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Resurrection of Dormant Daphnia magna: Protocol and Applications
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Tracing whale myoglobin evolution by resurrecting ancient proteins.

Yasuhiro Isogai1, Hiroshi Imamura2, Setsu Nakae3

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Ancestral whale myoglobin (Mb) evolved two strategies for deep diving adaptation. Early evolution increased precipitant tolerance, while later stages enhanced folding stability for higher protein concentration.

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Area of Science:

  • Evolutionary biology
  • Molecular biology
  • Biochemistry

Background:

  • Cetaceans evolved deep-diving abilities from terrestrial ancestors over 50 million years.
  • Myoglobin (Mb) concentration is higher in diving mammals, suggesting a role in oxygen storage (molecular aqualung).

Purpose of the Study:

  • To investigate the evolutionary adaptations of myoglobin in whale deep-sea diving.
  • To resurrect and analyze ancestral whale myoglobin (Mb) proteins.

Main Methods:

  • Resurrection of ancestral myoglobin (Mb) proteins from Basilosaurus and Pakicetus.
  • Experimental and theoretical analyses of protein properties.

Main Results:

  • Whale myoglobin (Mb) employed distinct evolutionary strategies for deep-diving adaptation.
  • Early evolutionary phase: increased precipitant tolerance.
  • Late evolutionary phase: enhanced folding stability.

Conclusions:

  • Whale myoglobin (Mb) evolved enhanced protein concentration through two distinct strategies.
  • These adaptations facilitated the transition from terrestrial to deep-sea diving lifestyles.