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    Cell. 1980 Feb;19(2):355-64.

    Structure and genomic organization of the mouse dihydrofolate reductase gene.

    Nunberg JH, Kaufman RJ, Chang AC, Cohen SN, Schimke RT.

    The genomic organization of the mouse dihydrofolate reductase gene has been determined by hybridization of specific cDNA sequences to restriction endonuclease-generated fragments of DNA from methotrexate-resistant S-180 cells. The dihydrofolate reductase gene contains a minimum of five intervening sequences (one in the 5' untranslated region and four in the protein-coding region) and spans a minimum of 42 kilobase pairs on the genome. Genomic sequences at the junction of the intervening sequence and mRNA-coding sequence and at the polyadenylation site have been determined. A similar organization is found in independently isolated methotrexate-resistant cell lines, in the parental sensitive cell line and in several inbred mouse strains, indicating that this organization represents that of the natural gene.

    PMID: 6244105 [PubMed - indexed for MEDLINE]

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