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Proteomics of motor neuron in ASL model sorted by FACS

ABSTRACT: Amyotrophic lateral sclerosis (ALS), the most common form of motor neuron disease, is characterized by progressive muscle weakness and paralysis caused by degeneration of upper and lower motor neurons. A major breakthrough in understanding the genetics of ALS was the discovery of a GGGGCC hexanucleotide repeat expansion (HRE) within the non-coding region of chromosome 9 open reading frame 72 (C9orf72) as the most common mutation in both familial and sporadic forms of ALS [25, 80]. We report that C9orf72 loss of function and poly(GP) expression act together to induce motor neuron degeneration and paralysis. These synergistic properties of C9orf72 mutation affect autophagy, thus resulting in poly(GP) and p62 aggregation. In this context, poly(GP) accumulation occurs in motor neurons preferentially, along with swollen mitochondria, a typical signature of mitophagy defects. In motor neurons, accumulated abnormal mitochondria engage caspase cascade, ultimately giving rise to apoptotic cell death of motor neurons that results in paralysis

INSTRUMENT(S): Q Exactive

ORGANISM(S): Danio Rerio (zebrafish) (brachydanio Rerio)

TISSUE(S): Brain, Motor Neuron

DISEASE(S): Amyotrophic Lateral Sclerosis

SUBMITTER: Chiara guerrera

LAB HEAD: Chiara Guerrera

PROVIDER: PXD023967 | Pride | 2021-05-11

REPOSITORIES: Pride

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			Action	DRS
	191216_LFQ_n1-6_HoCA_C9-c-1.raw	Raw
	191216_LFQ_n1-6_HoCA_C9-c-2.raw	Raw
	191216_LFQ_n1-6_HoCA_C9-c-3.raw	Raw
	191216_LFQ_n1-6_HoCA_C9-d-1.raw	Raw
	191216_LFQ_n1-6_HoCA_C9-d-2.raw	Raw

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Project description:Aims: Loss of nuclear TDP-43 characterises sporadic and most familial forms of amyotrophic lateral sclerosis (ALS). TDP-43 (encoded by TARDBP) has multiple roles in RNA processing. We aimed to determine whether 1) RNA splicing dysregulation is present in lower motor neurons in ALS and in a motor neuron-like cell model, and 2) TARDBP mutations (mtTARDBP) are associated with aberrant RNA splicing using patient-derived fibroblasts. Methods: Affymetrix exon arrays were used to study mRNA expression and splicing in lower motor neurons obtained by laser capture microdissection of autopsy tissue from individuals with sporadic ALS and TDP-43 proteinopathy. Findings were confirmed by qRT-PCR and in NSC34 motor neuronal cells following shRNA-mediated TDP-43 depletion. Exon arrays and immunohistochemistry were used to study mRNA splicing and TDP-43 expression in fibroblasts from patients with mtTARDBP-associated, sporadic and mutant SOD1-associated ALS. Results: We found altered expression of spliceosome components in motor neurons and widespread aberrations of mRNA splicing that specifically affected genes involved in ribonucleotide binding. This was confirmed in TDP-43 depleted NSC34 cells. Fibroblasts with mtTARDBP showed loss of nuclear TDP-43 protein and demonstrated similar changes in splicing and gene expression, that were not present in fibroblasts from patients with sporadic or SOD1-related ALS. Conclusion: Loss of nuclear TDP-43 is associated with RNA processing abnormalities in ALS motor neurons, patient-derived cells with mtTARDBP, and following artificial TDP-43 depletion, suggesting that splicing dysregulation directly contributes to disease pathogenesis. Key functional pathways affected include those central to RNA metabolism. RNA was extracted from lower motor neurons obtained by laser capture microdissection from autopsy material from neurologically healthy controls (n=6) and cases of sporadic ALS (n=3) and ALS due to C9ORF72 mutations (n=3).

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Proteomics of motor neuron in ASL model sorted by FACS

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