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| Status |
Public on Nov 21, 2013 |
| Title |
Early gene expression changes in spinal cord from SOD1G93A Amyotrophic Lateral Sclerosis animal model |
| Organism |
Mus musculus |
| Experiment type |
Expression profiling by array
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| Summary |
Amyotrophic Lateral Sclerosis (ALS) is an adult-onset and fast progression neurodegenerative disease that leads to the loss of motor neurons. Mechanisms of selective motor neuron loss in ALS are unknown. The early events occurring in the spinal cord that may contribute to motor neuron death are not described, neither astrocytes participation in the pre-symptomatic phases of the disease. In order to identify ALS early events, we performed a microarray analysis employing a whole mouse genome platform to evaluate the gene expression pattern of lumbar spinal cords of transgenic SOD1G93A mice and their littermate controls at pre-symptomatic ages of 40 and 80 days. Differentially expressed genes were identified by means of the Bioconductor packages Agi4x44Preprocess and limma. FunNet web based tool was used for analysis of over-represented pathways. Furthermore, immunolabeled astrocytes from 40 and 80 days old mice were submitted to laser microdissection and RNA was extracted for evaluation of a selected gene by qPCR. Statistical analysis has pointed to 492 differentially expressed genes (155 up and 337 down regulated) in 40 days and 1105 (433 up and 672 down) in 80 days old ALS mice. The KEGG pathways tight junction, antigen processing and presentation, oxidative phosphorylation, endocytosis, chemokine signaling pathway, ubiquitin mediated proteolysis and glutamatergic synapse were found over-represented at both 40 and 80 days pre-symptomatic ages. Ube2i gene expression was evaluated in astrocytes from both transgenic ages, being up regulated in 40 and 80 days astrocytes enriched samples. Our data points to important early molecular events occurring in pre-symptomatic phases of ALS in mouse model. Early SUMOylation process linked to astrocytes might account to non autonomous cell toxicity in ALS. Further studies on the signaling pathways presented here may provide new insights to better understand the events triggering motor neuron death in this devastating disorder.
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| Overall design |
Whole lumbar spinal cord from SOD1G93A and Non transgenic controls from 40 and 80 days were used in the experiments. 4 biological replicates were used. A reference sample, comprised by RNA from different neonatal organs (heart, liver, kidney) were used in the hybridations
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| Contributor(s) |
Oliveira GP, Alves CJ, Chadi G |
| Citation(s) |
24302897 |
| Submission date |
Sep 05, 2013 |
| Last update date |
Jan 12, 2017 |
| Contact name |
Gabriela Pintar Oliveira |
| E-mail(s) |
gabrielapintar@usp.br
|
| Organization name |
University of Sao Paulo Medical School
|
| Department |
Neurology
|
| Street address |
Dr Arnaldo Av, 455, 2nd floor
|
| City |
São Paulo |
| State/province |
Outside the US or Canada |
| ZIP/Postal code |
01246-903 |
| Country |
Brazil |
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| Platforms (1) |
| GPL7202 |
Agilent-014868 Whole Mouse Genome Microarray 4x44K G4122F (Probe Name version) |
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| Samples (16)
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| GSM1225219 |
40 days old wild-type mice replicate 4 |
| GSM1225220 |
40 days old SOD1G93A transgenic mice replicate 1 |
| GSM1225221 |
40 days old SOD1G93A transgenic micereplicate 2 |
| GSM1225222 |
40 days old SOD1G93A transgenic micereplicate 3 |
| GSM1225223 |
40 days old SOD1G93A transgenic mice replicate 4 |
| GSM1225224 |
80 days old wild-type mice replicate 1 |
| GSM1225225 |
80 days old wild-type mice replicate 2 |
| GSM1225226 |
80 days old wild-type mice replicate 3 |
| GSM1225227 |
80 days old wild-type mice replicate 4 |
| GSM1225228 |
80 days old SOD1G93A transgenic mice replicate 1 |
| GSM1225229 |
80 days old SOD1G93A transgenic mice replicate 2 |
| GSM1225230 |
80 days old SOD1G93A transgenic mice replicate 3 |
| GSM1225231 |
80 days old SOD1G93A transgenic mice replicate 4 |
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| Relations |
| BioProject |
PRJNA218148 |
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