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Bulk RNA sequencing of wildtype and ABCA3 mutant human iPSC-derived mutant containing the ABCA3:GFP fusion reporter

ABSTRACT: We performed transcriptomic profiling of induced pluripotent stem cell (iPSC)-derived iAEC2s containing wildtype, E690K homozygous ABCA3 mutantion, and W308R homozygous ABCA3 mutation. We first performed CRISPR-Cas9 gene editing on a wildtype human iPSC line (BU3) to engineer a GFP reporter bi-allelically targeted at the stop codon of the endigenous ABCA3 locus, thus generating an ABCA3:GFP fusion reporter line (as previous published iin Sun. et al, 2021). Next we utilized CRISPR-Cas9 gene-mutagenesis to introduce two homozygous ABCA3 mutations (E690K and W308R), resulting in two, new ABCA3 mutant iPSC lines containg the ABCA3:GFP fusion reporter, totally a total of 3 ABCA3:GFP fusion iPSC lines (wildtype, E690K-AG, W308R-AG). Following triplicate distal lung directed differentiations of all 3 ABCA3:GFP fusion iPSC lines we sorted the ABCA3:GFP positive iAEC2s on day 43 for transcriptomic analyses.

ORGANISM(S): Homo sapiens

PROVIDER: GSE205319 | GEO | 2023/06/01

REPOSITORIES: GEO

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Project description:We performed transcriptomic profiling of freshly isolated primary adult human alveolar epithelial type 2 cells (AEC2s), their isogenic cultured progeny, and human induced pluripotent stem cell-derived AEC2s (iAEC2s). Distal lung preparations from adult donor lung explants from two individuals were cryopreserved using methods we have previously described. Primary AEC2s were purified using fluorescence activated cell sorting (FACS) to isolate cells co-expressing EPCAM and HTII-280. To establish cultures of primary AEC2s, these cells were combined with MRC5 fibroblasts at an 1:10 ratio on cell culture inserts in CK+DCI medium. iAEC2s were derived using our previously published lung directed differentiation protocol. We used the SPC2 human iPSC line and specifically the SPC2-ST-B2 (SFTPC tdT/WT ) clone containing a SFTPC tdTomato knock-in reporter. SFTPC tdTomato+ cells were sorted on day 41 of differentiation. iAEC2s were single-cell passaged in self-renewing feeder-free 3D cultures approximately every 2 weeks. We used the 10X Chromium System to generate single-cell transcriptomic data from 5 samples prepared in parallel and sequenced on the same day. We profiled (a) preculture primary AEC2s, (b) cultured primary AEC2s, (c) 3D feeder-free iAEC2s, (d) feeder-free iAEC2 cultured on cell culture inserts, and (e) iAEC2s cultured on cell inserts with MRC5 fibroblasts. The cultured primary AEC2 samples and the iAEC2 sample co-cultured with MRC5s were sorted for live EPCAM+ cells prior to encapsulation. All other samples were sorted for live cells. We find that although each population (fresh, primary cultured, and iPSC-derived AEC2s) occupies a distinct transcriptomic space, both cultured primary AEC2s and cultured feeder-free iAEC2s closely resemble their primary pre-cultured counterparts. We also find a continuum of progressively more proliferative states (from fresh primary to cultured primary to cultured iAEC2s) inversely associated with progressively less mature AEC2 states.

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Bulk RNA sequencing of wildtype and ABCA3 mutant human iPSC-derived mutant containing the ABCA3:GFP fusion reporter

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