Cloning, comparative mapping, and RNA expression of the mouse homologues of the Saccharomyces cerevisiae nucleotide excision repair gene RAD23

Journal Article · Mon Jan 01 04:00:00 EST 1996 · Genomics

DOI:https://doi.org/10.1006/geno.1996.0004· OSTI ID:478829

Spek, P.J. van der; Visser, C E; Bootsma, D ^[1]

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1. Erasmus Univ., Rotterdam (Netherlands); and others

The Saccharomyces cerevisiae RAD23 gene is involved in nucleotide excision repair (NER). Two human homologs of RAD23, HHR23A and HHR23B (HGMW-approved symbols RAD23A and RAD23B), were previously isolated. The HHR23B protein is complexed with the protein defective in the cancer-prone repair syndrome xeroderma pigmentosum, complementation group C, and is specifically involved in the global genome NER subpathway. The cloning of both mouse homologs (designated MHR23A and MHR23B) and detailed sequence comparison permitted the deduction of the following overall structure for all RAD23 homologs: an ubiquitin-like N-terminus followed by a strongly conserved 50-amino-acid domain that is repeated at the C-terminus. We also found this domain as a specific C-terminal extension of one of the ubiquitin-conjugating enzymes, providing a second link with the ubiquitin pathway. By means of in situ hybridization, MHR23A was assigned to mouse chromosome 8C3 and MHR23B to 4B3. Because of the close chromosomal proximity of human XPC and HHR23B, the mouse XPC chromosomal location was determined (6D). Physical disconnection of the genes in mouse argues against a functional significance of the colocalization of these genes in human. Northern blot analysis revealed constitutive expression of both MHR23 genes in all tissues examined. Elevated RNA expression of both MHR23 genes was observed in testis. Although the RAD23 equivalents are well conserved during evolution, the mammalian genes did not express the UV-inducible phenotype of their yeast counterpart. This may point to a fundamental difference between the UV responses of yeast and human. No stage-specific mRNA expression during the cell cycle was observed for the mammalian RAD23 homologs. 38 refs., 5 figs.

• OSTI ID: 478829
• Journal Information: Genomics, Journal Name: Genomics Journal Issue: 1 Vol. 31; ISSN 0888-7543; ISSN GNMCEP
• Country of Publication: United States
• Language: English

Related Subjects

55 BIOLOGY AND MEDICINE
BASIC STUDIES
56 BIOLOGY AND MEDICINE
APPLIED STUDIES
AMINO ACIDS
BIOLOGICAL EVOLUTION
CHROMOSOMES
DNA HYBRIDIZATION
DNA REPAIR
DNA SEQUENCING
DNA-CLONING
GENE REGULATION
GENES
GENETIC MAPPING
GENETIC RADIATION EFFECTS
HEREDITARY DISEASES
MAMMALS
MESSENGER-RNA
MICE
PHENOTYPE
SACCHAROMYCES CEREVISIAE
SKIN DISEASES
STRUCTURE-ACTIVITY RELATIONSHIPS
ULTRAVIOLET RADIATION