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Updated: Jun 18, 2026
11:13
Stem cell-like Xenopus Embryonic Explants to Study Early Neural Developmental Features In Vitro and In Vivo
Published on: February 2, 2016
Direct Reciprocal Repression between Goosecoid and Ventx1.1 Modulates Dorsoventral Patterning in Xenopus
Basant Kumar1, Zobia Umair2, Seung-Hwan Lee1
1Department of Biochemistry, Institute of Cell Differentiation and Ageing, College of Medicine, Hallym University, Chuncheon, Gangwon-Do, 24252, Republic of Korea.
Differentiation; Research in Biological Diversity
|June 16, 2026
Summary
Goosecoid (Gsc) and Ventx1.1 genes in Xenopus embryos establish a reciprocal repression circuit via their promoters. This mechanism refines dorsoventral patterning during gastrulation, with Foxd4l1.1 adding further transcriptional control.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- Precise embryonic development relies on coordinated gene regulation.
- Dorsoventral patterning in Xenopus embryos involves antagonistic genes like Goosecoid (Gsc) and Ventx1.1.
- The cis-regulatory mechanisms behind Gsc and Ventx1.1 reciprocal repression were previously undefined.
Purpose of the Study:
- To elucidate the cis-regulatory basis of reciprocal repression between Gsc and Ventx1.1.
- To identify specific DNA elements involved in this gene interaction.
- To understand the contribution of this circuit to Xenopus embryonic patterning.
Main Methods:
- Serial promoter deletions and site-directed mutagenesis in Xenopus.
- Luciferase reporter assays to quantify gene repression.
- Chromatin immunoprecipitation (ChIP) to assess in vivo binding.
Main Results:
- Identified a Goosecoid response element (GRE) in the ventx1.1 promoter and Ventx1.1 response elements (VREs) in the gsc promoter.
- Mutating these elements significantly reduced reciprocal repression.
- Foxd4l1.1 was found to repress gsc transcription, adding regulatory complexity.
Conclusions:
- A promoter-level reciprocal repression circuit exists between Gsc and Ventx1.1.
- This circuitry is crucial for refining dorsoventral patterning in Xenopus gastrulae.
- Additional transcription factors like Foxd4l1.1 contribute to precise spatial gene expression control.
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