Figure 1. Schematic for the STEMdiff™ Ventral Forebrain Organoid Differentiation Kit
Human ES or iPS cell-derived ventral forebrain organoids can be generated in 43 days. Embryoid bodies can be created in 6 days with AggreWell™800 plates. The EBs are then cultured in suspension, allowing growth and subsequent patterning to the ventral forebrain. For the long-term maintenance and further maturation of ventral forebrain organoids, see the PIS.
Figure 2. STEMdiff™ Ventral Forebrain Organoid Differentiation Kit Supports the Generation of Homogeneous Organoids
(A) Neural aggregates formed in AggreWell™800 microwell plates exhibit uniform size and shape at day 6. H9-derived ventral forebrain organoids from a single batch have spherical morphology at days (B) 15 (C) 25 (D) 50 (E) 75 and (F) 100. Scale bar = 1 mm. (G) Ventral forebrain organoids exhibit homogeneous size over multiple cell lines (average ± SD, using 11 cell lines with 3 - 5 organoids counted per cell line and time point).
Whole-well images of dorsal forebrain organoid cultures derived from the H9 cell line in STEMdiff™ Forebrain Organoid Expansion Medium (bottom row) vs. the control published formulation (top row) show the extent of fusion typical in control media without orbital shaking. At Day 10 post-seeding in the control formulation, 12/12 organoids that were seeded are developing, but by Day 20 a single, larger organoid can be seen in the well. In STEMdiff™ Forebrain Organoid Expansion Medium, 20/20 seeded organoids are developing and 20/20 are still developing at Day 20 without shaking. While organoids in both culture conditions grow larger between 10 and 20 days, the reduction in organoids and enlarged size in the control formulation suggest a reduction in organoid yield due to organoid fusion.
Figure 4. Ventral Forebrain Organoids Exhibit Brain-Region-Specific Marker Expression as They Mature
(A) Ventral forebrain organoids at day 25 exhibit a high level of expression of NKX2.1 (magenta; DAPI, gray). (B) NKX2.1-positive neurons (magenta; DAPI, cyan) are plentiful by Day 50 (DAPI, cyan), but Somatostatin-positive GABAergic interneurons (SST, green) are rare. (C) By day 75, SST-positive interneurons (green; NKX2.1, magenta) are observable.
Figure 5. Neural Organoids Generated with STEMdiff™ Dorsal and Ventral Forebrain Organoid Kits Express Key Markers of Brain-Region-Specific Patterning
RNA from single organoids was harvested at a series of time points and subsequently assayed using bulk RNA-seq (1 data column = 1 organoid). (A) Heat map of select genes shows that both dorsal forebrain organoids (DFO) and ventral forebrain organoids (VFO) express the forebrain-specific marker FOXG1 while showing a shift from neural progenitor fates to neuronal cell types. (B) DFO express increasing levels of cortex- and glutaminergic neuron-specific genes from day 25 to 75. (C) Day 25 VFO exhibit high expression of markers of the medial ganglionic eminence and of GABAergic neurons. Heat map scale quantifies gene expression across each row with a normalized z-score for each gene.
Figure 6. Dorsal Forebrain Organoids, Not Ventral Forebrain Organoids, Display Early Network Bursting Activity
Day 50 dorsal and ventral forebrain organoids were plated on a microelectrode array (MEA; CytoView MEA 96, Axion Biosystems) coated with 0.1% polyethyleneimine in borate buffer and 20 µg/mL CellAdhere™ Laminin-521. Activity from 8 electrodes per well was recorded once per week for 4 weeks using a Maestro MEA system (Axion Biosystems). (A) Representative bright field image of dorsal and ventral forebrain organoids on the MEA. Insets show representative spike rate heat maps for the corresponding well (red = 12 spikes/sec). Scale bar = 1 mm. (B) Raster plots of spike activity show increasing network bursting (pink lines) for dorsal forebrain organoids between week 1 and week 4, whereas no network bursting is observed in the ventral forebrain organoid (lower panels) over the same time period. (C) Mean firing rate (average ± SEM; 3 - 6 organoids per time point) increases for dorsal forebrain organoids but not ventral forebrain organoids over 4 weeks of measurements.
Figure 7. Fluorescent Imaging in BrainPhys™ Imaging Optimized Medium Improves Signal-to-Background Ratios of 3D Neural Cultures
GFP-labeled ventral forebrain organoids were co-cultured and merged with unlabeled dorsal forebrain organoids for one week prior to live imaging in Forebrain Organoid Differentiation Medium from STEMdiff™ Dorsal Forebrain Organoid Differentiation Kit (right) or BrainPhys™ Imaging Optimized Medium (BPI, left). Interneuron migration can be visualized more clearly in BPI. Scale bar top panels = 300μm; scale bar bottom = 100μm. Adapted from Zabolocki et al. 2020, Nature Communications, available under a Creative Commons 4.0 License. For experimental details on generating AssemBloids™ from dorsal and ventral forebrain organoid co-cultures, see the protocol in our Methods Library.
Guided ventral forebrain organoids were generated from H9 ESCs using STEMdiff™ Ventral Forebrain Organoid Differentiation Kit. scRNA-seq gene expression data captures the cellular diversity of these neural organoids which can be further explored using the Single Cell RNA Sequencing Data Visualization Tool for Neural Organoids. At Day 50, the organoids were dissociated into a single-cell suspension. The library was prepared using Chromium Single Cell 3ʹ v1 protocol with Feature Barcoding technology (10x Genomics) following surface protein staining with TotalSeq™–B (BioLegend). The barcoded processing, gene counting and aggregation were done using the Cell Ranger software v3.1.0. Further processing and demultiplexing was done with Seurat v4.1.1. The data have been made publicly available on GEO: GSE218457. ESC = embryonic stem cell
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