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Titolo:
her1, a zebrafish pair-rule like gene, acts downstream of notch signallingto control somite development
Autore:
Takke, C; Campos-Ortega, JA;
Indirizzi:
Univ Cologne, Inst Entwicklungsbiol, D-50923 Cologne, Germany Univ Cologne Cologne Germany D-50923 lungsbiol, D-50923 Cologne, Germany
Titolo Testata:
DEVELOPMENT
fascicolo: 13, volume: 126, anno: 1999,
pagine: 3005 - 3014
SICI:
0950-1991(199907)126:13<3005:HAZPLG>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPLIT COMPLEX GENES; XENOPUS-EMBRYOS; DROSOPHILA-MELANOGASTER; PRIMARY NEUROGENESIS; LATERAL INHIBITION; TRANSCRIPTIONAL ACTIVATION; EARLY EMBRYOGENESIS; PRONEURAL GENES; PRIMARY NEURONS; DELTA-HOMOLOG;
Keywords:
her1; NOTCH signalling; somitogenesis; zebrafish;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
53
Recensione:
Indirizzi per estratti:
Indirizzo: Campos-Ortega, JA Univ Cologne, Inst Entwicklungsbiol, D-50923 Cologne, Germany Univ Cologne Cologne Germany D-50923 Cologne, Germany
Citazione:
C. Takke e J.A. Campos-Ortega, "her1, a zebrafish pair-rule like gene, acts downstream of notch signallingto control somite development", DEVELOPMENT, 126(13), 1999, pp. 3005-3014

Abstract

During vertebrate embryonic development, the paraxial mesoderm becomes subdivided into metameric units known as somites. In the zebrafish embryo, genes encoding homologues of the proteins of the Drosophila NOTCH signalling pathway are expressed in the presomitic mesoderm and expression is maintained in a segmental pattern during somitogenesis, This expression pattern suggests a role for these genes during somite development. We misexpressed various zebrafish genes of this group by injecting mRNA into early embryos. RNAencoding a constitutively active form of NOTCH1a (notch1a-intra) and a truncated variant of deltaD [deltaD((Pst))], as well as transcripts of deltaC and deltaD, the hairy-E(spl) homologues her1 and her4, and groucho2 were tested for their effects on somite formation, myogenesis and on the pattern of transcription of putative downstream genes. In embryos injected with any of these RNAs, with the exception of groucho2 RNA, the paraxial mesoderm differentiated normally into semitic tissue, but failed to segment correctly. Activation of NOTCH results in ectopic activation of her1 and her4. This misregulation of the expression of her genes might be causally related to the observed mesodermal defects, as her1 and her4 mRNA injections led to effects similar to those seen with notch1a-intra, deltaC and deltaD seem to function after subdivision of the presomitic mesoderm, since the her gene transcription pattern in the presomitic mesoderm remains essentially normal after misexpression of delta genes. Whereas NOTCH Signalling alone apparently does not affect myogenesis, zebrafish groucho2 is involved in differentiation of mesodermal derivatives.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 15/07/20 alle ore 20:12:07