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Zic3 represses anterior digit development in tetrapods.

Shan-Shan Li1, Shi-Bin Bai1, Xiao-Fei Sun2

  • 1College of Animal Science and Veterinary Medicine, Shenyang Agricultural University, Shenyang, Liaoning 110866, China.

Zoological Research
|May 23, 2025
PubMed
Summary
This summary is machine-generated.

The gene Zic3 inhibits skeletal development in the anterior limb buds of tetrapods. This discovery reveals Zic3

Keywords:
Anterior digitsLimb developmentTetrapodTranscriptomeZic3

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Area of Science:

  • Developmental biology
  • Evolutionary biology
  • Genetics

Background:

  • Pentadactyl limbs are a hallmark of tetrapods, with anterior digits crucial for fine motor skills.
  • Posterior digit development is understood, but anterior digit formation, particularly digit I, is less clear.
  • Understanding limb asymmetry is key to evolutionary developmental biology.

Purpose of the Study:

  • To investigate the regulatory mechanisms of anterior digit development in tetrapods.
  • To identify novel genes involved in the anterior-posterior axis patterning of limbs.
  • To elucidate the role of Zic3 in skeletal development and limb asymmetry.

Main Methods:

  • Comparative analysis of limb bud gene expression across representative tetrapods.
  • Zic3 gene overexpression experiments in limb bud models.
  • RNA sequencing to identify downstream target genes of Zic3.
  • Histological analysis of skeletal development.

Main Results:

  • Zic3 exhibits conserved anterior expression in tetrapod limb buds.
  • Zic3 overexpression delays chondrogenesis and ossification, causing bone shortening.
  • Zic3 down-regulates key skeletal development genes like Sox9, Runx2, and Wnt16.
  • Zic3 acts as a conserved inhibitor of anterior skeletal maturation.

Conclusions:

  • Zic3 is a novel conserved inhibitor of anterior skeletal maturation in tetrapod limbs.
  • Zic3 contributes to the molecular asymmetry observed in tetrapod limb development.
  • These findings provide insights into the genetic basis of limb evolution and patterning.