title: Genomic profiling of mixer and Sox17beta targets during Xenopus endoderm development.
abstract: The transcription factors Mixer and Sox17beta have well-characterized roles in endoderm specification during Xenopus embryogenesis. In order to more thoroughly understand the mechanisms by which these endodermal regulators act, we expressed Mixer and Sox17beta in naïve ectodermal tissue and, using oligonucleotide-based microarrays, compared their genomic transcriptional profile to that of unaffected tissue. Using this approach, we identified 71 transcripts that are upregulated by Mixer or Sox17beta, 63 of which have previously uncharacterized roles in endoderm development. Furthermore, an in situ hybridization screen using antisense probes for several of these clones identified six targets of Mixer and/or Sox17beta that are expressed in the endoderm during gastrula stages, providing new and regional markers of the endoderm. Our results contribute further insight into the functions of Mixer and Sox17beta and bring us closer to understanding at the molecular level the pathways that regulate endoderm development.
authors.affiliation: Department of Genetics, Stanford University Medical School, Stanford, California 94062, USA.
authors.forename: Kari
authors.initials: K
authors.lastname: Dickinson
authors.forename: Jeff
authors.initials: J
authors.lastname: Leonard
authors.forename: Julie C
authors.initials: JC
authors.lastname: Baker
mesh_terms: D000818:Animals; D015415:Biomarkers; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D004625:Embryo, Nonmammalian / Q000196:embryology / Q000378:metabolism; D004707:Endoderm / Q000378:metabolism*; D020869:Gene Expression Profiling; D018507:Gene Expression Regulation, Developmental / Q000235:genetics; D023281:Genomics; D006609:High Mobility Group Proteins / Q000235:genetics / Q000378:metabolism*; D018398:Homeodomain Proteins / Q000235:genetics / Q000378:metabolism*; D019707:Receptors, Chemokine / Q000235:genetics; D055760:SOXF Transcription Factors; D013997:Time Factors; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D014158:Transcription, Genetic / Q000235:genetics; D029867:Xenopus Proteins / Q000235:genetics / Q000378:metabolism*; D014982:Xenopus laevis / Q000196:embryology* / Q000235:genetics* / Q000378:metabolism
chemical_list: D015415:Biomarkers; D004268:DNA-Binding Proteins; D006609:High Mobility Group Proteins; D018398:Homeodomain Proteins; D019707:Receptors, Chemokine; D055760:SOXF Transcription Factors; D014157:Transcription Factors; D029867:Xenopus Proteins; C405705:mixer protein, Xenopus; C491601:sox17b.1 protein, Xenopus