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Interneuron origin and molecular diversity in the human fetal brain

ABSTRACT: GABAergic inhibitory neurons are crucial in maintaining the stability of neural circuits through synaptic inhibition in the human brain. In this study, we used single-cell RNA sequencing to profile the transcriptomes of fetal cells collected along an early developmental time course to clarify the origin and diversification of interneurons. The heterogeneity of interneurons within the human subpallium is observed in ganglionic eminence precursors and driven by a string of gene regulatory networks that exhibit evident differences in the subventricular zone during the late first trimester. We identified conserved molecular signatures between the cardinal interneuron subtypes of ganglionic eminence precursors and adult interneurons through comparing embryonic and mature cortex data sets.

ORGANISM(S): Homo sapiens

PROVIDER: GSE165388 | GEO | 2021/08/10

REPOSITORIES: GEO

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Project description:The Dlx homeodomain transcription factors are implicated in regulating the function of inhibitory GABAergic interneurons; therefore understanding their functions will provide insights into disorders such as epilepsy, mental retardation and autism. Identifying genes that are downstream of Dlx1/2 function and are relevant for the differentiation and survival of GABAergic interneurons. During embryonic development, cortical GABAergic interneurons are generated in the proliferative zone of the medial ganglionic eminence (MGE), from where they migrate to reach their final positions in the cortex. The differentiation of these interneuron precursors is dependent on Dlx genes, as shown by Dlx1/Dlx2 double mutants, which have a block in GABAergic cell differentiation and in cell migration. When interneuron progenitors are isolated from the mutant MGE and growth in culture, they are able to proceed along their differentiation program. However, mutant cells growth in vitro show defects in cell morphogenesis and increased cell apoptosis. We hypothesize that Dlx transcription factors regulate important aspects of GABAergic neuron differentiation such as the formation and growth of axon and dendrites, and the formation of inhibitory synapses. We generated E15.5 mouse embryos that are Dlx1/2 -/- or Dlx1/2 +/?. Genotype was confirmed by PCR. A total of 8 litters were used. For each experiment, we pooled tissue from at least 6 different embryos of the same genotype. We dissected the ventricular and subventricular zones of the MGE (rostral part). This area contains ~1 million of progenitor cells per embryo. We isolated total RNA using the Stratagene RNA Miniprep kit (these samples are called MGE+/ and MGE-/- in our proposal). In addition, we used the same area (ventricular and subventricular zones of the rostral MGE) to perform primary neuronal cultures. Cells were maintained 3 days in vitro. After that, we isolated total RNA using the Stratagene RNA Miniprep kit (samples called primary cells+/ and primary cells-/- in our proposal). We would like to perform gene expression comparison between: 1) MGE+/ and MGE-/-, and 2) primary cells+/ and primary cells-/-.

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Interneuron origin and molecular diversity in the human fetal brain

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