Linked Life Data

9645434

Source:http://linkedlifedata.com/resource/pubmed/id/9645434

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1998-7-20
pubmed:abstractText
A mutation in the RNA polymerase II largest subunit (RpII LS) that is related to abnormal induction of sister chromatid exchange has previously been described the CHO-K1 cell mutant tsTM4. To elucidate the molecular basis of this effect we introduced the mutation into the homologous site in the Schizosaccharomyces pombe rpbl gene, which encodes RpII LS. Since the tsTM4 mutant exhibited a decrease in the rate of DNA synthesis in cells arrested in S phase at the nonpermissive temperature, we focussed on the study of growth, the cell cycle, and chromosome stability at various temperatures. First, we examined the effects of the mutation on haploid yeast cells. The mutant showed slower growth than the wild type, but cell growth was not arrested at the nonpermissive temperature. When growing cells were shifted to the nonpermissive temperature, an accumulation of cells in G1 and/or G0 was observed. Tetrad analysis suggested that these phenotypes were associated with the mutation. In diploid cells, chromosome instability was detected by loss of intragenic complementation between two alleles of the ade6 gene. An abnormal fraction of cells containing an intermediate DNA content was also observed by FACS analysis. The accumulation of this fraction may reflect the fact that a large number of cells are in S phase or have an abnormal DNA content as a result of chromosome instability. These observations demonstrate that the S. pombe rpb1 mutant exhibits a phenotype very similar to that of the CHO-K1 cell mutant tsTM4.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0026-8925
pubmed:author
pubmed:issnType
Print
pubmed:volume
258
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
279-87
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1998
pubmed:articleTitle
Alteration of the largest subunit of RNA polymerase II and its effect on chromosome stability in Schizosaccharomyces pombe.
pubmed:affiliation
Genome Research Group, National Institute of Radiological Sciences, Chiba, Japan. k_sugaya@uexs72.nirs.go.jp
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't