Superimposed histologic and genetic mapping of chromosome 17 alterations in human urinary bladder neoplasia

Oncogene
V ChaturvediBogdan Czerniak

Abstract

Multistep alterations of chromosome 17 in the progression of human urinary bladder neoplasia were studied by superimposed histologic and genetic mapping. The p53 gene was included in the analysis as a model tumor suppressor gene that is frequently involved in urothelial carcinogenesis. The strategy provided a systematic approach to the study of multistep genomic alterations that occur as neoplasia progresses from precursor intraurothelial conditions to invasive cancer. This was accomplished by sampling the entire mucosa of the organ and displaying microscopically identified invasive cancer and precursor conditions in the form of a histologic map. Subsequent isolation of DNA provided a set of samples in which the search for genetic alterations was performed and superimposed on the histologic map. This approach disclosed multifocal allelic losses of chromosome 17 in the early preinvasive phases of urothelial neoplasia. The alterations were predominantly confined to the p12-13, q22-11 and q24-25 regions. Mutations and allelic losses of the p53 gene were mapped to early preinvasive phases of urothelial neoplasia. The data provide detailed analysis of chromosome 17 allelic losses that occur in the development and progression of urot...Continue Reading

Citations

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