Abstract
Injection of Fanconi anaemia (complementation group A) fibroblasts with HeLa mRNA is shown to correct their abnormal response to a psoralen cross-linking challenge, namely permanent repression of DNA synthesis. Injection of gradient-fractionated mRNA led to identification of a single fraction, containing mRNA of approximately 650 bases, which is responsible for this effect. This finding suggests that Fanconi anaemia (group A) cells are deficient in a small protein, up to 20 kDa in size, which is involved in the cellular response to DNA interstrand cross-links.
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