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Journal of Lipid Research, Vol 34, 1367-1383, Copyright © 1993 by Lipid Research, Inc.
ARTICLES |
J Greeve, I Altkemper, JH Dieterich, H Greten and E Windler
Medizinische Kernklinik und Poliklinik, Universitats-Krankenhaus Eppendorf, Hamburg, Germany.
Two different isoproteins are encoded by the apolipoprotein (apo) B gene, apoB-48 and apoB-100. ApoB-48, core component of intestinally derived chylomicrons, has an accelerated plasma turnover as compared with the full-length protein apoB-100. A posttranscriptional modification of the apoB mRNA by conversion of cytidine into uridine at nucleotide position 6666 changes the genomically encoded glutamine codon CAA at amino acid residue 2153 into a translational stop codon UAA. This mRNA editing explains the formation of the truncated isoform apoB-48. In the present investigation editing of apoB mRNA in liver and intestine from 12 different mammalian species was measured by a quantitative primer extension analysis of reverse-transcribed and polymerase chain reaction- (PCR) amplified apoB mRNA in order to determine whether i) editing of apoB mRNA is generally restricted to the intestine or may also be found in the liver of other species than rodents, and ii) hepatic expression of apoB mRNA editing influences lipoprotein concentrations in plasma. Intestinal apoB mRNA was edited at high levels in all species, 40% in sheep, 73% in horse, 82% in pig, 84% in dog, 84% in cat, 87% in guinea pig, 88% in rat, 89% in mouse, and > 90% in human, monkey, cow, and rabbit. In liver apoB mRNA was edited to 18% in dog, to 43% in horse, to 62% in rat, and to 70% in mouse. Low levels of editing below 1% were detected in liver of rabbit and guinea pig. In contrast, hepatic apoB mRNA from human, monkey, pig, cow, sheep, and cat liver was not edited. The results of the primer extension analysis were confirmed by cloning and sequencing of the PCR products from dog, horse, cat, guinea pig, sheep, and cow for all of which the apoB cDNA sequence had not been established by previous investigations. Primer extension analysis of apoB mRNA from dog intestine and dog liver indicated C/U editing at C6655 in addition to C6666. Cloning and sequencing of apoB cDNA from dog liver and intestine confirmed additional C/U editing at C6655 which changes ACA for threonine at amino acid residue 2149 into AUA for isoleucine. Synthesis and secretion of apoB-48-containing lipoproteins from liver was demonstrated by pulse labeling of freshly isolated horse hepatocytes and immunoprecipitation with apoB-specific antibodies or density gradient ultracentrifugation. The concentrations of VLDL, LDL, and HDL in all species were determined after fractionation by density gradient ultracentrifugation.(ABSTRACT TRUNCATED AT 400 WORDS)
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