Elp1 is required for myeloid differentiation and brain repopulation.

Elp1 is essential for the generation of myeloid cells during brain microglia repopulation in a genetic screen of 20,000 perturbations.

• Why it matters: Understanding molecular regulators of HSPC-derived myeloid lineage commitment in the brain is limited by the scarcity of primary HSPCs, hindering large-scale genetic studies.
• What they did: Researchers expanded primary cultured HSPCs ex vivo, genetically manipulated them, and screened approximately 20,000 perturbations to identify genes involved in myeloid differentiation, including Elp1.
• The result: Elp1 was found to suppress the unfolded protein response and was necessary for myeloid cell generation, providing insights into molecular mechanisms of brain myeloid biology.