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Consequences of ZNF292 deficiency for human cortical interneuron development

ABSTRACT: Consequences of ZNF292 deficiency for human cortical interneuron development

PROVIDER: PRJNA1051157 | ENA |

REPOSITORIES: ENA

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Consequences of ZNF292 deficiency for human cortical interneuron development

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Project description:We have used our protocol for generating cortical interneurons from human embryonic stem cells (hESCs) to study gene expression changes during this process, to identify regulatory networks critical to cortical interneuron development. Samples were collected at day 0 (hESCs), day 15 (ventral telencephalic patterned medial ganglionic eminence-like progenitors), day 35 (immature interneurons), and day 60 (mature interneurons).

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Comparative analysis of different cortical interneuron groups.

Project description:GABAergic interneuron in the cortex comprise a very heterogenous group. and it is critical to identify discrete interneuron types to understand how their contributions to behavior can be modulated by external and internal cues. However, molecular difinition of these interneuron cell groups has been difficult. Comparative analysis of different interneuron subtypes can provide us new candidate marker genes which could target more specific interneu?on cell group. Here we identify oxytocin responsive novel class of interneuron through our comparative analysis. We employed the bacTRAP strategy, which uses BAC transgenic mice expressing EGFP-tagged ribosomal protein L10a in specific cell populations, to affinity purify polysome-bound mRNAs from Nek7, Dlx1, Cort, Htr3a, Oxtr expressing cortical interneurons. We show that Oxtr expressing cells are a subtype of somatostatin positive interneurons. Three independent TRAP replicates were collected and total RNA from the immunoprecipitates or flow-through (input) whole cortex lysates were amplified and hybridized. Data were normalized with the GCRMA algorithm and replicates were averaged across conditions. We recommend filtering data to remove probe sets with normalized expression values less than 50 in at least one condition. Because the Nek7 BAC labels non-neuronal cells, we recommend to delete astrocytes and oligodendrocytes genes from the list using GSE13379 data.

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Project description:In the mammalian cortex, about 60% of GABAergic interneurons, mainly including parvalbumin-expressing (PV+) and somatostatin (SST+) interneurons are generated from the medial ganglionic eminence (MGE) in the subpallium and tangentially migrate to the cortex. Here we analyze the role of the Sp9 transcription factor in regulating the development of MGE-derived cortical interneurons. We show that SP9 is widely expressed in the MGE subventricular zone (SVZ) and in MGE-derived migrating interneurons. By analyzing Sp9 null and conditional mutant mice, we demonstrate that Sp9 promotes MGE progenitor proliferation in the SVZ and is required for the normal patterning of tangential migration and the laminar distribution of MGE-derived cortical GABAergic interneurons. Loss of Sp9 function results in a ~50% reduction of MGE-derived cortical interneurons, an ectopic aggregation of MGE-derived neurons in the embryonic ventral telencephalon, and an increased ratio of SST+/PV+ cortical interneurons. Finally, we provide evidence that Sp9 regulates MGE derived cortical interneuron development through promoting expression of the Lhx6 and Lhx8 transcription factors.

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