title: The heat stable antigen (mouse CD24) gene is differentially regulated but has a housekeeping promoter.
abstract: Expression of the mouse heat stable antigen (HSA or mouse CD24) shows tissue-specific as well as developmental regulation. During the maturation of several hematopoietic lineages, HSA expression is generally high in immature precursor cells and low or absent in terminally differentiated cells. We present evidence suggesting that this regulation of the HSA gene (Cd24a) occurs at the transcriptional level. In addition, sequence and methylation analysis of the Cd24a promoter revealed characteristics of both "housekeeping" and tissue-specific promoters, including a methylation-free, HpaII tiny fragment (HTF) island, multiple putative SP1 and AP-2 consensus binding sites, and a TATA box. Functional analysis of a 0.6-kilobase DNA fragment containing these elements fused to the CAT reporter gene in transient transfection experiments showed activity in both HSA expressing and non-expressing cell lines with a strength similar to that of the herpes-simplex virus-thymidine kinase promoter. Large fragments from the flanking region of the Cd24a promoter did not influence the ubiquitous nature of this promoter. Finally, we mapped the Cd24a, Cd24b, and Cd24c genes to mouse chromosomes 10, 8, and 14 respectively.
authors.affiliation: Max Planck Institut für Immunbiologie, Freiburg, Germany.
authors.forename: R H
authors.initials: RH
authors.lastname: Wenger
authors.forename: J M
authors.initials: JM
authors.lastname: Rochelle
authors.forename: M F
authors.initials: MF
authors.lastname: Seldin
authors.forename: G
authors.initials: G
authors.lastname: Köhler
authors.forename: P J
authors.initials: PJ
authors.lastname: Nielsen
mesh_terms: D000818:Animals; D015703:Antigens, CD / Q000235:genetics*; D001483:Base Sequence; D051927:CD24 Antigen; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D005786:Gene Expression Regulation; D005796:Genes; D008562:Membrane Glycoproteins; D008745:Methylation; D051379:Mice; D008969:Molecular Sequence Data; D011401:Promoter Regions, Genetic; D012333:RNA, Messenger / Q000235:genetics; D015183:Restriction Mapping; D014158:Transcription, Genetic
chemical_list: D015703:Antigens, CD; D051927:CD24 Antigen; C497890:Cd24a protein, mouse; D008562:Membrane Glycoproteins; D012333:RNA, Messenger