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Time-sequenced transcriptomes of developing distal mouse limb buds: A comparative tissue layer analysis.

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Developmental Dynamics : an Official Publication of the American Association of Anatomists
|July 13, 2021
PubMed
Summary

Researchers mapped gene expression in developing amniote limbs to uncover key developmental shifts. This study reveals a major transcriptional transition in limb buds, crucial for understanding limb patterning and morphogenesis.

Keywords:
AERHox genesRNA-seqlimb patterninglimb progenitorssignalingtranscriptome

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Area of Science:

  • Developmental Biology
  • Genomics
  • Molecular Biology

Background:

  • Amniote limb development is a key model for studying morphogenesis and patterning.
  • Proper limb growth relies on interactions between distal mesenchyme and the apical ectodermal ridge (AER).
  • These interactions involve coordinated, tissue-specific genetic programs.

Purpose of the Study:

  • To analyze transcriptomes of distal limb mesenchymal progenitors and ectodermal cells during development.
  • To identify specific transcriptional signatures and signaling pathways involved in limb development.
  • To uncover previously unrecognized roles of genes in limb patterning.

Main Methods:

  • Time-coursed dissections of limb buds from initiation to full patterning.
  • Transcriptome sequencing and comparative analysis of mesenchymal and ectodermal cell layers.
  • Identification of stage-specific gene expression patterns and enriched signaling pathways.

Main Results:

  • Transcriptomic signatures for distinct developmental stages were identified.
  • Specific genes with potential roles in limb development were highlighted.
  • Enriched signaling pathways between interacting cell layers were discovered.

Conclusions:

  • A major transcriptional transition occurs in distal limb buds between embryonic days 9.5 and 10.5.
  • This transition marks a shift from initial proximo-distal specification to an intrinsic developmental phase.
  • The findings provide insights into the genetic programs governing amniote limb development.