Welcome! Click here to login or here to register.
 |
|||||||||||||||||||
|
|||||||||||||||||||
 |
|||||||||||||||||||
"DNA polymerase delta is required for early mammalian embryogenesis." |
Uchimura A, Hidaka Y, Hirabayashi T, Hirabayashi M, Yagi T |
Published Jan. 1, 2009 in PLoS One volume 4 .
Pubmed ID: 19145245
Abstract:
| BACKGROUND: In eukaryotic cells, DNA polymerase delta (Poldelta), whose catalytic subunit p125 is encoded in the Pold1 gene, plays a central role in chromosomal DNA replication, repair, and recombination. However, the physiological role of the Poldelta in mammalian development has not been thoroughly investigated. METHODOLOGY/PRINCIPAL FINDINGS: To examine this role, we used a gene targeting strategy to generate two kinds of Pold1 mutant mice: Poldelta-null (Pold1(-/-)) mice and D400A exchanged Poldelta (Pold1(exo/exo)) mice. The D400A exchange caused deficient 3'-5' exonuclease activity in the Poldelta protein. In Poldelta-null mice, heterozygous mice developed normally despite a reduction in Pold1 protein quantity. In contrast, homozygous Pold1(-/-) mice suffered from peri-implantation lethality. Although Pold1(-/-) blastocysts appeared normal, their in vitro culture showed defects in outgrowth proliferation and DNA synthesis and frequent spontaneous apoptosis, indicating Poldelta participates in DNA replication during mouse embryogenesis. In Pold1(exo/exo) mice, although heterozygous Pold1(exo/+) mice were normal and healthy, Pold1(exo/exo) and Pold1(exo/-) mice suffered from tumorigenesis. CONCLUSIONS: These results clearly demonstrate that DNA polymerase delta is essential for mammalian early embryogenesis and that the 3'-5' exonuclease activity of DNA polymerase delta is dispensable for normal development but necessary to suppress tumorigenesis. |
This publication refers to following REPAIRtoire entries:
| Genes |
Last modification of this entry: Oct. 6, 2010
Add your own comment!
There is no comment yet.
|
|
|
|