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Related Experiment Videos

An evolutionary link for developing mammalian lungs.

J E Maloney1, C Darian-Smith, B Russell

  • 1National Parks and Wildlife Service, Queensland, Australia.

Journal of Developmental Physiology
|September 1, 1989
PubMed
Summary
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Marine turtle embryonic lungs exhibit active ion transport, similar to mammals, suggesting an ancient evolutionary link in lung development. This research provides insights into the conserved mechanisms of lung maturation across species.

Area of Science:

  • Comparative Physiology
  • Developmental Biology
  • Evolutionary Biology

Background:

  • Mammalian lungs are fluid-filled before birth, with active ion transport in epithelial cells regulating this fluid.
  • Understanding the evolutionary origins of lung development mechanisms is crucial for comparative biology.

Purpose of the Study:

  • To investigate the presence of active ion transport in embryonic marine turtle lungs.
  • To explore potential evolutionary links between lung development in reptiles and mammals.

Main Methods:

  • Analysis of ionic composition (sodium, potassium, chloride) and protein in embryonic marine turtle lung liquid, amniotic fluid, and plasma.
  • Sampling conducted on turtle clutches incubated on Mon Repos beach, Queensland, Australia (1986-87).

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Main Results:

  • Active ion transport processes, similar to those in mammalian lungs, were identified in developing marine turtle lungs.
  • Evidence suggests partial reabsorption of lung liquid in marine turtles before hatching.
  • Ionic concentrations and protein levels indicate active fluid regulation.

Conclusions:

  • The findings support the presence of conserved lung development processes in both marine reptiles and mammals.
  • Active ion transport mechanisms in embryonic lungs appear to be evolutionarily conserved.
  • This suggests an ancient evolutionary counterpart controlling hollow lung development across diverse species.