PuSH - Publication Server of Helmholtz Zentrum München: Ly6D+Siglec-H+ precursors contribute to conventional dendritic cells via a Zbtb46+Ly6D+ intermediary stage.

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Lutz, K.* ; Musumeci, A.* ; Sie, C.* ; Dursun, E.* ; Winheim, E.* ; Bagnoli, J.* ; Ziegenhain, C.* ; Rausch, L.* ; Bergen, V. ; Luecken, M. ; Oostendorp, R.A.J.* ; Schraml, B.U.* ; Theis, F.J. ; Enard, W.* ; Korn, T.* ; Krug, A.B.*

Ly6D⁺Siglec-H⁺ precursors contribute to conventional dendritic cells via a Zbtb46⁺Ly6D⁺ intermediary stage.

Nat. Commun. 13:3456 (2022)

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Plasmacytoid and conventional dendritic cells (pDC and cDC) are generated from progenitor cells in the bone marrow and commitment to pDCs or cDC subtypes may occur in earlier and later progenitor stages. Cells within the CD11c⁺MHCII^-/loSiglec-H⁺CCR9^lo DC precursor fraction of the mouse bone marrow generate both pDCs and cDCs. Here we investigate the heterogeneity and commitment of subsets in this compartment by single-cell transcriptomics and high-dimensional flow cytometry combined with cell fate analysis: Within the CD11c⁺MHCII^-/loSiglec-H⁺CCR9^lo DC precursor pool cells expressing high levels of Ly6D and lacking expression of transcription factor Zbtb46 contain CCR9^loB220^hi immediate pDC precursors and CCR9^loB220^lo (lo-lo) cells which still generate pDCs and cDCs in vitro and in vivo under steady state conditions. cDC-primed cells within the Ly6D^hiZbtb46^- lo-lo precursors rapidly upregulate Zbtb46 and pass through a Zbtb46⁺Ly6D⁺ intermediate stage before acquiring cDC phenotype after cell division. Type I IFN stimulation limits cDC and promotes pDC output from this precursor fraction by arresting cDC-primed cells in the Zbtb46⁺Ly6D⁺ stage preventing their expansion and differentiation into cDCs. Modulation of pDC versus cDC output from precursors by external factors may allow for adaptation of DC subset composition at later differentiation stages.

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