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Breaking colinearity in the mouse HoxD complex.

T Kondo1, D Duboule

  • 1Department of Zoology and Animal Biology, University of Geneva, Sciences III, Switzerland.

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Summary
This summary is machine-generated.

Vertebrate Hox genes exhibit spatiotemporal activation reflecting their clustered organization. A newly identified regulatory element upstream of the HoxD complex is crucial for establishing this early collinear activation pattern.

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Area of Science:

  • Developmental Biology
  • Genetics
  • Molecular Biology

Background:

  • Vertebrate Hox genes are crucial for establishing anterior-posterior body patterning.
  • Hox gene activation occurs in a spatiotemporal sequence mirroring their genomic cluster organization (colinearity).
  • The molecular mechanisms governing this precise spatiotemporal activation remain largely unknown.

Purpose of the Study:

  • To investigate the regulatory mechanisms underlying the spatiotemporal activation of vertebrate Hox genes.
  • To identify potential regulatory elements responsible for initiating and maintaining Hox gene colinearity.

Main Methods:

  • Genomic walking combined with successive transgene insertions upstream of the HoxD complex.
  • Generation of a series of deletions within the identified upstream region.
  • Analysis of Hox gene activation patterns and phenotypic consequences (homeotic transformations).

Main Results:

  • A significant deficiency upstream of the HoxD complex induced posterior homeotic transformations.
  • This deficiency also resulted in an earlier activation of Hoxd genes.
  • These findings pinpoint a regulatory element essential for early Hox gene activation patterning.

Conclusions:

  • A regulatory element located upstream of the HoxD complex plays a critical role in establishing the early spatiotemporal colinear activation of Hox genes.
  • This element appears to be involved in initiating a repressive conformation that is sequentially relieved.
  • Understanding this mechanism provides insight into fundamental principles of vertebrate development and gene regulation.