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Updated: Jun 20, 2026

Directed Differentiation of Primitive and Definitive Hematopoietic Progenitors from Human Pluripotent Stem Cells
Published on: November 1, 2017
WNT signaling in human pluripotent stem cells promotes HDAC2-dependent epigenetic programs and development of
Bao Q Thai1, Elizabeth J Sargent1, Stephanie A Luff2
1Department of Immunobiology, University of Arizona College of Medicine, Tucson, AZ 85724, USA.
Abstract:
Human pluripotent stem cells (hPSCs) can be used as a scalable source of lymphocytes for adoptive cell therapies, contingent on the robust generation of definitive hematopoietic intermediates. Early WNT activation with CHIR99021 during mesoderm induction promoted the formation of KDR+ ALDH1A2+ mesoderm, which is essential for subsequent generation of T cells in a retinoic acid (RA)-dependent manner. Integrated scRNA-seq and ATAC-seq defined a WNT-dependent developmental trajectory from hPSCs to KDR+ ALDH1A2+ mesoderm. Gene regulatory network modeling predicted HDAC2 and E-box transcription factors as regulators of RA-responsive mesodermal differentiation downstream of WNT. HDAC2 knockout impaired, while HDAC2 overexpression enhanced KDR+ ALDH1A2+ mesoderm formation. E-box factor manipulation had no discernible effect. An orthogonal chemical screen confirmed that HDAC2 inhibition suppressed KDR+ ALDH1A2+ mesoderm, whereas modulating histone methylation enhanced their formation. These findings reveal mechanisms by which WNT signaling promotes RA-responsive mesoderm, and they suggest methods to improve the generation of lymphocytes from hPSCs.
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