Linked Life Data

6213268

Source:http://linkedlifedata.com/resource/pubmed/id/6213268

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1982-10-21
pubmed:abstractText
Some progeny from a cross of the translocation mutant T(VL leads to IVL)AR33 with wild-type Neurospora crassa are double nucleolus organizer (DNO) strains, usually displaying two distinct nucleolus organizer regions. The DNO strain is sterile but displays the same growth response as normal laboratory strains of Neurospora. We used DNA-DNA hybridization techniques to quantify the number of rRNA cistrons in the DNO mutant and its vegetative progeny. Comparisons of the rate of hybridization of genomic DNA from the parental AR33 strain and from the DNO strain showed that hybridization was more rapid for the DNO strain than for the parental strain. Successive vegetative progeny of the DNO strain displayed hybridization rates intermediate to those of the original DNO strain and the parental single nucleolus strain, indicating that the number of rRNA cistrons had decreased during vegetative propagation. Estimates of rRNA cistron number obtained from comparisons of the amount of single copy DNA and rDNA hybridized to genomic DNO and AR33 DNA at saturation indicate that the parental AR33 strain contains 225 copies of the rRNA repeat unit while the DNO strain has approx. 440 copies. The number of rRNA cistrons decreases gradually in the successive vegetative progeny, approximating the parental haploid value by the eleventh vegetative transfer.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0006-3002
pubmed:author
pubmed:issnType
Print
pubmed:day
31
pubmed:volume
697
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
162-9
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1982
pubmed:articleTitle
Regulation of ribosomal RNA cistron number in a strain of Neurospora crassa with a duplication of the nucleolus organizer region.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, U.S. Gov't, Non-P.H.S.