Linked Life Data

11182546

Source:http://linkedlifedata.com/resource/pubmed/id/11182546

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2001-2-22
pubmed:abstractText
Mutations in the XPD gene are associated with three complex clinical phenotypes, namely xeroderma pigmentosum (XP), XP in combination with Cockayne syndrome (XP-CS), and trichothiodystrophy (TTD). XP is caused by a deficiency in nucleotide excision repair (NER) that results in a high risk of skin cancer. TTD is characterized by severe developmental and neurological defects, with hallmark features of brittle hair and scaly skin, and sometimes has defective NER. We used CHO cells as a system to study how specific mutations alter the dominant/recessive behavior of XPD protein. Previously we identified the T46I and R75W mutations in two highly UV-sensitive hamster cell lines that were reported to have paradoxically high levels of unscheduled DNA synthesis. Here we report that these mutants have greatly reduced XPD helicase activity and fully defective NER in a cell-extract excision assay. We conclude that the unscheduled DNA synthesis seen in these mutants is caused by abortive "repair" that does not contribute to cell survival. These mutations, as well as the K48R canonical helicase-domain mutation, each produced codominant negative phenotypes when overexpressed in wild-type CHO cells. The common XP-specific R683W mutation also behaved in a codominant manner when overexpressed, which is consistent with the idea that this mutation may affect primarily the enzymatic activity of the protein rather than impairing protein interactions, which may underlie TTD. A C-terminal mutation uniquely found in TTD (R722W) was overexpressed but not to levels sufficiently high to rigorously test for a codominant phenotype. Overexpression of mutant XPD alleles may provide a simple means of producing NER deficiency in other cell lines.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0027-5107
pubmed:author
pubmed:issnType
Print
pubmed:day
7
pubmed:volume
485
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
153-68
pubmed:dateRevised
2010-11-18
pubmed:meshHeading
pubmed-meshheading:11182546-Animals, pubmed-meshheading:11182546-CHO Cells, pubmed-meshheading:11182546-Cell Line, pubmed-meshheading:11182546-Cell Survival, pubmed-meshheading:11182546-Cockayne Syndrome, pubmed-meshheading:11182546-Cricetinae, pubmed-meshheading:11182546-DNA, pubmed-meshheading:11182546-DNA Helicases, pubmed-meshheading:11182546-DNA Repair, pubmed-meshheading:11182546-DNA-Binding Proteins, pubmed-meshheading:11182546-Female, pubmed-meshheading:11182546-Gene Expression, pubmed-meshheading:11182546-Genes, Dominant, pubmed-meshheading:11182546-Hair Diseases, pubmed-meshheading:11182546-Mutation, pubmed-meshheading:11182546-Phenotype, pubmed-meshheading:11182546-Protein Biosynthesis, pubmed-meshheading:11182546-Proteins, pubmed-meshheading:11182546-Transcription, Genetic, pubmed-meshheading:11182546-Transcription Factors, pubmed-meshheading:11182546-Transfection, pubmed-meshheading:11182546-Xeroderma Pigmentosum, pubmed-meshheading:11182546-Xeroderma Pigmentosum Group D Protein
pubmed:year
2001
pubmed:articleTitle
Codominance associated with overexpression of certain XPD mutations.
pubmed:affiliation
Biology and Biotechnology Research Program, L441, Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA 94551-0808, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't