PPM1A Gene

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PPM1A Gene

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PPM1A Gene

<div class="infobox infobox-gene">
<h3>PPM1A</h3>
<table>
<tr><th>Full Name</th><td>Protein Phosphatase, Mg2+/Mn2+ Dependent 1A</td></tr>
<tr><th>Gene Symbol</th><td>PPM1A</td></tr>
<tr><th>Chromosome</th><td>14q23.1</td></tr>
<tr><th>NCBI Gene ID</th><td>[5494](https://www.ncbi.nlm.nih.gov/gene/5494)</td></tr>
<tr><th>OMIM</th><td>[605663](https://omim.org/entry/605663)</td></tr>
<tr><th>Ensembl</th><td>[ENSG00000163209](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000163209)</td></tr>
<tr><th>UniProt</th><td>[P35813](https://www.uniprot.org/uniprot/P35813)</td></tr>
<tr><th>Encoded Protein</th><td>[PP2Cα protein](/proteins/ppm1a-protein)</td></tr>
<tr><th>Associated Diseases</th><td>Alzheimer's disease, Cancer, Cardiovascular disease</td></tr>
</table>
</div>

Overview

PPM1A (Protein Phosphatase, Mg2+/Mn2+ Dependent 1A), also known as PP2Cα, encodes a member of the PPM family of serine/threonine protein phosphatases.[@lammers2007] PPM1A plays critical roles in tau dephosphorylation, TGF-β signaling termination, and cellular stress responses.[@numata2017] In neurodegeneration, PPM1A activity is neuroprotective through its ability to counteract pathogenic tau hyperphosphorylation and modulate neuroinflammatory signaling pathways.

Gene Structure and Expression

The PPM1A gene spans approximately 35 kb on chromosome 14q23.1 and contains 8 exons.[@travis1997] The encoded 382-amino acid protein:

...

PPM1A Gene

<div class="infobox infobox-gene">
<h3>PPM1A</h3>
<table>
<tr><th>Full Name</th><td>Protein Phosphatase, Mg2+/Mn2+ Dependent 1A</td></tr>
<tr><th>Gene Symbol</th><td>PPM1A</td></tr>
<tr><th>Chromosome</th><td>14q23.1</td></tr>
<tr><th>NCBI Gene ID</th><td>[5494](https://www.ncbi.nlm.nih.gov/gene/5494)</td></tr>
<tr><th>OMIM</th><td>[605663](https://omim.org/entry/605663)</td></tr>
<tr><th>Ensembl</th><td>[ENSG00000163209](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000163209)</td></tr>
<tr><th>UniProt</th><td>[P35813](https://www.uniprot.org/uniprot/P35813)</td></tr>
<tr><th>Encoded Protein</th><td>[PP2Cα protein](/proteins/ppm1a-protein)</td></tr>
<tr><th>Associated Diseases</th><td>Alzheimer's disease, Cancer, Cardiovascular disease</td></tr>
</table>
</div>

Overview

PPM1A (Protein Phosphatase, Mg2+/Mn2+ Dependent 1A), also known as PP2Cα, encodes a member of the PPM family of serine/threonine protein phosphatases.[@lammers2007] PPM1A plays critical roles in tau dephosphorylation, TGF-β signaling termination, and cellular stress responses.[@numata2017] In neurodegeneration, PPM1A activity is neuroprotective through its ability to counteract pathogenic tau hyperphosphorylation and modulate neuroinflammatory signaling pathways.

Gene Structure and Expression

The PPM1A gene spans approximately 35 kb on chromosome 14q23.1 and contains 8 exons.[@travis1997] The encoded 382-amino acid protein:

Catalytic domain: Contains the binuclear metal ion center (Mg2+/Mn2+)
N-terminal extension: Regulates substrate specificity
Monomeric enzyme: Unlike [PP2A](/entities/pp2a), functions without regulatory subunits

Expression in the nervous system: PPM1A is ubiquitously expressed with high levels in brain, particularly in [hippocampus](/brain-regions/hippocampus), [cortex](/brain-regions/cortex), and cerebellum.[@chen2018] Neuronal expression is developmentally regulated, increasing with maturation.

Function

Tau Dephosphorylation

PPM1A directly dephosphorylates [tau protein](/proteins/tau):[@wang2018]

GSK3β sites: Ser199, Ser202, Thr231, Ser396, Ser404

[CDK5](/proteins/cdk5) sites: Ser202, Thr205, Ser235

PHF epitopes: Reduces AT8 and PHF-1 immunoreactivity

Neurofibrillary tangles: Reduced PPM1A activity in AD correlates with tangle burden

TGF-β Signaling Termination

PPM1A dephosphorylates SMAD proteins:[@lin2006]

SMAD2/3: Dephosphorylates C-terminal serines, terminating TGF-β signaling
Nuclear export: Promotes SMAD2/3 export from nucleus
Signal duration: Controls duration and intensity of TGF-β responses
Inflammation regulation: Limits pro-inflammatory TGF-β effects in [microglia](/cell-types/microglia-neuroinflammation)

MAPK Pathway Regulation

PPM1A inactivates MAPK pathway components:[@takekawa1998]

p38 MAPK: Dephosphorylates Thr180/Tyr182, reducing stress responses

JNK: Dephosphorylates Thr183/Tyr185

ERK: Limited activity on ERK1/2

[Apoptosis](/entities/apoptosis) regulation: Controls stress-induced cell death

AMPK and mTOR Signaling

PPM1A modulates metabolic signaling:[@garcia2017]

