PPP1R1B Gene

PPP1R1B Gene

Introduction

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">PPP1R1B Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>PPP1R1B</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Protein Phosphatase 1 Regulatory Inhibitor Subunit 1B</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>17q21.31</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>[5500](https://www.ncbi.nlm.nih.gov/gene/5500)</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>[168600](https://www.omim.org/entry/168600)</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000131759</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td>[Q9UDW6](https://www.uniprot.org/uniprot/Q9UDW6)</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td>[Parkinson's Disease](/diseases/parkinsons-disease), [Schizophrenia](/diseases/schizophrenia), [Huntington's Disease](/diseases/huntington-disease)</td>
</tr>
</table>

Ppp1R1B 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.

--- [@darppa]
title: PPP1R1B [@darppb]
:: infobox .infobox-gene
::

Overview

PPP1R1B Gene

Introduction

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">PPP1R1B Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>PPP1R1B</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Protein Phosphatase 1 Regulatory Inhibitor Subunit 1B</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>17q21.31</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>[5500](https://www.ncbi.nlm.nih.gov/gene/5500)</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>[168600](https://www.omim.org/entry/168600)</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000131759</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td>[Q9UDW6](https://www.uniprot.org/uniprot/Q9UDW6)</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td>[Parkinson's Disease](/diseases/parkinsons-disease), [Schizophrenia](/diseases/schizophrenia), [Huntington's Disease](/diseases/huntington-disease)</td>
</tr>
</table>

Ppp1R1B 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.

--- [@darppa]
title: PPP1R1B [@darppb]
:: infobox .infobox-gene
::

Overview

PPP1R1B encodes DARPP-32 (Dopamine and cAMP-Regulated Phosphoprotein of 32 kDa), a key signaling protein enriched in striatal medium spiny [neurons](/entities/neurons) (MSNs). DARPP-32 acts as a potent inhibitor of protein phosphatase 1 (PP1), modulating dopamine signaling and synaptic plasticity. It plays critical roles in motor control, reward learning, and cognitive functions, and its dysfunction is implicated in Parkinson's disease, Huntington's disease, and various neuropsychiatric disorders.

Function

DARPP-32 is a bifunctional signaling protein that acts as both a protein phosphatase 1 (PP1) inhibitor and a protein kinase A (PKA) substrate. When phosphorylated at Thr-34 by PKA, DARPP-32 becomes a high-affinity inhibitor of PP1, blocking the dephosphorylation of various substrates and amplifying dopamine signaling.

In striatal medium spiny neurons, DARPP-32 integrates signals from dopamine D1 and D2 receptors, regulating the activity of both the direct and indirect pathways of the basal ganglia. This integration is crucial for motor control, habit formation, and reward-based learning.

Key Molecular Functions

• PP1 Inhibition: Phosphorylated DARPP-32 binds to and inhibits PP1, preventing dephosphorylation of downstream targets
• PKA Amplification: DARPP-32 phosphorylated at Thr-34 enhances PKA signaling by inhibiting PP1
• Dopamine Signaling Modulation: Acts as a molecular switch between D1 and D2 receptor signaling pathways
• Synaptic Plasticity: Regulates [NMDA receptor](/entities/nmda-receptor) function and AMPA receptor trafficking

Disease Associations

Parkinson's Disease

DARPP-32 expression and phosphorylation are altered in Parkinson's disease. Loss of dopaminergic innervation to the striatum disrupts DARPP-32-mediated signaling, contributing to motor deficits. Studies show decreased DARPP-32 phosphorylation at Thr-34 in animal models of PD.

Huntington's Disease

DARPP-32 signaling is severely impaired in Huntington's disease. Mutant [huntingtin](/proteins/huntingtin) affects DARPP-32 expression and function in striatal neurons, contributing to the selective vulnerability of these cells. Altered DARPP-32 phosphorylation is observed in both animal models and human HD tissue.

Schizophrenia and Bipolar Disorder

DARPP-32 is implicated in antipsychotic drug action and the pathophysiology of schizophrenia. Genetic variations in PPP1R1B have been associated with schizophrenia risk, and DARPP-32 signaling is a target of typical and atypical antipsychotics.

Expression

PPP1R1B is highly expressed in the striatum (caudate nucleus and putamen), with highest levels in medium spiny neurons. Lower expression is found in the nucleus accumbens, olfactory tubercle, and cerebral [cortex](/brain-regions/cortex). In the brain, DARPP-32 is a specific marker for striatal medium spiny neurons.

Key Publications

Cross-Links

• [DARPP-32 Protein](/proteins/darpp32-protein)
• [DRD1 Gene](/genes/drd1)
• [DRD2 Gene](/genes/drd2)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Huntington's Disease](/diseases/huntington-disease)
• [Basal Ganglia Pathway](/mechanisms/basal-ganglia)

Background

The study of Ppp1R1B 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.

External Links

• [PubMed](https://pubmed.ncbi.nlm.nih.gov/) - Biomedical literature
• [Alzheimer's Disease Neuroimaging Initiative](https://adni.loni.usc.edu/) - Research data
• [Allen Brain Atlas](https://brain-map.org/) - Brain gene expression data

See Also

• [DARPP-32 Protein](/proteins/darpp32-protein)
• [DRD1 Gene](/genes/drd1)
• [DRD2 Gene](/genes/drd2)
• [PPP1R1A Gene](/genes/ppp1r1a)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Basal Ganglia Signaling](/brain-regions/basal-ganglia)

References