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We have combined a cDNA-driven PCR technique and a non-radioactive chemical-cleavage mismatch method, followed by a direct sequencing for detecting small mutations in the human hypoxanthine-guanine phosphoribosyl transferase (HPRT) gene. HPRT cDNA was synthesized by RT-PCR from 1,000 wild-type or HPRT(-) mutant cells. Wild-type cDNA was hybridized with mutant cDNA to form heteroduplexes. The resultant mismatched bases were modified and cleaved by base-specific chemicals, followed by analysis by denaturing polyacrylamide gel electrophoresis. Cleaved fragments were detected without using radioactive materials. Finally, direct sequencing of the PCR products was performed with a focus on a small limited region indicated by the mismatch analysis (focused sequencing). In this study, three small mutations in exon-3 of HPRT cDNA were detected and characterized completely with this system. As compared with the radioactive method, this system was shown to be very simple and efficient.

NON-RADIOACTIVE MISMATCH ANALYSIS TO DETECT SMALL MUTATIONS IN HUMAN HYPOXANTHINE-GUANINE PHOSPHORIBOSYL TRANSFERASE cDNA