title: Msg1 and Mrg1, founding members of a gene family, show distinct patterns of gene expression during mouse embryogenesis.
abstract: Msg1 and Mrg1 are founding members of a gene family which exhibit distinct patterns of gene expression during mouse embryogenesis. Sequence analysis reveals that these genes are unlike any other gene identified to date, but they share two near-identical sequence domains. The Msg1 and Mrg1 expression profiles during early development are distinct from each other. Msg1 is predominantly expressed in nascent mesoderm, the heart tube, limb bud and sclerotome. Intriguingly, Msg1 expression is restricted, within these developing mesodermal sites, to posterior domains. Mrg1 is expressed prior to gastrulation in the anterior visceral endoderm. Expression is maintained in the endoderm once gastrulation has begun and commences in the rostralmost embryonic mesoderm which underlies the anterior visceral endoderm. Mrg1 expression persists in this rostral mesoderm as it is translocated caudalwards during the invagination of the foregut and the formation of the heart. Later Mrg1 expression predominates in the septum transversum caudal to the heart. This expression pattern suggests that the septum transversum originates from the rostralmost embryonic mesoderm which first expressed Mrg1 at the late primitive streak stage.
authors.affiliation: Mammalian Development, The National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK.
authors.forename: S L
authors.initials: SL
authors.lastname: Dunwoodie
authors.forename: T A
authors.initials: TA
authors.lastname: Rodriguez
authors.forename: R S
authors.initials: RS
authors.lastname: Beddington
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D051017:Apoptosis Regulatory Proteins; D001483:Base Sequence; D004268:DNA-Binding Proteins / Q000235:genetics*; D005314:Embryonic and Fetal Development / Q000235:genetics*; D018507:Gene Expression Regulation, Developmental; D006321:Heart / Q000196:embryology; D006801:Humans; D008648:Mesoderm / Q000378:metabolism; D051379:Mice; D008969:Molecular Sequence Data; D005810:Multigene Family / Q000235:genetics*; D009687:Nuclear Proteins / Q000235:genetics*; D012097:Repressor Proteins; D015534:Trans-Activators / Q000235:genetics*; D014157:Transcription Factors
chemical_list: D051017:Apoptosis Regulatory Proteins; C512688:CITED1 protein, human; C486381:CITED2 protein, human; C102208:Cited1 protein, mouse; C110087:Cited2 protein, mouse; D004268:DNA-Binding Proteins; D009687:Nuclear Proteins; D012097:Repressor Proteins; D015534:Trans-Activators; D014157:Transcription Factors