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Tissue-specific alternative splicing of the beta-galactoside alpha-2,6-sialyltransferase gene

Academic Article
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Overview

authors

  • Wen, D. X.
  • Svensson, E. C.
  • Paulson, James

publication date

  • 1992

journal

  • Journal of Biological Chemistry  Journal

abstract

  • The rat alpha 2,6-sialyltransferase gene produces three different sized mRNAs (4.7, 4.3, and 3.6 kilobases (kb)) which exhibit striking tissue-specific expression. Recently, we characterized the cDNA and genomic organization of the 4.3-kb mRNA which is unique to rat liver. In this report cDNAs of the 4.7-kb mRNA found in most tissues and the 3.6-kb mRNA(s) unique to kidney have been cloned and characterized as well as the corresponding genomic sequences which differed from those of the previously characterized 4.3-kb mRNA. The 4.7-kb mRNA was found to be identical to the 4.3-kb mRNA with the exception of two additional exons at the 5'-untranslated end of the transcript. The constitutively expressed 4.7-kb mRNA therefore codes for the same sialyltransferase as the liver-restricted 4.3-kb mRNA. The additional 5'-exons of the 4.7-kb mRNA are located at least 15-40 kb upstream of the promoter responsible for the production of the 4.3-kb liver message. The 3.6-kb mRNA of rat kidney was found to be comprised of three transcripts of similar size. They were only expressed in kidney and were found to be generated from the alpha 2,6-sialyltransferase gene by alternative splicing and alternative promoter utilization. The results reveal the complexity of the alpha 2,6-sialyltransferase gene which produces at least five transcripts via alternative splicing in a tissue-specific fashion.

subject areas

  • Amino Acid Sequence
  • Animals
  • Base Sequence
  • Blotting, Northern
  • DNA
  • Kidney
  • Liver
  • Molecular Sequence Data
  • Promoter Regions, Genetic
  • RNA Splicing
  • RNA, Messenger
  • Rats
  • Restriction Mapping
  • Sequence Homology, Nucleic Acid
  • Sialyltransferases
  • Transcription, Genetic
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Identity

International Standard Serial Number (ISSN)

  • 0021-9258

PubMed ID

  • 1733948
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Additional Document Info

start page

  • 2512

end page

  • 2518

volume

  • 267

issue

  • 4

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