A novel strategy for identifying differential gene expression: An improvedmethod of differential display analysis

We propose a novel alternative approach, an advanced method for recently de veloped strategies, for identifying differentially expressed genes, Firstly , double-stranded cDNAs were digested using Sau3AI and the 3'-end restricti on fragments of the cDNA were ligated to a double-stranded adapter. Next, t he restriction fragments were directly amplified using several combinations of adapter-specific primers and FITC-labeled oligo dT primers. The selecte d cDNA fragments were displayed on a polyacrylamide gel. Neither nested PCR nor purification of 3'-end fragments are necessary. We examined the validi ty of this approach by evaluating gene expression changes during granulocyt ic differentiation of HL-60 cells, This method can theoretically detect alm ost all gene expression changes more rapidly and through simpler manipulati ons than by any other approach. (C) 1999 Academic Press.