ClC-2 is a broadly distributed chloride channel with an enigmatic neurophysiological function. In this issue of Neuron, Jeworutzki et al. (2012) use a biochemical approach to identify GlialCAM, a protein with a defined link to leukodystrophy, as a ClC-2 auxiliary subunit.
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http://dx.doi.org/10.1016/j.neuron.2012.02.012 | DOI Listing |
Eur J Med Genet
January 2018
Unitat de Genètica, Departament de Ciències Fisiològiques, Laboratori de Genètica Molecular, IDIBELL-Universitat de Barcelona, L'Hospitalet de Llobregat, Spain; Centro de Investigación en Red de Enfermedades Raras (CIBERER), ISCIII, Spain.
Megalencephalic leukoencephalopathy with subcortical cysts (MLC) is a rare type of leukodystrophy characterized by dysfunction of the role of glial cells in controlling brain fluid and ion homeostasis. Patients affected by MLC present macrocephaly, cysts and white matter vacuolation, which lead to motor and cognitive impairments. To date, there is no treatment for MLC, only supportive care.
View Article and Find Full Text PDFJ Physiol
September 2015
Sección de Fisiología, Departamento de Ciencias Fisiológicas II, University of Barcelona, Barcelona, Spain.
The CLC family of chloride channels and transporters is composed by nine members, but only three of them, ClC-Ka/b, ClC-7 and ClC-2, have been found so far associated with auxiliary subunits. These CLC regulatory subunits are small proteins that present few common characteristics among them, both structurally and functionally, and their effects on the corresponding CLC protein are different. Barttin, a protein with two transmembrane domains, is essential for the membrane localization of ClC-K proteins and their activity in the kidney and inner ear.
View Article and Find Full Text PDFGlialCAM (also named HepaCAM) is a cell adhesion molecule expressed mainly in glial cells from the central nervous system and the liver. GlialCAM plays different roles according to its cellular context. In epithelial cell lines, overexpression of GlialCAM increases cell adhesion and motility but also inhibits cell growth in tumor cell lines, leading to senescence.
View Article and Find Full Text PDFNeurogenetics
March 2014
Sección de Fisiología, Departamento de Ciencias Fisiológicas II, Universidad de Barcelona, Barcelona, Spain.
Megalencephalic leukoencephalopathy with subcortical cysts (MLC) is a heterogeneous neurodegenerative leukodystrophy caused by recessive mutations in MLC1 or GLIALCAM (types MLC1 and MLC2A) of by dominant mutations in GLIALCAM (MLC2B). GlialCAM functions as an auxiliary subunit of both MLC1 and ClC-2 chloride channel, increasing and modifying the function of the latter. Dominant mutations in GLIALCAM cause transient features of MLC but lacks clinical deterioration.
View Article and Find Full Text PDFNeuron
March 2012
Istituto di Biofisica, Consiglio Nazionale delle Ricerche, 16149 Genoa, Italy.
Ion fluxes mediated by glial cells are required for several physiological processes such as fluid homeostasis or the maintenance of low extracellular potassium during high neuronal activity. In mice, the disruption of the Cl(-) channel ClC-2 causes fluid accumulation leading to myelin vacuolation. A similar vacuolation phenotype is detected in humans affected with megalencephalic leukoencephalopathy with subcortical cysts (MLC), a leukodystrophy which is caused by mutations in MLC1 or GLIALCAM.
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