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Visual system maldevelopment disrupts extraocular muscle-specific myosin expression

J K Brueckner1, J D Porter

  • 1Department of Anatomy, University of Kentucky Medical Center, Lexington, Kentucky 40536-0084, USA.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|August 4, 1998
PubMed
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Visual cues during a critical developmental period significantly impact extraocular muscle (EOM) phenotype, affecting myosin heavy chain (MHC) expression. This highlights the importance of early visual input for eye muscle development.

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Muscle Physiology

Background:

  • The genetic and epigenetic factors governing extraocular muscle (EOM) phenotype are not well understood.
  • Visual input is hypothesized to play a role in EOM maturation and maintenance.

Purpose of the Study:

  • To investigate the influence of visual cues on EOM maturation.
  • To assess the impact of visual deprivation paradigms on EOM phenotype, specifically myosin heavy chain (MHC) expression.

Main Methods:

  • Rats were subjected to two visual deprivation methods: dark rearing and monocular deprivation.
  • Myosin heavy chain (MHC) isoform expression and mRNA levels were analyzed in EOMs.
  • Phenotypic changes were evaluated in developing and adult EOMs.

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Main Results:

  • Dark rearing during the critical visual period significantly reduced the proportion of EOM fibers expressing fast or slow MHCs.
  • EOM-specific myosin mRNA levels decreased significantly in dark-reared rats during the critical period.
  • Monocular deprivation had minimal effects on MHC isoform expression and no effect on EOM-specific myosin.

Conclusions:

  • There is a critical developmental period where visual activity significantly influences the EOM phenotype.
  • Visual input to the oculomotor system during development modulates EOM-specific MHC expression.
  • Dark rearing during this period alters EOM fiber type composition and myosin expression.