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- W2034128221 abstract "We report the X-ray scattering study of sciatic and optic nerve myelin from shiverer, jimpy and quaking mice mutants and from the corresponding controls. These three mutations are known to affect dramatically central nervous system (CNS) myelin and to induce comparatively minor alterations in peripheral nervous system (PNS) myelin. Scattering experiments and data reduction were carried out using the techniques and algorithms developed in our laboratory and previously applied to several problems involving the structure of myelin. In sciatic nerve the fraction of myelin elementary pairs of membranes (total myelin) decreases in shiverer and quaking nerves (by approximately 30%) but not in jimpy nerves; in all three mutants the fraction of myelin membrane pairs that are not regularly stacked in the sheaths (loose myelin), the average number of membranes per sheath and the packing disorder are the same as in the control nerves; the repeat distance D and the membrane distance Dcyt across the cytoplasmic space increase in shiverer and decrease in jimpy; in quaking, D also decreases and the decrease is smaller than in jimpy and is not specific for Dcyt; small changes are also observed in the electron density profiles. As for the optic nerve the myelin content decreases dramatically in the three mutants; the very weak signal attests to a tiny amount of pairs of membranes structurally similar to normal CNS myelin. It is surprising that the structure of CNS myelin should be almost normal in the absence of the major structural components, namely myelin basic protein (MBP) for shiverer of proteolipid protein (PLP) for jimpy. The question arises whether the composition of the residual pairs of membranes, operationally identified as myelin in the X-ray scattering experiments, mirrors the composition determined by chemical means on the fraction of nerve tissue histologically identified as myelin, or whether in all circumstances it remains approximately the same." @default.
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- W2034128221 date "1996-02-01" @default.
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- W2034128221 title "Order – Disorder Phenomena in Myelinated Nerve Sheaths. VI.The Effects ofquaking,jimpyandshivererMutations: An X-ray Scattering Study of Mouse Sciatic and Optic Nerves" @default.
- W2034128221 doi "https://doi.org/10.1006/jmbi.1996.0088" @default.
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