| Property | Value | [1] |
|----------|-------| [2] |
| Gene Symbol | TGFBI |
| Full Name | Transforming Growth Factor Beta Induced Protein |
| Chromosomal Location | 5q31.1 |
| NCBI Gene ID | 7045 |
| OMIM ID | 601692 |
| Ensembl ID | ENSG00000120708 |
| UniProt ID | Q15582 |
| Encoded Protein | TGF-beta-induced protein |
| Associated Diseases | Alzheimer's Disease, Parkinson's Disease, Amyotrophic Lateral Sclerosis, Corneal Dystrophies, Cancer |
TGFBI (Transforming Growth Factor Beta Induced Protein), also known as βig-h3 or kerato-epithelin, is a secreted extracellular matrix (ECM) protein that plays crucial roles in cell adhesion, tissue development, and disease pathogenesis. First identified as a TGF-β-inducible gene, this 683-amino acid protein has expanded from its original characterization in corneal biology to significant roles in neurodegenerative diseases, cancer, and tissue remodeling.
The protein is distinguished by its unique domain architecture featuring an N-terminal cysteine-rich (Cys-rich) domain and four C-terminal fasciclin-1 (FAS1) domains that mediate interactions with various extracellular partners including integrins, collagen, and other ECM components. This interaction network positions TGFBI as a critical nexus between cells and their microenvironment, influencing processes ranging from cell migration to apoptosis and neuroinflammation.
The TGFBI gene is located on chromosome 5q31.1 (positions 136,000,000-136,100,000, GRCh38) on the minus strand. The gene spans approximately 17 kb and comprises 17 exons that encode a 683-amino acid secreted protein with a molecular weight of approximately 75 kDa.
TGFBI shows conservation across vertebrates with domain architecture preserved:
| Species | Gene Name | Amino Acids | Identity |
|---|---|---|---|
| Human | TGFBI | 683 | Reference |
| Mouse | Tgfbi | 681 | 82% |
| Zebrafish | tgfbi | 674 | 68% |
| Chicken | TGFBI | 680 | 79% |
The FAS1 domains show particularly high conservation, reflecting their essential structural and functional roles.
TGFBI contains several distinct functional domains [3]:
TGFBI undergoes several modifications:
TGFBI participates in multiple cellular processes:
TGFBI plays essential roles in embryonic development:
The protein supports fundamental cell-matrix interactions:
TGFBI modulates immune responses:
TGFBI has significant involvement in Alzheimer's Disease pathogenesis [4]:
Dopaminergic neuron expression:
Neuroinflammation:
As characterized in [8]:
TGFBI mutations cause several inherited corneal disorders:
| Disorder | Mutation Type | Phenotype |
|---|---|---|
| Avellino dystrophy | R124H | Granular deposits |
| Lattice dystrophy | Various | Lattice-like deposits |
| Reis-Bücklers dystrophy | R124L | Geographic opacity |
| Thiel-Behnke dystrophy | R124Q | Honeycomb pattern |
TGFBI shows altered expression in various malignancies:
TGFBI shows tissue-specific expression:
| Tissue | Expression Level | Notable Cell Types |
|---|---|---|
| Cornea | Highest | Corneal epithelium |
| Brain | Moderate | Astrocytes, neurons, microglia |
| Lung | Moderate | Alveolar epithelial cells |
| Bone | Moderate | Osteoblasts |
| Kidney | Moderate | Tubular epithelial cells |
| Heart | Low-moderate | Cardiomyocytes |
Within the central nervous system, TGFBI is expressed in:
TGFBI activates multiple integrin signaling pathways:
TGFBI serves as a biomarker:
Current therapeutic strategies include:
Key questions remain:
| Interactor | Interaction Type | Function |
|---|---|---|
| Integrins (α3β1, αvβ3, α6β4) | Binding | Cell adhesion |
| Collagen (I, II, IV, VI) | Binding | ECM organization |
| Fibronectin | Binding | Matrix assembly |
| Heparin/heparan sulfate | Binding | Proteoglycan interactions |
Thapa N et al. TGFBI (βig-h3) is a multifunctional matrix protein with roles in development and disease. 2008. ↩︎
Kim JE et al. TGFBI in extracellular matrix remodeling and fibrosis. 2019. ↩︎
Schubert C et al. TGFBI and integrin interactions in health and disease. 2019. ↩︎
Hanoudi E et al. Characterization of the human TGFBI gene and analysis of its role in Alzheimer's disease. 2004. ↩︎
Sánchez-Tillo E et al. TGFBI expression in Alzheimer's disease and its regulation by inflammatory stimuli. 2013. ↩︎
Runz S et al. TGFBI variants and amyloid pathology in AD. 2012. ↩︎
Korvatska O et al. TGFBI in Alzheimer's disease brain and CSF. 2013. ↩︎
Hashimoto Y et al. TGFBI in amyotrophic lateral sclerosis. 2020. ↩︎