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Area of Science:

  • Marine biology
  • Environmental science
  • Molecular biology

Background:

  • Copper concentration in marine environments varies significantly, impacting phytoplankton growth.
  • Understanding copper transport mechanisms is crucial for marine species' survival and homeostasis.
  • Molecular mechanisms of copper transport in marine species remain largely unknown.

Purpose of the Study:

  • To investigate copper-responsive genes and uptake mechanisms in the marine diatom Thalassiosira oceanica.
  • To elucidate how T. oceanica acclimates to a wide range of environmentally relevant copper concentrations.
  • To identify specific copper transporters involved in maintaining copper homeostasis.

Main Methods:

  • Studied copper uptake rates in T. oceanica at varying copper concentrations (0.012 to 12,900 pmol Cu/L).
  • Identified and characterized four putative CTR-type copper transporter genes (ToCTR1, ToCTR2, ToCTR3a, ToCTR3b) from the diatom transcriptome.
  • Analyzed gene expression patterns in response to different copper levels and tested gene function in a copper transport mutant yeast model (Saccharomyces cerevisiae ctr1Δctr3Δ).

Main Results:

  • Demonstrated an inducible copper uptake pathway in T. oceanica, with uptake rates increasing significantly under copper limitation.
  • Identified ToCTR genes sharing conserved features with high-affinity copper(I) transporters.
  • Observed upregulation of CTR genes with decreasing copper concentrations, correlating with maintained growth rates; ToCTR3a/b restored growth and enhanced copper uptake in yeast mutants.

Conclusions:

  • ToCTR3a and ToCTR3b function as high-affinity copper(I) transporters in T. oceanica.
  • The identified ToCTR transporters collectively enable T. oceanica to survive in copper-depleted marine environments.
  • This molecular machinery allows the diatom to effectively respond to natural variations in copper availability, maintaining cellular homeostasis.