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The chicken retinoid-X-receptor-α (RXR-α) gene and its expression in the developing limb.

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Retinoic acid controls vertebrate limb development by influencing gene expression through retinoid receptors. This study identifies chicken RXR-alpha as a key receptor mediating anteroposterior patterning in chick wing buds.

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • Anteroposterior (a-p) patterning in vertebrate limb buds is regulated by signals from the polarizing region.
  • Retinoic acid, a signaling molecule, can induce polarizing region activity and alter limb patterning when applied to the anterior margin of chick wing buds.
  • Nuclear retinoid receptors, particularly those of the RXR class, are crucial for retinoic acid's effects on gene expression and development.

Purpose of the Study:

  • To isolate and characterize a chicken RXR-alpha cDNA clone.
  • To investigate the expression patterns of chicken RXR-alpha and RXR-gamma in various tissues, with a focus on the developing chick wing bud.
  • To determine the potential role of RXR-alpha and RXR-gamma in mediating retinoic acid's effects on anteroposterior patterning.

Main Methods:

  • Isolation and characterization of a chicken RXR-alpha cDNA clone.
  • Northern blotting to detect RXR-alpha mRNA expression in embryonic and adult chicken tissues.
  • In situ hybridization to localize RXR-alpha and RXR-gamma transcripts within the chick wing bud.

Main Results:

  • A chicken RXR-alpha cDNA clone was successfully isolated and characterized.
  • RXR-alpha mRNA (approximately 5 kb) was detected in multiple embryonic and adult chicken tissues.
  • RXR-alpha transcripts were abundant in both the epithelium and mesenchyme of chick wing buds during critical patterning stages.
  • RXR-gamma transcripts were primarily found in peripheral nervous tissue, not in the wing bud mesenchyme or epithelium.

Conclusions:

  • Chicken RXR-alpha is expressed in the chick wing bud during stages sensitive to retinoic acid signaling.
  • The expression pattern of RXR-alpha suggests it plays a significant role in mediating retinoic acid's effects on anteroposterior limb patterning.
  • Chicken RXR-gamma does not appear to be involved in this specific retinoid acid-mediated patterning process in the wing bud.