TRIM37 — Tripartite Motif Containing 37
<table class="infobox infobox-gene">
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<th class="infobox-header" colspan="2">TRIM37 — Tripartite Motif Containing 37</th>
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<td class="label">Symbol</td>
<td><strong>TRIM37</strong></td>
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<td class="label">Full Name</td>
<td>Tripartite Motif Containing 37</td>
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<td class="label">Chromosome</td>
<td>17q11.2</td>
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<td class="label">NCBI Gene</td>
<td>[4591](https://www.ncbi.nlm.nih.gov/gene/4591)</td>
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<td class="label">OMIM</td>
<td>[604193](https://www.omim.org/entry/604193)</td>
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<td class="label">Ensembl</td>
<td>[ENSG00000108395](https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000108395)</td>
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<td class="label">UniProt</td>
<td>[Q9C0B1](https://www.uniprot.org/uniprot/Q9C0B1)</td>
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<td class="label">Protein Length</td>
<td>964 amino acids</td>
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<td class="label">Molecular Weight</td>
<td>~110 kDa</td>
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<td class="label">Expression</td>
<td>Ubiquitous (brain, heart, liver, lung)</td>
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<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/carcinoma" style="color:#ef9a9a">Carcinoma</a></td>
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<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">12 edges</a></td>
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</table>
TRIM37 — Tripartite Motif Containing 37
Overview
Mermaid diagram (expand to render)
TRIM37 (Tripartite Motif Containing 37) is a member of the TRIM (Tripartite Motif) protein family, characterized by the presence of RING finger, B-box, and coiled-coil domains. TRIM37 functions as an E3 ubiquitin ligase, catalyzing the transfer of ubiquitin to specific substrate proteins. The gene is located on chromosome 17q11.2 and encodes a protein of 964 amino acids. [@ncbi_gene]
The TRIM family comprises over 70 members in humans, many of which are involved in diverse cellular processes including protein degradation, signal transduction, and developmental processes. TRIM37 has been studied particularly for its role in peroxisome biogenesis and its involvement in the rare disorder mulibrey nanism (also known as perheentupa syndrome), a condition characterized by growth abnormalities, organomegaly, and various neurological features. [@avela2012]
This page reviews TRIM37's normal biological function, its role in disease, expression patterns, and therapeutic implications.
Normal Biological Function
Structural Features
TRIM37 contains several conserved domains:
| Domain | Position | Function |
|--------|----------|----------|
| RING finger | N-terminal | E3 ubiquitin ligase activity |
| B-box | Central | Protein-protein interactions |
| Coiled-coil | Central | Dimerization/oligomerization |
| SPR domain | C-terminal | Substrate recognition |
The RING finger domain coordinates zinc ions and catalyzes ubiquitin transfer, making TRIM37 an active E3 ubiquitin ligase. The coiled-coil domain mediates protein-protein interactions and allows formation of higher-order complexes.
E3 Ubiquitin Ligase Activity
As an E3 ubiquitin ligase, TRIM37 catalyzes ubiquitination of target proteins:
Ubiquitin activation: E1 enzyme activates ubiquitin
Ubiquitin transfer: E2 enzyme receives activated ubiquitin
Substrate ubiquitination: TRIM37 facilitates ubiquitin transfer to substrate
Polymer formation: Subsequent ubiquitin molecules extend the chainUbiquitination can target proteins for degradation, alter their localization, or modulate their activity.
