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Functional analysis of Drosophila DNA polymerase ε p58 subunit. | LitMetric

Functional analysis of Drosophila DNA polymerase ε p58 subunit.

Am J Cancer Res

Department of Applied Biology, Kyoto Institute of Technology Sakyo-ku, Kyoto 606-8585, Japan ; Insect Biomedical Research Center, Kyoto Institute of Technology Sakyo-ku, Kyoto 606-8585, Japan.

Published: November 2013

AI Article Synopsis

Article Abstract

DNA polymerase ε (polε) plays a central role in DNA replication in eukaryotic cells, and has been suggested to the main synthetic polymerase on the leading strand. It is a hetero-tetrameric enzyme, comprising a large catalytic subunit (the A subunit ~250 kDa), a B subunit of ~60 kDa in most species (~80 kDa in budding yeast) and two smaller subunits (each ~20 kDa). In Drosophila, two subunits of polε (dpolε) have been identified. One is the 255 kDa catalytic subunit (dpolεp255), and the other is the 58 kDa subunit (dpolεp58). The functions of the B subunit have been mainly studied in budding yeast and mammalian cell culture, few studies have been performed in the context of an intact multicellular organism and therefore its functions in this context remain poorly understood. To address this we examined the in vivo role of dpolεp58 in Drosophila. A homozygous dpolεp58 mutant is pupal lethal, and the imaginal discs are less developed in the third instar larvae. In the eye discs of this mutant S phases, as measured by BrdU incorporation assays, were significantly reduced. In addition staining with an anti-phospho histone H3 (PH3) antibody, (a marker of M phase), was increased in the posterior region of eye discs, where usually cells stop replicating and start differentiation. These results indicate that dpolεp58 is essential for Drosophila development and plays an important role in progression of S phase in mitotic cell cycles. We also observed that the size of nuclei in salivary gland cells were decreased in dpolεp58 mutant, indicating that dpolεp58 also plays a role in endoreplication. Furthermore we detect a putative functional interaction between dpolε and ORC2 in discs suggesting that polε plays a role in the initiation of DNA replication in Drosophila.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3816967PMC

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