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A Web-Based Workflow for Selecting Gene- and Tissue-Specific Enhancers
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Ultraconserved enhancer function does not require perfect sequence conservation.

Valentina Snetkova1, Athena R Ypsilanti2, Jennifer A Akiyama1

  • 1Environmental Genomics & System Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.

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Summary
This summary is machine-generated.

Ultraconserved enhancers, crucial for gene regulation, surprisingly resist mutations. This suggests their extreme sequence conservation may serve functions beyond known regulatory roles.

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Area of Science:

  • Genomics
  • Evolutionary Biology
  • Molecular Biology

Background:

  • Ultraconserved elements (UCEs) exhibit perfect sequence conservation across species, implying critical functions.
  • Existing models of enhancer function do not fully explain the extreme evolutionary constraint of UCEs.

Purpose of the Study:

  • To investigate the functional impact of mutations on ultraconserved enhancers.
  • To determine if the known regulatory activities of ultraconserved enhancers require perfect sequence conservation.

Main Methods:

  • Subjected 23 ultraconserved enhancers to extensive mutagenesis (1,547 mutations).
  • Assessed enhancer activity using transgenic mouse reporter assays.
  • Validated findings by replacing endogenous enhancers with mutated alleles in mice.

Main Results:

  • Most mutated enhancers (83%) retained enhancer activity at one developmental stage.
  • A significant proportion (56%) maintained function when tested later in development.
  • Transgenic assays and in vivo replacement experiments confirmed the robustness of ultraconserved enhancers to mutation.

Conclusions:

  • Ultraconserved enhancers demonstrate remarkable resilience to mutagenesis.
  • The high degree of sequence conservation in ultraconserved enhancers may be driven by functions beyond their currently understood regulatory roles.
  • Further research is needed to elucidate the full spectrum of functions contributing to ultraconserved enhancer constraint.