Linked Life Data

1394512

Source:http://linkedlifedata.com/resource/pubmed/id/1394512

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1992-11-9
pubmed:databankReference
pubmed:abstractText
We have examined five nuclear group I introns, located at three different positions in the large subunit ribosomal RNA (LSU rRNA) gene of the two myxomycete species, Didymium iridis and Physarum polycephalum. Structural models of intron RNAs, including secondary and tertiary interactions, are proposed. This analysis revealed that the Physarum intron 2 contains an unusual core region that lacks the P8 segment, as well as several of the base-triples known to be conserved among group I introns. Structural and evolutionary comparisons suggest that the corresponding introns 1 and 2 were present in a common ancestor of Didymium and Physarum, and that the five introns in LSU rRNA genes of these myxomycetes were acquired in three different events. Evolutionary relationships, inferred from the sequence analysis of several different nuclear group I introns and the ribosomal RNA genes of the intron-harbouring organisms, strongly support horizontal transfer of introns in the course of evolution. We propose a model that may explain how myxomycetes in natural environments obtained their nuclear group I introns.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0172-8083
pubmed:author
pubmed:issnType
Print
pubmed:volume
22
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
297-304
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1992
pubmed:articleTitle
Structure and evolution of myxomycete nuclear group I introns: a model for horizontal transfer by intron homing.
pubmed:affiliation
Institute of Medical Biology, University of Tromsø, Norway.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't