title: Control of vertebrate left-right asymmetry by a snail-related zinc finger gene.
abstract: A gene encoding a zinc finger protein of the Snail family, cSnR, is expressed in the right-hand lateral mesoderm during normal chick development. Antisense disruption of cSnR function during the hours immediately preceding heart formation randomized the normally reliable direction of heart looping and subsequent embryo torsion. Implanted ectopic sources of intercellular signal proteins that are involved in establishing normal left-right information randomized the handedness of heart development and also altered the asymmetry of cSnR expression. cSnR thus appears to act downstream of these signals, or perhaps in parallel with the latest expressed of them, the Nodal protein, in controlling the anatomical asymmetry.
authors.affiliation: National Institute for Medical Research, Mill Hill, London NW7 1AA, UK.
authors.forename: A
authors.initials: A
authors.lastname: Isaac
authors.forename: M G
authors.initials: MG
authors.lastname: Sargent
authors.forename: J
authors.initials: J
authors.lastname: Cooke
mesh_terms: D029404:Activin Receptors; D000595:Amino Acid Sequence; D000818:Animals; D019521:Body Patterning / Q000235:genetics*; D002642:Chick Embryo; D046508:Culture Techniques; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000235:genetics* / Q000502:physiology; D004627:Embryonic Induction / Q000235:genetics / Q000502:physiology; D018507:Gene Expression Regulation, Developmental; D006321:Heart / Q000196:embryology*; D053823:Hedgehog Proteins; D007979:Levocardia / Q000196:embryology / Q000235:genetics; D008648:Mesoderm / Q000378:metabolism*; D008969:Molecular Sequence Data; D055457:Nodal Protein; D016376:Oligonucleotides, Antisense; D011506:Proteins / Q000235:genetics / Q000502:physiology; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D017978:Receptors, Growth Factor / Q000235:genetics / Q000502:physiology; D000071250:Snail Family Transcription Factors; D019170:Somites / Q000378:metabolism; D015534:Trans-Activators; D016212:Transforming Growth Factor beta; D015854:Up-Regulation; D016335:Zinc Fingers / Q000235:genetics*
chemical_list: D004268:DNA-Binding Proteins; D053823:Hedgehog Proteins; D055457:Nodal Protein; D016376:Oligonucleotides, Antisense; D011506:Proteins; D012333:RNA, Messenger; D017978:Receptors, Growth Factor; D000071250:Snail Family Transcription Factors; D015534:Trans-Activators; D016212:Transforming Growth Factor beta; C104481:snail-related protein, Gallus gallus; D029404:Activin Receptors