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Published on: July 17, 2018
CLN7 is an organellar chloride channel regulating lysosomal function
Yayu Wang1, Wenping Zeng1, Bingqian Lin1
1Hefei National Laboratory for Physical Sciences at Microscale, the CAS Key Laboratory of Innate Immunity and Chronic Disease, Neurodegenerative Disorder Research Center, School of Basic Medical Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230026, China.
Neuronal ceroid lipofuscinoses (NCLs) are rare genetic disorders. This study identifies CLN7 as a novel chloride channel crucial for lysosomal function, offering potential therapeutic targets for vLINCL.
Area of Science:
- Cell Biology
- Molecular Biology
- Genetics
Background:
- Neuronal ceroid lipofuscinoses (NCLs) are inherited lysosomal storage diseases.
- Variant late-infantile NCL (vLINCL) is linked to mutations in the CLN7 gene, but its function is unknown.
Purpose of the Study:
- To elucidate the function of the CLN7 protein.
- To investigate the role of CLN7 in endolysosomal function and vLINCL pathogenesis.
Main Methods:
- Cloning and expression of human and yeast CLN7.
- Electrophysiological recordings of chloride currents.
- Cellular and biochemical assays to assess endolysosome function.
- Gene knockout studies in model organisms.
Main Results:
- CLN7 identified as a novel endolysosomal chloride channel.
- CLN7 regulates endolysosomal size, chloride conductance, pH, and membrane potential.
- CLN7 facilitates lysosomal calcium release via TRPML1.
- CLN7 knockout recapitulates vLINCL pathology, including retinal degeneration.
Conclusions:
- CLN7 functions as a critical chloride channel in the endolysosomal system.
- Dysfunctional CLN7 impairs lysosomal homeostasis, leading to vLINCL.
- Restoring lysosomal chloride balance is a potential therapeutic strategy for vLINCL.
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