CD200R1 Marks a Branchpoint During Human Natural Killer Cell Development in Tonsils

CD200R1 expression distinguishes two stage 4A subsets of tonsil CD94/NKG2A+ NKp80− NK-cell development intermediates, marking an immature branchpoint with oligopotent potential.

• Why it matters: Human NK differentiation in secondary lymphoid tissues proceeds through lineage-restricted intermediates, but markers that separate uncommitted from more restricted states are limited.
• What they did: Using ex vivo single-cell transcriptomics plus DNA methylation, phenotyping, and functional assays, the study compared CD200R1+ versus CD200R1− stage 4A cells in human tonsils.
• The result: CD200R1+ stage 4A cells are linked to tissue-resident and cytokine-responsive programs and immature oligopotency, whereas CD200R1− stage 4A cells show more restricted developmental potential with mature-like features.

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