Reelin Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Reelin is a large extracellular matrix protein that plays critical roles in neuronal migration, cortical layer formation, and synaptic plasticity during brain development and in the adult brain. Reelin signaling through ApoE receptors modulates dendritic spine morphology and synaptic function. Reelin dysfunction is implicated in Alzheimer's disease and neuropsychiatric disorders.
This protein is involved in:
- Neuronal migration: Essential for cortical layer formation
- Synaptic plasticity: Regulates spine density and function
- Dendritic development: Controls dendritic arborization
- Disease associations: Alzheimer's disease, autism, schizophrenia, lissencephaly
Reelin is a large extracellular glycoprotein that plays essential roles in neuronal migration, synaptic plasticity, and cognitive function. It is a key regulator of brain development and is critically involved in the pathogenesis of Alzheimer's Disease and neuropsychiatric disorders.
¶ Gene and Protein Overview
- Gene Symbol: RELN
- Gene ID: 5649
- Chromosome: 7q22.1
- Protein Length: 3,460 amino acids
- Molecular Weight: ~388 kDa (one of the largest secreted proteins)
- UniProt ID: P78536
- PDB Structures: 7JX6, 7JX7 (reelin domains)
Reelin is a member of the reelin family of extracellular matrix proteins. It contains an N-terminal signal peptide, followed by a Reelin domain, 8 EGF-like repeats, and 3 Reelin repeat domains (R1-R3), each containing 300 amino acids.
¶ Domain Organization
- Signal peptide (aa 1-27): Secretory pathway targeting
- Reelin N-terminal domain (aa 28-189): Receptor binding
- EGF-like domains (aa 190-327): Protein-protein interactions
- Reelin repeat domains R1-R3 (aa 328-3460): Core functional domains
- R1: aa 328-711
- R2: aa 712-1095
- R3: aa 1096-1480
- C-terminal region (aa 1481-3460): Full-length reelin contains 8 repeats
Reelin is best known for its role in cortical lamination:[1]
- Secreted by Cajal-Retzius cells in the marginal zone
- Guides radial migration of neurons during development
- Controls proper positioning of pyramidal neurons in cortex
- Essential for layer formation in hippocampus and cerebellum
In the adult brain, Reelin modulates:[2]
- Long-term potentiation (LTP) and depression (LTD)
- Dendritic spine morphology and density
- Synaptic vesicle release probability
- NMDA receptor trafficking and function
Reelin is essential for:
- Spatial learning and memory
- Contextual fear conditioning
- Social behavior
- Mood regulation
Reelin is significantly implicated in AD pathogenesis:[3]
- Reelin expression is reduced in AD brains, particularly in the entorhinal cortex and hippocampus
- Amyloid-beta (Aβ) oligomers suppress Reelin expression
- Reduced Reelin contributes to synaptic dysfunction and memory impairment
- Reelin interacts with APP and affects amyloid precursor protein processing
- Reelin-containing neurons are vulnerable in AD
Reelin-Aβ Interaction:
- Aβ oligomers bind to Reelin receptors, disrupting downstream signaling
- This leads to impaired synaptic plasticity
- Contributes to early memory deficits before significant amyloid deposition
¶ Schizophrenia and Bipolar Disorder
Reelin is a major susceptibility factor:[4]
- RELN promoter hypermethylation reduces expression
- Reduced Reelin protein in prefrontal cortex
- Genetic variants associated with disease risk
- Developmental disruption of cortical layering
- Reduced Reelin levels in some ASD patients
- Mouse models show Reelin haploinsufficiency leads to ASD-like behaviors
- Interaction with autism-linked genes (CNTNAP2, FLNB)
- Reelin mutations cause lissencephaly in humans
- Altered Reelin signaling contributes to epileptogenesis
- Reelin supplementation reduces seizure frequency in models
| Approach |
Status |
Notes |
| Recombinant Reelin protein |
Research |
Purified protein administered peripherally |
| Reelin-enhancing compounds |
Preclinical |
Small molecules that increase Reelin expression |
| Gene therapy |
Preclinical |
AAV-mediated Reelin delivery |
| Peptide analogs |
Research |
Active Reelin fragments |
- No active clinical trials for Reelin-targeted therapy as of 2026
- Biomarker development ongoing (Reelin in CSF)
- Aβ-Reelin interaction blockers: Prevent Aβ-mediated Reelin dysfunction
- Dab1 activators: Downstream signaling molecule enhancement
- LRP8/ApoER2 agonists: Reelin receptor stimulation
The study of Reelin Protein has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
- D'Arcangelo G, et al. (1995). "Reelin is a glycoprotein of the extracellular matrix that dictates neuron migration." Nature. PMID:7643043
- Weeber EJ, et al. (2002). "Reelin and ApoE receptors cooperate to enhance hippocampal synaptic plasticity and learning." J Biol Chem. PMID:11741897
- Botella-López A, et al. (2006). "Reelin expression and glycosylation patterns in patients with Alzheimer's disease." J Neurochem. PMID:16478526
- Grayson DR, et al. (2005). "Reelin promoter hypermethylation in schizophrenia." Proc Natl Acad Sci USA. PMID:15677321