# ORMDL3: from an asthma susceptibility gene to multi-disease associations

## TL;DR

ORMDL3, originally linked to asthma, is now known to influence multiple diseases by regulating lipid metabolism and immune responses.

## Contribution

This review expands ORMDL3's role from asthma to various diseases, highlighting its potential as a therapeutic target and biomarker.

## Key findings

- ORMDL3 regulates sphingolipid metabolism and affects inflammatory and immune responses.
- ORMDL3 is involved in obesity, diabetes, atherosclerosis, and several cancers.
- ORMDL3 influences ER stress, autophagy, and calcium signaling across multiple disease contexts.

## Abstract

The ORMDL3 protein, encoded by the ORMDL3 gene, functions as a transmembrane protein in the endoplasmic reticulum. Initially identified through its genetic link to asthma susceptibility, ORMDL3 plays a key role in regulating sphingolipid metabolism by inhibiting Serine Palmitoyltransferase activity. This regulation influences the synthesis of bioactive lipids like ceramides, which in turn affect cellular homeostasis, inflammatory responses, and immune regulation. Recent studies show that ORMDL3’s function extends beyond the respiratory system, with involvement in obesity, diabetes, atherosclerosis, inflammatory bowel disease, autoimmune diseases, and various cancers. It regulates processes such as endoplasmic reticulum stress, the unfolded protein response, autophagy, calcium signaling, and inflammatory pathways. This review highlights ORMDL3’s expression patterns, molecular mechanisms, and clinical relevance across different diseases, emphasizing its role as a biological node linking multiple pathologies. Additionally, it discusses ORMDL3’s potential as a target for innovative therapies and diagnostic biomarkers, laying the groundwork for future interdisciplinary research and precision medicine applications.