Alternative splicing and nonsense-mediated mRNA decay in the regulation of a new adenomatous polyposis coli transcript

Marina De Rosa, Gemma Morelli, Elena Cesaro, Francesca Duraturo, Mimmo Turano, Giovanni B. Rossi, Paolo Delrio, Paola Izzo

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Familial adenomatous polyposis (FAP) is a rare precancerous condition caused by mutations in the adenomatous polyposis coli (apc) gene. Alternative splicing mechanisms involving non-coding and coding exons result in multiple protein variants whose molecular weight ranges between 90 and 300 kDa. We examined the apc 5′ coding region and identified nine new transcripts generated from alternative and/or aberrant splicing. Three of these preserve the reading frame and the corresponding proteins include the catalytic domains and the sequences required for β-catenin regulation. The other six transcripts create a frameshift that produces a premature stop codon; one of these has an additional 77-nucleotide-long exon (1A) between exons 1 and 2 that leads to a frameshift and a premature stop codon in exon 2. Quantitative PCR analysis suggests that the expression of this transcript is regulated during colorectal cancer tumorigenesis and differentiation. Nonsense-mediated mRNA decay (NMD) is a eukaryotic mRNA surveillance mechanism that detects and degrades mRNAs that have premature termination codons (PTCs). Expression of splicing variants containing PTCs and their subsequent degradation via NMD seems to be a general mechanism of gene regulation. Incubation of Caco2 cell lines with cycloheximide, a chemical inhibitor of translation that is known to inhibit also NMD, indicates that the apc mRNA isoform that includes exon 1A is degraded by NMD, thereby suggesting that regulated unproductive splicing and NMD degradation could modulate APC protein expression.

Original languageEnglish
Pages (from-to)8-14
Number of pages7
JournalGene
Volume395
Issue number1-2
DOIs
Publication statusPublished - Jun 15 2007

Fingerprint

Nonsense Mediated mRNA Decay
Adenomatous Polyposis Coli
Alternative Splicing
Nonsense Codon
Exons
Precancerous Conditions
APC Genes
RNA Isoforms
Catenins
Reading Frames
Messenger RNA
Proteins
RNA Stability
Gene Expression Profiling
Cycloheximide
Colorectal Neoplasms
Catalytic Domain
Carcinogenesis
Nucleotides
Molecular Weight

Keywords

  • Colon differentiation
  • Colorectal cancer progression
  • Familial adenomatous polyposis
  • Splicing machinery

ASJC Scopus subject areas

  • Genetics

Cite this

Alternative splicing and nonsense-mediated mRNA decay in the regulation of a new adenomatous polyposis coli transcript. / De Rosa, Marina; Morelli, Gemma; Cesaro, Elena; Duraturo, Francesca; Turano, Mimmo; Rossi, Giovanni B.; Delrio, Paolo; Izzo, Paola.

In: Gene, Vol. 395, No. 1-2, 15.06.2007, p. 8-14.

Research output: Contribution to journalArticle

De Rosa, Marina ; Morelli, Gemma ; Cesaro, Elena ; Duraturo, Francesca ; Turano, Mimmo ; Rossi, Giovanni B. ; Delrio, Paolo ; Izzo, Paola. / Alternative splicing and nonsense-mediated mRNA decay in the regulation of a new adenomatous polyposis coli transcript. In: Gene. 2007 ; Vol. 395, No. 1-2. pp. 8-14.
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