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pubmed-article:11901201pubmed:abstractTextThe rae28 gene (rae28), also designated as mph1, is a mammalian ortholog of the Drosophila polyhomeotic gene, a member of Polycomb group genes (PcG). rae28 constitutes PcG complex 1 for maintaining transcriptional states which have been once initiated, presumably through modulation of the chromatin structure. Hematopoietic activity was impaired in the fetal liver of rae28-deficient animals (rae28-/-), as demonstrated by progressive reduction of hematopoietic progenitors of multilineages and poor expansion of colony forming units in spleen (CFU-S(12)) during embryonic development. An in vitro long-term culture-initiating cell assay suggested a reduction in hematopoietic stem cells (HSCs), which was confirmed in vivo by reconstitution experiments in lethally irradiated congenic recipient mice. The competitive repopulating units (CRUs) reflect HSCs supporting multilineage blood-cell production. CRUs were generated, whereas the number of CRUs was reduced by a factor of 20 in the rae28-/- fetal liver. We also performed serial transplantation experiments to semiquantitatively measure self-renewal activity of CRUs in vivo. Self-renewal activity of CRUs was 15-fold decreased in rae28-/-. Thus the compromised HSCs were presumed to reduce hematopoietic activity in the rae28-/- fetal liver. This is the first report to suggest that rae28 has a crucial role in sustaining the activity of HSCs to maintain hematopoiesis.lld:pubmed
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pubmed-article:11901201pubmed:authorpubmed-author:AkihisaSawada...lld:pubmed
pubmed-article:11901201pubmed:authorpubmed-author:TokimasaSadao...lld:pubmed
pubmed-article:11901201pubmed:authorpubmed-author:OhtaHideakiHlld:pubmed
pubmed-article:11901201pubmed:authorpubmed-author:KimJi YooJYlld:pubmed
pubmed-article:11901201pubmed:authorpubmed-author:HaraJunichiJlld:pubmed
pubmed-article:11901201pubmed:authorpubmed-author:NishiguchiSei...lld:pubmed
pubmed-article:11901201pubmed:authorpubmed-author:TakiharaYoshi...lld:pubmed
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pubmed-article:11901201pubmed:pagination759-70lld:pubmed
pubmed-article:11901201pubmed:dateRevised2009-11-18lld:pubmed
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pubmed-article:11901201pubmed:articleTitlePolycomb group gene rae28 is required for sustaining activity of hematopoietic stem cells.lld:pubmed
pubmed-article:11901201pubmed:affiliationDepartment of Developmental Biology and Medicine, Osaka Medical Center for Cancer and Cardiovascular Diseases, 3-3 Nakamichi-1, Higashinari, Osaka 537-8511, Japan.lld:pubmed
pubmed-article:11901201pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:11901201pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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