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Title 

Negative regulation of Activin/Nodal signaling by SRF during Xenopus gastrulation

Authors 

Chang Hyun YunS C ChoiE ParkS J KimA S ChungHyeong Kyu LeeHo Jae LeeJ K Han

Publisher 

Company of Biologists

Issue Date 

2007

Citation 

Development, vol. 134, no. 4, pp. 769-777

Keywords 

Activin and Nodal signalinggerm-layer formationSRFxenopusactivinprotein Nodalgastrulationactivinsxenopus proteins

Abstract 

Activin/Nodal signaling is essential for germ-layer formation and axial patterning during embryogenesis. Recent evidence has demonstrated that the intra- or extracellular inhibition of this signaling is crucial for ectoderm specification and correct positioning of mesoderm and endoderm. Here, we analyzed the function of Xenopus serum response factor (XSRF) in establishing germ layers during early development. XSRF transcripts are restricted to the animal pole ectoderm in Xenopus early embryos. Ectopic expression of XSRF RNA suppresses mesoderm induction, both in the marginal zone in vivo and caused by Activin/Nodal signals in animal caps. Dominant-negative mutant or antisense morpholino oligonucleotide-mediated inhibition of XSRF function expands the expression of mesendodermal genes toward the ectodermal territory and enhances the inducing activity of the Activin signal. SRF interacts with Smad2 and FAST-1, and inhibits the formation of the Smad2-FAST-1 complex induced by Activin. These results suggest that XSRF might act to ensure proper mesoderm induction in the appropriate region by inhibiting the mesoderm-inducing signals during early embryogenesis.

ISSN 

0950-1991

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2019-05-02


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