrin-1 receptors in gastric cancer with chromosomal instability. Clinical Epigenetics, 7(1), [73]. https://doi.org/10.1186/s13148-015-0096-y