Microglia and Myeloid Cell Populations of the Developing Mouse Retina
Sage Martineau1, Juan C Valdez-Lopez1, Samantha Zarnick1
1Departments of Neurobiology, Ophthalmology, and Cell Biology, Duke University School of Medicine, Durham, North Carolina, USA.
Glia
|December 13, 2025
Summary
Researchers identified distinct microglial populations in the developing mouse retina using single-cell RNA sequencing. These microglia, labeled by Spp1 and Hmox1 genes, engulf dying cells and interact with blood vessel development.
Area of Science:
- Neuroscience
- Developmental Biology
- Immunology
Background:
- Microglia are crucial for central nervous system (CNS) development, but their specific roles are not fully understood.
- The mouse retina is a valuable model for studying CNS assembly and microglial functions.
Purpose of the Study:
- To identify and characterize unique myeloid cell populations during retinal development.
- To understand the anatomical locations and molecular profiles of these developmental microglia.
Main Methods:
- Single-cell and single-nucleus RNA sequencing (scRNA-seq) across multiple developmental timepoints.
- In vivo validation using histological staining for RNA and protein markers.
- Analysis of transcriptional states related to NRF2 activity.
Main Results:
- Identified two distinct microglial populations (Spp1+ and Hmox1+) in the developing mouse retina.
- These microglia engulf neurons and astrocytes during developmental cell death.
- Hmox1+ microglia are associated with retinal angiogenesis, suggesting a link between vascular development and microglial state switching.
Conclusions:
- Defined novel transcriptional profiles for specific retinal microglial populations.
- Provided insights into microglial roles in developmental cell death and angiogenesis.
- Opened avenues for future research on microglial functions during CNS development.
