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Myosins are a family of molecular motor proteins, first identified in the skeletal muscles, where they are responsible for muscle contraction. Along with their role in muscle contraction, these proteins also play a role in the intracellular transport of molecules and vesicles. There are twenty-four classes of myosins based on their domain sequence and organization. Of the twenty-four, six classes (Myosin I, Myosin II, Myosin V, Myosin VI, Myosin VII, and Myosin X)  have been well...
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De novo myogenesis, or the formation of muscle fibers, begins during the early embryonic stages. The skeletal muscle is formed from somites– blocks of embryonic cell layers. The somites are further divided into dermatomes, myotomes, sclerotomes, and syndetomes. Among these, the myotomes give rise to muscle fibers.
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Myosins are multimeric motor proteins involved in various cellular processes such as migration, adhesion, and proliferation. Myosin II is the most common type in animal cells, which binds and cross-links actin filaments.
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Actin and myosin or actomyosin filaments also play a significant role in cells other than those involved in muscle contraction (which occurs within the sarcomere of muscle cells). The mechanism of non-muscle cell contractile bundles was first observed in Dictyostelium and Acanthamoeba. In non-muscle cells, two bundles are commonly found: stress fibers and actomyosin adherence belts. These contractile bundles are smaller and less organized than the ones found in muscle cells. They  are held...
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Satellite stem cells or myosatellite cells are quiescent stem cells that Alexander Mauro first identified in 1961. These cells are located between the sarcolemma, the plasma membrane of muscle fibers, and the basal lamina, the connective tissue sheath covering it. These mononucleated cells are activated in response to muscle injury, can transform into myoblasts, and may form or repair muscle fibers. Myosatellite cells can provide additional myonuclei for muscle regeneration or return to a...
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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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Developmental myosins: expression patterns and functional significance.

Stefano Schiaffino1, Alberto C Rossi2, Vika Smerdu3

  • 1Venetian Institute of Molecular Medicine (VIMM), Via G. Orus 2, 35129 Padova, Italy.

Skeletal Muscle
|July 17, 2015
PubMed
Summary
This summary is machine-generated.

Developmental myosins, like embryonic myosin heavy chains (MYH3) and neonatal myosin heavy chains (MYH8), are crucial for fetal development and muscle regeneration. Their unique properties may be adapted for low-load contractions in the prenatal environment.

Keywords:
Distal arthrogryposisEmbryonic myosinMuscle developmentMuscle regenerationMyosin heavy chainNeonatal myosin

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Area of Science:

  • Muscle physiology
  • Developmental biology
  • Molecular genetics

Background:

  • Skeletal muscles express unique myosin isoforms during development, including embryonic (MYH3) and neonatal (MYH8) myosin heavy chains.
  • These developmental myosins are transiently expressed and later replaced by adult isoforms, but persist in specialized adult muscles and during regeneration.
  • Mutations in MYH3 and MYH8 are linked to distal arthrogryposis syndromes, highlighting their role in joint and facial development.

Purpose of the Study:

  • To review the characteristics and functional significance of developmental myosin isoforms in skeletal muscle.
  • To explore the potential adaptations of developmental myosins for the prenatal environment.
  • To underscore the importance of these myosins in muscle development, regeneration, and disease.

Main Methods:

  • Literature review of studies on myosin heavy chain isoforms (MYH3, MYH8) and myosin light chain 4 (MYL4).
  • Analysis of genetic data linking myosin mutations to developmental disorders.
  • Biochemical and biophysical property assessment of developmental myosins.

Main Results:

  • Developmental myosins are re-expressed in regenerating skeletal muscle, serving as a marker for regenerating fibers.
  • Mutations in MYH3 and MYH8 cause congenital joint contractures and orofacial dysmorphisms.
  • The biochemical and biophysical properties of developmental myosins are not fully understood, but they may be specialized for low-load contractions.

Conclusions:

  • Developmental myosins play a critical role in fetal skeletal muscle function, joint development, and facial morphogenesis.
  • Their persistence in specialized adult muscles and during regeneration indicates ongoing functional importance.
  • Further research is needed to fully elucidate the biochemical and biophysical properties and functional significance of these unique myosin isoforms.