ArticlebioRxiv : the preprint server for biology2026
Macrophages regulate meiotic initiation and germ cell clearance in the developing ovary.
Article in bioRxiv : the preprint server for biology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Tissue-resident macrophages are increasingly recognized for their roles in promoting organogenesis, yet how macrophages are involved in fetal ovarian development remains unclear. In particular, little is known about ovarian macrophage ontogeny and how it relates to germ cell entry into meiosis and establishment of the oocyte reserve. Here we combine temporally-controlled lineage tracing of yolk-sac erythro-myeloid progenitors, fetal HSC-derived progenitors, and postnatal monocytes to map multi-wave seeding and remodeling of ovarian macrophages across fetal and early postnatal life. We identify three major resident subsets defined by MHCII and CSF1R that display distinct expansion kinetics and persistence, and we show that CCR2-dependent monocyte recruitment is required for efficient maturation of postnatal macrophage populations. Functionally, transient or sustained depletion of CSF1R
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