Rat nicastrin gene: cDNA isolation, mRNA variants and expression pattern analysis

Annamaria Confaloni, Alessio Crestini, Diego Albani, Paola Piscopo, Lorenzo Malvezzi Campeggi, Liana Terreni, Marco Tartaglia, Gianluigi Forloni

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Nicastrin is a type 1 transmembrane glycoprotein that interacts with presenilin, Aph-1, and Pen-2 proteins to form a high molecular complex with gamma secretase activity. Then, nicastrin has a central role in presenilin-mediated processing of beta-amyloid precursor protein and in some aspects of Notch/glp-1 signaling in vivo. Here, we isolated a rat nicastrin cDNA and investigated gene expression in embryonic and adult rat tissues. The predicted amino acid sequence is comprised of 708 residues and showed a high degree of identity with other vertebrate orthologs. Besides full-length nicastrin mRNA, we identified an alternative spliced variant lacking the whole exon 3 and predicted to encode a 62-residue-long truncated protein. Full-length nicastrin mRNA was observed to be ubiquitously expressed, while the spliced variant was preferentially transcribed in the nervous system, whether in embryonic or adult neural tissues. Studies performed on primary cell cultures demonstrated that the short isoform was expressed in neurons, but not in astrocyte and microglial cells. Further experiments performed to verify the presence of the variant in neuroblastoma culture failed to show any truncated protein. Treatments by cyclohexamide showed the involvement of a quality control-based surveillance mechanism, which selectively degrades the exon 3-skipped isoform. In summary, this is the first report describing a novel skipped isoform of nicastrin which may suggest a new possible control mechanism based on the alternative splicing and nonsense-mediated mRNA decay to regulate brain protein expression and provide newer insights into potential implication in Alzheimer's disease.

Original languageEnglish
Pages (from-to)12-22
Number of pages11
JournalMolecular Brain Research
Volume136
Issue number1-2
DOIs
Publication statusPublished - May 20 2005

Fingerprint

Complementary DNA
Messenger RNA
Protein Isoforms
Genes
Exons
Proteins
Nonsense Mediated mRNA Decay
Presenilins
Presenilin-1
Amyloid Precursor Protein Secretases
Primary Cell Culture
Amyloid beta-Protein Precursor
Alternative Splicing
Neuroblastoma
Astrocytes
Quality Control
Nervous System
Vertebrates
Amino Acid Sequence
Glycoproteins

Keywords

  • Alternative splicing
  • Culture expression
  • Nicastrin
  • Nonsense-mediated mRNA decay
  • Rattus norvegicus
  • Tissue expression

ASJC Scopus subject areas

  • Molecular Biology
  • Cellular and Molecular Neuroscience

Cite this

Rat nicastrin gene : cDNA isolation, mRNA variants and expression pattern analysis. / Confaloni, Annamaria; Crestini, Alessio; Albani, Diego; Piscopo, Paola; Campeggi, Lorenzo Malvezzi; Terreni, Liana; Tartaglia, Marco; Forloni, Gianluigi.

In: Molecular Brain Research, Vol. 136, No. 1-2, 20.05.2005, p. 12-22.

Research output: Contribution to journalArticle

Confaloni, Annamaria ; Crestini, Alessio ; Albani, Diego ; Piscopo, Paola ; Campeggi, Lorenzo Malvezzi ; Terreni, Liana ; Tartaglia, Marco ; Forloni, Gianluigi. / Rat nicastrin gene : cDNA isolation, mRNA variants and expression pattern analysis. In: Molecular Brain Research. 2005 ; Vol. 136, No. 1-2. pp. 12-22.
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