title: Differential expression of S1 and elongation factor-1 alpha during rat development.
abstract: Elongation factor-1 alpha (EF-1 alpha) is a highly conserved protein functioning in peptide elongation during translation. A cDNA, S1, was isolated; its deduced amino acid sequence shares high similarity with mammalian EF-1 alpha s (92%). While EF-1 alpha is present in all tissues, S1 mRNA can only be detected in brain, heart, and muscle. We report here that the retropseudogene phenomenon is attributable to EF-1 alpha and not S1, the latter being represented by a single copy in the rat genome. The S1 steady-state mRNA levels are consistently higher than EF-1 alpha in S1-positive tissues. S1 mRNA can only be detected late during brain, heart, and muscle development in vivo and increases to a plateau in early postnatal life. In a cultured muscle system, S1 expression is dependent upon the formation of myotubes, although the accumulation of S1 mRNA is significantly lower than that observed in adult skeletal muscle. EF-1 alpha mRNA levels are down-regulated during brain, heart, and muscle development, but stay relatively steady in liver. We show here that EF-1 alpha and S1 are differentially expressed during rat development and that the activation of S1 gene expression is subsequent to the terminal differentiation process in brain, heart, and muscle.
authors.affiliation: Bloomfield Center for Research in Aging, Lady Davis Institute for Medical Research, Sir Mortimer B. Davis-Jewish General Hospital, Montreal, Quebec, Canada.
authors.forename: S
authors.initials: S
authors.lastname: Lee
authors.forename: L A
authors.initials: LA
authors.lastname: Wolfraim
authors.forename: E
authors.initials: E
authors.lastname: Wang
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002478:Cells, Cultured; D018076:DNA, Complementary; D005314:Embryonic and Fetal Development / Q000235:genetics; D005260:Female; D005786:Gene Expression Regulation; D008969:Molecular Sequence Data; D009132:Muscles / Q000166:cytology / Q000196:embryology / Q000378:metabolism; D020648:Peptide Elongation Factor 1; D010445:Peptide Elongation Factors / Q000235:genetics*; D011247:Pregnancy; D012333:RNA, Messenger / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D017208:Rats, Wistar; D017386:Sequence Homology, Amino Acid; D013045:Species Specificity
chemical_list: D018076:DNA, Complementary; D020648:Peptide Elongation Factor 1; D010445:Peptide Elongation Factors; D012333:RNA, Messenger