Microsatellite instability and loss of heterozygosity in the nondysplastic colonic epithelium of ulcerative colitis

Seiichi Takahashi, Yasuhiro Kojima, Yoshitaka Kinouchi, Kenichi Negoro, Sho Takagi, Hiroyuki Aihara, Nobuya Obana, Keisuke Matsumoto, Nobuo Hiwatashi, Tooru Shimosegawa

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11 Citations (Scopus)


Background. A major longterm risk for patients with ulcerative colitis (UC) is the development of colorectal. dysplasia and cancer. Microsatellite instability (MI) has now been reported not only in colitic cancers but also in dysplasias, and even in nondysplastic inflamed mucosa. With the conventional microdissection technique, however, contamination by nonepithelial cells cannot be prevented and this could produce less reliable results than other methods. Therefore, we examined the condition of MI and loss of heterozygosity (LOH) of UC epithelium using a crypt isolation technique. Methods. One hundred and twenty-nine biopsy samples from 21 patients with UC were investigated for histology and microsatellite status, using nine microsatellite markers. A total of 1031 polymenase chain reaction (PCR) products were evaluated. Results. We found that no microsatellite markers displayed instability, but LOH at the 3p locus was detected in the nondysplastic epithelium of one patient with longstanding UC. Conclusions. Our study strongly suggests that MI does not contribute to the progression of the colitis-dysplasia sequence.

Original languageEnglish
Pages (from-to)734-739
Number of pages6
JournalJournal of Gastroenterology
Issue number8
Publication statusPublished - 2003 Aug 1


  • Crypt isolation technique
  • Loss of heterozygosity
  • Microsatellite instability
  • Ulcerative colitis


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