Linked Life Data

7668389

Source:http://linkedlifedata.com/resource/pubmed/id/7668389

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1995-10-11
pubmed:abstractText
Yeast Saccharomyces cerevisiae is an excellent model to study eukaryotic DNA replication. Since yeast lacks thymidine kinase, it is difficult to assay DNA synthesis. In this report, a novel approach called the pulsed field gel electrophoresis (PFGE) labeling method is used to investigate yeast chromosomal DNA synthesis. In this method, yeast cells are first labeled by 32P in vivo and chromosomal DNA molecules are then resolved by pulsed field gel electrophoresis. A linear 32P labeling of chromosomal-size DNA molecules can be observed up to 100 min in an asynchronized culture. In an alpha-factor arresting-and-releasing synchronized culture, we observed that 32P can be rapidly taken up in the S phase. Our results show that all of the chromosomes are labeled at approximately the same time (within a 15-min interval), suggesting that the temporal order of all chromosomal DNA synthesis is synchronized in the S phase. Cell cycle blockers were used to arrest the yeast cultures to study DNA synthesis that coincides with cell cycle analysis. Our results show that alpha-factor and hydroxyurea block the cell cycle at the late G1 and S phases, respectively, resulting in the failure of DNA synthesis. Nocodazole blocks the cell cycle after the S phase and thus shows no effect on chromosomal DNA synthesis. Since the PFGE labeling method is highly specific to chromosomal DNA synthesis, we used it to examine the DNA synthesis pattern in various cell cycle mutants. All of the G1/S cdc mutants tested, cdc4, 6, 7, 8, 17, 2, and 9, cannot label the chromosomal size of DNA molecules; but the G2/M cdc mutant cdc13 can.(ABSTRACT TRUNCATED AT 250 WORDS)
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0003-2697
pubmed:author
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
227
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
32-9
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1995
pubmed:articleTitle
Pulsed field gel electrophoresis labeling method to study the pattern of Saccharomyces cerevisiae chromosomal DNA synthesis during the G1/S phase of the cell cycle.
pubmed:affiliation
Department of Pediatrics and Microbiology, University of Southern California School of Medicine, Los Angeles 90033, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't