Unscheduled DNA synthesis (excision-repair) of N-acetoxy-2-acetylaminofluorene (NA-AAF) damage to the DNA of human lymphocytes was determined quantitatively for 92 individuals with diastolic blood pressures ranging from 65 to 120 mm of Hg (8,7 to 16 kPa). Measurements of NA-AAF-induced repair synthesis (incorporation of[3H]thymidine in the presence of 10 mM hydroxyurea) showed linear increase w...

Fibroblast strains from 12 patients with xeroderma pigmentosum had lower than normal rates of DNA repair, as determined by autoradiographic studies of ultraviolet-induced unscheduled nuclear DNA synthesis. The nuclei in binuclear cells, obtained by fusing fibroblasts from certain pairs of these strains, had a greater rate of DNA repair than the nuclei of either strain's unfused mononuclear cell...

The effects of the treatment of cultured human and simian cells with Cadmium (Cd), a toxic and carcinogenic metal, were first assayed on macromolecular synthesis. It was observed that DNA synthesis was inhibited by Cd concentrations considerably lower than those inhibiting protein and RNA synthesis. Because of the necessary occurrence of a DNA resynthesis step during the DNA excision repair pro...

Defective DNA repair causes Fanconi anemia (FA), a rare childhood cancer-predisposing syndrome. At least 15 genes are known to be mutated in FA; however, their role in DNA repair remains unclear. Here, we show that the FANCJ helicase promotes DNA replication in trans by counteracting fork stalling on replication barriers, such as G4 quadruplex structures. Accordingly, stabilization of G4 quadru...

The Tax protein of human T-cell leukemia virus type 1 (HTLV-1) is a transcriptional transactivator and viral oncogene. Since cellular transformation has been frequently linked to alterations in genome stability, we investigated the effect of Tax on nucleotide excision repair (NER), a prominent cellular DNA repair pathway. Cells expressing Tax exhibited a reduced capacity for NER as measured by ...