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Alternative splicing generates a family of putative secreted and membrane-associated MUC4 mucins

N Moniaux1, F Escande, S K Batra

  • 1Unité 377 INSERM, Lille, France.

European Journal of Biochemistry
|July 6, 2000
PubMed

Insights

The MUC4 mucin gene produces diverse protein variants through alternative splicing. These forms include secreted, membrane-bound, and tandem repeat-lacking mucins, potentially impacting epithelial integrity.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • The MUC4 mucin gene encodes a large, membrane-anchored mucin composed of MUC4alpha and MUC4beta subunits.
  • Previous studies established the basic structure of the MUC4 gene and its protein product.

Purpose of the Study:

  • To identify and characterize novel MUC4 cDNA sequences generated by alternative splicing.
  • To determine the structural diversity of MUC4 protein isoforms.

Main Methods:

  • Cloning of unique MUC4 cDNA sequences.
  • Analysis of alternative splicing events within the MUC4 gene.
  • Deduction of protein sequences from novel cDNA variants.

Main Results:

  • Eight alternative splice events downstream of the tandem repeat array yielded seven new MUC4 variants (sv1-MUC4 to sv8-MUC4).
  • These variants included five secreted and two membrane-associated forms.
  • Two additional splicing events flanking the tandem repeat array generated MUC4/Y and MUC4/X, lacking the central tandem repeat.

Conclusions:

  • The MUC4 gene exhibits extensive alternative splicing, producing at least three distinct protein forms: membrane-bound, secreted, and tandem repeat-lacking.
  • These diverse MUC4 protein variants may play a role in maintaining epithelial integrity and renewal.

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