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Updated: Jun 28, 2025
Detection of MicroRNAs in Microglia by Real-time PCR in Normal CNS and During Neuroinflammation
Published on: July 23, 2012
An integrated toolkit for human microglia functional genomics
Imdadul Haq1,2,3, Jason C Ngo1,2,3, Nainika Roy1,2,3
1Center for Translational and Computational Neuroimmunology, Columbia University Medical Center, New York, NY, USA.
Background:
Microglia, the brain's resident immune cells, play vital roles in brain development, and disorders like Alzheimer's disease (AD). Human iPSC-derived microglia (iMG) provide a promising model to study these processes. However, existing iMG generation protocols face challenges, such as prolonged differentiation time, lack of detailed characterization, and limited gene function investigation via CRISPR-Cas9.
Methods:
Our integrated toolkit for in-vitro microglia functional genomics optimizes iPSC differentiation into iMG through a streamlined two-step, 20-day process, producing iMG with a normal karyotype. We confirmed the iMG's authenticity and quality through single-cell RNA sequencing, chromatin accessibility profiles (ATAC-Seq), proteomics and functional tests. The toolkit also incorporates a drug-dependent CRISPR-ON/OFF system for temporally controlled gene expression. Further, we facilitate the use of multi-omic data by providing online searchable platform that compares new iMG profiles to human primary microglia: https://sherlab.shinyapps.io/IPSC-derived-Microglia/ .
Results:
Our method generates iMG that closely align with human primary microglia in terms of transcriptomic, proteomic, and chromatin accessibility profiles. Functionally, these iMG exhibit Ca2 + transients, cytokine driven migration, immune responses to inflammatory signals, and active phagocytosis of CNS related substrates including synaptosomes, amyloid beta and myelin. Significantly, the toolkit facilitates repeated iMG harvesting, essential for large-scale experiments like CRISPR-Cas9 screens. The standalone ATAC-Seq profiles of our iMG closely resemble primary microglia, positioning them as ideal tools to study AD-associated single nucleotide variants (SNV) especially in the genome regulatory regions.
Conclusions:
Our advanced two-step protocol rapidly and efficiently produces authentic iMG. With features like the CRISPR-ON/OFF system and a comprehensive multi-omic data platform, our toolkit equips researchers for robust microglial functional genomic studies. By facilitating detailed SNV investigation and offering a sustainable cell harvest mechanism, the toolkit heralds significant progress in neurodegenerative disease drug research and therapeutic advancement.
Insights
We developed a rapid, 20-day protocol to generate authentic human induced pluripotent stem cell-derived microglia (iMG) for Alzheimer's disease research. This toolkit enables functional genomics studies and investigation of genetic variants in neurodegenerative diseases.
Area of Science:
- Neuroscience
- Immunology
- Genetics
Background:
- Microglia are crucial brain immune cells involved in development and diseases like Alzheimer's disease (AD).
- Human induced pluripotent stem cell-derived microglia (iMG) are valuable models, but current protocols are lengthy and lack comprehensive characterization.
- Existing methods limit gene function studies using CRISPR-Cas9 in iMG.
Purpose of the Study:
- To develop an optimized, rapid protocol for generating high-quality iMG.
- To create a toolkit for functional genomics studies in iMG.
- To facilitate the investigation of genetic variants in neurodegenerative diseases.
Main Methods:
- A streamlined two-step, 20-day protocol for iPSC differentiation into iMG with normal karyotype.
- Characterization using single-cell RNA sequencing, ATAC-Seq, proteomics, and functional assays.
- Incorporation of a drug-dependent CRISPR-ON/OFF system for controlled gene expression and an online multi-omic data platform.
Main Results:
- Generated iMG closely mirroring human primary microglia transcriptomically, proteomically, and epigenetically.
- Demonstrated iMG functionality including Ca2+ transients, cytokine response, migration, and phagocytosis of AD-related substrates.
- Established iMG as suitable models for studying AD-associated single nucleotide variants (SNVs) in regulatory regions.
Conclusions:
- The developed protocol rapidly and efficiently produces authentic iMG.
- The toolkit supports robust microglial functional genomics and SNV investigation.
- This advancement promises progress in neurodegenerative disease drug discovery and therapy.
