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The ARSACS disease protein sacsin controls lysosomal positioning and reformation by regulating microtubule dynamics. 2022

Vincent Francis, and Walaa Alshafie, and Rahul Kumar, and Martine Girard, and Bernard Brais, and Peter S McPherson
Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada.

Autosomal recessive spastic ataxia of Charlevoix-Saguenay is a fatal brain disorder featuring cerebellar neurodegeneration leading to spasticity and ataxia. This disease is caused by mutations in the SACS gene that encodes sacsin, a massive 4579-amino acid protein with multiple modular domains. However, molecular details of the function of sacsin are not clear. Here, using live cell imaging and biochemistry, we demonstrate that sacsin binds to microtubules and regulates microtubule dynamics. Loss of sacsin function in various cell types, including knockdown and KO primary neurons and patient fibroblasts, leads to alterations in lysosomal transport, positioning, function, and reformation following autophagy. Each of these phenotypic changes is consistent with altered microtubule dynamics. We further show the effects of sacsin are mediated at least in part through interactions with JIP3, an adapter for microtubule motors. These data reveal a new function for sacsin that explains its previously reported roles and phenotypes.

UI MeSH Term Description Entries
D008247 Lysosomes A class of morphologically heterogeneous cytoplasmic particles in animal and plant tissues characterized by their content of hydrolytic enzymes and the structure-linked latency of these enzymes. The intracellular functions of lysosomes depend on their lytic potential. The single unit membrane of the lysosome acts as a barrier between the enzymes enclosed in the lysosome and the external substrate. The activity of the enzymes contained in lysosomes is limited or nil unless the vesicle in which they are enclosed is ruptured or undergoes MEMBRANE FUSION. (From Rieger et al., Glossary of Genetics: Classical and Molecular, 5th ed). Autolysosome,Autolysosomes,Lysosome
D008870 Microtubules Slender, cylindrical filaments found in the cytoskeleton of plant and animal cells. They are composed of the protein TUBULIN and are influenced by TUBULIN MODULATORS. Microtubule
D009128 Muscle Spasticity A form of muscle hypertonia associated with upper MOTOR NEURON DISEASE. Resistance to passive stretch of a spastic muscle results in minimal initial resistance (a "free interval") followed by an incremental increase in muscle tone. Tone increases in proportion to the velocity of stretch. Spasticity is usually accompanied by HYPERREFLEXIA and variable degrees of MUSCLE WEAKNESS. (From Adams et al., Principles of Neurology, 6th ed, p54) Clasp-Knife Spasticity,Spastic,Clasp Knife Spasticity,Spasticity, Clasp-Knife,Spasticity, Muscle
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
D006360 Heat-Shock Proteins Proteins which are synthesized in eukaryotic organisms and bacteria in response to hyperthermia and other environmental stresses. They increase thermal tolerance and perform functions essential to cell survival under these conditions. Stress Protein,Stress Proteins,Heat-Shock Protein,Heat Shock Protein,Heat Shock Proteins,Protein, Stress
D000595 Amino Acid Sequence The order of amino acids as they occur in a polypeptide chain. This is referred to as the primary structure of proteins. It is of fundamental importance in determining PROTEIN CONFORMATION. Protein Structure, Primary,Amino Acid Sequences,Sequence, Amino Acid,Sequences, Amino Acid,Primary Protein Structure,Primary Protein Structures,Protein Structures, Primary,Structure, Primary Protein,Structures, Primary Protein
