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Accumulated frameshift mutations at coding nucleotide repeats during the progression of gastric carcinoma with microsatellite instability

 Jung Jin Kim  ;  Myung Jin Baek  ;  Lucia Kim  ;  Nam Gyun Kim  ;  Yong Chan Lee  ;  Si Young Song  ;  Sung Hoon Noh  ;  Hoguen Kim 
 Laboratory Investigation, Vol.79(9) : 1113-1120, 1999 
Journal Title
 Laboratory Investigation 
Issue Date
Adenoma/genetics* ; Adenoma/pathology ; Carcinoma/genetics* ; Carcinoma/pathology ; DNA-Binding Proteins/genetics ; Disease Progression ; E2F4 Transcription Factor ; Female ; Frameshift Mutation* ; Genetic Code ; Humans ; Male ; Melanocyte-Stimulating Hormones/genetics ; Microsatellite Repeats* ; Neoplasm Proteins/genetics ; Proto-Oncogene Proteins/genetics ; Proto-Oncogene Proteins c-bcl-2* ; Receptor, IGF Type 2/genetics ; Stomach Neoplasms/genetics* ; Stomach Neoplasms/pathology ; Transcription Factors/genetics ; Transforming Growth Factor beta/genetics ; bcl-2-Associated X Protein
Microsatellite instability (MSI) and frameshift mutations in genes containing nucleotide repeats have been reported in a subset of gastric carcinomas, but the mutational profiles in precancerous lesions have not been characterized. To characterize the genetic events during gastric carcinogenesis, we analyzed DNA from 56 gastric adenomas and 167 gastric carcinomas for MSI using five microsatellite markers and for frameshift mutations at coding nucleotide repeats of the type II transforming growth factor beta receptor, BAX, hMSH3, hMSH6, IGF II receptor, and E2F-4 genes. On the basis of the number of markers displaying instability per tumor, the tumors were divided into three groups: those with two or more of the five markers showing instability (high MSI [MSI-H]), those with one of the five markers showing instability (low MSI [MSI-L]), and those with no instability. MSI-H was found in 8 adenomas (14%) and 19 carcinomas (11%), and MSI-L was found in 8 adenomas (14%) and 9 carcinomas (5%). These groups were tested for correlations with several clinicopathologic parameters. MSI-H gastric adenomas were related to the high histologic grade of composing dysplastic glands (p = 0.004), and MSI-H gastric carcinomas were associated with exophytic tumor growth (p = 0.005). We found 48 frameshift mutations at coding nucleotide repeats of the six genes, and all mutations except one were found in MSI-H gastric tumors. Only one of the 17 MSI-L tumors showed frameshift mutations at coding nucleotide repeats of the transforming growth factor beta receptor II gene. Compared with MSI-H gastric carcinomas, MSI-H adenomas had no mutations in the hMSH6 and the IGF II receptor genes, less frequent mutations in the transforming growth factor beta receptor II (38% versus 63%), BAX (13% versus 37%), and hMSH3 (13% versus 37%) genes, and more frequent mutations in the E2F-4 (50% versus 37%) gene. Our findings suggest that MSI and E2F-4 mutations are early genetic events and that mutations of the other five genes are accumulated during the progression of gastric carcinomas with MSI.
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Yonsei Authors
Noh, Sung Hoon(노성훈) ORCID logo https://orcid.org/0000-0003-4386-6886
Song, Si Young(송시영) ORCID logo https://orcid.org/0000-0002-1417-4314
Lee, Yong Chan(이용찬) ORCID logo https://orcid.org/0000-0001-8800-6906
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