Linked Life Data

3652906

Source:http://linkedlifedata.com/resource/pubmed/id/3652906

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1987-11-5
pubmed:databankReference
pubmed:abstractText
We have characterized rat testis cDNAs encoding insulin-like growth factor I (IGF-I) precursor to facilitate studies of IGF-I expression in the male reproductive system. Two clones, P2 and P3, with inserts of 786 and 1200 bp, respectively, were isolated from a lambda gt11 library of rat testis cDNAs. The longest open reading frame of cDNA P2 predicts a 153-amino-acid residue IGF-I precursor that has only 11 amino acid substitutions compared with a human IGF-IA precursor encoded by a human liver mRNA. Three substitutions are within the predicted rat IGF-I sequence: a Pro for Asp in the B domain, an Ile for Ser in the C domain, and Thr for Ala in the D domain. Only two substitutions distinguish the predicted rat sequence from a mouse liver IGF-IA precursor: Thr for Ala in the signal peptide and Ala for Ser in the D domain. P2 hybridizes with poly(A)+ mRNAs of 7.5, 4.7, 1.7, and 1.2-0.9 kb in rat liver and testis. The other testis cDNA, P3, appears to represent a partially processed rat IGF-I mRNA precursor. By comparing the sequence of cDNA P2 with that of cDNA P3 and a 2.3-kb rat IGF-I genomic fragment, we predict exon splice sites within the codon for residue 26 and between residues 86-87 of the rat IGF-I precursor. Both of the predicted splice sites align with exon-intron junctions in the human IGF-I gene. We conclude, therefore, that IGF-I is synthesized as a precursor in the rat testis and that the structure of IGF-I genes, mRNAs, and precursors are highly conserved across species.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0198-0238
pubmed:author
pubmed:issnType
Print
pubmed:volume
6
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
325-30
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1987
pubmed:articleTitle
Isolation of rat testis cDNAs encoding an insulin-like growth factor I precursor.
pubmed:affiliation
Department of Pediatrics, School of Medicine, University of North Carolina at Chapel Hill 27514.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S.