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Localization and intron usage analysis of the human CPT1B gene for muscle type carnitine palmitoyltransferase I.

We isolated and sequenced cDNA and genomic DNA fragments of the human CPT1B gene, encoding muscle type camitine palmitoyltransferase I. A recombinant P1 phage containing CPT1B was mapped to chromosome 22qter by fluorescent in situ hybridization. This finding supports the concept that 'liver type' and 'muscle type' isoforms of CPT I are encoded by different loci at separate chromosomal positions. Analysis of CPT1B cDNA sequences revealed the presence of an untranslated 5' exon and differential processing of introns 13 and 19. The alternative splicing of intron 13 causes an in-frame deletion leading to a 10 amino acid residues smaller protein. Using different splice acceptor sites, intron 19 is spliced in the majority of cases, but 4 out of 14 sequenced CPT1B 3' cDNA clones contain part of intron 19 in stead of exon 20. We found that differential polyadenylation is the mechanism behind the existence of these alternative 3' CPT1B mRNA forms.[1]

References

  1. Localization and intron usage analysis of the human CPT1B gene for muscle type carnitine palmitoyltransferase I. van der Leij, F.R., Takens, J., van der Veen, A.Y., Terpstra, P., Kuipers, J.R. Biochim. Biophys. Acta (1997) [Pubmed]
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