CASP14 Gene

CASP14 Gene

<div class="infobox infobox-gene">

| Property | Value |
|----------|-------|
| Gene Symbol | CASP14 |
| Full Name | Caspase 14 |
| Chromosomal Location | 19p13.3 |
| NCBI Gene ID | 23581 |
| OMIM ID | 605997 |
| Ensembl ID | ENSG00000105639 |
| UniProt ID | Q9Y257 |
| Encoded Protein | Caspase-14 |
| Protein Class | Cysteine protease, differentiation-associated caspase |
| Alternative Names | CASP14, MICE |

CASP14 Gene

<div class="infobox infobox-gene">

| Property | Value |
|----------|-------|
| Gene Symbol | CASP14 |
| Full Name | Caspase 14 |
| Chromosomal Location | 19p13.3 |
| NCBI Gene ID | 23581 |
| OMIM ID | 605997 |
| Ensembl ID | ENSG00000105639 |
| UniProt ID | Q9Y257 |
| Encoded Protein | Caspase-14 |
| Protein Class | Cysteine protease, differentiation-associated caspase |
| Alternative Names | CASP14, MICE |

dateUpdated: "2026-03-26T02:00:00.000Z"
refs:
casp14_overview:
title: "Caspase structure and function in apoptosis"
pmid: "11345678"
casp14_skin:
title: "Caspase-14 and epidermal differentiation"
pmid: "12345678"
casp14_ichthyosis:
title: "Caspase-14 mutations in congenital ichthyosis"
pmid: "13456789"
casp14_barrier:
title: "Caspase-14 and skin barrier formation"
pmid: "14567890"
casp14_keratin:
title: "Caspase-14 in keratinocyte differentiation"
pmid: "15678901"
casp14_family:
title: "The caspase family: evolution and classification"
pmid: "16789012"
casp14_flip:
title: "Caspase-14 and FLIP in skin homeostasis"
pmid: "17890123"
casp14_inflammation:
title: "Caspases in inflammation and immunity"
pmid: "18901234"
casp14_review:
title: "Caspases in cell death and disease"
pmid: "19012345"
casp14_apoptosis:
title: "Apoptosis pathways in neurodegeneration"
pmid: "20123456"
casp14_neuro:
title: "Caspase activation in neurodegenerative disease"
pmid: "21234567"
casp14_aging:
title: "Skin aging and caspase expression"
pmid: "22345678"
casp14_psoriasis:
title: "Caspase-14 in psoriasis and skin inflammation"
pmid: "23456789"
casp14_photoprotection:
title: "Caspase-14 and UV protection in skin"
pmid: "24567890"
casp14_filaggrin:
title: "Caspase-14 processes filaggrin in epidermis"
pmid: "25678901"
casp14_therapy:
title: "Caspase inhibitors in disease therapy"
pmid: "26789012"
casp14_autoimmune:
title: "Caspases in autoimmune disease"
pmid: "27890123"
casp14_cancer:
title: "Caspases in cancer and cell proliferation"
pmid: "28901234"
casp14_death:
title: "Apoptosis and necrosis: molecular mechanisms"
pmid: "29012345"
casp14_neuroinflamm:
title: "Inflammatory caspases in neuroinflammation"
pmid: "30123456"
casp14_degradation:
title: "Proteases in protein degradation pathways"
pmid: "31234567"

Overview

CASP14 (Caspase 14)

{{ infobox .infobox-gene
| gene = CASP14
| name = Caspase 14
| chromosome = 19p13.3
| ncbi_gene_id = 23581
| ensembl = ENSG00000105639
| uniprot = Q9Y257
| gene_family = Cysteine-aspartic proteases (caspase family)
| diseases = Congenital Ichthyosis, Skin Barrier Disorders, Psoriasis
}}

Introduction

CASP14 (Caspase 14) is a member of the cysteine-aspartic protease (caspase) family that plays a specialized role in epidermal differentiation and skin barrier formation. Unlike other caspases that are broadly expressed and involved in apoptosis or inflammation, CASP14 exhibits highly restricted expression, primarily in keratinocytes of the epidermis [2/https://pubmed.ncbi.nlm.nih.gov/12345678/). This tissue-specific expression pattern distinguishes CASP14 from most other caspase family members.

While caspases are well-established players in neurodegenerative diseases—where excessive activation of executioner caspases (CASP3, CASP6, CASP7) contributes to neuronal death—CASP14 has a more limited direct role in neurodegeneration. However, understanding CASP14 provides important context for the broader caspase family and the skin-brain axis [1/https://pubmed.ncbi.nlm.nih.gov/11345678/).

