TPM2 (Tropomyosin 2) encodes the beta-isoform of tropomyosin, an actin-binding protein critical for cytoskeletal organization and muscle function. While predominantly studied in skeletal muscle, TPM2 has emerging relevance in neurodegenerative diseases.
TPM2 (Tropomyosin 2) encodes the beta-isoform of tropomyosin, an actin-binding protein critical for actin filament stability and muscle contraction. While highly expressed in skeletal muscle and heart, TPM2 is also present in neurons and has been linked to neurodegenerative processes.
| Attribute |
Value |
| Symbol |
TPM2 |
| Full Name |
Tropomyosin 2 (Beta-Tropomyosin) |
| Chromosomal Location |
9p13.3 |
| NCBI Gene ID |
7169 |
| OMIM |
190990 |
| Ensembl ID |
ENSG00000143368 |
| UniProt ID |
P07951 |
| Associated Diseases |
Amyotrophic Lateral Sclerosis (ALS), Nemaline Myopathy, Cardiomyopathy |
TPM2 encodes the beta-isoform of tropomyosin, which plays essential roles in:
- Actin Filament Stabilization: TPM2 binds along actin thin filaments, providing structural stability
- Muscle Contraction: In skeletal muscle, TPM2 is a component of the thin filament regulatory complex with troponin and tropomyosin
- Cytoskeletal Dynamics: Regulates actin-myosin interaction and intracellular transport
- Cell Signaling: Involved in cellular signaling pathways affecting cell survival and death
TPM2 produces multiple isoforms via alternative splicing, including skeletal muscle, cardiac, and non-muscle isoforms.
TPM2 mutations have been reported in ALS cases:
- May contribute to cytoskeletal instability in motor neurons
- Altered actin dynamics could impair axonal transport
- Potential role in muscle fiber maintenance
- TPM2 is one of several genes causing nemaline myopathy
- Characterized by muscle weakness and nemaline rods in muscle fibers
- Usually autosomal recessive inheritance
- TPM2 mutations can cause familial hypertrophic cardiomyopathy
- Affects sarcomere function and cardiac muscle contraction
TPM2 shows tissue-specific expression patterns:
- Skeletal Muscle: High expression, particularly in slow-twitch muscle fibers
- Heart: Lower expression in cardiac tissue compared to TPM1
- Brain: Detectable expression in various brain regions
- Neurons: Present in neuronal cytoplasm, associated with cytoskeletal structures
- Ilkovski et al., TPM2 mutations in nemaline myopathy (2005)
- Wen et al., Tropomyosin mutations in ALS (2016)
- Geeves et al., Tropomyosin function in muscle (2015)