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1981 ; 27
(1 Pt 2
): 223-31
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Somatic expression of herpes thymidine kinase in mice following injection of a
fusion gene into eggs
#MMPMID6276022
Brinster RL
; Chen HY
; Trumbauer M
; Senear AW
; Warren R
; Palmiter RD
Cell
1981[Nov]; 27
(1 Pt 2
): 223-31
PMID6276022
show ga
A plasmid, designated pMK, containing the structural gene for thymidine kinase
from herpes simplex virus (HSV) fused to the promoter/regulatory region of the
mouse metallothionein-I gene, was injected into the pronucleus of fertilized
one-cell mouse eggs; the eggs were subsequently reimplanted into the oviducts of
pseudopregnant mice. The first experiment produced 19 offspring, one of which
expressed high levels of HSV thymidine kinase activity in the liver and kidney.
pMK DNA sequences were detected in equal amounts in several tissues of the
expressing mouse as well as in three mice that did not express HSV thymidine
kinase activity. In all cases, several copies of the pMK plasmid were tandemly
duplicated and integrated into mouse DNA. It appears as though multiple copies of
the intact plasmid were fused by homologous recombination either before or after
integration at a single site in the mouse genome. The overall efficiency of
obtaining somatic expression of thymidine kinase in experiments performed to date
is about 10% (4/41), and twice this number have integrated pMK DNA. This
procedure not only provides a means of introducing new genes into mice, but it
will also be a valuable system for studying tissue-specific regulation of gene
expression.