Motor and Sensory Deficits in the teetering Mice Result from Mutation of the ESCRT Component HGS.

Publisher: Public Library of Science Country of Publication: United States NLM ID: 101239074 Publication Model: eCollection Cited Medium: Internet ISSN: 1553-7404 (Electronic) Linking ISSN: 15537390 NLM ISO Abbreviation: PLoS Genet Subsets: MEDLINE

Original Publication: San Francisco, CA : Public Library of Science, c2005-

Gene Expression Regulation, Developmental* ; Mutation*; Endosomal Sorting Complexes Required for Transport/*genetics ; Phosphoproteins/*genetics; Amino Acid Sequence ; Animals ; Behavior, Animal/physiology ; Endosomal Sorting Complexes Required for Transport/metabolism ; Female ; Hippocampus/pathology ; Male ; Mice, Inbred C57BL ; Mice, Mutant Strains ; Molecular Sequence Data ; Motor Activity/genetics ; Myelin Sheath/genetics ; Myelin Sheath/metabolism ; Neuromuscular Junction/genetics ; Neuromuscular Junction/physiopathology ; Phosphoproteins/metabolism ; Sciatic Nerve/metabolism ; Sciatic Nerve/physiopathology ; Synaptic Transmission/genetics

Neurons are particularly vulnerable to perturbations in endo-lysosomal transport, as several neurological disorders are caused by a primary deficit in this pathway. In this report, we used positional cloning to show that the spontaneously occurring neurological mutation teetering (tn) is a single nucleotide substitution in hepatocyte growth factor-regulated tyrosine kinase substrate (Hgs/Hrs), a component of the endosomal sorting complex required for transport (ESCRT). The tn mice exhibit hypokenesis, muscle weakness, reduced muscle size and early perinatal lethality by 5-weeks of age. Although HGS has been suggested to be essential for the sorting of ubiquitinated membrane proteins to the lysosome, there were no alterations in receptor tyrosine kinase levels in the central nervous system, and only a modest decrease in tropomyosin receptor kinase B (TrkB) in the sciatic nerves of the tn mice. Instead, loss of HGS resulted in structural alterations at the neuromuscular junction (NMJ), including swellings and ultra-terminal sprouting at motor axon terminals and an increase in the number of endosomes and multivesicular bodies. These structural changes were accompanied by a reduction in spontaneous and evoked release of acetylcholine, indicating a deficit in neurotransmitter release at the NMJ. These deficits in synaptic transmission were associated with elevated levels of ubiquitinated proteins in the synaptosome fraction. In addition to the deficits in neuronal function, mutation of Hgs resulted in both hypermyelinated and dysmyelinated axons in the tn mice, which supports a growing body of evidence that ESCRTs are required for proper myelination of peripheral nerves. Our results indicate that HGS has multiple roles in the nervous system and demonstrate a previously unanticipated requirement for ESCRTs in the maintenance of synaptic transmission.

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P30 CA060553 United States CA NCI NIH HHS; R01 NS047533 United States NS NINDS NIH HHS; NS047533 United States NS NINDS NIH HHS

0 (Endosomal Sorting Complexes Required for Transport)
0 (Phosphoproteins)
0 (hepatocyte growth factor-regulated tyrosine kinase substrate)

Date Created: 20150627 Date Completed: 20160504 Latest Revision: 20220316

20221213

PMC4482608

10.1371/journal.pgen.1005290

26115514