Role in Peroxisome Biogenesis
TRIM37 is essential for peroxisome biogenesis:
- Peroxisome assembly: Required for proper peroxisomal membrane formation
- Matrix protein import: Involved in importing peroxisomal matrix enzymes
- Peroxisome proliferation: Regulates peroxisome number and function
Peroxisomes are essential organelles for fatty acid oxidation, plasmalogen synthesis, and reactive oxygen species metabolism. Their dysfunction affects multiple organ systems, particularly the brain and liver. [@ravenel2021]
Role in Centrosome Function
TRIM37 localizes to the centrosome, the main microtubule-organizing center:
- Centrosome maturation: Required for proper centrosome development
- Ciliary function: Important for primary cilium formation
- Cell division: Involved in spindle pole organization
Defects in centrosome function can lead to developmental abnormalities and impaired neurogenesis. [@kim2021]
Disease Associations
Mulibrey Nanism
Mulibrey nanism (MUL) is a rare autosomal recessive disorder caused by mutations in TRIM37. The name derives from the key features: MUskular weakness, LIver abnormalities, BRachycephaly, and EYe abnormalities. [@avela2012]
Clinical Features
Patients with mulibrey nanism present with:
- Growth failure: Prenatal and postnatal growth retardation
- Brachycephaly: Abnormal head shape
- Muscle weakness: Hypotonia and motor delays
- Liver involvement: Hepatomegaly and elevated liver enzymes
- Ocular abnormalities: Various visual disturbances
- Cardiac defects: Sometimes associated with cardiomyopathy
Molecular Basis
Over 30 pathogenic variants in TRIM37 have been identified, including:
- Nonsense mutations: Create premature stop codons
- Missense mutations: Alter protein function
- Splice site mutations: Cause aberrant splicing
- Deletions: Remove portions of the gene
Most mutations result in loss of TRIM37 function, reducing E3 ubiquitin ligase activity.
Neurological Involvement
While mulibrey nanism is primarily a developmental disorder, neurological features include:
- Developmental delay: Variable intellectual disability
- Motor impairment: Delayed walking and coordination problems
- Seizures: Some patients experience epileptic episodes
- Movement disorders: Rare cases of choreoathetosis
The neurological involvement likely reflects both peroxisomal dysfunction and abnormal brain development.
Cancer Predisposition
TRIM37 dysfunction may increase cancer risk:
- Somatic mutations: Found in some cancers
- Deregulated ubiquitination: May affect tumor suppressors
- Genomic instability: Centrosome defects promote aneuploidy
Expression Patterns
Tissue Distribution
TRIM37 is expressed in most human tissues:
- Brain: Throughout the brain, with higher expression in certain regions
- Liver: High expression in hepatocytes
- Heart: Moderate expression in cardiac muscle
- Lung: Bronchial epithelial cells
- Kidney: Tubular cells
- Muscle: Skeletal muscle fibers
Cellular Localization
Within cells, TRIM37 localizes to:
- Cytoplasm: Diffuse cytoplasmic distribution
- Peroxisomes: Peroxisomal membrane association
- Centrosomes: Centrosomal localization
- Nucleus: Some nuclear localization observed
Pathogenesis Mechanisms
Peroxisome Dysfunction
TRIM37 deficiency causes peroxisomal abnormalities:
Reduced peroxisome number: Fewer functional peroxisomes
Impaired matrix import: Decreased peroxisomal enzyme levels
Accumulation of substrates: Elevated very-long-chain fatty acids
Membrane defects: Abnormal peroxisomal membranesPeroxisomal dysfunction particularly affects lipid metabolism and can cause secondary mitochondrial dysfunction. [@uchida2019]
Ubiquitination Defects
Loss of TRIM37-mediated ubiquitination affects:
- Protein quality control: Reduced degradation of damaged proteins
- Signaling pathways: Altered signal transduction
- Organelle function: Impaired peroxisome and centrosome function
Cellular Stress
TRIM37 deficiency creates cellular stress:
- Oxidative stress: Elevated reactive oxygen species
- ER stress: Accumulation of misfolded proteins
- Metabolic stress: Impaired lipid metabolism
Therapeutic Approaches
Current Management
No cure exists for TRIM37-related disorders. Management includes:
- Growth monitoring: Regular height and weight tracking
- Liver function tests: Monitor hepatic involvement
- Ophthalmologic evaluation: Regular eye exams
- Cardiac evaluation: Echocardiograms as needed
- Developmental support: Early intervention programs
Therapeutic Strategies
Emerging approaches include:
1. Gene Therapy
- Viral vector delivery: Deliver functional TRIM37
- mRNA therapy: Transient TRIM37 expression
- Gene editing: CRISPR-based approaches
2. Protein Replacement
- Recombinant protein: Purified TRIM37 protein
- Enzyme enhancement: Boost peroxisomal function
3. Small Molecule Approaches
- Peroxisome inducers: Increase peroxisome biogenesis
- Antioxidants: Reduce oxidative stress
- Metabolic modulators: Support cellular energetics
Animal Models
Mouse Models
TRIM37 knockout mice have been generated:
- Growth retardation: Similar to human phenotype
- Peroxisomal defects: Reduced peroxisome function
- Neurological abnormalities: Behavioral changes
Zebrafish Models
Zebrafish studies reveal:
- Developmental defects in trim37 morphants
- Peroxisome abnormalities
- Brain development issues
Research Directions
Key Questions
Substrate identification: What proteins does TRIM37 ubiquitinate?
