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A lysosomal regulatory circuit essential for the development and function of microglia

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Danio rerio

PROVIDER: GSE197350 | GEO | 2022/07/15

REPOSITORIES: GEO

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A lysosomal regulatory circuit essential for the development and function of microglia.

Project description:As the primary phagocytic cells of the central nervous system, microglia exquisitely regulate their lysosomal activity to facilitate brain development and homeostasis. However, mechanisms that coordinate lysosomal activity with microglia development, chemotaxis, and function remain unclear. Here, we show that embryonic macrophages require the lysosomal guanosine triphosphatase (GTPase) RagA and the GTPase-activating protein Folliculin to colonize the brain in zebrafish. We demonstrate that embryonic macrophages in rraga mutants show increased expression of lysosomal genes but display significant down-regulation of immune- and chemotaxis-related genes. Furthermore, we find that RagA and Folliculin repress the key lysosomal transcription factor Tfeb and its homologs Tfe3a and Tfe3b in the macrophage lineage. Using RNA sequencing, we establish that Tfeb and Tfe3 are required for activation of lysosomal target genes under conditions of stress but not for basal expression of lysosomal pathways. Collectively, our data define a lysosomal regulatory circuit essential for macrophage development and function in vivo.

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A lysosomal regulatory circuit essential for the development and function of microglia

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Project description:This SuperSeries is composed of the SubSeries listed below.

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