Unknown,Transcriptomics,Genomics,Proteomics

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Amplicons of a ND5 mRNA segment to detect m1A1374 levels in HEK APPwt and Ctl cells

ABSTRACT: This experiment was set up to quantify m1A methylation levels at position 1374 of the mitochondrial encoded ND5 mRNA. To investigate the relevance of this methylation in Alzheimer's disease two cell lines were compared. HEK APPwt cells, transfected with a plasmid encoding the wild-type Amyloid-Precursor-protein and untransfected control cells were used. In the first step a RT was performed with SuperScript-IV (SS-IV) and a ND5 specific RT primer. Afterwards a PCR was conducted to amplify the sequence around the m1A position. The amplicon is about 100 bp length and was sequenced in an Illumina Sequencing was performed in a MiSeq 2x75 PE run. For both cell lines the m1A analysis method was conducted with 4 biological replicates of total RNA and 2 biological replicates of RNA isolated from mitochondrial extracts.

INSTRUMENT(S): Illumina HiSeq 1000

ORGANISM(S): Homo sapiens

SUBMITTER: Johanna Plehn

PROVIDER: E-MTAB-12033 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:CHD5 is frequently deleted in neuroblastoma, and appears to be a tumor suppressor gene; however, little is known about the role of CHD5. We found CHD5 mRNA was restricted to brain; by contrast most other remodeling ATPases were broadly expressed. CHD5 protein isolated from mouse brain was associated with HDAC2, p66, MTA3 and RbAp46 in a megadalton complex. CHD5 protein was detected in several rat brain regions and appeared to be enriched in neurons. CHD5 protein was predominantly nuclear in primary rat neurons and brain sections. Microarray analysis revealed genes that were upregulated and downregulated when CHD5 was depleted from primary neurons. CHD5 depletion altered expression of neuronal genes, transcription factors, and brain-specific subunits of the SWI/SNF remodeling enzyme. Aging and Alzheimers gene sets were strongly affected by CHD5 depletion from primary neurons. Chromatin immunoprecipitation revealed CHD5 bound to these genes, suggesting the regulation was direct. Together, these results indicate that CHD5 is found in a NuRD-like multi-protein complex. CHD5 is restricted to the brain, unlike the closely related family members CHD3 and CHD4. CHD5 regulates expression of neuronal genes, cell cycle genes and remodeling genes. CHD5 is linked to regulation of aging and Alzheimer’s genes. CHD5 KD shRNA sequences were designed according to the instructions for the pLKO.1 system (Addgene). Control was as described (Sci307-1098,2005) Scramble, clone 1864 from Addgene). Virus was packaged using HEK-293T cells, pLKO.1 vector with shRNA inserts for CHD5, and the control. 48 hours after transfection of 293 cells, medium containing virus was filtered (0.45 micron), then applied for 6 hours to primary cortical neurons one day after the neurons were plated (Day 1). Medium was removed, and replaced with Neural Basal Medium, and the cells were cultured until Day 5, 9 or 12. RNA was harvested from 3 replicates of the treated primary cortical neurons at each time point. RNA was isolated using RNAeasy Kit (Qiagen), Quality and quantity of the total RNA was checked with the Agilent 2100 bioanalyzer using RNA 6000 Nano chips. RNA was labeled using the standard Illumina protocol and Illumina TotalPrep RNA Amplification Kit (Ambion; Austin, TX, cat # IL1791) Biotin labeled cRNA was hybridized to Illumina's Sentrix Rat Ref-12 v1 Expression BeadChips.

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Amplicons of a ND5 mRNA segment to detect m1A1374 levels in HEK APPwt and Ctl cells

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