Unknown,Transcriptomics,Genomics,Proteomics

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Development of distinct gene expression signature in neurons from different regions of the brain

ABSTRACT: We have performed microarray expression profiling of mouse primary neurons (cortical neurons and granule cell neurons) to model molecular networks and define whether distinct antiviral IFN responses occurred in neurons corresponding to different brain regions. Primary mouse cortical neurons and granule cell neurons were left untreated, treated with 100IU/mL of IFN-M-NM-2, or infected with West Nile virus (MOI of 1) and RNA was harvested after 24 hours. Three independent experiments were performed using a balanced design.

ORGANISM(S): Mus musculus

SUBMITTER: Richard Green

PROVIDER: E-GEOD-42727 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:The M-NM-2 subunits of voltage-gated calcium channels regulate surface expression and gating of CaV1 and CaV2 M-NM-11 subunits, and thus contribute to neuronal excitability, neurotransmitter release and calcium-induced gene regulation. In addition certain M-NM-2 subunits are targeted into the nucleus, where they directly interact with the epigenetic machinery. Whereas their involvement in this multitude of functions is reflected by a great molecular heterogeneity of M-NM-2 isoforms derived from four genes and abundant alternative splicing, little is known about the roles of individual M-NM-2 variants in specific neuronal functions. In the present study, an alternatively spliced M-NM-24 subunit lacking the variable N-terminus (M-NM-24e) is identified. It is highly expressed in mouse cerebellum and cultured cerebellar granule cells (CGC) and modulates P/Q-type calcium currents in tsA cells and CaV2.1 surface expression in neurons. Compared to the other two known full-length M-NM-24 variants (M-NM-24a, M-NM-24b) M-NM-24e is most abundantly expressed in the distal axon, but lacks nuclear targeting properties. To examine the importance of nuclear targeting of M-NM-24 subunits for transcriptional regulation, we performed whole genome expression profiling of CGCs from lethargic mice individually reconstituted with M-NM-24a, M-NM-24b, and M-NM-24e. Notably, the number of genes regulated by each M-NM-24 splice variant correlated with the rank order of their nuclear targeting properties (M-NM-24b> M-NM-24a> M-NM-24e). Together these findings support isoform-specific functions of M-NM-24 splice variant in neurons, with M-NM-24b playing a dual role in channel modulation and gene regulation, while the newly detected M-NM-24e variant serves exclusively in calcium channel-dependent functions. We used microarrays to identify gene expression changes caused by M-NM-24 splice variants (M-NM-24a, M-NM-24b and M-NM-24e) of the voltage gated calcium channel in cultured cerebellar granule cells of lethargic mice Cultured cerebellar granule cells from lethargic (129/SvJ background) mice reconstituted with the M-NM-24 splice variants (M-NM-24a, M-NM-24b and M-NM-24e) were compared to eGFP transfected controls

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Development of distinct gene expression signature in neurons from different regions of the brain

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