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Published on: August 24, 2013
Targeting autophagy impairment improves the phenotype of a novel CLN8 zebrafish model
Maria Marchese1, Sara Bernardi2, Asahi Ogi1
1Department of Neurobiology and Molecular Medicine, IRCCS Fondazione Stella Maris, Calambrone, Pisa, Italy.
Abstract:
CLN8 is an endoplasmic reticulum cargo receptor and a regulator of lysosome biogenesis whose loss of function leads to neuronal ceroid lipofuscinosis. CLN8 has been linked to autophagy and lipid metabolism, but much remains to be learned, and there are no therapies acting on the molecular signatures in this disorder. The present study aims to characterize the molecular pathways involved in CLN8 disease and, by pinpointing altered ones, to identify potential therapies. To bridge the gap between cell and mammalian models, we generated a new zebrafish model of CLN8 deficiency, which recapitulates the pathological features of the disease. We observed, for the first time, that CLN8 dysfunction impairs autophagy. Using autophagy modulators, we showed that trehalose and SG2 are able to attenuate the pathological phenotype in mutant larvae, confirming autophagy impairment as a secondary event in disease progression. Overall, our successful modeling of CLN8 defects in zebrafish highlights this novel in vivo model's strong potential as an instrument for exploring the role of CLN8 dysfunction in cellular pathways, with a view to identifying small molecules to treat this rare disease.
Insights
Loss of CLN8 protein impairs autophagy, a key cellular process. Researchers developed a zebrafish model to identify trehalose and SG2 as potential treatments for CLN8-related diseases.
Area of Science:
- Cell Biology
- Neuroscience
- Genetics
Background:
- CLN8 protein functions as an endoplasmic reticulum cargo receptor and regulates lysosome biogenesis.
- Loss of CLN8 function is associated with neuronal ceroid lipofuscinosis, a rare genetic disorder.
- Existing knowledge on CLN8's role in autophagy and lipid metabolism is limited, with no targeted therapies available.
Purpose of the Study:
- To characterize molecular pathways implicated in CLN8 deficiency.
- To identify potential therapeutic strategies by pinpointing altered pathways.
- To develop and validate a novel zebrafish model for studying CLN8-related diseases.
Main Methods:
- Generation of a zebrafish model for CLN8 deficiency.
- Assessment of pathological features in mutant zebrafish larvae.
- Utilisation of autophagy modulators (trehalose and SG2) to test therapeutic potential.
Main Results:
- The zebrafish model successfully recapitulated key pathological features of CLN8 deficiency.
- CLN8 dysfunction was demonstrated to impair autophagy, a novel finding.
- Trehalose and SG2 treatment significantly attenuated the pathological phenotype in mutant larvae.
- Autophagy impairment was confirmed as a secondary event in the disease progression.
Conclusions:
- The novel zebrafish model is a valuable tool for investigating CLN8 dysfunction.
- Autophagy modulation presents a promising therapeutic avenue for CLN8-related disorders.
- This study paves the way for identifying small molecules to treat rare diseases linked to CLN8.
