Impaired Regulation of Tumor Suppressor p53 Caused by Mutations in the Xeroderma Pigmentosum DDB2 Gene: Mutual Regulatory Interactions between p48DDB2 and p53

AUTOR(ES)

Itoh, Toshiki

FONTE

American Society for Microbiology

RESUMO

Tumor suppressor p53 controls cell cycle progression and apoptosis following DNA damage, thus minimizing carcinogenesis. Mutations in the human DDB2 gene generate the E subgroup of xeroderma pigmentosum (XP-E). We report here that XP-E strains are defective in UV irradiation-induced apoptosis due to severely reduced basal and UV-induced p53 levels. These defects are restored by infection with a p53 cDNA expression construct or with a DDB2 expression construct if and only if it contains intron 4, which includes a nonmutated p53 consensus-binding site. We propose that both before and after UV irradiation, DDB2 directly regulates p53 levels, while DDB2 expression is itself regulated by p53.

Documentos Relacionados

• p53 Binds and Activates the Xeroderma Pigmentosum DDB2 Gene in Humans but Not Mice
• The Xeroderma Pigmentosum Group E Gene Product DDB2 Is a Specific Target of Cullin 4A in Mammalian Cells
• p53 and DNA damage-inducible expression of the xeroderma pigmentosum group C gene
• Inhibition of p53 Tumor Suppressor by Viral Interferon Regulatory Factor
• Somatic mutations in the p53 tumor suppressor gene in rheumatoid arthritis synovium