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. 1984 Jan;3(1):65–71. doi: 10.1002/j.1460-2075.1984.tb01762.x

Amplification and cloning of the Chinese hamster glutamine synthetase gene.

P G Sanders, R H Wilson
PMCID: PMC557298  PMID: 6142821

Abstract

A Chinese hamster ovary cell line, KG1MS which is resistant to 5 mM methionine sulphoximine overproduces glutamine synthetase. Overproduction of this 42 000 mol. wt. polypeptide is not seen in either parental KG1 or revertant KG1MSC4-0 cell lines which are resistant to 3 microM and 8 microM methionine sulphoximine, respectively. Restriction endonuclease analysis of DNA from KG1MS cells produces a pattern of amplified DNA fragments not seen in parental KG1 or revertant KG1MSC4-0 digests. Hybridization of cDNA probes complementary to KG1MS poly(A) mRNA against Southern blots of KG1MS restriction digests identifies a specific subset within these amplified sequences which is not detected by cDNA probes made from parental KG1 poly(A) mRNA. One 8.2-kb BglII fragment of KG1MS DNA identified by cDNA hybridization has been cloned to produce recombinant pGS-1. mRNA hybrid selected by pGS-1 translates to a 42 000 mol. wt. polypeptide which co-migrates in polyacrylamide gels with the over-produced protein in KG1MS cells and purified glutamine synthetase. pGS-1 also hybridizes to several mRNA species abundant in KG1MSC4-M, but not KG1, poly(A) mRNA extracts. The high level of resistance to methionine sulphoximine shown by KG1MS cells is due to amplification of a DNA sequence of at least 50 kb which contains the coding region for the enzyme glutamine synthetase.

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