{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,6]],"date-time":"2026-11-06T04:32:18Z","timestamp":1793939538173,"version":"4.8.0"},"reference-count":66,"publisher":"American Society of Hematology","issue":"19","license":[{"start":{"date-parts":[[2026,8,6]],"date-time":"2026-08-06T00:00:00Z","timestamp":1785974400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":["ashpublications.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2026,11,5]]},"abstract":"<jats:sec>\n                    <jats:title>Abstract<\/jats:title>\n                    <jats:p>Ex vivo expansion of human hematopoietic stem cells (HSCs) holds promise for overcoming their limited availability, which is a major barrier to their broader clinical application. Although recent advances in culture systems may increase HSC numbers, these conditions frequently impair self-renewal and induce myeloid bias, and the underlying molecular mechanisms remain poorly understood. Here, we performed single-cell multiome sequencing (scMultiome-seq) on human umbilical cord blood-derived CD34+ hematopoietic stem and progenitor cells (HSPCs) to coprofile transcriptional and epigenetic adaptations within the same cells during ex vivo culture. Our analyses revealed reduced transcriptional and epigenetic HSC signatures, accompanied by markedly increased activity of myeloid-associated transcription factor motifs, providing molecular insight into the functional decline and myeloid bias of cultured HSCs. We further observed substantial functional heterogeneity among phenotypically defined HSCs after culture. To address these limitations, we established a niche-mimetic culture system that integrates intrinsic and extrinsic bone marrow regulatory cues, including pharmacologic inhibition of the m6A reader YTHDF2 using the small molecule Y13-27, a 3-dimensional (3D) microenvironment, and N-cadherin-mediated adhesion. This condition (3D-NcadP-Y) robustly preserved long-term repopulating capacity. When combined with the self-renewal agonist UM729, the resulting platform (3D-NcadP-Y-UM) uniquely enabled the expansion of serially transplantable long-term HSCs with balanced multilineage potential. scMultiome-seq and cellular analyses demonstrated that this condition preserves transcriptional and epigenetic long-term HSC signatures, maintains multilineage-associated transcription factor motifs, and limits excessive cell cycle activation. Together, these findings elucidate the molecular mechanisms underlying culture-induced HSC dysfunction and establish a niche-mimetic strategy for expanding functional human long-term HSCs while preserving key features of stemness.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1182\/blood.2026034240","type":"journal-article","created":{"date-parts":[[2026,8,6]],"date-time":"2026-08-06T19:20:11Z","timestamp":1786044011000},"page":"2338-2353","update-policy":"https:\/\/doi.org\/10.1182\/blood.2019cm0000","source":"Crossref","is-referenced-by-count":1,"title":["Expansion of functional human long-term HSCs through restraining excessive cell cycle activation"],"prefix":"10.1182","volume":"148","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5258-6056","authenticated-orcid":false,"given":"Xinjian","family":"Mao","sequence":"first","affiliation":[{"name":"1Stowers Institute for Medical Research, Kansas City, 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