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<p>Homeosis is classically defined as the transformation of one part of the body of animals into something resembling another part of the body. The transformation of the atlas into the trunk vertebra and the reverse process can also be considered homeotic. We analyzed standard X-ray and micro-tomographic pictures of the anterior part of the axial skeleton in 365 specimens of three species of the genus <i>Lissotriton</i> and found two anomalous newts (0.6%). A male <i>L. lantzi</i> had well-developed cervical ribs, while the female <i>L. schmidtleri</i> had only a small fragment instead of a rib on the left side of the first trunk vertebra. The occurrence of such anomalies is probably associated with the transfer of the development program of one vertebra to others located nearby. We hypothesized that such homeotic transformations could theoretically be linked to exposure to extreme water temperatures during early development and paedomorphosis, which together activate alternative pathways for the development of the axial skeleton.</p>

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What can anomalies of the axial skeleton of newts say about homeotic transformations?

  • 期刊论文

  • 发表日期：

    2025年1月4日

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  • Dmitriy V. Skorinov,
  • Daniel A. Melnikov,
  • Spartak N. Litvinchuk

摘要

Homeosis is classically defined as the transformation of one part of the body of animals into something resembling another part of the body. The transformation of the atlas into the trunk vertebra and the reverse process can also be considered homeotic. We analyzed standard X-ray and micro-tomographic pictures of the anterior part of the axial skeleton in 365 specimens of three species of the genus Lissotriton and found two anomalous newts (0.6%). A male L. lantzi had well-developed cervical ribs, while the female L. schmidtleri had only a small fragment instead of a rib on the left side of the first trunk vertebra. The occurrence of such anomalies is probably associated with the transfer of the development program of one vertebra to others located nearby. We hypothesized that such homeotic transformations could theoretically be linked to exposure to extreme water temperatures during early development and paedomorphosis, which together activate alternative pathways for the development of the axial skeleton.