Vikas Bansal, Germany
German Center for Neurodegenerative Diseases (DZNE) Biomedical Data Science & Machine Learning GroupPresenter of 3 Presentations
Computational approaches for interpreting and integrating scRNA‐seq data
LIVE DISCUSSION
A SINGLE-CELL RNA AND CHROMATIN PROFILING OF PARKINSON’S DISEASE PATIENT IPSC-DERIVED DOPAMINERGIC NEURONS
Abstract
Aims
Induced pluripotent stem cell (iPSC)-derived dopaminergic (DA) neurons are an important model to study Parkinson’s disease (PD). About 100 iPSC used in this study were derived from subjects within the Parkinson’s Progression Marker Initiative (PPMI) and have their genetic background characterized. We included healthy controls, idiopathic Parkinson's Disease (iPD) patients with mutations in LRRK2, GBA and SNCA as well as unaffected mutation carriers. Using single-cell RNA sequencing (scRNA-seq) and single-cell ATAC sequencing (scATAC-seq), we aim to explore the cell population heterogeneity, compare the transcriptome profiles and define molecular networks that are perturbed in PD, cell-type specific enrichment of common-SNPs and novel associations with brain disorders, providing disease insight, therapeutic targets and relevant readouts for interventional testing.
Methods
Dopaminergic neurons were produced with an automated culture system, harvested on day 65 and diluted to 1000 cells/ul for capture on the 10X Genomics Chromium controller. We used Seurat (v3) within the R environment for filtering, normalization, integration of multiple single-cell libraries, unsupervised clustering, visualization, and differential expression analysis. We performed pseudotime analysis using Monocle (v3).
Results
Cell clustering produced multiple transcriptionally distinct populations. iPSC-derived dopaminergic neurons cluster showed the highest correlation with the human substantia nigra dopaminergic neurons. Comparing control cell lines and cell lines with different mutations allow us to identify differentially expressed genes that can be associated with PD across cell types.
Conclusions
Our results deliver multiple novelties: (A) a first catalogue of the cell type-specific information for patient-specific iPSC-derived dopaminergic neurons; (B) potential novel genetic associations with PD.