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Ceroid-lipofuscinosis neuronal 8 protein (Cln8) knockout strain, which bears an early frameshift mutation in Cln8 that causes CLN8 protein deficiency and features resembling those seen in Batten disease.
This study demonistrated that Selective spatiotemporal patterns of glial activation and neuron loss in the sensory thalamocortical pathways in neuronal ceroid lipofuscinosis 8 decifiency mice.
The amount of myelin was reduced in 1-month-old Cln8(mnd) mice, but reached normal levels by 5 months of age. The level of Cln8 gene expression followed the developmental pattern of myelin formation and was high in primary oligodendrocytes.
This study demonistrated that the changes in glutamate receptor expression in the hippocampus of the mnd mouse.
Mutations in mouse CLN8 gene show marked deficiency of mitochondrial Ca2+ clearance in Cln8mnd neurons, and the heightened vulnerability of these neurons to excitotoxic effects of glutamate.
The mnd mouse mutation in CLN8 leads to progressive behavioral abnormalities prior to the onset of gross motor symptoms, linking the mutation via pathology to a quantifiable behavioral phenotype.
A marked increase in astroglial and microglial cells, and in TNF receptor TNFR-I immunoreactivity was observed in the spinal cord of motor neuron degeneration mutation (mnd) mice at the age of 4 month.
Mutations in the CLN8 gene underlie Northern epilepsy and a subset of Turkish variant late infantile NCL. Inducing disease mutations in a mouse hippocampal neuronal cell line did not affect localization of CLN8.
Expression of Cln8 in the developing and mature brain suggests roles for Cln8 in maturation, differentiation and supporting the survival of different neuronal populations.
CLN8 recruits lysosomal soluble proteins in the endoplasmic reticulum (ER), delivers them to the Golgi apparatus via COPII-coated vesicles, and recycles back to the ER via COPI-coated vesicles. CLN8 interacts with the lysosomal soluble proteins through its large luminal loop. The export signal of CLN8 (261VDWNF265) is localized in its cytosolic C-terminus. CLN8 deficiency results in depletion of enzymes at the lysosome.
Whole-exome sequencing and homozygosity mapping revealed a novel homozygous CLN8 mutation, c.677T>C (p.Leu226Pro in 5 relatives from a large Turkish consanguineous family
Novel missense mutation in CLN8 in late infantile neuronal ceroid lipofuscinosis
This study does not support a contribution of rare missense CLN8 variations to ASD susceptibility in the Japanese population.
This study highlights a close interaction between CLN5/CLN8 proteins, and their role in sphingolipid metabolism. Our findings suggest that CLN5p/CLN8p most likely are positive modulators of CerS1 and/or CerS2.
A missense mutation at the CLN8 gene (763C>G)has been identified in 3 consanguineous Israeli-Arab patients. The phenotype in 2 of them is milder than that of their cousin who has typical neuronal ceroid lipofuscinosis.
CLN8 is a candidate modifier gene for GD1. Increased expression may protect against severe GD1.It may function as a protective sphingolipid sensor and/or in glycosphingolipid trafficking.
a novel, large CLN8 gene deletion c.544-2566_590del2613 in a Turkish family with a slightly more severe phenotype of neuronal ceroid lipofuscinose was described.
patients with CLN8 mutations from Italy. In these patients, the onset of epilepsy occurred between 3 and 6 years of age, with myoclonic, tonic-clonic, and atypical absence seizures. Electroencephalograms revealed focal and/or generalized abnormalities.
CLN8 plays a role in cell proliferation during neuronal differentiation and in protection against cell death.
This gene encodes a transmembrane protein belonging to a family of proteins containing TLC domains, which are postulated to function in lipid synthesis, transport, or sensing. The protein localizes to the endoplasmic reticulum (ER), and may recycle between the ER and ER-Golgi intermediate compartment. Mutations in this gene are associated with progressive epilepsy with mental retardation (EMPR), which is a subtype of neuronal ceroid lipofuscinoses (NCL). Patients with mutations in this gene have altered levels of sphingolipid and phospholipids in the brain.
ceroid-lipofuscinosis, neuronal 8 (epilepsy, progressive with mental retardation)
, protein CLN8
, motor neuron degeneration