TPM1 (Tropomyosin 1) encodes an actin-binding protein that regulates actin filament organization and stability. While primarily studied in muscle tissue, TPM1 is expressed in neurons and has been implicated in neurodegenerative diseases.
TPM1 (Tropomyosin 1) encodes the alpha-isoform of tropomyosin, a key actin-binding protein that regulates actin filament organization and stability. While primarily studied in muscle tissue where it is essential for sarcomere structure and muscle contraction, TPM1 is also expressed in neurons where it contributes to cytoskeletal organization and has been implicated in neurodegenerative diseases.
| Attribute |
Value |
| Symbol |
TPM1 |
| Full Name |
Tropomyosin 1 |
| Chromosomal Location |
15q22.1 |
| NCBI Gene ID |
7168 |
| OMIM |
191010 |
| Ensembl ID |
ENSG00000140416 |
| UniProt ID |
P09493 |
| Associated Diseases |
Amyotrophic Lateral Sclerosis (ALS), Cardiomyopathy |
TPM1 encodes the alpha-isoform of tropomyosin, a member of the tropomyosin family of actin-binding proteins. Tropomyosins are key regulators of actin filament dynamics and function:
- Actin Binding: TPM1 binds along actin filaments, stabilizing them and regulating interaction with other binding proteins
- Sarcomere Structure: In muscle cells, TPM1 is a core component of the thin filament, essential for muscle contraction
- Cytoskeletal Regulation: TPM1 isoform composition determines which actin-binding proteins can interact with filaments
- Cellular Transport: In non-muscle cells, TPM1 participates in cytoskeletal organization for vesicle and organelle transport
The TPM1 gene produces multiple isoforms through alternative splicing, including skeletal muscle, cardiac muscle, and cytoskeletal isoforms.
TPM1 mutations have been identified in some ALS cases:
- Mutations may affect actin cytoskeletal dynamics in motor neurons
- Altered TPM1 function could disrupt axonal transport and synaptic stability
- The role in cytoskeletal organization is relevant to ALS pathogenesis
- Cardiomyopathy: TPM1 mutations are well-known causes of familial hypertrophic and dilated cardiomyopathy
- Cancer: Altered TPM1 expression has been reported in various cancers
TPM1 exhibits tissue-specific expression:
- Skeletal Muscle: High expression in fast-twitch skeletal muscle fibers
- Heart: Cardiac-specific isoforms are expressed in the myocardium
- Brain: Lower expression in neurons, particularly in the cerebral cortex and hippocampus
- Other Tissues: Expressed in fibroblasts and other cell types
- Barber et al., TPM1 mutations in cardiomyopathy (2009)
- Reid et al., Tropomyosin and ALS pathogenesis (2013)
- Gunning et al., Tropomyosin isoform function (2018)