Phenotypic differences between peripheral myelin protein-22 (PMP22) and myelin protein zero (P0) mutations associated with Charcot-Marie-Tooth-related diseases. 2003

Igor Shames, and Andrew Fraser, and Joshua Colby, and Wayel Orfali, and G Jackson Snipes
Department of Neurology and Neurosurgery, McGill University, Montreal, Canada.

Mutations in the genes for peripheral myelin protein-22 (PMP22) and myelin protein zero (P0) cause human hereditary neuropathies with varying clinical and pathological phenotypes. In this study, we examine the effects of representative disease-causing mutations on the subcellular distribution of their corresponding PMP22- and P0-enhanced green fluorescent protein (EGFP) fusion proteins. In transiently transfected HeLa and 293 cells, we find that wild-type P0-EGFP and PMP22-EGFP are efficiently synthesized and transported through the secretory pathway to the plasma membrane. The P0-EGFP and PMP22-EGFP mutants can be classified into several groups: those that are transported to the plasma membrane as in the majority of P0 mutants; those that are retained in the endoplasmic reticulum as in the majority of PMP22 mutants; and those that are a mixture of the two. In addition, several of these disease-causing mutations are associated with the development of abnormal intracellular cytoplasmic structures that we have previously identified as either intracellular myelin figures or aggresomes. Our studies indicate that different types of PMP22 and P0 mutations are associated with specific intracellular chaperone proteins, including calnexin and BiP, and that these associations can be altered by glycosylation. These findings indicate that the various P0 and PMP22 mutants may exert their pathogenic effects in different subcellular compartments and by different mechanisms in the mammalian cell.

