Xeroderma pigmentosum complementation group C cells remove pyrimidine dimers selectively from the transcribed strand of active genes

Journal Article · Thu Aug 01 00:00:00 EDT 1991 · Molecular and Cellular Biology; (United States)

DOI:https://doi.org/10.1128/MCB.11.8.4128· OSTI ID:5197686

Venema, J; van Hoffen, A; Karcagi, V; Natarajan, A T; van Zeeland, A A; Mullenders, L H ^[1]

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1. State Univ. of Leiden (Netherlands)

The authors have measured the removal of UV-induced pyrimidine dimers from DNA fragments of the adenosine deaminase (ADA) and dihydrofolate reductase (DHFR) genes in primary normal human and xeroderma pigmentosum complementation group C (XP-C) cells. Using strand-specific probes, we show that in normal cells, preferential repair of the 5{prime} part of the ADA gene is due to the rapid and efficient repair of the transcribed strand. Within 8 h after irradiation with UV at 10 J m-2, 70% of the pyrimidine dimers in this strand are removed. The nontranscribed strand is repaired at a much slower rate, with 30% dimers removed after 8 h. Repair of the transcribed strand in XP-C cells occurs at a rate indistinguishable from that in normal cells, but the nontranscribed strand is not repaired significantly in these cells. Similar results were obtained for the DHFR gene. In the 3{prime} part of the ADA gene, however, both normal and XP-C cells perform fast and efficient repair of either strand, which is likely to be caused by the presence of transcription units on both strands. The factor defective in XP-C cells is apparently involved in the processing of DNA damage in inactive parts of the genome, including nontranscribed strands of active genes. These findings have important implications for the understanding of the mechanism of UV-induced excision repair and mutagenesis in mammalian cells.

• OSTI ID: 5197686
• Journal Information: Molecular and Cellular Biology; (United States), Vol. 11:8; ISSN 0270-7306
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
HYDROLASES
GENES
OXIDOREDUCTASES
PYRIMIDINE DIMERS
REMOVAL
XP CELLS
EXCISION REPAIR
BIOLOGICAL RADIATION EFFECTS
DNA
MAN
TRANSCRIPTION
ULTRAVIOLET RADIATION
XERODERMA PIGMENTOSUM
ANIMAL CELLS
ANIMALS
BIOLOGICAL EFFECTS
BIOLOGICAL RECOVERY
BIOLOGICAL REPAIR
DISEASES
DNA REPAIR
ELECTROMAGNETIC RADIATION
ENZYMES
MAMMALS
NUCLEIC ACIDS
ORGANIC COMPOUNDS
PRIMATES
RADIATION EFFECTS
RADIATIONS
RECOVERY
REPAIR
SKIN DISEASES
VERTEBRATES
560120* - Radiation Effects on Biochemicals
Cells
& Tissue Culture