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Updated: Nov 23, 2025
Using RNA-interference to Investigate the Innate Immune Response in Mouse Macrophages
Published on: November 3, 2014
High-Throughput CRISPR Screening Identifies Genes Involved in Macrophage Viability and Inflammatory Pathways
Sergio Covarrubias1, Apple Cortez Vollmers1, Allyson Capili1
1Department of Molecular, Cell and Developmental Biology, University of California, Santa Cruz, Santa Cruz, CA, USA.
Abstract:
Macrophages are critical effector cells of the immune system, and understanding genes involved in their viability and function is essential for gaining insights into immune system dysregulation during disease. We use a high-throughput, pooled-based CRISPR-Cas screening approach to identify essential genes required for macrophage viability. In addition, we target 3' UTRs to gain insights into previously unidentified cis-regulatory regions that control these essential genes. Next, using our recently generated nuclear factor κB (NF-κB) reporter line, we perform a fluorescence-activated cell sorting (FACS)-based high-throughput genetic screen and discover a number of previously unidentified positive and negative regulators of the NF-κB pathway. We unravel complexities of the TNF signaling cascade, showing that it can function in an autocrine manner in macrophages to negatively regulate the pathway. Utilizing a single complex library design, we are capable of interrogating various aspects of macrophage biology, thus generating a resource for future studies.
Insights
This study identifies essential genes for macrophage viability and function using CRISPR screening. Researchers also discovered new regulators of the nuclear factor κB (NF-κB) pathway, revealing insights into immune system regulation.
Area of Science:
- Immunology
- Genetics
- Molecular Biology
Background:
- Macrophages are key immune cells involved in disease.
- Understanding genes controlling macrophage viability and function is crucial for immune system research.
- Dysregulation of immune responses is implicated in various diseases.
Purpose of the Study:
- To identify genes essential for macrophage viability using CRISPR screening.
- To uncover novel cis-regulatory elements controlling essential macrophage genes.
- To discover new regulators of the nuclear factor κB (NF-κB) pathway in macrophages.
Main Methods:
- High-throughput, pooled-based CRISPR-Cas screening for essential genes.
- Targeting 3' untranslated regions (UTRs) to identify cis-regulatory elements.
- Fluorescence-activated cell sorting (FACS)-based screening using an NF-κB reporter line.
Main Results:
- Identification of genes critical for macrophage viability.
- Discovery of previously unknown cis-regulatory regions influencing gene expression.
- Uncovering novel positive and negative regulators of the NF-κB pathway.
- Elucidation of autocrine TNF signaling negatively regulating the NF-κB pathway.
Conclusions:
- A comprehensive CRISPR screening approach can interrogate multiple facets of macrophage biology.
- This study provides a valuable resource for future research into macrophage function and immune dysregulation.
- Findings advance the understanding of NF-κB pathway regulation and TNF signaling in macrophages.
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