Mutant cells defective in poly(ADP-ribose) synthesis due to stable alterations in enzyme activity or substrate availability

Experimental Cell Research
S ChatterjeeN A Berger

Abstract

We used two different approaches to develop cell lines deficient in poly(ADP-ribose) synthesis to help determine the role of this reaction in cellular functions. One approach to this problem was to develop cell lines deficient in enzyme activity; the other approach was to develop cell lines capable of growing with such low nicotinamide adenine dinucleotide (NAD) levels so as to effectively limit substrate availability for poly(ADP-ribose) synthesis. The selection strategy for obtaining cells deficient in activity of poly(ADP-ribose) polymerase was based on the ability of this enzyme to deplete cellular NAD in response to high levels of DNA damage. Using this approach, we first obtained cell lines having 37-82% enzyme activity compared to their parental cells. We now report the development and characterization of two cell lines which were obtained from cells having 37% enzyme activity by two additional rounds of further mutagenization and selection procedures. These new cell lines contain 5-11% enzyme activity compared to the parental V79 cells. In pursuit of the second strategy, to obtain cells which limit poly(ADP-ribose) synthesis by substrate restriction, we have now isolated spontaneous mutants from V79 cells which can grow...Continue Reading

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