Post-treatment of mutagen-treated human peripheral lymphocytes with a single-strand specific endonuclease from Neurospora crassa leads to a significant elevation of the rate of structural chromosomal aberrations. Our results indicate that DNA double-strand breaks (DSB) are ultimate lesions for the f
The effect of caffeine posttreatment of X-ray-induced chromosomal aberrations in human blood lymphocytes in vitro
β Scribed by A. T. Natarajan; G. Obe; F. N. Dulout
- Publisher
- Springer
- Year
- 1980
- Tongue
- English
- Weight
- 559 KB
- Volume
- 54
- Category
- Article
- ISSN
- 0340-6717
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β¦ Synopsis
The potentiating effect of caffeine on X-ray-induced chromosomal aberrations in human blood lymphocytes has been investigated, with special reference to cell cycle stages (G0 and G2). Both quantitative and qualitative differences in the yield of chromosomal aberrations were detected in caffeine-posttreated cells, depending on the cell stage irradiated. The studies on caffeine potentiating effects on X-irradiated G0 lymphocytes from normal adults, newborns, Down syndrome patients, and an ataxia telangiectasia patient pointed to interindividual variations in the response to caffeine potentiation among normal probands and a very profound effect in ataxia cells.
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The effect of post-treatments with caffeine in G2 on the frequency of X-ray-induced chromatid aberrations was studied in normal and ataxia telangiectasia (A-T) fibroblast and lymphoblastoid cells. Caffeine was found to potentiate the X-ray-induced aberration yield in both normal fibroblast and lymph
## Abstract Unstimulated lymphocytes from individuals with Down Syndrome (trisomy 21) are more sensitive to the induction of dicentric and ring aberrations by X rays than normal lymphocytes. Several explanations involving the more rapid rejoining of Xβrayβinduced lesions in Down cells have been off