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The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
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The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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Updated: Aug 22, 2025

Chicken Recombinant Limbs Assay to Understand Morphogenesis, Patterning, and Early Steps in Cell Differentiation
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Gene expression changes during the evolution of the tetrapod limb.

Zsombor Varga1, Máté Varga2

  • 1Department of Genetics, ELTE Eötvös Loránd University, Budapest, Hungary.

Biologia Futura
|November 10, 2022
PubMed
Summary

Recent advances in genomics and developmental biology allow scientists to pinpoint genetic changes driving vertebrate limb evolution. This research sheds light on the evolutionary transition of tetrapods conquering land.

Keywords:
Evo-devoFin-to-limb transitionLimb developmentLimb evolutionTetrapod

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Area of Science:

  • Evolutionary biology
  • Developmental biology
  • Genomics

Background:

  • Vertebrate limb evolution is marked by significant anatomical changes, particularly during the transition to land and subsequent tetrapod radiation.
  • Conserved limb development mechanisms have been studied for a century using embryological and molecular approaches.

Purpose of the Study:

  • To identify and investigate the regulatory changes underlying tetrapod appendage evolution.
  • To leverage recent technological and data-driven advances to understand specific evolutionary transitions in limb morphology and function.

Main Methods:

  • Utilizing a broader range of genetic model species beyond traditional ones.
  • Employing predictive mathematical models for gene interaction networks.
  • Leveraging large-scale genomic data and high-throughput methodologies.
  • Applying these methods to diverse extant species.

Main Results:

  • Identification of specific mutations responsible for key transitions in limb evolution.
  • Gaining a detailed understanding of the regulatory changes that shaped tetrapod limbs.
  • Characterizing the evolutionary processes that enabled terrestrial locomotion in vertebrates.

Conclusions:

  • Modern techniques provide unprecedented resolution for studying the evolution of vertebrate limbs.
  • These advances are crucial for understanding the evolutionary history of tetrapods and their adaptations.
  • Continued application to extant species promises deeper insights into this consequential evolutionary transition.