Linked Life Data

9060395

Source:http://linkedlifedata.com/resource/pubmed/id/9060395

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1997-4-9
pubmed:databankReference
pubmed:abstractText
The origin and evolutionary relationship of actin isoforms was investigated in chordates by isolating and characterizing two new ascidian cytoplasmic and muscle actin genes. The exon-intron organization and sequences of these genes were compared with those of other invertebrate and vertebrate actin genes. The gene HrCA1 encodes a cytoplasmic (nonmuscle)-type actin, whereas the MocuMA2 gene encodes an adult muscle-type actin. Our analysis of these genes showed that intron positions are conserved among the deuterostome actin genes. This suggests that actin gene families evolved from a single actin gene in the ancestral deuterostome. Sequence comparisons and molecular phylogenetic analyses also suggested a close relationship between the ascidian and vertebrate actin isoforms. It was also found that there are two distinct lineages of muscle actin isoforms in ascidians: the larval muscle and adult body-wall isoforms. The four muscle isoforms in vertebrates show a closer relationship to each other than to the ascidian muscle isoforms. Similarly, the two cytoplasmic isoforms in vertebrates show a closer relationship to each other than to the ascidian and echinoderm cytoplasmic isoforms. In contrast, the two types of ascidian muscle actin diverge from each other. The close relationship between the ascidian larval muscle actin and the vertebrate muscle isoforms was supported by both neighbor-joining and maximum parsimony analyses. These results suggest that the chordate ancestor had at least two muscle actin isoforms and that the vertebrate actin isoforms evolved after the separation of the vertebrates and urochordates.
pubmed:grant
pubmed:commentsCorrections
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0022-2844
pubmed:author
pubmed:issnType
Print
pubmed:volume
44
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
289-98
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1997
pubmed:articleTitle
Evolution of chordate actin genes: evidence from genomic organization and amino acid sequences.
pubmed:affiliation
Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo, Japan. tgkusakabe@bio.hokudai.ac.jp
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't