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. 1986 Jul;83(14):4993–4997. doi: 10.1073/pnas.83.14.4993

Molecular cloning of an oncogene from a human hepatocellular carcinoma.

T Ochiya, A Fujiyama, S Fukushige, I Hatada, K Matsubara
PMCID: PMC323875  PMID: 3014525

Abstract

A transforming DNA, named lca (for liver cancer), was obtained from a primary human hepatocellular carcinoma (HCC) in transformation assays using NIH 3T3 cells and a calcium phosphate coprecipitation method. High molecular weight DNA obtained from the HCC tissue was employed for this purpose. This transforming DNA had a linkage to the Alu sequence and was cloned in lambda phage for further studies. Restriction enzyme analyses showed that the minimal size of the lca transforming DNA is about 10 kilobase pairs and that its cleavage profiles are different from those of any one of the previously reported human transforming genes or retroviral oncogenes. No cross-hybridization was observed between these genes and the lca DNA. Southern blot analyses of DNAs from flow-sorted human chromosomes and human-mouse somatic cell hybrids indicated that the lca DNA is located on human chromosome 2. An independently obtained transforming DNA from another HCC exhibited identical restriction enzyme cleavage profiles. Thus, lca DNA is likely to represent a commonly encountered transforming DNA in HCC.

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