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  • Title: A novel point mutation in the tyrosine kinase domain of the RET proto-oncogene in sporadic medullary thyroid carcinoma and in a family with FMTC.
    Author: Eng C, Smith DP, Mulligan LM, Healey CS, Zvelebil MJ, Stonehouse TJ, Ponder MA, Jackson CE, Waterfield MD, Ponder BA.
    Journal: Oncogene; 1995 Feb 02; 10(3):509-13. PubMed ID: 7845675.
    Abstract:
    Germline mutations within one of six codons of the RET proto-oncogene account for the majority of cases of multiple endocrine neoplasia (MEN) type 2A and type 2B and familial medullary thyroid carcinoma (FMTC). MEN 2A and FMTC mutations characterised thus far occur exclusively in the cysteine-rich domain of the extracellular region of RET. We now report a missense mutation in the intracellular tyrosine kinase domain of RET in the germline of a family with FMTC that does not have a cysteine codon mutation. In this family, the mutation, which alters GAG (Glu) to GAC (Asp) at codon 768, segregates with the FMTC phenotype. The same mutation was also detected in sporadic MTC but not in corresponding constitutional DNA, confirming that it is likely to be of pathological significance rather than a rare polymorphism.
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