Expression of a DNA‐ligase‐stimulatory factor in Bloom's syndrome cell line GM1492

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Abstract
An increased DNA ligase activity is observed in extracts of Bloom''s syndrome (BS) fibroblast cell line GM1492. The activity is 2-3-fold higher in this cell line compared to normal human fibroblasts, and 5-20-fold higher than in three other BS cell lines investigated. The DNA ligase activity in GM1492 cells is promoted by a heat-resistant, protease-sensitive factor comigrating with DNA ligases on single-stranded-DNA-cellulose. The factor stimulates DNA ligase I as well as DNA ligase II, and is not identical to the activity-promoting homologous DNA pairing, which is also enhanced in GM1492 cell extracts.