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The Ormdl genes regulate the sphingolipid synthesis pathway to ensure proper myelination and neurologic function in mice
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The Ormdl genes regulate the sphingolipid synthesis pathway to ensure proper myelination and neurologic function in mice
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Journal Article
The Ormdl genes regulate the sphingolipid synthesis pathway to ensure proper myelination and neurologic function in mice
2019
Overview
Sphingolipids are membrane and bioactive lipids that are required for many aspects of normal mammalian development and physiology. However, the importance of the regulatory mechanisms that control sphingolipid levels in these processes is not well understood. The mammalian ORMDL proteins (ORMDL1, 2 and 3) mediate feedback inhibition of the de novo synthesis pathway of sphingolipids by inhibiting serine palmitoyl transferase in response to elevated ceramide levels. To understand the function of ORMDL proteins in vivo, we studied mouse knockouts (KOs) of the Ormdl genes. We found that Ormdl1 and Ormdl3 function redundantly to suppress the levels of bioactive sphingolipid metabolites during myelination of the sciatic nerve. Without proper ORMDL-mediated regulation of sphingolipid synthesis, severe dysmyelination results. Our data indicate that the Ormdls function to restrain sphingolipid metabolism in order to limit levels of dangerous metabolic intermediates that can interfere with essential physiological processes such as myelination.
Publisher
eLife Science Publications, Ltd,eLife Sciences Publications Ltd,eLife Sciences Publications, Ltd
Subject
/ Biochemistry and Chemical Biology
/ Brain
/ Ceramide
/ CRISPR
/ Genes
/ Humans
/ Lipids
/ Mammals
/ Membrane Proteins - genetics
/ Mice
/ Neomycin
/ Proteins
/ Rodents
/ Sciatic Nerve - growth & development
/ Serine
/ Serine C-Palmitoyltransferase - antagonists & inhibitors
/ Serine C-Palmitoyltransferase - genetics
/ Signal Transduction - genetics
