Cytogenetics and molecular genetics of carcinomas arising from thyroid epithelial follicular cells

Genes, Chromosomes & Cancer
M A PierottiG Sozzi

Abstract

Cytogenetic and molecular analyses of thyroid tumors have indicated that these neoplasms represent a good model for analyzing human epithelial cell multistep carcinogenesis. They comprise, in fact, a broad spectrum of lesions with different phenotypes and variable biological and clinical behavior. Molecular analysis has detected specific genetic alterations in the different types of thyroid tumors. In particular, the well-differentiated carcinomas of the papillary type are characterized by activation of the receptor tyrosine kinases (RTKs), RET and NTRK1 proto-oncogenes. Cytogenetic analysis of these tumors has contributed to defining the chromosomal mechanisms leading to RTK oncogenic activation. In the majority of cases, intrachromosomal inversions of chromosome 10 and chromosome 1 led to the formation of RET-derived and NTRK1-derived oncogenes, respectively. Interestingly, molecular analysis of these oncogenes revealed their nature of chimeric fusion proteins all sharing the tyrosine kinase (TK) domains of the respective proto-oncogenes. Moreover, the sequencing of the oncogenic rearrangements led to the identification of a breakpoint cluster region in both RTK proto-oncogenes. Exposure to ionizing radiation is associated wi...Continue Reading

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