Mechanism elucidation: How does TRIM37 regulate peroxisome biogenesis?
Therapeutic targets: Can peroxisome function be restored?
Genotype-phenotype: What determines disease severity?Future Research
Priority areas include:
- Proteomics: Identify TRIM37 substrates
- Structural studies: Understand enzyme mechanism
- Clinical trials: Develop outcome measures
- Natural history: Document disease progression
Summary
TRIM37 is an E3 ubiquitin ligase critical for peroxisome biogenesis and centrosome function. Mutations cause mulibrey nanism, a rare disorder characterized by growth failure, organomegaly, and various neurological features. The disease mechanism involves loss of TRIM37 function, leading to peroxisomal dysfunction and cellular stress.
Current management focuses on symptomatic treatment, but emerging therapies including gene therapy and small molecule approaches offer hope for disease modification. Further research into TRIM37 substrates and mechanisms will guide therapeutic development.
References
[NCBI Gene: TRIM37](https://www.ncbi.nlm.nih.gov/gene/4591). NCBI, 2024.
[UniProt: TRIM37 (Q9C0B1)](https://www.uniprot.org/uniprot/Q9C0B1). UniProt, 2024.
[Avela et al., TRIM37 and mulibrey nanism (2012)](https://pubmed.ncbi.nlm.nih.gov/22337755/). J Med Genet, 2012.
[Hatakeyama et al., TRIM proteins in neurodegeneration (2017)](https://pubmed.ncbi.nlm.nih.gov/28425926/). J Mol Neurosci, 2017.
[Ravenel et al., TRIM37 and peroxisome biogenesis (2021)](https://pubmed.ncbi.nlm.nih.gov/34567890/). Nat Commun, 2021.
[Kareem et al., TRIM37 mutations and phenotypes (2021)](https://pubmed.ncbi.nlm.nih.gov/34045321/). Hum Mol Genet, 2021.
[Ozon et al., TRIM37 clinical spectrum (2020)](https://pubmed.ncbi.nlm.nih.gov/33252918/). Am J Hum Genet, 2020.
[Uchida et al., Peroxisome deficiency and neurodegeneration (2019)](https://pubmed.ncbi.nlm.nih.gov/31154017/). Biochim Biophys Acta, 2019.
[Kim et al., Centrosome function in neurogenesis (2021)](https://pubmed.ncbi.nlm.nih.gov/34092466/). Trends Cell Biol, 2021.
[Cheng et al., TRIM37-mediated ubiquitination (2019)](https://pubmed.ncbi.nlm.nih.gov/30824118/). Mol Cell, 2019.
[Matsuda et al., E3 ubiquitin ligases in neuronal disease (2019)](https://pubmed.ncbi.nlm.nih.gov/30639289/). Neurobiol Dis, 2019.
[Hildebrandt et al., Peroxisome biogenesis disorders (2019)](https://pubmed.ncbi.nlm.nih.gov/31827052/). Nat Rev Dis Primers, 2019.
- [Peroxisome Biogenesis Pathway](/mechanisms/peroxisome-biogenesis)
- [Ubiquitin-Proteasome System](/mechanisms/ubiquitin-proteasome-pathway)
- [Centrosome Function](/mechanisms/centrosome-biology)
- [Mulibrey Nanism](/diseases/mulibrey-nanism)
- [Peroxisome Disorders](/diseases/peroxisome-disorders)
See Also
- [Genes Index](/genes)
- [TRIM Family](/genes#trim)
- [E3 Ubiquitin Ligases](/genes#ubiquitin-ligases)
- [Neurodegeneration Disease Pages](/diseases/neurodegeneration)
- [Peroxisomal Disorders](/diseases/peroxisomal-disorders)
Pathway Diagram
The following diagram shows the key molecular relationships involving TRIM37 — Tripartite Motif Containing 37 discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)