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A regulatory 'landscape effect' over the HoxD cluster.
Patrick Tschopp1, Denis Duboule
1National Research Centre-Frontiers in Genetics, Department of Zoology and Animal Biology, University of Geneva, Sciences III, Quai Ernest-Ansermet 30, Geneva, Switzerland.
Developmental Biology
|January 4, 2011
Summary
Altering HoxD gene regulation reveals a novel
Area of Science:
- Developmental biology
- Genetics
- Genomics
Background:
- Hox genes are crucial for body axis patterning, with expression regulated by gene cluster-autonomous and long-range enhancer mechanisms.
- Recent findings suggest trunk gene activation may involve signals outside the Hox gene cluster, challenging the established regulatory dichotomy.
Purpose of the Study:
- To investigate alternative regulatory strategies for HoxD gene expression.
- To determine the impact of the centromeric landscape on HoxD gene regulation and expression fine-tuning.
Main Methods:
- Engineered a large inversion to separate the murine HoxD complex from its centromeric neighborhood.
- Analyzed mutant animals for posterior transformations and Hoxd gene deregulation.
Main Results:
- Mutant animals exhibited posterior transformations, indicating disruptions in body axis patterning.
- Subtle deregulations in Hoxd gene expression were observed, highlighting the influence of the centromeric landscape.
- Proximal limb development was affected, suggesting a broad impact of this regulatory effect.
Conclusions:
- The centromeric landscape significantly influences the fine-tuning of HoxD gene expression.
- This 'landscape effect' is a generic regulatory mechanism impacting diverse evolutionary origins of gene regulation.
- Findings challenge the strict gene cluster-autonomous model and emphasize the role of extragenic regions in Hox gene regulation.
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