title: Cdx4 and menin co-regulate Hoxa9 expression in hematopoietic cells.
abstract: BACKGROUND
  Transcription factor Cdx4 and transcriptional coregulator menin are essential for Hoxa9 expression and normal hematopoiesis. However, the precise mechanism underlying Hoxa9 regulation is not clear.
  
  
  RESULTS
  Here, we show that the expression level of Hoxa9 is correlated with the location of increased trimethylated histone 3 lysine 4 (H3K4M3). The active and repressive histone modifications co-exist along the Hoxa9 regulatory region. We further demonstrate that both Cdx4 and menin bind to the same regulatory region at the Hoxa9 locus in vivo, and co-activate the reporter gene driven by the Hoxa9 cis-elements that contain Cdx4 binding sites. Ablation of menin abrogates Cdx4 access to the chromatin target and significantly reduces both active and repressive histone H3 modifications in the Hoxa9 locus.
  
  
  CONCLUSIONS
  These results suggest a functional link among Cdx4, menin and histone modifications in Hoxa9 regulation in hematopoietic cells.
authors.affiliation: Abramson Family Cancer Research Institute, Department of Cancer Biology, Abramson Cancer Center, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America.
authors.forename: Jizhou
authors.initials: J
authors.lastname: Yan
authors.forename: Ya-Xiong
authors.initials: YX
authors.lastname: Chen
authors.forename: Angela
authors.initials: A
authors.lastname: Desmond
authors.forename: Albert
authors.initials: A
authors.lastname: Silva
authors.forename: Yuqing
authors.initials: Y
authors.lastname: Yang
authors.forename: Haoren
authors.initials: H
authors.lastname: Wang
authors.forename: Xianxin
authors.initials: X
authors.lastname: Hua
mesh_terms: D000818:Animals; D001483:Base Sequence; D001665:Binding Sites / Q000235:genetics; D002461:Cell Line, Transformed; D002843:Chromatin / Q000235:genetics / Q000378:metabolism; D004247:DNA / Q000235:genetics / Q000378:metabolism; D017930:Genes, Reporter; D006410:Hematopoiesis / Q000235:genetics* / Q000502:physiology; D006412:Hematopoietic Stem Cells / Q000378:metabolism*; D011495:Histone-Lysine N-Methyltransferase; D006657:Histones / Q000737:chemistry / Q000378:metabolism; D018398:Homeodomain Proteins / Q000235:genetics* / Q000378:metabolism*; D007942:Leukemia, Experimental / Q000235:genetics; D051379:Mice; D005810:Multigene Family; D016297:Mutagenesis, Site-Directed; D051788:Myeloid-Lymphoid Leukemia Protein / Q000235:genetics; D011518:Proto-Oncogene Proteins / Q000378:metabolism*; D012045:Regulatory Sequences, Nucleic Acid; D015533:Transcriptional Activation
chemical_list: C084563:Cdx4 protein, mouse; D002843:Chromatin; D006657:Histones; D018398:Homeodomain Proteins; C484898:Men1 protein, mouse; D011518:Proto-Oncogene Proteins; C097899:homeobox protein HOXA9; D051788:Myeloid-Lymphoid Leukemia Protein; D004247:DNA; D011495:Histone-Lysine N-Methyltransferase; C497423:Kmt2a protein, mouse