Evaluation of RET polymorphisms in a six-generation family with G533C RET mutation: specific RET variants may modulate age at onset and clinical presentation

Autor(es)

Tamanaha, Rosana ^{[1, 2]} ; Camacho, Cleber P. ^[1] ; Pereira, Alexandre C. ^[3] ; Alvares da Silva, Adriana M. ^[4] ; Maciel, Rui M. B. ^[2] ; Cerutti, Janete M. ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Paulo, Genet Bases Thyroid Tumors Lab, Div Genet, BR-04039032 Sao Paulo - Brazil

^[2] Univ Fed Sao Paulo, Div Endocrinol, BR-04039032 Sao Paulo - Brazil

^[3] Univ Sao Paulo, Sch Med, Heart Inst InCor, Sao Paulo - Brazil

^[4] Heliopolis Hosp, Head & Neck Serv, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CLINICAL ENDOCRINOLOGY; v. 71, n. 1, p. 56-64, JUL 2009.
• Citações Web of Science: 20

Resumo

P>Context We previously described a six-generation family with G533C RET mutation and medullary thyroid carcinoma, in the largest family reported do date. Of particular interest, phenotype variability regarding the age of onset and clinical presentation of the disease, was observed. Objective We evaluate whether single SNPs within RET oncogene or haplotype comprising the RET variants (defined by Haploview) could predispose to early development of MTC in this family and influence the clinical manifestation. Design Eight SNPs were selected based on their previous association with the clinical course of hereditary or sporadic MTC, in particular promoting an early onset of disease. The variants were initially tested in 77 G533C-carriers and 100 controls using either PCR-direct sequencing or PCR-RFLP. Association between a SNP or haplotype and age at diagnosis or presence of lymph node metastasis was tested in 34 G533C-carries with MTC. Different bioinformatic tools were used to evaluate the potential effects on RNA splicing. Results An association was found between IVS1-126G > T and age at diagnosis. The variant {[}IVS8 +82A > G; 85-86 insC] was associated with the presence of lymph node metastases at diagnosis. In silico analysis suggested that this variant may induce abnormal splicing. This in silico analysis predicted that the {[}IVS8 +82A > G; 85-86 insC] could alter the splicing by disrupting and/or creating exonic splicing enhancer motifs. Conclusions We here identified two RET variants that were associated with phenotype variability in G533C-carriers, which highlights the fact that the modifier effect of a variant might depend on the type of mutation. (AU)

• Processo FAPESP: 05/60330-8 - Marcadores moleculares no diagnóstico e prognóstico de pacientes com tumores da tiroide humana: transição da pesquisa básica para a clínica
• Beneficiário: Janete Maria Cerutti
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 06/60402-1 - Carcinoma medular da tiróide: revisitação à clínica, à biologia molecular, à bioquímica e à biologia do desenvolvimento depois dos achados da genética molecular
• Beneficiário: Rui Monteiro de Barros Maciel
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 04/15288-0 - Tumorigênese da tiróide humana: estudo funcional de mutações novas identificadas nos genes RET e BRAF e da re-expressão dos genes NESH e TARSH em linhagens celulares derivadas de carcinomas da tiróide humana
• Beneficiário: Janete Maria Cerutti
• Modalidade de apoio: Auxílio à Pesquisa - Regular