Claudin-2 (CLDN2) mRNA (CLDN2 mRNA)

Claudin-2 is a pore-forming tight junction protein that facilitates the paracellular movement of water and small cations, primarily sodium, across epithelial layers (UniProt P57730). While it is essential for normal physiological processes in the kidney and intestinal crypts, its pathologically high expression in the intestinal villi is a hallmark of Inflammatory Bowel Disease (IBD), including Ulcerative Colitis and Crohn's disease (PubMed: 28453519). This overexpression leads to increased intestinal permeability, often referred to as 'leaky gut,' which exacerbates inflammation and causes diarrhea (PubMed: 31433954). Targeting the Claudin-2 mRNA allows for the downregulation of this protein at the pre-translational level, offering a novel approach to restoring intestinal barrier integrity. Current therapeutic candidates, such as the antisense oligonucleotide ION-829, are designed to bind specifically to the CLDN2 transcript and trigger its degradation (Ionis Pharmaceuticals, 2023). However, because Claudin-2 also plays a role in renal ion reabsorption in the proximal tubule, safety monitoring for electrolyte disturbances is a critical component of clinical development (PubMed: 24737868). By reducing the abundance of Claudin-2 protein, these therapies aim to decrease the paracellular leak of ions and water into the intestinal lumen, thereby alleviating symptoms and promoting mucosal healing.

Other names

CLDN2 mRNAClaudin-2 transcriptMessenger RNA encoding Claudin-2

Antisense oligonucleotide-mediated degradation of mRNA via RNase H, leading to reduced translation of the Claudin-2 protein.