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Related Experiment Videos

Myelin membrane structure and composition correlated: a phylogenetic study.

D A Kirschner1, H Inouye, A L Ganser

  • 1Children's Hospital, Boston, MA 02115.

Journal of Neurochemistry
|November 1, 1989
PubMed
Summary

Myelin structure varies across species, with protein composition (P0 vs. proteolipid protein) influencing membrane spacing. These changes reflect evolutionary adaptations in the central and peripheral nervous systems.

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Evolutionary Biology

Background:

  • Myelin, a crucial insulating sheath in the nervous system, exhibits structural and biochemical diversity across species.
  • Understanding the relationship between myelin composition and structure provides insights into nervous system evolution and function.

Purpose of the Study:

  • To correlate myelin membrane structure with biochemical composition across a phylogenetic spectrum of animals.
  • To identify conserved and altered features of myelin structure during evolutionary development.

Main Methods:

  • X-ray diffraction of unfixed nervous tissue to measure membrane bilayer thickness and inter-membrane spacing.
  • Thin-layer chromatography (TLC) for lipid composition analysis.
  • Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and immunoblotting for protein analysis, including myelin P0 glycoprotein, proteolipid protein (PLP), and myelin P2 basic protein.

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Main Results:

  • Lipid composition varied significantly without clear phylogenetic trends and did not affect bilayer thickness or membrane separation.
  • Extracellular space width correlated with the presence of P0 glycoprotein (wide spaces) or PLP (narrow spaces).
  • Cytoplasmic space varied, being narrower in PLP-containing myelin and even narrower when P0 and basic protein were co-detected.

Conclusions:

  • Myelin structure, particularly inter-membrane spacing, is significantly influenced by protein composition (P0 vs. PLP).
  • Specific structural adaptations in myelin correlate with the presence of key myelin proteins, reflecting evolutionary changes.
  • These findings elucidate how myelin structure has adapted during evolution in response to compositional shifts.