Immunohistochemical expression of p53 in breast carcinoma is associated with the intron 1 BglII polymorphism of the p53 gene.
Breast carcinoma is a public health problem worldwide. It is known that both genetic and environmental factors are important for breast carcinogenesis and that structural and/or functional alterations at p53 gene are commonly observed in breast tumors. In addition, polymorphisms of several genes in either their coding or non-coding sequences have been found related to cancer risk and/or clinicopathological characteristics of tumors. In this study we have evaluated the intron 1 BglII polymorphism of the p53 gene with a PCR-based approach in 117 cases of breast cancer and 102 healthy women and its association with the immunohistochemical expression of p53 in the tumors. The results showed that the presence of the polymorphism (allele 2) is highly associated with the tumor expression of p53 (p<0.0001) and that there is a trend for increased frequency of allele 2 in cases than in controls (p=0.2376). These data suggest that the germ-line variation in the intron 1 of the p53 gene could produce functional or structural changes of the protein that is reflected by its abnormal expression.
Trejo-Becerril
C
C
Basic Research, Instituto Nacional de Cancerologia, Mexico City, Mexico.
Sarmiento
R G
RG
Abad
M M
MM
Ichaso
N
N
Delgado
R
R
Cruz
J J
JJ
Dueñas-González
A
A
D001426:Bacterial Proteins; D001483:Base Sequence; D001943:Breast Neoplasms / Q000235:genetics*; D017931:DNA Primers; D015252:Deoxyribonucleases, Type II Site-Specific / Q000378:metabolism*; D016158:Genes, p53; D006801:Humans; D007150:Immunohistochemistry; D007438:Introns; D011110:Polymorphism, Genetic
D001426:Bacterial Proteins; D017931:DNA Primers; C024404:BglII endonuclease; D015252:Deoxyribonucleases, Type II Site-Specific