Identification of novel initiation sites for human DNA replication around ARSH1, a previously characterized yeast replicator.

Abstract:

:Replication of mammalian chromosomes depends on the activation of a large number of origins of DNA replication distributed along the chromosomes. We have focused our attention on a human DNA region, named ARSH1, localized to chromosome 2, that had been previously shown to act as an episomal origin in the yeast Saccharomyces cerevisiae. In the present study we have used a nascent strand DNA abundance assay to map initiation sites for DNA replication in in vivo human chromosomes around a 5 kb region encompassing ARSH1. This analysis applied to a 1-1.4 kb nascent DNA strand fraction isolated from normal skin fibroblasts revealed the presence of two major initiations sites surrounding the ARSH1 region. With an equivalent DNA fraction obtained from HeLa cells, in addition to these sites, a broad initiation profile was observed which included the ARSH1 region. This DNA region however was not sufficient to support episomal replication of an ARSH1-containing plasmid transfected into HeLa cells.

authors

Hu L,Xu X,Valenzuela MS

doi

10.1016/j.bbrc.2003.12.040

subject

Has Abstract

pub_date

2004-01-23 00:00:00

pages

1058-64

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006291X03026329

journal_volume

313

pub_type

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