Linked Life Data

12928394

Source:http://linkedlifedata.com/resource/pubmed/id/12928394

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
2003-8-20
pubmed:databankReference
pubmed:abstractText
To clarify the evolutionary origin of the linkage of the MHC class III complement genes with the MHC class I and II genes, we isolated C4 cDNA from the banded hound shark (Triakis scyllium). Upon phylogenetic tree analysis, shark C4 formed a well-supported cluster with C4 of higher vertebrates, indicating that the C3/C4 gene duplication predated the divergence of cartilaginous fish from the main line of vertebrate evolution. The deduced amino acid sequence predicted the typical C4 three-subunits chain structure, but without the histidine residue catalytic for the thioester bond, suggesting the human C4A-like specificity. The linkage analysis of the complement genes, one C4 and two factor B (Bf) genes, to the shark MHC was performed using 56 siblings from two typing panels of T. scyllium and Ginglymostoma cirratum. The C4 and one of two Bf genes showed a perfect cosegregation with the class I and II genes, whereas two recombinants were identified for the other Bf gene. These results indicate that the linkage between the complement C4 and Bf genes, as well as the linkage between these complement genes and the MHC class I and II genes were established before the emergence of cartilaginous fish >460 million years ago.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
AIM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
0022-1767
pubmed:author
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
171
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
2461-6
pubmed:dateRevised
2010-11-18
pubmed:meshHeading
pubmed:year
2003
pubmed:articleTitle
Molecular cloning of C4 gene and identification of the class III complement region in the shark MHC.
pubmed:affiliation
Department of Experimental Radiology, Shiga University of Medical Science, Ohtsu-shi, Shiga, Japan.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't