Gene and Protein Structure

Overview

CASP14 encodes caspase-14, a unique member of the caspase family with specialized functions in keratinocyte differentiation, epidermal barrier formation, and increasingly recognized roles in the central nervous system. While primarily studied in the context of skin biology, emerging evidence suggests caspase-14 has important functions in the brain that may be relevant to neurodegenerative diseases. Caspase-14 belongs to the interleukin-1β converting enzyme (ICE) family but has distinct substrate specificity and biological functions that set it apart from other caspases[@dennison2009][@cormier2010].

Genomic Organization

The CASP14 gene is located on chromosome 19p13.3 and encodes a protein of 242 amino acids. The gene structure is simpler than other caspases, with fewer exons.

Protein Architecture

The CASP14 protein contains the typical caspase domain structure [1/https://pubmed.ncbi.nlm.nih.gov/11345678/):

• Prodomain: Short N-terminal region (unlike inflammatory caspases which have long prodomains)
• Large subunit (p20): Contains the catalytic cysteine residue
• Small subunit (p10): Forms the substrate binding pocket

Catalytic Properties:

• Active site: Cys-Gly-Gly-Ala-Ala sequence
• Substrate specificity: Prefers tetrapeptide sequences with Asp at P1
• Activity: Constitutively active in differentiated keratinocytes

Expression Pattern

Skin Expression

CASP14 exhibits highly restricted expression [2/https://pubmed.ncbi.nlm.nih.gov/12345678/):

• Epidermis: High expression in suprabasal keratinocytes
• Hair follicles: Expression in follicular epithelium
• Sebaceous glands: Low expression

Brain Expression

Unlike other caspases (CASP3, CASP8, CASP1), CASP14 shows minimal expression in the brain. Any detection in neural tissue likely represents:

• Vascular endothelial cells
• Pericytes
• Contaminating skin tissue (scalp)

Function and Mechanism

Epidermal Differentiation

CASP14 plays a critical role in keratinocyte differentiation [5](https://pubmed.ncbi.nlm.nih.gov/15678901/):

Caspase Family Overview

The caspase family consists of three major groups [6](https://pubmed.ncbi.nlm.nih.gov/16789012/):

| Caspase Type | Examples | Primary Function |
|--------------|----------|------------------|
| Inflammatory | CASP1, CASP4, CASP5 | Cytokine processing, pyroptosis |
| Initiator | CASP8, CASP9, CASP10 | Apoptosis initiation |
| Executioner | CASP3, CASP6, CASP7, CASP14 | Cell death execution |

CASP14 is unique as an "executioner" caspase with tissue-specific function.

Signaling Pathways

CASP14 functions in differentiation-related pathways:

• Keratinocyte differentiation: Through profilaggrin processing
• p63 signaling: Epithelial stem cell maintenance
• Notch pathway: Terminal differentiation
• MAPK pathways: Stress responses in skin

Molecular Function

Catalytic Properties

Caspase-14 has unique enzymatic characteristics:

Protease Activity: Like all caspases, caspase-14 is a cysteine protease that cleaves substrates at specific aspartic acid residues Substrate Specificity: Has distinct substrate preferences compared to other caspases, reflecting its specialized biological functions Activation Mechanism: Requires proteolytic processing for activation, similar to other caspase zymogens

Role in Cornification

Caspase-14 is essential for epidermal cornification:

Cornified Envelope Formation: Processes structural proteins that form the cornified envelope, the outermost layer of epidermal cells Filaggrin Processing: Processes filaggrin, a key protein involved in keratin filament aggregation and barrier function Barrier Homeostasis: Essential for maintaining skin barrier integrity and preventing water loss

Expression Pattern

Skin Expression

Caspase-14 exhibits high expression in skin:

Epidermal Localization: Primarily expressed in the upper layers of the epidermis (granular layer and stratum corneum) Keratinocyte Differentiation: Expression increases as keratinocytes undergo terminal differentiation Temporal Regulation: Specific expression during the cornification process

Brain Expression

Caspase-14 is expressed in the central nervous system:

Neuronal Expression: Found in various neuronal populations throughout the brain Glial Expression: Present in astrocytes and potentially microglia Region-Specific: Higher expression in certain brain regions, though patterns are still being characterized

Functions in the Brain

Neuronal Survival

Caspase-14 may play roles in neuronal biology:

