Expansion of human hematopoietic stem cells by inhibiting translation

Translation initiation inhibition with 4E1RCat enables ~4.3-fold expansion of long-term human HSCs from umbilical cord blood after one week in low-cytokine culture.

• Why it matters: Umbilical cord blood has too few HSCs for transplantation, and ex vivo manipulation can impair HSCs, complicating gene editing for inherited blood disorders.
• What they did: A high-throughput screen identified translation inhibitors that support cytokine-minimized expansion; transplantation assays and single-cell transcriptomics assessed long-term HSC function and stress programs.
• The result: Low-cytokine conditions maintaining or expanding functional long-term HSCs preserve HSC/MPP transcriptional signatures and reduce stress markers, and they support adult HSC maintenance after CRISPR/Cas9 editing of the BCL11A+58 enhancer.

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