The wild-type Schizosaccharomyces pombe mat1 imprint consists of two ribonucleotides.

Abstract:

:The imprint at the mat1 locus of Schizosaccharomyces pombe acts to initiate the replication-coupled recombination event that underlies mating-type switching. However, the nature of the imprint has been an area of dispute. Two alternative models have been proposed: one stated that the imprint is a nick in the DNA, whereas our data suggested that it consists of one or two ribonucleotides incorporated into the otherwise intact DNA duplex. Here, we verify key predictions of the RNA model by characterization of wild-type genomic DNA purified under conditions known to hydrolyse DNA-RNA-DNA hybrid strands. First, we observe one-nucleotide gap at the hydrolysed DNA, as expected from the presence of two ribonucleotides. Second, using a novel assay based on ligation-mediated PCR, a 3'-terminal ribonucleotide is detected at the hydrolysed imprint. Our observations allow the unification of available data sets characterizing the wild-type imprint.

journal_name

EMBO Rep

journal_title

EMBO reports

authors

Vengrova S,Dalgaard JZ

doi

10.1038/sj.embor.7400576

keywords:

subject

Has Abstract

pub_date

2006-01-01 00:00:00

pages

59-65

issue

1

eissn

1469-221X

issn

1469-3178

pii

7400576

journal_volume

7

pub_type

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