Homer1 — Homer Scaffold Protein 1 is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
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HOMER1
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Full Name: Homer Scaffold Protein 1
Chromosome: 5q14.1
NCBI Gene ID: 9456
OMIM: 604798
Ensembl ID: ENSG00000159307
UniProt: Q86YM7
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Associated Diseases: Autism spectrum disorder, schizophrenia, epilepsy, AD
Homer Scaffold Protein 1 (HOMER1) is a gene implicated in Autism spectrum disorder, schizophrenia, epilepsy, AD.
HOMER1 (Homer protein 1) is a postsynaptic scaffolding protein that binds to group I metabotropic glutamate receptors (mGluR1 and mGluR5) and regulates synaptic plasticity. It plays important roles in synaptic signaling, spine morphology, and long-term depression.
HOMER1 is part of the postsynaptic density complex and links mGluRs to downstream signaling pathways including PI3K and ERK. It exists in multiple isoforms generated by alternative splicing.
Polymorphisms in HOMER1 have been associated with autism spectrum disorder, schizophrenia, and epilepsy. Studies have also shown altered HOMER1 expression in Alzheimer's disease brains.
High expression in cerebral cortex, hippocampus, and basal ganglia. Localized to postsynaptic densities of excitatory synapses.
HOMER1 proteins contain an N-terminal EVH1 domain that binds to proline-rich motifs on target proteins including mGluRs, TRPV1 channels, and dynamin-3. The C-terminal coiled-coil domain mediates dimerization and multimerization, enabling scaffold formation.
The HOMER1b isoform is the major postsynaptic form and localizes to dendritic spines in a palmitoylation-dependent manner. HOMER1a is an activity-dependent immediate early gene product that competes with HOMER1b/c for binding partners.
HOMER1 dysfunction may contribute to synaptic deficits in neurodegenerative diseases. Strategies targeting HOMER1 interactions include:
HOMER1 is predominantly expressed in the brain, with highest levels in the cerebral cortex, hippocampus, and cerebellum. The protein is localized to:
HOMER1 exists as multiple isoforms generated by alternative splicing, with HOMER1a being an immediate-early gene induced by neuronal activity, while HOMER1b/c are constitutively expressed scaffold proteins.
The HOMER1 scaffolding complex is a potential therapeutic target:
| Approach | Status | Description |
|---|---|---|
| Peptide mimetics | Research | Cell-permeable peptides mimicking HOMER1 domains |
| Gene therapy | Preclinical | AAV-mediated HOMER1 delivery |
| Small molecule modulators | Research | Compounds that stabilize HOMER1 interactions |
The study of Homer1 — Homer Scaffold Protein 1 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.