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Mechanism and function of CEACAM1 splice isoforms.

Kenneth J Dery1, Sonia M Najjar2, Nicole Beauchemin3

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European Journal of Clinical Investigation
|December 15, 2024
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Alternative splicing of carcinoembryonic antigen-related cell adhesion molecule 1 (CEACAM1) generates isoforms with distinct functions. Targeting aberrant CEACAM1 splicing with antisense molecules offers potential therapeutic strategies.

Keywords:
CEACAM1alternative splicingexonsinflammationischemia‐reperfusion injuryphosphorodiamidate morpholinos

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Immunology

Background:

  • Alternative splicing is crucial for post-transcriptional gene regulation.
  • CEACAM1, a transmembrane glycoprotein, exhibits extensive alternative splicing, yielding isoforms with varied functions in cell signaling, adhesion, and immune/metabolic responses.
  • CEACAM1 splice isoforms, differing in ectodomain and cytoplasmic tails (CEACAM1-S/CEACAM1-L), possess distinct roles, yet splicing regulation mechanisms remain unclear.

Purpose of the Study:

  • To review the mechanisms and functions of CEACAM1 splice isoforms.
  • To explore the biological significance of CEACAM1 glycosylation, exon 7 splicing, and phosphorylation in signal transduction.
  • To discuss the therapeutic potential of targeting mis-spliced CEACAM1 variants.

Main Methods:

  • Narrative review of existing literature on CEACAM1 alternative splicing.
  • Analysis of historical data on CEACAM1 structure-function relationships.
  • Discussion of antisense oligonucleotide strategies for CEACAM1 exon 7 modulation.

Main Results:

  • The CEACAM1 N-domain mediates cell adhesion and immune checkpoint inhibition.
  • Specific residues in the transmembrane domain are critical for CEACAM1 dimerization.
  • CEACAM1-S interacts with calmodulin, CamK2D, Actin, and Annexin A2; HIF-1-α induces CEACAM1-S under hypoxia.
  • Antisense molecules targeting exon 7 show promise for correcting CEACAM1 splicing defects.

Conclusions:

  • Further pre-clinical and clinical research is essential.
  • Understanding CEACAM1 RNA splicing mechanisms is key to developing targeted therapeutic interventions.
  • Exploiting CEACAM1 splicing offers novel avenues for therapeutic strategies.