REVIEW: Molecular Mechanisms of Pathologies of Skeletal and Cardiac Muscles Caused by Point Mutations in the Tropomyosin Genes

---

A. M. Matyushenko^1,a* and D. I. Levitsky^1,2,b*

¹Bach Institute of Biochemistry, Federal Research Center on Fundamentals of Biotechnology, Russian Academy of Sciences, 119071 Moscow, Russia

²Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119992 Moscow, Russia

^* To whom correspondence should be addressed.

Received September 28, 2019; Revised October 10, 2019; Accepted October 14, 2019

---

The review is devoted to tropomyosin (Tpm) – actin-binding protein, which plays a crucial role in the regulation of contraction of skeletal and cardiac muscles. Special attention is paid to myopathies and cardiomyopathies – severe hereditary diseases of skeletal and cardiac muscles associated with point mutations in Tpm genes. The current views on the molecular mechanisms of these diseases and the effects of such mutations on the Tpm structure and functions are considered in detail. Besides, some part of the review is devoted to analysis of the properties of Tpm homodimers and heterodimers with myopathic substitutions of amino acid residues in only one of the two chains of the Tpm dimeric molecule.

---

KEY WORDS: tropomyosin, homodimers and heterodimers, regulation of muscle contraction, myopathies and cardiomyopathies, point mutations in tropomyosin genes

DOI: 10.1134/S0006297920140023

---