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Summary

The study reveals that the sonic hedgehog (Shh) limb bud enhancer (ZRS) functions through distinct activity domains. Its composition integrates discrete regulatory activities and redundant sequences for robust gene expression control.

Keywords:
HoxD genesShh expressionWerner mesomelic syndromeZRSenhancergenome editinglimb developmentphenotypepolydactyly

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Area of Science:

  • Developmental Biology
  • Genetics
  • Evolutionary Biology

Background:

  • Sonic hedgehog (Shh) is crucial for limb bud development.
  • The zone of polarizing activity regulatory sequence (ZRS) controls Shh expression.
  • ZRS is an ancient, conserved cis-regulator across vertebrates.

Purpose of the Study:

  • To investigate the relationship between ZRS composition and embryonic phenotype using genome editing.
  • To understand how enhancer activity is structured and regulated.

Main Methods:

  • Utilized genome editing in mice to study the endogenous ZRS.
  • Analyzed enhancer activity domains and their impact on gene expression.

Main Results:

  • Identified distinct activity domains within the ZRS enhancer.
  • Discovered a repressor module for spatial Shh expression restriction.
  • Showed HOXD binding sites control incremental gene expression levels.
  • Found significant sequence redundancy within the conserved ZRS.

Conclusions:

  • Enhancer activity is a collective function of discrete domains and redundant components.
  • This model explains robust Shh expression during limb development.
  • The findings provide insights into cis-regulatory element evolution and function.