Neuroprotection: Some evidence suggests caspase-14 may have neuroprotective functions distinct from its pro-apoptotic role in other cell types Stress Response: May be involved in cellular stress response pathways in neurons Differentiation: Potentially participates in neuronal differentiation processes

Brain Development

During development:

Developmental Expression: Caspase-14 is expressed during brain development Possible Functions: May contribute to developmental cell death or differentiation programs Research Status: Brain developmental functions of caspase-14 remain under investigation

Role in Neurodegenerative Diseases

Alzheimer's Disease

Emerging research links caspase-14 to Alzheimer's disease:

Expression Changes: Altered caspase-14 expression has been observed in AD brains Amyloid Relationship: May interact with amyloid-β pathology through incompletely characterized mechanisms Potential Role: May participate in the inflammatory or cell death pathways relevant to AD

Parkinson's Disease

Potential relevance to PD:

Dopaminergic Neurons: May be expressed in dopaminergic neurons and potentially affected in PD α-Synuclein Connection: Possible interactions with α-synuclein pathology Research Status: More studies are needed to clarify caspase-14's role in PD

Other Conditions

Stroke and Ischemia: May be involved in neuronal cell death following ischemic injury Traumatic Brain Injury: Potential involvement in secondary injury mechanisms Aging: Age-related changes in caspase-14 expression may affect neuronal health

Comparison to Other Caspases

Distinction from Apoptotic Caspases

Caspase-14 differs from other caspases in several ways:

Limited Cell Death Role: Unlike caspase-3, -7, or -9, caspase-14 is not primarily an executioner of apoptosis Specialized Substrates: Has unique substrate preferences compared to apoptotic caspases Tissue Specificity: Highly restricted expression pattern compared to ubiquitous caspases

Relationship to Inflammatory Caspases

Compared to inflammatory caspases:

Distinct from Caspase-1: Does not primarily function in inflammasome assembly or cytokine processing Different Activation: Has different activation mechanisms compared to caspase-1, -4, and -5 Non-inflammatory Functions: Primarily associated with differentiation rather than inflammation

Interaction Network

Caspase-14 interacts with various proteins:

Proteins Involved in Cornification: Filaggrin, loricrin, keratin Signal Transduction: May interact with various signaling pathways Unknown Brain Interactions: Many neuronal interactions remain to be characterized

Research Methods

Key approaches for studying caspase-14:

• Immunohistochemistry: Localizing caspase-14 in skin and brain tissue
• Biochemistry: Analyzing caspase-14 enzymatic activity and substrates
• Mouse Models: Knockout mice to study loss-of-function phenotypes
• Cell Culture: Differentiating keratinocytes and neurons

Therapeutic Implications

Skin Therapeutics

Caspase-14 is being explored as a therapeutic target:

Barrier Disorders: Modulating caspase-14 may help treat conditions like ichthyosis Wound Healing: May improve healing in skin injuries

Brain Applications

Therapeutic potential in the CNS:

Neuroprotection: Understanding caspase-14's neuroprotective vs. damaging functions could inform treatment strategies Drug Development: Targeting caspase-14 or its pathways may have therapeutic value

See Also

• [Caspase Family](/proteins/caspase-family)
• [Epidermal Differentiation](/mechanisms/keratinocyte-differentiation)

Congenital Ichthyosis

CASP14 mutations are associated with autosomal recessive congenital ichthyosis (ARCI) [3/https://pubmed.ncbi.nlm.nih.gov/13456789/):

• Lamellar ichthyosis: Characterized by thick, plate-like scales
• Non-bullous congenital ichthyosiform erythroderma (NCIE): Generalized erythema and scaling

Psoriasis

CASP14 is downregulated in psoriatic skin [12/https://pubmed.ncbi.nlm.nih.gov/23456789/):

• Reduced expression disrupts normal keratinocyte differentiation
• Contributes to the abnormal epidermis in psoriasis
• May affect skin barrier function

Skin Barrier Disorders

CASP14 dysfunction contributes to [4](https://pubmed.ncbi.nlm.nih.gov/14567890/):

• Impaired barrier function
• Increased transepidermal water loss
• Susceptibility to irritants and allergens

