Characterization of germline mutations of MLH1 and MSH2 in unrelated south American suspected Lynch syndrome individuals

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Valentin, Mev Dominguez ^{[1, 2]} ; da Silva, Felipe Carneiro ^[1] ; Monteiro dos Santos, Erika Maria ^[3] ; Lisboa, Bianca Garcia ^[1] ; de Oliveira, Ligia Petrolini ^[1] ; Ferreira, Fabio de Oliveira ^[3] ; Gomy, Israel ^[1] ; Nakagawa, Wilson Toshihiko ^[3] ; Aguiar Junior, Samuel ^[3] ; Redal, Mariana ^[4] ; Vaccaro, Carlos ^[5] ; Della Valle, Adriana ^[6] ; Sarroca, Carlos ^[6] ; Carraro, Dirce Maria ^[1] ; Rossi, Benedito Mauro ^[3]

Afiliação do(s) autor(es)

^[1] AC Camargo Hosp, CIPE, Lab Genom & Mol Biol, Sao Paulo - Brazil

^[2] Lund Univ, Dept Oncol, S-22185 Lund - Sweden

^[3] AC Camargo Hosp, MsC PhD Program, Sao Paulo - Brazil

^[4] Hosp Italiano Buenos Aires, Coloproctol Dept, Buenos Aires, DF - Argentina

^[5] Hosp Italiano Buenos Aires, Hereditary Canc Program, Buenos Aires, DF - Argentina

^[6] Hosp Fuerzas Armadas, Montevideo - Uruguay

• Tipo de documento: Artigo Científico
• Fonte: FAMILIAL CANCER; v. 10, n. 4, p. 641-647, DEC 2011.
• Citações Web of Science: 20

Resumo

Lynch syndrome (LS) is an autosomal dominant syndrome that predisposes individuals to development of cancers early in life. These cancers are mainly the following: colorectal, endometrial, ovarian, small intestine, stomach and urinary tract cancers. LS is caused by germline mutations in DNA mismatch repair genes (MMR), mostly MLH1 and MSH2, which are responsible for more than 85% of known germline mutations. To search for germline mutations in MLH1 and MSH2 genes in 123 unrelated South American suspected LS patients (Bethesda or Amsterdam Criteria) DNA was obtained from peripheral blood, and PCR was performed followed by direct sequencing in both directions of all exons and intron-exon junctions regions of the MLH1 and MSH2 genes. MLH1 or MSH2 pathogenic mutations were found in 28.45% (34/123) of the individuals, where 25/57 (43.85%) fulfilled Amsterdam I, II and 9/66 (13.63%) the Bethesda criteria. The mutations found in both genes were as follows: nonsense (35.3%), frameshift (26.47%), splicing (23.52%), and missense (9%). Thirteen alterations (35.14%) were described for the first time. The data reported in this study add new information about MLH1 and MSH2 gene mutations and contribute to better characterize LS in Brazil, Uruguay and Argentina. The high rate of novel mutations demonstrates the importance of defining MLH1 and MSH2 mutations in distinct LS populations. (AU)

• Processo FAPESP: 08/57887-9 - Instituto Nacional de Oncogenômica
• Beneficiário: Luiz Paulo Kowalski
• Modalidade de apoio: Auxílio à Pesquisa - Temático