An?lise molecular dos ?xons 8 a 11 do gene da p53 em amostras de c?ncer de colo de ?tero no Rio Grande do Norte

• Main Author: Barbosa, Rodrigo Niskier Ferreira
• Other Authors: CPF:41434560015
• Format: Others
• Language: Portuguese
• Published: Universidade Federal do Rio Grande do Norte 2014
• Subjects: C?ncer de colo de ?tero; p53; DGGE; Cervical cancer; CNPQ::CIENCIAS BIOLOGICAS::GENETICA::GENETICA MOLECULAR E DE MICROORGANISMOS
• Online Access: http://repositorio.ufrn.br:8080/jspui/handle/123456789/16783

Made available in DSpace on 2014-12-17T15:18:13Z (GMT). No. of bitstreams: 1 RodrigoNFB.pdf: 1015725 bytes, checksum: 56b1b36bac123e4e6cada40e771e770f (MD5) Previous issue date: 2007-02-23 === Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior === Mutations on TP53 gene are common in human cancer but not in cervical cancer where they are rarely found and the inactivation and degradation of p53 protein are attributed to the action of E6 viral oncogene from high risk human papillomavirus (HPV). Analysis of cervical cancer cell lines suggests that HPV negative samples shows mutation on TP53, but clinical approaches didn t confirmed this hypothesis. However, in most TP53 mutations studies on cervical cancer, only the exons 5 to 8 were analyzed. Approximately 90% of mutations described are on this region. Recent studies on several cancer suggests that mutation frequency in the other exons must be considered. The aim of this work was to verify whether mutations on coding and non-coding regions occur in cancer tissue from cervical cancer in patients from Rio Grande do Norte using Denaturing Gradient Gel Electrophoresis (DGGE) as screening tool. Exons 8 to 11 were analyzed including some introns from 80 tumor samples and 8 peripheral blood samples from healthy women. DNA were submitted to PCR using primers with GC clamp on the end of one of them. The results were observed for each region after DGGE and silver staining. It was observed no amplified fragment with different migration profile from those obtained from DNA of peripheral blood. These results agree with those from literature where TP53 mutations in cervical cancer have been described in a very low frequency === As muta??es no TP53 s?o frequentes nos c?nceres humanos, mas n?o no c?ncer do colo do ?tero onde s?o raramente detectadas e a inativa??o e degrada??o da p53 ? atribu?da ? a??o do oncogene viral E6 dos papilomav?rus humanos (HPVs) de alto risco. A partir da an?lise de linhagens celulares de carcinoma cervical foi sugerido que carcinomas cervicais HPV negativos apresentavam muta??es no TP53, mas a an?lise de amostras cl?nicas n?o confirmou esta hip?tese. Entretanto, na maioria dos estudos de muta??es do TP53 no c?ncer de colo do ?tero foram analisados principalmente os ?xons 5 a 8, regi?o onde est?o localizadas cerca de 90% das muta??es descritas neste gene. Estudos recentes em diferentes tipos de c?ncer sugerem que a freq??ncia de muta??es nos demais ?xons do TP53 n?o ? desprez?vel. O objetivo deste trabalho foi verificar se ocorrem muta??es em regi?es codificantes e n?o codificantes do TP53 humano em amostras de tecido de c?ncer de colo do ?tero de pacientes no Rio Grande do Norte utilizando eletroforese em gel com gradiente de desnatura??o (DGGE) como t?cnica de triagem. Foram analisados os exons 8 a 11, incluindo alguns introns, de 80 amostras de tumor e 8 amostras de sangue perif?rico de mulheres saud?veis. O DNA obtido das amostras foi amplificado por PCR usando iniciadores com grampo GC na extremidade de um deles. Os resultados para cada regi?o foram visualizados ap?s DGGE e colora??o por nitrato de prata. N?o foram observadas bandas amplificadas com padr?o de migra??o diferente das obtidas de DNA de sangue perif?rico. Estes resultados est?o de acordo com os descritos na literatura onde muta??es no TP53 no c?ncer do colo do ?tero t?m sido descritas com freq??ncia muito baixa