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Sibling chimerism among microglia in marmosets.

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Marmoset chimerism, common in these primates due to fused circulatory systems, affects organs via blood-derived cells. Microglia in the brain show sibling-derived chimerism, offering insights into brain cell function.

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Area of Science:

  • Developmental Biology
  • Immunology
  • Neuroscience

Background:

  • Chimerism is rare in mammals but common in marmosets due to fused circulatory systems during twin/triplet development.
  • Previous observations of Y-chromosome DNA in female marmoset organs suggested widespread chimerism, but the cell types involved remained unclear.

Approach:

  • Analyzed single-cell RNA sequencing data from marmoset blood, liver, kidney, and brain tissues.
  • Utilized transcribed single nucleotide polymorphisms (SNPs) to identify sibling-derived cells across various tissue types.
  • Quantified chimerism in hematopoietic cells, microglia, macrophages, and other brain-resident cells.

Key Points:

  • Sibling-derived chimerism across all analyzed tissues originated exclusively from hematopoietic cells (myeloid and lymphoid lineages).
  • In the brain, chimerism was observed in microglia and macrophages, but not in neurons, glia, or ependymal cells.
  • Microglial chimerism varied significantly across brain regions, suggesting localized responses or clonal expansion.

Conclusions:

  • Naturally occurring marmoset chimerism provides a unique model to study the influence of genes, mutations, and brain environment on microglial biology.
  • This model allows for the differentiation of microglial contributions versus other cell types in shaping brain phenotypes.
  • Microglial gene expression is more influenced by local context than by sibling genetic differences.