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Differences in gene expression between strabismic and normal human extraocular muscles.

Amy L Altick1, Cheng-Yuan Feng, Karen Schlauch

  • 1Department of Physiology & Cell Biology, University of Nevada School of Medicine, Reno, NV 89557, USA.

Investigative Ophthalmology & Visual Science
|July 13, 2012
PubMed
Summary
This summary is machine-generated.

Gene expression in strabismic extraocular muscles (EOMs) differs from normal EOMs. Upregulated extracellular matrix genes and downregulated contractility genes suggest structural imbalances in strabismus.

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Area of Science:

  • Ophthalmology
  • Molecular Biology
  • Genetics

Background:

  • Strabismic extraocular muscles (EOMs) exhibit distinct structural and functional characteristics compared to normal EOMs.
  • The specific gene expression profiles underlying these differences in human strabismic EOMs remain largely uncharacterized.

Purpose of the Study:

  • To investigate and compare the gene expression profiles of human EOMs from individuals with strabismus and healthy controls.
  • To identify genes with differential expression that may contribute to the understanding of strabismus pathogenesis and its effects.

Main Methods:

  • EOM samples were collected from patients undergoing corrective surgery for horizontal strabismus and from organ donors with normal EOMs.
  • Microarray analysis and quantitative PCR were employed to identify significantly up- and down-regulated genes.
  • Analysis focused on probe sets with >3-fold differential expression and an adjusted P-value ≤ 0.05.

Main Results:

  • Microarray analysis revealed 604 genes with significantly altered expression in strabismic EOMs.
  • Genes involved in extracellular matrix structure were predominantly upregulated, while genes related to contractility were downregulated.
  • Significant differences were also observed in genes associated with signaling, calcium handling, mitochondrial function, and energy homeostasis. A skeletal muscle PCR array identified 22 muscle-specific genes downregulated in strabismic EOMs.

Conclusions:

  • Gene expression differences in strabismic EOMs highlight the peripheral oculomotor system's role in the condition.
  • Increased expression of extracellular matrix genes and decreased expression of contractility genes suggest structural imbalances in EOMs.
  • Altered gene regulation of contractile and extracellular matrix proteins is implicated in strabismus pathogenesis or consequences, indicating potential therapeutic targets.