Delta-like 1 (DLL1) is a transmembrane ligand for Notch receptors. It plays critical roles in neurogenesis, synaptic plasticity, and has been implicated in neurodegenerative processes.
DLL1 (Delta-Like 1) is a Notch ligand that activates Notch signaling pathway. DLL1 is a transmembrane protein involved in cell fate determination, boundary formation, and synaptic plasticity. In the nervous system, DLL1-Notch signaling regulates neurogenesis, gliogenesis, and synapse formation. Dysregulated DLL1 signaling is implicated in neurodevelopmental disorders and may contribute to neurodegeneration.
DLL1 is a type I transmembrane protein:
- Extracellular domain: Multiple EGF-like repeats (8) and DSL domain
- Notch-binding DSL domain: Essential for Notch interaction
- Transmembrane domain: Single-pass membrane anchor
- Intracellular domain: Short cytoplasmic tail (signal-independent)
Functions as both membrane-bound and proteolytically cleaved (soluble) form.
DLL1 is a canonical Notch ligand:
- Neurogenesis: Maintains neural stem cells, promotes differentiation
- Synaptic plasticity: Regulates dendritic spine formation and function
- Myelination: Controls oligodendrocyte differentiation
- Axonal guidance: Mediates lateral inhibition in neurogenesis
DLL1-Notch signaling is essential for maintaining the balance between neural stem cell proliferation and differentiation.
- Altered DLL1 expression in AD brains
- Impacts amyloid-β effects on neural progenitor cells
- May contribute to adult neurogenesis impairment
- Notch-DLL1 in synaptic dysfunction
- Expressed in dopaminergic neurons
- May influence dopaminergic neurogenesis
- Implicated in α-synuclein toxicity
- Critical for oligodendrocyte precursor differentiation
- Impaired remyelination involves DLL1 dysregulation
- Therapeutic potential for promoting repair
- Involved in post-stroke neurogenesis
- May enhance neural repair
DLL1 modulation strategies:
- DLL1 agonists: Promote Notch signaling for repair
- Notch inhibitors: May enhance neurogenesis (trade-off with side effects)
- Gamma-secretase inhibitors: Block Notch activation