Potential antifolate resistance determinants and genotypic variation in the bifunctional dihydrofolate reductase-thymidylate synthase gene from human and bovine isolates of Cryptosporidium parvum.

Abstract excerpt

We have determined the nucleic acid sequences of a gene encoding the bifunctional enzyme dihydrofolate reductase-thymidylate synthase (DHFR-TS) from bovine and human AIDS isolates of Cryptosporidium parvum. THe DHFR-TS gene was isolated from genomic DNA libraries by hybridization with a probe amplified from C. parvum genomic DNA using generic TS primers in the polymerase chain reaction. Genomic Southern and...

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