Amplified inverted duplications within and adjacent to heterologous selectable DNA.

Abstract:

:Plasmids containing a dihydrofolate reductase (DHFR) expression unit were transfected into DHFR-deficient Chinese hamster ovary (CHO) cells. Methotrexate exposure was used to select cells with amplified DHFR sequences. Three cell lines were isolated containing amplified copies of transfected DNA that had integrated into the Chinese hamster genome. Plasmid DNA was found to co-amplify with flanking hamster sequences that were repetitive (2 cell lines) and unique (1 cell line). Fragments comprising the junctions of amplified plasmid and CHO DNA were found to exist as inverted duplications in all three cell lines. These observations provide evidence that inverted duplication occurred prior to DNA amplification, thus underscoring the importance of inverted duplication in the DNA amplification process.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Heartlein MW,Latt SA

doi

10.1093/nar/17.4.1697

subject

Has Abstract

pub_date

1989-02-25 00:00:00

pages

1697-716

issue

4

eissn

0305-1048

issn

1362-4962

journal_volume

17

pub_type

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