NOTCH2 Gene: Function, Mutations, and Associated Diseases

NOTCH2 encodes a member of the Notch family of transmembrane receptors, which play a critical role in cell-fate determination, differentiation, and proliferation. The protein is a heterodimer composed of an extracellular domain and an intracellular domain, which upon ligand binding undergoes proteolytic cleavage to release the intracellular domain (NICD) that translocates to the nucleus and regulates transcription. NOTCH2 is essential for embryonic development, particularly in the cardiovascular, skeletal, and immune systems. Mutations in NOTCH2 are associated with Alagille syndrome type 2 and Hajdu-Cheney syndrome, and aberrant signaling is implicated in various cancers.

Tissue Expression

Cell Line Expression

Hotspot Mutations

Mutation functional classification

• Notch signaling pathway (KEGG hsa04330)

• Signaling by NOTCH2 (Reactome R-HSA-1980145)

• Pre-NOTCH processing in Golgi (Reactome R-HSA-1912408)

• NOTCH2 intracellular domain regulates transcription (Reactome R-HSA-2197563)

NOTCH2 is a single-pass transmembrane receptor of 2471 amino acids (UniProt Q04721). It is synthesized as a precursor that is cleaved in the Golgi to form a heterodimer. The extracellular domain contains 36 EGF-like repeats and 3 LIN-12/Notch repeats, mediating ligand binding. The intracellular domain includes RAM domain, ankyrin repeats, and a C-terminal PEST domain. Upon ligand binding, sequential proteolytic cleavages by ADAM metalloproteases and gamma-secretase release NICD, which translocates to the nucleus and forms a transcriptional complex with RBPJ and MAML to activate target genes (e.g., HES, HEY).