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Alternative splicing of a previously unidentified CFTR exon introduces an in-frame stop codon 5' of the R region

C A Melo1, C Serra, V Stoyanova

  • 1International Centre for Genetic Engineering and Biotechnology, Trieste, Italy.

FEBS Letters
|August 23, 1993
PubMed

Insights

Researchers discovered a novel alternatively spliced exon (10b) in cystic fibrosis transmembrane conductance regulator (CFTR) mRNA. This exon introduces a stop codon, leading to a truncated CFTR protein with potentially different functions.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • The cystic fibrosis transmembrane conductance regulator (CFTR) protein is central to cystic fibrosis pathogenesis.
  • CFTR variants arise from alternative splicing and RNA editing of its gene.
  • Understanding CFTR mRNA processing is crucial for deciphering disease mechanisms.

Purpose of the Study:

  • To investigate alternative splicing events in CFTR mRNA.
  • To identify novel CFTR isoforms and their functional implications.
  • To characterize the impact of alternative splicing on CFTR protein production.

Main Methods:

  • Analysis of CFTR mRNA in T84 cells, focusing on exons 10-11.
  • Detection and characterization of alternatively spliced exons using molecular techniques.
  • Immunoprecipitation using CFTR-specific antibodies to identify translated proteins.

Main Results:

  • An alternatively spliced exon, designated 10b, was identified in approximately 5% of CFTR mRNA.
  • Exon 10b is conserved in both human and mouse genomes.
  • Exon 10b insertion results in an in-frame stop codon, producing a truncated CFTR protein.

Conclusions:

  • A novel mechanism of CFTR protein regulation via alternative splicing has been identified.
  • The alternatively spliced exon 10b generates a truncated CFTR variant with potentially distinct properties.
  • This finding expands our understanding of CFTR diversity and its role in cellular function.

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