An autoregulatory element of the murine Hox-4.2 gene.
Hox-4.2 promoter activity was assayed by transient expression assays in P19 embryonal carcinoma (EC) cells. Cotransfection of a luciferase reporter gene construct driven by Hox-4.2 upstream sequences with an expression vector for the Hox-4.2 gene product resulted in a 20-fold increase in luciferase activity. This activity was specific in that the Hox-1.6 gene product had no effect in the same assay. Mutational analysis defined a cis-acting element with enhancer function which conferred most of this increase. Activation was largely dependent on two TAAT/ATTA motifs within this 217 bp fragment and HOX-4.2 bound specifically to both of these motifs. The 217 bp element maps within a highly conserved region of the human Hox-4.2 gene (HOX4B) which has been shown to display spatial enhancer activity in mice and flies. These findings suggest a conserved autoregulatory mechanism for the control of Hox-4.2 expression.
Pöpperl
H
H
McGill Cancer Centre, Montréal, Québec, Canada.
Featherstone
M S
MS
D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D002467:Cell Nucleus / Q000378:metabolism; D015870:Gene Expression; D005801:Genes, Homeobox; D006801:Humans; D008156:Luciferases / Q000235:genetics / Q000378:metabolism; D051379:Mice; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D009838:Oligodeoxyribonucleotides; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D012045:Regulatory Sequences, Nucleic Acid; D015183:Restriction Mapping; D012689:Sequence Homology, Nucleic Acid; D013724:Teratoma; D014162:Transfection
D009838:Oligodeoxyribonucleotides; D011993:Recombinant Fusion Proteins; D008156:Luciferases