Evidence of finely tuned expression of DNA polymerase beta in vivo using transgenic mice.
DNA polymerase (Pol) is an error-prone repair DNA polymerase that has been shown to create genetic instability and tumorigenesis when overexpressed by only 2-fold in cells, suggesting that a rigorous regulation of its expression may be essential in vivo. To address this question, we have generated mice which express a transgene (Tg) bearing the Pol cDNA under the control of the ubiquitous promoter of the mouse H-2K gene from the major histocompatibility complex. These mice express the Tg only in thymus, an organ which normally contains the most abundant endogenous Pol mRNA and protein, supporting the idea of a tight regulation of Pol in vivo. Furthermore, we found no tumor incidence, suggesting that the single Pol overexpression event is not sufficient to initiate tumorigenesis in vivo.
Bergoglio
Valérie
V
Equipe labellisée La ligue Nationale contre le cancer 2001 - Instabilité Génétique et Cancer, France.
Fréchet
Mathilde
M
Philippe
Magali
M
Bieth
Anne
A
Mercier
Pascale
P
Morello
Dominique
D
Lacroix-Tricki
Magali
M
Delsol
Georges
G
Hoffmann
Jean-Sébastien
JS
Cazaux
Christophe
C
D000818:Animals; D000831:Animals, Newborn; D015152:Blotting, Northern; D003587:Cytomegalovirus / Q000235:genetics; D019951:DNA Polymerase beta / Q000096:biosynthesis* / Q000235:genetics; D015870:Gene Expression; D005822:Genetic Vectors; D006183:H-2 Antigens / Q000235:genetics; D015151:Immunoblotting; D051379:Mice; D008810:Mice, Inbred C57BL; D008808:Mice, Inbred CBA; D008822:Mice, Transgenic; D012333:RNA, Messenger / Q000096:biosynthesis; D051381:Rats; D013950:Thymus Gland / Q000378:metabolism; D014018:Tissue Distribution; D019076:Transgenes
D006183:H-2 Antigens; D012333:RNA, Messenger; D019951:DNA Polymerase beta