title: p53 codon 72 polymorphism, DNA damage and repair, and risk of non-melanoma skin cancer.
abstract: A very common polymorphism of p53, that of codon 72, codes either for a proline (P72) or an arginine (R72). The two alleles differ in their biological properties: P72 is a stronger inducer of p21, while R72 induces 5-10 times more apoptosis. It is not known, however, whether this polymorphism influences genome stability. The influence of p53 codon 72 polymorphism on cancer risk has been studied for different types of cancer with mixed and inconsistent results. With respect to sporadic non-melanoma skin cancer (NMSC), there are few studies, with small sample sizes, and none in a Latinoamerican population. These studies have found no association between p53 genotype at codon 72 and NMSC. We analyzed whether p53 codon 72 genotype influences genomic stability and the sensitivity of cells to UVB. We also carried out a case-control study of NMSC in a Mexican population which included 204 BCC cases, 42 SCC cases, and 238 controls. There was no association between p53 genotype and basal levels of DNA damage, oxidative DNA damage sensitivity, or DNA repair capacity. R72 dominantly increased the in vitro sensitivity of cells to UVB-induced apoptosis. There was no significant association either between p53 genotype and basal cell carcinoma (BCC), squamous cell carcinoma (SCC) or both combined.
authors.affiliation: Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Mexico.
authors.forename: Andres
authors.initials: A
authors.lastname: Bendesky
authors.forename: Alejandra
authors.initials: A
authors.lastname: Rosales
authors.forename: Ana María
authors.initials: AM
authors.lastname: Salazar
authors.forename: Monserrat
authors.initials: M
authors.lastname: Sordo
authors.forename: Jorge
authors.initials: J
authors.lastname: Peniche
authors.forename: Patricia
authors.initials: P
authors.lastname: Ostrosky-Wegman
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D017209:Apoptosis / Q000235:genetics / Q000528:radiation effects; D001483:Base Sequence; D002280:Basal Cell Carcinoma / Q000235:genetics*; D002294:Carcinoma, Squamous Cell / Q000235:genetics*; D016022:Case-Control Studies; D003062:Codon / Q000235:genetics; D004249:DNA Damage / Q000235:genetics*; D017931:DNA Primers / Q000235:genetics; D004260:DNA Repair / Q000235:genetics*; D005260:Female; D016158:Genes, p53; D005838:Genotype; D006801:Humans; D066298:In Vitro Techniques; D008214:Lymphocytes / Q000166:cytology / Q000528:radiation effects; D008297:Male; D008800:Mexico; D008875:Middle Aged; D011110:Polymorphism, Genetic; D012307:Risk Factors; D012878:Skin Neoplasms / Q000235:genetics*; D014466:Ultraviolet Rays / Q000009:adverse effects
chemical_list: D003062:Codon; D017931:DNA Primers