title: Expression of the sea urchin MyoD homologue, SUM1, is not restricted to the myogenic lineage during embryogenesis.
abstract: SUM1 (sea urchin myogenic factor 1) is a sea urchin homologue of the myogenic basic helix-loop-helix transcription factors of the MyoD family. SUM1 was initially cloned from Lytechinus variegatus where immunocytochemistry demonstrated restricted expression in precursors of the circumesophageal muscles, the only identified muscle cells in the early embryo. Subsequent in situ hybridization analysis indicates that SUM1 embryonic expression is not restricted to the myogenic lineage; a distinct population of nonmyogenic cells also expresses SUM1. For comparative purposes, we cloned the SUM1 orthologue in the distantly related sea urchin, Strongylocentrotus purpuratus, where we found SpSUM1 transcripts in the same population of nonmyogenic cells.
authors.affiliation: Department of Anatomy and Cell Biology, College of Physicians and Surgeons of Columbia University, 630 W. 168th Street, New York, NY 10032, USA.
authors.forename: R L
authors.initials: RL
authors.lastname: Beach
authors.forename: P
authors.initials: P
authors.lastname: Seo
authors.forename: J M
authors.initials: JM
authors.lastname: Venuti
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D051792:Basic Helix-Loop-Helix Proteins; D019070:Cell Lineage; D004625:Embryo, Nonmammalian; D004627:Embryonic Induction / Q000235:genetics; D018507:Gene Expression Regulation, Developmental; D018257:Helix-Loop-Helix Motifs / Q000235:genetics; D017403:In Situ Hybridization; D008969:Molecular Sequence Data; D024510:Muscle Development; D009132:Muscles / Q000196:embryology*; D017570:MyoD Protein / Q000235:genetics*; D012617:Sea Urchins / Q000196:embryology* / Q000235:genetics / Q000254:growth & development; D017386:Sequence Homology, Amino Acid; D014157:Transcription Factors / Q000235:genetics* / Q000378:metabolism
chemical_list: D051792:Basic Helix-Loop-Helix Proteins; D017570:MyoD Protein; D014157:Transcription Factors; C121967:SUM1 protein, sea urchin