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Related Experiment Videos

A new xeroderma pigmentosum group C poly(AT) insertion/deletion polymorphism.

S G Khan1, E J Metter, R E Tarone

  • 1National Cancer Institute, National Institute of Aging and National Institute of Arthritis, Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, MD, USA.

Carcinogenesis
|October 7, 2000
PubMed
Summary

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Researchers identified common genetic variations in the xeroderma pigmentosum complementation group C (XPC) DNA repair gene. These XPC gene polymorphisms may aid in studying cancer susceptibility through molecular epidemiology.

Area of Science:

  • Genetics
  • Molecular Biology
  • Cancer Research

Background:

  • The xeroderma pigmentosum complementation group C (XPC) gene plays a crucial role in DNA repair pathways.
  • Genetic variations within DNA repair genes can influence an individual's susceptibility to cancer.

Purpose of the Study:

  • To identify and characterize common polymorphisms in the XPC DNA repair gene.
  • To assess the DNA repair capacity associated with these XPC polymorphisms.
  • To evaluate the potential utility of these polymorphisms in molecular epidemiological studies of cancer susceptibility.

Main Methods:

  • Developed a PCR assay to detect a common biallelic polymorphism (PAT) in the XPC gene, characterized by a poly(AT) insertion and intron 9 deletion.
  • Identified a single nucleotide polymorphism (SNP) in XPC exon 15 (A2920C) creating a new restriction site.

Related Experiment Videos

  • Utilized an allele-specific complementation assay with post-UV host cell reactivation to measure DNA repair capacity.

    • Main Results:

    • The PAT+ allele frequency was found to be between 0.36 and 0.44 in different donor populations.
    • The XPC exon 15 SNP (A2920C) occurred at a frequency of 0.38 and was in linkage disequilibrium with the PAT locus.
    • No significant difference in DNA repair capacity was observed between the XPC 2920A and XPC 2920C alleles.

    Conclusions:

    • Common polymorphisms exist in the XPC DNA repair gene.
    • These XPC gene polymorphisms do not appear to significantly alter DNA repair capacity.
    • The identified XPC polymorphisms may serve as valuable markers for future molecular epidemiological studies investigating cancer susceptibility.