Koulintchenko, Milana, Vengrova, Sonya, Eydmann, Trevor, Arumugam, Prakash and Dalgaard, Jacob Z.. (2012) DNA polymerase α (swi7) and the flap endonuclease fen1 (rad2) act together in the s-phase alkylation damage response in S. pombe. PLoS One, Vol.7 (No.10). e47091. ISSN 1932-6203

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Abstract

Polymerase α is an essential enzyme mainly mediating Okazaki fragment synthesis during lagging strand replication. A specific point mutation in Schizosaccharomyces pombe polymerase α named swi7-1, abolishes imprinting required for mating-type switching. Here we investigate whether this mutation confers any genome-wide defects. We show that the swi7-1 mutation renders cells hypersensitive to the DNA damaging agents methyl methansulfonate (MMS), hydroxyurea (HU) and UV and incapacitates activation of the intra-S checkpoint in response to DNA damage. In addition we show that, in the swi7-1 background, cells are characterized by an elevated level of repair foci and recombination, indicative of increased genetic instability. Furthermore, we detect novel Swi1-, -Swi3- and Pol α- dependent alkylation damage repair intermediates with mobility on 2D-gel that suggests presence of single-stranded regions. Genetic interaction studies showed that the flap endonuclease Fen1 works in the same pathway as Pol α in terms of alkylation damage response. Fen1 was also required for formation of alkylation- damage specific repair intermediates. We propose a model to explain how Pol α, Swi1, Swi3 and Fen1 might act together to detect and repair alkylation damage during S-phase.

Item Type:	Journal Article
Subjects:	Q Science > QK Botany
Divisions:	Faculty of Medicine > Warwick Medical School > Biomedical Cell Biology Faculty of Science > Life Sciences (2010- )
Library of Congress Subject Headings (LCSH):	DNA polymerases, Schizosaccharomyces pombe -- Physiology, Mutation (Biology)
Journal or Publication Title:	PLoS One
Publisher:	Public Library of Science
ISSN:	1932-6203
Date:	2012
Volume:	Vol.7
Number:	No.10
Page Range:	e47091
Identification Number:	10.1371/journal.pone.0047091
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access
Funder:	Marie Curie Cancer Care
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URI:	http://wrap.warwick.ac.uk/id/eprint/52124

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