UI MeSH Term Description Entries
D009154 Mutation Any detectable and heritable change in the genetic material that causes a change in the GENOTYPE and which is transmitted to daughter cells and to succeeding generations. Mutations
D009185 Myelin Proteins MYELIN-specific proteins that play a structural or regulatory role in the genesis and maintenance of the lamellar MYELIN SHEATH structure. Myelin Protein,Protein, Myelin,Proteins, Myelin
D009186 Myelin Sheath The lipid-rich sheath surrounding AXONS in both the CENTRAL NERVOUS SYSTEMS and PERIPHERAL NERVOUS SYSTEM. The myelin sheath is an electrical insulator and allows faster and more energetically efficient conduction of impulses. The sheath is formed by the cell membranes of glial cells (SCHWANN CELLS in the peripheral and OLIGODENDROGLIA in the central nervous system). Deterioration of the sheath in DEMYELINATING DISEASES is a serious clinical problem. Myelin,Myelin Sheaths,Sheath, Myelin,Sheaths, Myelin
D010525 Peripheral Nerves The nerves outside of the brain and spinal cord, including the autonomic, cranial, and spinal nerves. Peripheral nerves contain non-neuronal cells and connective tissue as well as axons. The connective tissue layers include, from the outside to the inside, the epineurium, the perineurium, and the endoneurium. Endoneurium,Epineurium,Perineurium,Endoneuriums,Epineuriums,Nerve, Peripheral,Nerves, Peripheral,Perineuriums,Peripheral Nerve
D010641 Phenotype The outward appearance of the individual. It is the product of interactions between genes, and between the GENOTYPE and the environment. Phenotypes
D011993 Recombinant Fusion Proteins Recombinant proteins produced by the GENETIC TRANSLATION of fused genes formed by the combination of NUCLEIC ACID REGULATORY SEQUENCES of one or more genes with the protein coding sequences of one or more genes. Fusion Proteins, Recombinant,Recombinant Chimeric Protein,Recombinant Fusion Protein,Recombinant Hybrid Protein,Chimeric Proteins, Recombinant,Hybrid Proteins, Recombinant,Recombinant Chimeric Proteins,Recombinant Hybrid Proteins,Chimeric Protein, Recombinant,Fusion Protein, Recombinant,Hybrid Protein, Recombinant,Protein, Recombinant Chimeric,Protein, Recombinant Fusion,Protein, Recombinant Hybrid,Proteins, Recombinant Chimeric,Proteins, Recombinant Fusion,Proteins, Recombinant Hybrid
D002451 Cell Compartmentation A partitioning within cells due to the selectively permeable membranes which enclose each of the separate parts, e.g., mitochondria, lysosomes, etc. Cell Compartmentations,Compartmentation, Cell,Compartmentations, Cell
D002462 Cell Membrane The lipid- and protein-containing, selectively permeable membrane that surrounds the cytoplasm in prokaryotic and eukaryotic cells. Plasma Membrane,Cytoplasmic Membrane,Cell Membranes,Cytoplasmic Membranes,Membrane, Cell,Membrane, Cytoplasmic,Membrane, Plasma,Membranes, Cell,Membranes, Cytoplasmic,Membranes, Plasma,Plasma Membranes
D002607 Charcot-Marie-Tooth Disease A hereditary motor and sensory neuropathy transmitted most often as an autosomal dominant trait and characterized by progressive distal wasting and loss of reflexes in the muscles of the legs (and occasionally involving the arms). Onset is usually in the second to fourth decade of life. This condition has been divided into two subtypes, hereditary motor and sensory neuropathy (HMSN) types I and II. HMSN I is associated with abnormal nerve conduction velocities and nerve hypertrophy, features not seen in HMSN II. (Adams et al., Principles of Neurology, 6th ed, p1343) Atrophy, Muscular, Peroneal,HMSN Type I,HMSN Type II,Hereditary Motor and Sensory-Neuropathy Type II,Hereditary Motor, and Sensory Neuropathy Type I,Muscular Atrophy, Peroneal,Peroneal Muscular Atrophy,Roussy-Levy Syndrome,Charcot-Marie Disease,Charcot-Marie-Tooth Disease, Autosomal Dominant, With Focally Folded Myelin Sheaths, Type 1A,Charcot-Marie-Tooth Disease, Autosomal Dominant, with Focally Folded Myelin Sheaths, Type 1B,Charcot-Marie-Tooth Disease, Demyelinating, Type 1A,Charcot-Marie-Tooth Disease, Demyelinating, Type 1B,Charcot-Marie-Tooth Disease, Slow Nerve Conduction Type, Linked To Duffy,Charcot-Marie-Tooth Disease, Type 1A,Charcot-Marie-Tooth Disease, Type 1B,Charcot-Marie-Tooth Disease, Type I,Charcot-Marie-Tooth Disease, Type IA,Charcot-Marie-Tooth Disease, Type IB,Charcot-Marie-Tooth Disease, Type II,Charcot-Marie-Tooth Hereditary Neuropathy,Charcot-Marie-Tooth Neuropathy, Type 1A,Charcot-Marie-Tooth Neuropathy, Type 1B,Charcot-Marie-Tooth Syndrome,HMN Distal Type I,HMSN 1A,HMSN 1B,HMSN I,HMSN IA,HMSN IB,HMSN II,HMSN1A,HMSN1B,Hereditary Areflexic Dystasia,Hereditary Motor And Sensory Neuropathy IB,Hereditary Motor and Sensory Neuropathy 1A,Hereditary Motor and Sensory Neuropathy 1B,Hereditary Motor and Sensory Neuropathy IA,Hereditary Type I Motor and Sensory Neuropathy,Neuropathy, Type I Hereditary Motor and Sensory,Neuropathy, Type II Hereditary Motor and Sensory,Roussy Levy Hereditary Areflexic Dystasia,Roussy-Levy Disease,Roussy-Levy Hereditary Areflexic Dystasia,Areflexic Dystasia, Hereditary,Areflexic Dystasias, Hereditary,Atrophies, Peroneal Muscular,Atrophy, Peroneal Muscular,Charcot Marie Disease,Charcot Marie Tooth Disease,Charcot Marie Tooth Disease, Type 1A,Charcot Marie Tooth Disease, Type 1B,Charcot Marie Tooth Disease, Type I,Charcot Marie Tooth Disease, Type IA,Charcot Marie Tooth Disease, Type IB,Charcot Marie Tooth Disease, Type II,Charcot Marie Tooth Hereditary Neuropathy,Charcot Marie Tooth Neuropathy, Type 1A,Charcot Marie Tooth Neuropathy, Type 1B,Charcot Marie Tooth Syndrome,Dystasia, Hereditary Areflexic,Dystasias, Hereditary Areflexic,Hereditary Areflexic Dystasias,Hereditary Motor and Sensory Neuropathy Type II,Hereditary Neuropathy, Charcot-Marie-Tooth,Muscular Atrophies, Peroneal,Peroneal Muscular Atrophies,Roussy Levy Disease,Roussy Levy Syndrome,Syndrome, Charcot-Marie-Tooth,Syndrome, Roussy-Levy
D004721 Endoplasmic Reticulum A system of cisternae in the CYTOPLASM of many cells. In places the endoplasmic reticulum is continuous with the plasma membrane (CELL MEMBRANE) or outer membrane of the nuclear envelope. If the outer surfaces of the endoplasmic reticulum membranes are coated with ribosomes, the endoplasmic reticulum is said to be rough-surfaced (ENDOPLASMIC RETICULUM, ROUGH); otherwise it is said to be smooth-surfaced (ENDOPLASMIC RETICULUM, SMOOTH). (King & Stansfield, A Dictionary of Genetics, 4th ed) Ergastoplasm,Reticulum, Endoplasmic

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