htr1b Gene

htr1b Gene

Introduction

Htr1B Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

<div class="infobox infobox-gene"> [@rommelfanger2007]

| Attribute | Value |
|-----------|-------|
| Gene Symbol | HTR1B |
| Full Name | 5-Hydroxytryptamine Receptor 1B |
| Chromosomal Location | 6q14.2 |
| NCBI Gene ID | [3351](https://www.ncbi.nlm.nih.gov/gene/3351) |
| Ensembl ID | ENSG00000149212 |
| UniProt ID | [P28222](https://www.uniprot.org/uniprot/P28222) |
| Gene Family | 5-HT1 receptor family (GPCR) |
| Protein Class | G protein-coupled receptor |
| Brain Expression | Basal Ganglia, Cortex, Hippocampus |

</div>}

Overview

The HTR1B gene encodes the 5-hydroxytryptamine receptor 1B (5-HT1B), an inhibitory G protein-coupled receptor (GPCR) that functions as both an autoreceptor regulating serotonin release and a heteroreceptor modulating other neurotransmitters. This receptor is widely expressed in the brain and plays key roles in mood regulation, aggression, impulsivity, and various neuropsychiatric disorders.

Molecular Function

Receptor Signaling

The 5-HT1B receptor couples to Gi/o proteins:

• Adenylate Cyclase Inhibition: Reduces cAMP levels
• GIRK Channel Activation: Causes neuronal hyperpolarization
• Calcium Channel Inhibition: Reduces neurotransmitter release
• ERK/MAPK Activation: Engages downstream signaling cascades

Autoreceptor Function

htr1b Gene

Introduction

Htr1B Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

<div class="infobox infobox-gene"> [@rommelfanger2007]

| Attribute | Value |
|-----------|-------|
| Gene Symbol | HTR1B |
| Full Name | 5-Hydroxytryptamine Receptor 1B |
| Chromosomal Location | 6q14.2 |
| NCBI Gene ID | [3351](https://www.ncbi.nlm.nih.gov/gene/3351) |
| Ensembl ID | ENSG00000149212 |
| UniProt ID | [P28222](https://www.uniprot.org/uniprot/P28222) |
| Gene Family | 5-HT1 receptor family (GPCR) |
| Protein Class | G protein-coupled receptor |
| Brain Expression | Basal Ganglia, Cortex, Hippocampus |

</div>}

Overview

The HTR1B gene encodes the 5-hydroxytryptamine receptor 1B (5-HT1B), an inhibitory G protein-coupled receptor (GPCR) that functions as both an autoreceptor regulating serotonin release and a heteroreceptor modulating other neurotransmitters. This receptor is widely expressed in the brain and plays key roles in mood regulation, aggression, impulsivity, and various neuropsychiatric disorders.

Molecular Function

Receptor Signaling

The 5-HT1B receptor couples to Gi/o proteins:

• Adenylate Cyclase Inhibition: Reduces cAMP levels
• GIRK Channel Activation: Causes neuronal hyperpolarization
• Calcium Channel Inhibition: Reduces neurotransmitter release
• ERK/MAPK Activation: Engages downstream signaling cascades

Autoreceptor Function

As an autoreceptor on serotonin [neurons](/entities/neurons):

• Located on nerve terminals (presynaptic)
• Negative feedback inhibition
• Modulates serotonin release
• Critical for mood and impulse control

Expression Pattern

Brain Distribution

| Region | Expression | Function |
|--------|------------|----------|
| Basal Ganglia | Very High | Motor control, reward |
| Substantia Nigra | High | Movement regulation |
| [Hippocampus](/brain-regions/hippocampus) | Moderate | Memory, mood |
| [Cortex](/brain-regions/cortex) | Moderate | Executive function |
| Raphe Nuclei | Moderate | Serotonergic cell bodies |

Cellular Localization

• Serotonergic neurons (presynaptic terminals)
• GABAergic interneurons
• Some glutamatergic neurons
• Dopaminergic neurons (heteroreceptor)

Disease Associations

Depression" style="color:#e0e0e0;margin:1.2rem 0 0.5rem;font-size:1rem;font-weight:600;border-bottom:1px solid rgba(255,255,255,0.08);padding-bottom:0.3rem">Depression

• Genetic Association: HTR1B polymorphisms linked to depression
• Antidepressant Effects: 5-HT1B modulation in treatment response
• Treatment Resistance: Potential target for refractory depression

Parkinson's Disease

• Motor Complications: Role in L-DOPA-induced dyskinesias
• Impulse Control Disorders: Associated with PD medication
• Non-Motor Symptoms: Depression and anxiety

Aggression and Impulsivity

• Aggressive Behavior: 5-HT1B in aggression pathways
• Impulse Control: Disorders linked to receptor function
• Substance Abuse: Alcohol and drug seeking behavior

Migraine

• Triptan Target: 5-HT1B/1D agonists for acute treatment
• Vasoconstriction: Cranial blood vessel constriction
• Pain Relief: Inhibition of trigeminal nociception

Therapeutic Targeting

Drug Classes

| Drug | Type | Indication |
|------|------|------------|
| Triptans | Agonist | Acute migraine |
| SSRIs | Indirect | Depression (affect 5-HT1B) |
| 5-HT1B antagonists | Antagonist | Depression (research) |

Research Applications

• Gene Therapy: Viral vector delivery
• Optogenetics: Circuit mapping
• Transgenic Models: Knockout mice

Key Publications

• PMID: 8365623(https://pubmed.ncbi.nlm.nih.gov/8365623/) - 5-HT1B receptor in aggression
• PMID: 10618706(https://pubmed.ncbi.nlm.nih.gov/10618706/) - Serotonin in PD

Background

The study of Htr1B Gene 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.

See Also

• [Genes Index](/genes)
• [Serotonin Receptors](/proteins)
• [Parkinson's Disease](/diseases/parkinsons-disease)

External Links

• [NCBI Gene HTR1B](https://www.ncbi.nlm.nih.gov/gene/3351)
• [UniProt P28222](https://www.uniprot.org/uniprot/P28222)

References