Single-cell transcriptomics defines an improved, validated monoculture protocol for differentiation of human iPSC to
Sam J Washer1,2,3, Marta Perez-Alcantara4,5, Yixi Chen4,5
1James and Lillian Martin Centre for Stem Cell Research, Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford, OX1 3RE, UK. sam.washer@path.ox.ac.uk.
Abstract:
There is increasing genetic evidence for the role of microglia in neurodegenerative diseases, including Alzheimer's, Parkinson's, and motor neuron disease. Therefore, there is a need to generate authentic in vitro models to study human microglial physiology. Various methods have been developed using human induced Pluripotent Stem Cells (iPSC) to generate microglia, however, systematic approaches to identify which media components are actually essential for functional microglia are mostly lacking. Here, we systematically assess medium components, coatings, and growth factors required for iPSC differentiation to microglia. Using single-cell RNA sequencing, qPCR, and functional assays, with validation across two labs, we have identified several medium components from previous protocols that are redundant and do not contribute to microglial identity. We provide an optimised, defined medium which produces both transcriptionally and functionally relevant microglia for modelling microglial physiology in neuroinflammation and for drug discovery.
Insights
Researchers optimized a defined medium for generating human microglia from induced pluripotent stem cells (iPSC). This advancement aids in studying neurodegenerative diseases and discovering new drugs for neuroinflammation.
Area of Science:
- Neuroscience
- Stem Cell Biology
- Immunology
Background:
- Microglia play a crucial role in neurodegenerative diseases like Alzheimer's and Parkinson's.
- Accurate in vitro models of human microglia are essential for research.
- Current methods for generating microglia from induced pluripotent stem cells (iPSCs) lack systematic optimization of media components.
Purpose of the Study:
- To systematically identify essential media components, coatings, and growth factors for differentiating iPSCs into functional human microglia.
- To develop an optimized, defined medium for reliable microglia generation.
- To facilitate the study of microglial physiology in neuroinflammation and support drug discovery.
Main Methods:
- Systematic assessment of various medium components, coatings, and growth factors.
- Differentiation of human induced pluripotent stem cells (iPSCs) into microglia.
- Analysis using single-cell RNA sequencing, quantitative PCR (qPCR), and functional assays.
- Validation of results across two independent laboratories.
Main Results:
- Several previously used medium components were identified as redundant for achieving microglial identity.
- An optimized, defined medium was established for efficient iPSC-derived microglia generation.
- The generated microglia demonstrated both transcriptional and functional relevance.
- Results were validated across two different laboratory settings.
Conclusions:
- A streamlined and optimized protocol for generating functional human microglia from iPSCs has been developed.
- This optimized medium supports the creation of authentic models for studying microglial roles in neuroinflammation.
- The findings will advance research in neurodegenerative diseases and aid in the discovery of novel therapeutics.
