Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Transcription profiling by array of post-mortem brain cortex from healthy control patients and amyotrophic lateral sclerosis patients that carry an expanded GGGGCC repeat mutation in the chromosome 9 open reading frame 72 (C9ORF72) gene

ABSTRACT: The purpose of this experiment was to compare differences in the transcript level between RNA samples collected from post-mortem motor cortex from healthy control patients and amyotrophic lateral sclerosis (ALS) patients that carry an expanded GGGGCC repeat mutation in the chromosome 9 open reading frame 72 (C9ORF72) gene.

ORGANISM(S): Homo sapiens

SUBMITTER: Christopher Donnelly

PROVIDER: E-MTAB-1925 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

RNA toxicity from the ALS/FTD C9ORF72 expansion is mitigated by antisense intervention.

Donnelly Christopher J CJ Zhang Ping-Wu PW Pham Jacqueline T JT Haeusler Aaron R AR Mistry Nipun A NA Vidensky Svetlana S Daley Elizabeth L EL Poth Erin M EM Hoover Benjamin B Fines Daniel M DM Maragakis Nicholas N Tienari Pentti J PJ Petrucelli Leonard L Traynor Bryan J BJ Wang Jiou J Rigo Frank F Bennett C Frank CF Blackshaw Seth S Sattler Rita R Rothstein Jeffrey D JD

Neuron 20131001 2

A hexanucleotide GGGGCC repeat expansion in the noncoding region of the C9ORF72 gene is the most common genetic abnormality in familial and sporadic amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD). The function of the C9ORF72 protein is unknown, as is the mechanism by which the repeat expansion could cause disease. Induced pluripotent stem cell (iPSC)-differentiated neurons from C9ORF72 ALS patients revealed disease-specific (1) intranuclear GGGGCCexp RNA foci, (2) dysregul ...[more]

PMID: 24139042

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Project description:Increasing evidence suggests synaptic dysfunction is a central and possibly triggering factor in Amyotrophic Lateral Sclerosis (ALS). Despite this, we still know very little about the molecular profile of an ALS synapse. To address this gap, we designed a synaptic proteomics experiment to perform an unbiased assessment of the synaptic proteome in the ALS brain. We isolated synaptoneurosomes from fresh-frozen postmortem human cortex (11 controls and 18 ALS) and stratified the ALS group based on cognitive profile (Edinburgh Cognitive and Behavioural ALS Screen (ECAS score)) and presence of a C9ORF72 hexanucleotide repeat expansion (C9ORF72 -RE). This allowed us to assess regional differences and the impact of phenotype and genotype on the synaptic proteome, using Tandem Mass Tagging-based proteomics. We identified over 6000 proteins in our synaptoneurosomes and using robust bioinformatics analysis we validated the strong enrichment of synapses. We found more than 30 ALS-associated proteins in synaptoneurosomes, including TDP-43, FUS, SOD1 and C9ORF72. We identified almost 500 proteins with altered expression levels in ALS, with region-specific changes highlighting proteins and pathways with intriguing links to neurophysiology and pathology. Stratifying the ALS cohort by cognitive status revealed almost 150 specific alterations in cognitively impaired ALS synaptic preparations. Stratifying by C9ORF72 -RE status revealed 330 protein alterations in the C9ORF72 -RE+ve group, with KEGG pathway analysis highlighting strong enrichment for postsynaptic dysfunction, related to glutamatergic receptor signalling. We have validated some of these changes by western blot and at a single synapse level using array tomography imaging. In summary, we have generated the first unbiased map of the human ALS synaptic proteome, revealing novel insight into this key compartment in ALS pathophysiology and highlighting the influence of cognitive decline and C9ORF72 -RE on synaptic composition.

Dataset Information

Transcription profiling by array of post-mortem brain cortex from healthy control patients and amyotrophic lateral sclerosis patients that carry an expanded GGGGCC repeat mutation in the chromosome 9 open reading frame 72 (C9ORF72) gene

Publications

RNA toxicity from the ALS/FTD C9ORF72 expansion is mitigated by antisense intervention.

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