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TP53 mutations and loss of heterozygosity of chromosome 17 in colorectal tumors

Abstract

The incidence of TP53 point mutations and loss of heterozygosity (LOH) of chromosome 17 in colorectal tumors was determined in a group of Brazilian patients. We screened DNA samples from tumors and distal normal mucosa of 39 patients with colorectal cancer, for TP53 mutations by PCR-SSCP (single-strand conformation polymorphism) analysis. Chromosome 17 LOH was investigated using six PCR-based polymorphic markers and one VNTR probe. TP53 mutations were demonstrated in 15/39 of the cases. Mutations were distributed among all exons examined (five to eight), the majority of them being G/C to A/T transitions. LOH of chromosome 17p and 17q was detected in 70 and 46% of the tumors, respectively. There was a significant association between TP53 mutations and LOH in chromosome 17p (P = 0.0035) and 17q (P = 0.03). Although no correlation was observed between TP53 genetic alterations and clinical/ pathological characteristics, the association of TP53 mutations with loss of both chromosome 17 arms may indicate that TP53 inactivation provokes an unstable phenotype in tumor cells in colorectal tumors.

TP53 mutations; heterozygosity; chromosome 17; colorectal tumors


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TP53 mutations and loss of heterozygosity of chromosome 17 in colorectal tumors

Lidia YamamotoI; Ademar A. Lopes II; Angelito Harb-GamaIII; Maria A. NagaiI

IDisciplina de Oncologia, Departamento de Radiologia, Faculdade de Medicina, Universidade de São Paulo, Av. Dr. Arnaldo 455, 40 andar, 01246-093 São Paulo, SP, Brasil. Fax: (55) (11) 282-6580. Send correspondence to M.A.N.

IIFundação Antônio Prudente, São Paulo, SP, Brasil

IIIDepartamento de Gastroenterologia, Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brasil

ABSTRACT

The incidence of TP53 point mutations and loss of heterozygosity (LOH) of chromosome 17 in colorectal tumors was determined in a group of Brazilian patients. We screened DNA samples from tumors and distal normal mucosa of 39 patients with colorectal cancer, for TP53 mutations by PCR-SSCP (single-strand conformation polymorphism) analysis. Chromosome 17 LOH was investigated using six PCR-based polymorphic markers and one VNTR probe. TP53 mutations were demonstrated in 15/39 of the cases. Mutations were distributed among all exons examined (five to eight), the majority of them being G/C to A/T transitions. LOH of chromosome 17p and 17q was detected in 70 and 46% of the tumors, respectively. There was a significant association between TP53 mutations and LOH in chromosome 17p (P = 0.0035) and 17q (P = 0.03). Although no correlation was observed between TP53 genetic alterations and clinical/ pathological characteristics, the association of TP53 mutations with loss of both chromosome 17 arms may indicate that TP53 inactivation provokes an unstable phenotype in tumor cells in colorectal tumors.

Keywords: TP53 mutations; heterozygosity; chromosome 17; colorectal tumors.

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Publication Dates

  • Publication in this collection
    26 Oct 2006
  • Date of issue
    1996
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