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. 1978 Jun;75(6):2679–2683. doi: 10.1073/pnas.75.6.2679

Inverted repeated DNA from Chinese hamster ovary cells studied with cloned DNA fragments.

W R Jelinek
PMCID: PMC392626  PMID: 275835

Abstract

Fragments from the DNA of Chinese hamster ovary cells produced by restriction endonuclease EcoRI were cloned in Charon 16A lambda bacteriophage and examined for the ability to hybridize in situ with 32P-labeled double-stranded regions from heterogeneous nuclear RNA (hnRNA). Of 235 clones tested, 87 (37%) contained sequences that hybridized with the double-stranded hnRNA. Nine of these were examined for the presence of inverted repeat DNA structures (ir-DNA) by electron microscopy. All nine contained at least two elements of ir-DNA. Analysis of heteroduplexes formed from the DNAs of the different clones as well as T1 fingerprint analysis of the double-stranded hnRNA hybridized to each of the nine clones suggest that there is detectable nucleotide sequence homology in the various ir-DNAs. There are ca 3 X 10(5) ir-DNA pairs in the haploid Chinese hamster ovary cell genome.

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Selected References

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