Upregulation of large myelin protein zero leads to Charcot–Marie–Tooth disease-like neuropathy in mice
Copyright policy )Upregulation of large myelin protein zero leads to Charcot–Marie–Tooth disease-like neuropathy in mice
AbstractCharcot–Marie–Tooth (CMT) disease is a hereditary neuropathy mainly caused by gene mutation of peripheral myelin proteins including myelin protein zero (P0, MPZ). Large myelin protein zero (L-MPZ) is an isoform of P0 that contains an extended polypeptide synthesized by translational readthrough at the C-terminus in tetrapods, including humans. The physiological role of L-MPZ and consequences of an altered L-MPZ/P0 ratio in peripheral myelin are not known. To clarify this, we used genome editing to generate a mouse line (L-MPZ mice) that produced L-MPZ instead of P0. Motor tests and electrophysiological, immunohistological, and electron microscopy analyses show that homozygous L-MPZ mice exhibit CMT-like phenotypes including thin and/or loose myelin, increased small-caliber axons, and disorganized axo–glial interactions. Heterozygous mice show a milder phenotype. These results highlight the importance of an appropriate L-MPZ/P0 ratio and show that aberrant readthrough of a myelin protein causes neuropathy.
Gene Editing, Heterozygote, Homozygote, Mice, Transgenic, Motor Activity, Endoplasmic Reticulum Stress, Article, Axons, Up-Regulation, Mice, Inbred C57BL, Disease Models, Animal, Mice, Phenotype, Charcot-Marie-Tooth Disease, Mutation, Animals, Protein Isoforms, Myelin P0 Protein, Myelin Sheath
Gene Editing, Heterozygote, Homozygote, Mice, Transgenic, Motor Activity, Endoplasmic Reticulum Stress, Article, Axons, Up-Regulation, Mice, Inbred C57BL, Disease Models, Animal, Mice, Phenotype, Charcot-Marie-Tooth Disease, Mutation, Animals, Protein Isoforms, Myelin P0 Protein, Myelin Sheath
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