Dataset Information

Inclusion bodies formed by polyglutamine and poly(glycine-alanine) are enriched with distinct proteomes but converge in proteins that are risk factors for disease and involved in protein degradation

ABSTRACT: Poly(glycine-alanine) (polyGA) is one of the dipolypeptides expressed in Motor Neuron Disease caused by C9ORF72 mutations and accumulates as inclusion bodies in the brain of patients. Superficially these inclusions are similar to those formed by polyglutamine (polyQ) in Huntington’s disease and both have been reported to form an amyloid-like structure suggesting they might aggregate via similar mechanisms to confer cellular dysfunction similarly. Here we investigated which endogenous proteins were enriched in these inclusions and whether aggregation-prone lengths of polyQ (Q97), in context of Huntingtin exon 1, shared similar patterns to aggregation-prone lengths of polyGA (101GA). When co-expressed in the same cell, polyGA101 and HttQ97 inclusions adopted distinct phases with no overlap suggesting different endogenous proteins would be enriched. Proteomic analyses indeed yielded distinct sets of endogenous proteins recruited into the inclusion types. The proteosome, microtubules, Tric chaperones, and translational machinery were enriched in polyGA aggregates, whereas Dnaj chaperones, nuclear envelope and RNA splicing proteins were enriched in polyQ aggregates. Both structures revealed a synergy of degradation machinery including proteins in the polyQ aggregates that are risk factors for other neurodegenerative diseases involving protein aggregation when mutated, which suggests a convergence point in the pathomechanisms of these diseases.

INSTRUMENT(S): LTQ Orbitrap Elite

ORGANISM(S): Mus Musculus (mouse)

TISSUE(S): Permanent Cell Line Cell

DISEASE(S): Amyotrophic Lateral Sclerosis

SUBMITTER: Mona Radwan

LAB HEAD: Prof. Danny M. Hatters

PROVIDER: PXD018824 | Pride | 2020-08-18

REPOSITORIES: Pride

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Dataset's files

Source:

			Action	DRS
	Wholeproteome_GAivsni.pep.xml	Pepxml
	Wholeproteome_GAivsni.prot.xml	Xml
	Wholeproteome_GAivsni_R1.msf	Msf
	Wholeproteome_GAivsni_R1.raw	Raw
	Wholeproteome_GAivsni_R2.msf	Msf

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Publications

Immiscible inclusion bodies formed by polyglutamine and poly(glycine-alanine) are enriched with distinct proteomes but converge in proteins that are risk factors for disease and involved in protein degradation.

Radwan Mona M Lilley Jordan D JD Ang Ching-Seng CS Reid Gavin E GE Hatters Danny M DM

PloS one 20200828 8

Poly(glycine-alanine) (polyGA) is one of the polydipeptides expressed in Frontotemporal Dementia and/or Amyotrophic Lateral Sclerosis 1 caused by C9ORF72 mutations and accumulates as inclusion bodies in the brain of patients. Superficially these inclusions are similar to those formed by polyglutamine (polyQ)-expanded Huntingtin exon 1 (Httex1) in Huntington's disease. Both have been reported to form an amyloid-like structure suggesting they might aggregate via similar mechanisms and therefore re ...[more]

PMID: 32857759

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Project description:Huntington's disease (HD) is a dominantly inherited genetic disease caused by mutant huntingtin (htt) protein with expanded polyglutamine tracts. A neuropathological hallmark of HD is the presence of neuronal inclusions of mutant htt. p62 is an important regulatory protein in selective autophagy, a process by which aggregated proteins are degraded, and it is associated with several neurodegenerative disorders including HD. Here we investigated the effect of p62 depletion in three HD model mice: R6/2, HD190QG and HD120QG mice. We found that loss of p62 in these models led to longer lifespans and reduced nuclear inclusions, although cytoplasmic inclusions increased with polyglutamine length. In mouse embryonic fibroblasts (MEFs) with or without p62, mutant htt with a nuclear localization signal (NLS) showed no difference in nuclear inclusion between the two MEF types. In the case of mutant htt without NLS, however, p62 depletion increased cytoplasmic inclusions. Furthermore, to examine the effect of impaired autophagy in HD model mice, we crossed R6/2 mice with Atg5 conditional knockout mice. These mice also showed decreased nuclear inclusions and increased cytoplasmic inclusions, similar to HD mice lacking p62. These data suggest that the genetic ablation of p62 in HD model mice enhances cytoplasmic inclusion formation by interrupting autophagic clearance of polyQ inclusions. This reduces polyQ nuclear influx and paradoxically ameliorates disease phenotypes by decreasing toxic nuclear inclusions. Gene expression profiles were analyzed to examine the effects of p62 depletion in mouse with or without mutant huntingtin exon 1 To examine the effect of p62 depletion on the transcriptome of Huntington's disease model mice, we crossed p62 knockout mice with HD model mice. We extracted total RNA from the striatum of these mice at 8 weeks and used for a microaaray analysis. The samples are HD transgenic mice with p62 knockout (HD_p62KO), HD mice with normal p62 (HD_p62WT), non-HD-transgenic mice with p62 knockout (NT_p62KO), and non-HD-transgenic mice with normal p62 (NT_p62WT).