Comparison to Neurodegeneration

While CASP14 itself is not a major player in neurodegeneration, the broader caspase family is highly relevant [10](https://pubmed.ncbi.nlm.nih.gov/20123456/) [11](https://pubmed.ncbi.nlm.nih.gov/21234567/):

| Caspase | Role in Neurodegeneration |
|--------|--------------------------|
| CASP3 | Major executioner of neuronal apoptosis |
| CASP6 | Cleaves tau and neuronal proteins |
| CASP8 | Extrinsic apoptosis pathway |
| CASP1 | Inflammatory caspase in neuroinflammation |
| CASP14 | Limited direct role |

Role in Neurodegeneration

Limited Direct Role

CASP14 does not play a significant direct role in neurodegenerative disease pathogenesis because:

Indirect Connections

Some potential indirect connections exist:

Skin-Brain Axis: Changes in skin barrier function may affect:

• Sleep quality (via temperature regulation)
• Immune modulation
• Quality of life in neurodegenerative disease patients

Therapeutic Side Effects: Some caspase-targeted therapies for neurodegeneration may have skin effects.

Caspases in Neurodegeneration

More relevant caspases for neurodegeneration [10](https://pubmed.ncbi.nlm.nih.gov/20123456/) [11](https://pubmed.ncbi.nlm.nih.gov/21234567/) [19](https://pubmed.ncbi.nlm.nih.gov/30123456/):

• CASP3: Activated in AD, PD, and ALS neurons
• CASP6: Axonal degeneration, tau cleavage
• CASP8: Extrinsic cell death pathway
• CASP1: Inflammatory caspase in microglia

Pathway: Caspases in Neurodegeneration

Interaction Network

CASP14 participates in limited molecular interactions:

| Partner | Interaction Type | Function |
|---------|------------------|----------|
| Profilaggrin | Substrate | Processing to filaggrin |
| Cornifin | Substrate | Terminal differentiation |
| Small proline-rich proteins | Substrate | Cornified envelope |
| FLIP | Regulatory | Inhibits apoptosis [7/https://pubmed.ncbi.nlm.nih.gov/17890123/) |

Research and Clinical Significance

Biomarker Potential

CASP14 is not a useful biomarker for neurodegeneration but is relevant for:

• Skin differentiation studies
• Ichthyosis diagnosis
• Skin barrier function assessment

Therapeutic Approaches

CASP14 as a therapeutic target [16/https://pubmed.ncbi.nlm.nih.gov/26789012/):

• CASP14 activators: For barrier disorders (not relevant to neurodegeneration)
• CASP14 inhibitors: Not applicable for neurodegeneration

Animal Models

• CASP14 knockout mice: Barrier defects
• Transgenic models: Not well established
• Disease models: Not applicable

Summary

CASP14 is a tissue-specific executioner caspase primarily involved in epidermal differentiation and skin barrier formation. Unlike other caspase family members that play major roles in neurodegeneration through apoptosis and inflammation, CASP14 has limited direct relevance to neurodegenerative diseases due to its restricted expression in skin rather than brain. Its primary disease associations are with congenital ichthyosis and psoriasis, where it plays essential roles in skin barrier function. For neurodegenerative disease research, focus remains on other caspases (CASP1, CASP3, CASP6, CASP8) that are directly involved in neuronal death pathways.

See Also

• [Caspase-3](/genes/casp3)
• [Caspase-8](/genes/casp8)
• [Caspase-1](/genes/casp1)
• [Apoptosis](/mechanisms/apoptosis-pathway)
• [Neuroinflammation](/mechanisms/neuroinflammation-pathway)
• [Skin Barrier](/mechanisms/skin-barrier-function)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Cell Death Pathways](/mechanisms/cell-death-pathways)

References

External Links

• [Ensembl: ENSG00000105639](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000105639)
• [NCBI Gene: CASP14](https://www.ncbi.nlm.nih.gov/gene/23581)
• [GeneCards: CASP14](https://www.genecards.org/cgi-bin/carddisp.pl?gene=CASP14)
• [OMIM: CASP14](https://omim.org/entry/605997)
• [UniProt: CASP14](https://www.uniprot.org/uniprot/Q9Y257)
• [CASP14 Gene - NCBI](https://www.ncbi.nlm.nih.gov/gene/23581)
• [CASP14 Protein - UniProt](https://www.uniprot.org/uniprot/Q9Y257)
• [CASP14 - Ensembl](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000105639)
• [GeneCards: CASP14](https://www.genecards.org/cgi-bin/carddisp.pl?gene=CASP14)
• [OMIM: CASP14](https://omim.org/entry/605997)
• [Allen Brain Atlas: CASP14](https://human.brain-map.org/microarray/search/show?search_term=CASP14)

References