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Impaired neural development in a zebrafish model for Lowe syndrome
Irene Barinaga-Rementeria Ramirez1, Grzegorz Pietka, David R Jones
1University of Manchester, The Michael Smith Building, Manchester M13 9PT, UK.
Abstract:
Lowe syndrome, which is characterized by defects in the central nervous system, eyes and kidneys, is caused by mutation of the phosphoinositide 5-phosphatase OCRL1. The mechanisms by which loss of OCRL1 leads to the phenotypic manifestations of Lowe syndrome are currently unclear, in part, owing to the lack of an animal model that recapitulates the disease phenotype. Here, we describe a zebrafish model for Lowe syndrome using stable and transient suppression of OCRL1 expression. Deficiency of OCRL1, which is enriched in the brain, leads to neurological defects similar to those reported in Lowe syndrome patients, namely increased susceptibility to heat-induced seizures and cystic brain lesions. In OCRL1-deficient embryos, Akt signalling is reduced and there is both increased apoptosis and reduced proliferation, most strikingly in the neural tissue. Rescue experiments indicate that catalytic activity and binding to the vesicle coat protein clathrin are essential for OCRL1 function in these processes. Our results indicate a novel role for OCRL1 in neural development, and support a model whereby dysregulation of phosphoinositide metabolism and clathrin-mediated membrane traffic leads to the neurological symptoms of Lowe syndrome.
Insights
A new zebrafish model reveals that loss of OCRL1 causes Lowe syndrome neurological defects. This research highlights OCRL1
Area of Science:
- Neuroscience
- Genetics
- Developmental Biology
Background:
- Lowe syndrome involves central nervous system, eye, and kidney defects.
- It stems from mutations in the phosphoinositide 5-phosphatase OCRL1.
- Mechanisms underlying Lowe syndrome pathogenesis remain unclear due to lack of suitable animal models.
Purpose of the Study:
- To develop a zebrafish model for Lowe syndrome.
- To investigate the role of OCRL1 in neurological development.
- To elucidate the molecular mechanisms of Lowe syndrome.
Main Methods:
- Generated a zebrafish model by suppressing OCRL1 expression (stable and transient).
- Assessed neurological defects, including seizures and brain lesions.
- Analyzed Akt signaling, apoptosis, and cell proliferation.
- Performed rescue experiments to confirm OCRL1 function.
Main Results:
- OCRL1 deficiency in zebrafish caused neurological defects mirroring Lowe syndrome, such as seizures and cystic brain lesions.
- Reduced Akt signaling, increased apoptosis, and decreased proliferation were observed in neural tissues of deficient embryos.
- Catalytic activity and clathrin binding are crucial for OCRL1's role in neural development.
Conclusions:
- A zebrafish model effectively recapitulates Lowe syndrome's neurological aspects.
- OCRL1 plays a critical role in neural development.
- Dysregulation of phosphoinositide metabolism and clathrin-mediated membrane traffic contributes to Lowe syndrome's neurological symptoms.