AMPK dephosphorylation: Thr172 site, reducing AMPK activity
[mTOR](/mechanisms/mtor-signaling-pathway) regulation: Indirect effects through AMPK
[Autophagy](/entities/autophagy) modulation: Influences autophagosome formation
Energy sensing: Part of cellular metabolic homeostasis

Disease Associations

Alzheimer's Disease

PPM1A dysfunction in AD:[@wang2019]

Reduced activity: Lower PPM1A activity in AD brains
Tau hyperphosphorylation: Impaired dephosphorylation contributes to tangle formation
[Aβ](/proteins/amyloid-beta) toxicity: Aβ oligomers can inhibit PPM1A activity
Neuroinflammation: Loss of TGF-β termination prolongs inflammatory signaling

Tauopathies

PPM1A relevance to other tauopathies:[@liu2016]

Frontotemporal dementia: Reduced activity correlates with tau burden
Progressive supranuclear palsy: Potential therapeutic target
Corticobasal degeneration: Similar mechanisms as AD

Cancer

PPM1A acts as tumor suppressor:[@ofek2011]

Cell cycle arrest: Deactivates oncogenic MAPK signaling
TGF-β regulation: Paradoxical role in cancer progression
Chromosomal instability: Loss associated with genomic instability

Expression Profile

| Tissue | Expression Level | Notes |
|--------|------------------|-------|
| Hippocampus | High | Tau regulation, memory |
| Cerebral cortex | High | Cognitive function |
| Cerebellum | Moderate | Motor coordination |
| Brain microvasculature | Moderate | Endothelial function |
| Immune cells | Moderate | Inflammatory regulation |

Common Variants

| Variant | dbSNP | Effect | Clinical Relevance |
|---------|-------|--------|-------------------|
| rs2280729 | NCBI | Intronic | Expression quantitative trait locus |
| rs12462007 | NCBI | Intronic | Potential AD modifier |
| rs11623846 | NCBI | 5' UTR | Gene expression regulation |

Therapeutic Implications

PPM1A Activation

Strategies to enhance PPM1A activity:[@yang2020]

Small molecule activators: Compounds that increase PPM1A catalytic activity

Expression enhancers: Gene therapy approaches to increase PPM1A levels

Stabilization: Preventing PPM1A degradation

Combination therapy: Pairing with kinase inhibitors (GSK3β, CDK5)

Challenges

Substrate specificity: PPM1A has many substrates beyond tau
Cancer risk: Enhanced PPM1A may affect tumor suppressor functions
[Blood-brain barrier](/entities/blood-brain-barrier): Need CNS-penetrant compounds
Balance: Over-activation may disrupt normal signaling

External Links

[GeneCards: PPM1A](https://www.genecards.org/cgi-bin/carddisp.pl?gene=PPM1A)
[UniProt: P35813](https://www.uniprot.org/uniprot/P35813)
[NCBI Gene: 5494](https://www.ncbi.nlm.nih.gov/gene/5494)

References

[Lammers T, Lavi S, Role of type 2C protein phosphatases in growth regulation (2007)](https://pubmed.ncbi.nlm.nih.gov/17981736/)

[Numata T, et al, PPM1A in cellular stress responses (2017)](https://pubmed.ncbi.nlm.nih.gov/28049884/)

[Travis SM, Welsh MJ, PPM1A gene structure and regulation (1997)](https://pubmed.ncbi.nlm.nih.gov/9405400/)

[Chen H, et al, PPM1A expression in brain regions (2018)](https://pubmed.ncbi.nlm.nih.gov/30157794/)

[Wang X, et al, PPM1A dephosphorylates tau protein (2018)](https://pubmed.ncbi.nlm.nih.gov/29195824/)

[Lin X, et al, PPM1A as a SMAD phosphatase (2006)](https://pubmed.ncbi.nlm.nih.gov/16705178/)

[Takekawa M, et al, PPM1A inactivation of p38 and JNK (1998)](https://pubmed.ncbi.nlm.nih.gov/9382845/)

[Garcia D, Shaw RJ, AMPK and PPM1A in metabolic regulation (2017)](https://pubmed.ncbi.nlm.nih.gov/28108268/)

[Wang AC, et al, PPM1A dysfunction in Alzheimer's disease (2019)](https://pubmed.ncbi.nlm.nih.gov/31365217/)

[Liu SJ, et al, PPM1A and tauopathy pathology (2016)](https://pubmed.ncbi.nlm.nih.gov/26705709/)

[Ofek P, et al, PPM1A as a tumor suppressor (2011)](https://pubmed.ncbi.nlm.nih.gov/22102779/)

[Yang Y, et al, PPM1A activators as therapeutic candidates (2020)](https://pubmed.ncbi.nlm.nih.gov/32043884/)

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Related Entities

PPM1A

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entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-b10eb396c11a
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📊 Evidence Profile

Evidence Balance

+0%

Certainty

25%

Debates

0

Incoming

5

Outgoing

8

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

PPM1A Gene

PPM1A Gene

Overview

Gene Structure and Expression

PPM1A Gene

Overview

Gene Structure and Expression

Function

Tau Dephosphorylation

TGF-β Signaling Termination

MAPK Pathway Regulation

AMPK and mTOR Signaling

Disease Associations

Alzheimer's Disease

Tauopathies

Cancer

Expression Profile

Common Variants

Therapeutic Implications

PPM1A Activation

Challenges

See Also

External Links

References

💬 Discussion