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A cry from the krill.

Gabriella M Mazzotta1, Cristiano De Pittà, Clara Benna

  • 1Dipartimento di Biologia, Università degli Studi di Padova, Padova, Italy.

Chronobiology International
|June 8, 2010
PubMed
Summary

Researchers identified a cryptochrome gene in Antarctic krill (Euphausia superba), a key species in the Southern Ocean. This finding suggests a potential internal clock mechanism to help krill adapt to seasonal light changes.

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Area of Science:

  • Marine Biology
  • Chronobiology
  • Molecular Genetics

Background:

  • Antarctic krill (Euphausia superba) face extreme seasonal environmental changes, including light and food availability.
  • Seasonal light variations significantly impact krill metabolism and physiology, acting as crucial environmental cues.
  • Understanding krill's adaptation mechanisms is vital for comprehending Southern Ocean ecosystem dynamics.

Purpose of the Study:

  • To identify and characterize a cryptochrome gene in Antarctic krill.
  • To investigate the presence of a circadian rhythm in Antarctic krill gene expression.
  • To explore the molecular basis for krill's adaptation to Antarctic light regimes.

Main Methods:

  • Gene identification and phylogenetic analysis of the cryptochrome gene (EsCRY).
  • Temporal expression analysis of EsCRY at both mRNA and protein levels.
  • Sampling of krill from the Ross Sea across a 24-hour cycle during Antarctic summer.

Main Results:

  • A cryptochrome gene, EsCRY, was identified and shown to be an ortholog of mammalian CRYs, clustering with insect CRY2.
  • EsCRY possesses a conserved N-terminal domain and a divergent C-terminus with unique binding motifs.
  • EsCRY mRNA levels exhibited daily fluctuations in krill heads, peaking around 06:00 h, but protein levels did not show a corresponding cycle.

Conclusions:

  • The study provides the first evidence for a potential endogenous circadian time-keeping mechanism in Antarctic krill.
  • This mechanism may enable krill to synchronize their physiology and behavior with fluctuating Antarctic light cycles.
  • Further research is needed to fully elucidate the role of EsCRY in krill's seasonal adaptation.