期刊
JOURNAL OF INVESTIGATIVE DERMATOLOGY
卷 115, 期 6, 页码 974-980出版社
BLACKWELL SCIENCE INC
DOI: 10.1046/j.1523-1747.2000.00190.x
关键词
cancer genetics; DNA polymorphism; DNA repair; skin cancer; sun protection
类别
资金
- Intramural NIH HHS [Z01 BC004517-31] Funding Source: Medline
An Ashkenazi Jewish Israeli family with two children affected with severe xeroderma pigmentosum was investigated, A son, XP12TA, developed skin cancer at 2 y and died at 10 y. A daughter, XP25TA, now 24 y old, was sun protected and began developing skin cancers at 10 y. Their cultured skin fibroblasts showed reductions in post-ultraviolet survival (11% of normal), unscheduled DNA synthesis (10% of normal), global genome DNA repair (15% of normal), and plasmid host cell reactivation (5% of normal). Transcription-coupled DNA repair was normal, however, Northern blot analysis revealed greatly reduced xeroderma pigmentosum complementation group C mRNA, A plasmid host cell reactivation assay assigned the cells to xeroderma pigmentosum complementation group C, Cells from both parents and an unaffected child exhibited normal post-ultraviolet-C survival and normal DNA repair. Sequencing the xeroderma pigmentosum complementation group C cDNA of XP12TA and XP25TA revealed a homozygous deletion of two bases (del AT 669-670) in exon 5 with a new termination site 10 codons downstream that is expected to encode a truncated xeroderma pigmentosum complementation group C protein. Sequence analysis of the xeroderma pigmentosum complementation group C cDNA in cells from the parents found identical heterozygous mutations: one allele carries both the exon 5 frameshift and an exon 15 polymorphism and the other allele carries neither alteration. Cells from the unaffected brother had two normal xeroderma pigmentosum complementation group C alleles, This frameshift mutation in the xeroderma pigmentosum complementation group C gene led to reduced DNA repair with multiple skin cancers and early death. Sun protection delayed the onset of skin cancer and prolonged Life in a sibling with the same mutation.
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