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Transfection of mouse cells with thymidine kinase gene of herpes simplex virus

✍ Scribed by Chee Gun Lee; Chan Gil Kim; Rock Namkung; Sang Eun Lee; Sang Dai Park

Publisher
Springer
Year
1990
Tongue
English
Weight
608 KB
Volume
3
Category
Article
ISSN
0920-9069

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✦ Synopsis

A mouse cell line (LP1-1) was established from the murine L cells deficient in thymidine kinase (L-M(TK-] by prolonged selective culture on the hypoxanthine-aminopterine-thymidine (HAT) medium following transfection with the thymidine kinase gene of herpes simplex virus type-I (HSVTK). Southern blot analysis has shown that the viral TK gene was integrated into one of the chromosomal loci by a single copy. From this established cell line, the 5-bromo-2-deoxyuridine (BrdU) resistant revertant was brought out at a frequency of 1 x 10(-6) and from these BrdU resistant revertants (LP1BU), one out of 1 x 10(5) cells could return to the HAT-resistant phenotype. The established LP1-1 cell line showed a typical biphasic nature of DNA synthesis as determined by the 3H-thymidine incorporation test. The activity of thymidine kinase was shown to be equivalent to that of the DNA polymerase-alpha when the whole nuclear fraction or the nuclear matrix were used for examination. These results indicate that the transfected viral TK gene can be expressed under the normal cell-cycle regulation and its gene product can act as a component of the multienzyme complex which is responsible for DNA replication.

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