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in the adult PNS Fig4 is required to protect myelinated axons from Wallerian degeneration. In the adult CNS, Fig4 is dispensable for fiber stability and nerve conduction, but is required for the timely repair of damaged white matter. The greater vulnerability of the PNS to Fig4 deficiency in the mouse is consistent with clinical observations in patients with Charcot-Marie-Tooth disease.
Neuronal expression of Fig4(C486S) transgene prevents neonatal neurodegeneration & juvenile lethality seen in Fig4-/- mice. However, later in life Fig4(C486S) causes significant abnormalities: hydrocephalus, defective myelination &reduced lifespan
Inactivation of Fig4 in motor neurons display neuronal and axonal degeneration.
Fig4 expression in the neurons is both necessary and sufficient to prevent spongiform neurodegeneration
Haploinsufficiency of Fig4 does not impose risks in rodents to develop neuronal degeneration in either naive or traumatic conditions.
Here we provide strong evidence that Mtmr2 and Fig4 functionally interact in both Schwann cells and neurons, and we reveal for the first time a role of Mtmr2 in neurons in vivo
Fig4 may be required to prevent neurons and glia from excessive lysosomal accumulation after injury and in neurodegeneration.
Pathogenic mechanism of the FIG4 mutation responsible for Charcot-Marie-Tooth disease CMT4J
Results suggest that Fig4 deficiency affects motor neurons differently from sensory neurons by mechanisms involving excessive retention of molecules in lysosomes or disruption of vacuolated organelles.
a novel regulatory mechanism whereby ArPIKfyve enhances Sac3 abundance by attenuating Sac3 proteasome-dependent degradation and suggest that a failure of this mechanism could be the primary molecular defect in the pathogenesis of CMT4J.
shd1 is involved in cell cycle progression, in particular centrosome duplication and a spindle assembly checkpoint function.
The pale tremor mutant provides the first evidence regarding the functional role of mammalian Fig4
Sac3 as an insulin-sensitive phosphatase whose down-regulation increases insulin responsiveness, thus implicating Sac3 as a novel drug target in insulin resistance.
A rare heterozygous FIG4 frameshift variant was identified in a German family. Sequence analysis of FIG4 in 200 ALS cases revealed five rare heterozygous FIG4 missense variants predicted to be deleterious. FIG4 is an ALS risk gene in a central European cohort.
These results suggest that FIG4 binds to hepatitis C virus and modulates particle formation in a cholesteryl ester-related manner.
data identify a novel role of the ArPIKfyve-Sac3 complex in the mechanisms controlling aggregate formation of Sph1 and suggest that Sac3 protein deficiency or overproduction may facilitate aggregation of aggregation-prone proteins
The findings suggest that FIG4 may have a common role in the formation or degradation of neuronal cytoplasmic and nuclear inclusions in several neurodegenerative diseases.
FIG4 mutations were identified in autosomal-dominant Amyotrophic lateral sclerosis.
Phenotypes associated with FIG4 mutations include cortical malformation associated with seizures and psychiatric manifestations, in addition to the Charcot-Marie-Tooth disease type 4J and Yunis-Varon syndrome.
Identified novel biallelic FIG4 mutations.
Genetic variations in the FIG4 gene were not found to cause ALS in Italian patients.
results uncover an unexpected role for Sac3 phosphatase in triple-negative breast cancer cell proliferation
Yunis-Varon syndrome is caused by mutations in FIG4, encoding a phosphoinositide phosphatase.
This study demonistrated that CMT4J is a clinically distinct form of Charcot-Marie-Tooth disease with mutations in the PI(3,5)P phosphatase FIG4.
We identified pathogenic mutations of human FIG4 (KIAA0274) on chromosome 6q21 in four unrelated patients with hereditary motor and sensory neuropathy.
The authors data indicate that the PAS complex is organized to provide optimal PIKfyve functionality and is maintained via ArPIKfyve homomeric and heteromeric interactions.
Heterozygosity for a deleterious allele of FIG4 appears to be a risk factor for ALS and PLS, extending the list of known ALS genes and increasing the clinical spectrum of FIG4-related diseases
PIKfyve-ArPIKfyve-Sac3 core complex: contact sites and their consequence for Sac3 phosphatase activity and endocytic membrane homeostasis
The protein encoded by this gene belongs to the SAC domain-containing protein gene family. The SAC domain, approximately 400 amino acids in length and consisting of seven conserved motifs, has been shown to possess phosphoinositide phosphatase activity. The yeast homolog, Sac1p, is involved in the regulation of various phosphoinositides, and affects diverse cellular functions such as actin cytoskeleton organization, Golgi function, and maintenance of vacuole morphology. Membrane-bound phosphoinositides function as signaling molecules and play a key role in vesicle trafficking in eukaryotic cells. Mutations in this gene have been associated with Charcot-Marie-Tooth disease, type 4J.
SAC domain-containing protein 3
, Sac domain-containing inositol phosphatase 3
, phosphatidylinositol 3,5-bisphosphate 5-phosphatase
, polyphosphoinositide phosphatase
, FIG4 homolog, SAC domain containing lipid phosphatase
, FIG4 homolog, SAC1 domain containing lipid phosphatase