D020754 Spinocerebellar Ataxias A group of predominately late-onset, cerebellar ataxias which have been divided into multiple subtypes based on clinical features and genetic mapping. Progressive ataxia is a central feature of these conditions, and in certain subtypes POLYNEUROPATHY; DYSARTHRIA; visual loss; and other disorders may develop. (From Joynt, Clinical Neurology, 1997, Ch65, pp 12-17; J Neuropathol Exp Neurol 1998 Jun;57(6):531-43) Spinocerebellar Ataxia Type 1,Spinocerebellar Ataxia Type 2,Spinocerebellar Ataxia Type 4,Spinocerebellar Ataxia Type 5,Spinocerebellar Ataxia Type 6,Spinocerebellar Ataxia Type 7,Spinocerebellar Atrophies,Autosomal Dominant Cerebellar Ataxia, Type II,Cerebellar Degeneration with Slow Eye Movements,Cerebelloparenchymal Disorder I,Dominantly-Inherited Spinocerebellar Ataxias,Menzel Type OPCA,OPCA with Macular Degeneration and External Ophthalmoplegia,OPCA with Retinal Degeneration,Olivopontocerebellar Atrophy 2,Olivopontocerebellar Atrophy I,Olivopontocerebellar Atrophy II,Olivopontocerebellar Atrophy III,Olivopontocerebellar Atrophy IV,Olivopontocerebellar Atrophy, Holguin Type,SCA1,Schut-Haymaker Type OPCA,Spinocerebellar Ataxia 1,Spinocerebellar Ataxia 2,Spinocerebellar Ataxia 4,Spinocerebellar Ataxia 5,Spinocerebellar Ataxia 6,Spinocerebellar Ataxia 7,Spinocerebellar Ataxia with Slow Eye Movements,Spinocerebellar Ataxia, Autosomal Dominant, with Sensory Axonal Neuropathy,Spinocerebellar Ataxia, Cuban Type,Spinocerebellar Ataxia-1,Spinocerebellar Ataxia-2,Spinocerebellar Ataxia-4,Spinocerebellar Ataxia-5,Spinocerebellar Ataxia-6,Spinocerebellar Ataxia-7,Spinocerebellar Ataxias, Dominantly-Inherited,Spinocerebellar Atrophy 2,Spinocerebellar Atrophy I,Spinocerebellar Atrophy II,Spinocerebellar Degeneration with Slow Eye Movements,Type 1 Spinocerebellar Ataxia,Type 2 Spinocerebellar Ataxia,Type 4 Spinocerebellar Ataxia,Type 5 Spinocerebellar Ataxia,Type 6 Spinocerebellar Ataxia,Type 7 Spinocerebellar Ataxia,Wadia Swami Syndrome,Wadia-Swami Syndrome,Ataxia 1, Spinocerebellar,Ataxia 2, Spinocerebellar,Ataxia 4, Spinocerebellar,Ataxia 5, Spinocerebellar,Ataxia 6, Spinocerebellar,Ataxia 7, Spinocerebellar,Ataxia, Dominantly-Inherited Spinocerebellar,Ataxia, Spinocerebellar,Ataxias, Dominantly-Inherited Spinocerebellar,Ataxias, Spinocerebellar,Atrophies, Spinocerebellar,Atrophy 2, Olivopontocerebellar,Atrophy 2, Spinocerebellar,Atrophy 2s, Olivopontocerebellar,Atrophy 2s, Spinocerebellar,Atrophy I, Olivopontocerebellar,Atrophy I, Spinocerebellar,Atrophy II, Olivopontocerebellar,Atrophy III, Olivopontocerebellar,Atrophy IIs, Spinocerebellar,Atrophy IV, Olivopontocerebellar,Atrophy IVs, Olivopontocerebellar,Atrophy, Spinocerebellar,Cerebelloparenchymal Disorder Is,Dominantly Inherited Spinocerebellar Ataxias,Dominantly-Inherited Spinocerebellar Ataxia,OPCA, Menzel Type,OPCA, Schut-Haymaker Type,Olivopontocerebellar Atrophy 2s,Olivopontocerebellar Atrophy IIIs,Olivopontocerebellar Atrophy IIs,Olivopontocerebellar Atrophy IVs,Olivopontocerebellar Atrophy Is,SCA1s,Schut Haymaker Type OPCA,Spinocerebellar Ataxia,Spinocerebellar Ataxia 1s,Spinocerebellar Ataxia 2s,Spinocerebellar Ataxia 4s,Spinocerebellar Ataxia 5s,Spinocerebellar Ataxia 6s,Spinocerebellar Ataxia 7s,Spinocerebellar Ataxia, Dominantly-Inherited,Spinocerebellar Ataxias, Dominantly Inherited,Spinocerebellar Atrophy,Spinocerebellar Atrophy 2s,Spinocerebellar Atrophy IIs,Spinocerebellar Atrophy Is,Swami Syndrome, Wadia,Syndrome, Wadia Swami,Syndrome, Wadia-Swami

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