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Related Experiment Videos

Construct conversions caused by simultaneous co-transfection: "GFP-walking".

Felix Bestvater1, Tobias A Knoch, Jörg Langowski

  • 1Deutsches Krebsforschungszentrum, Heidelberg, Germany.

Biotechniques
|April 19, 2002
PubMed
Summary
This summary is machine-generated.

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Fluorescent protein chimeras can yield false positives due to spectral property conversion during co-transfection. This recombination-based event, occurring in up to 26% of cells, impacts multicolor labeling accuracy in vivo.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Multicolor labeling using Green Fluorescent Protein (GFP) variants is crucial for in vivo studies.
  • Simultaneous co-transfection of fluorescent protein chimeras is a common technique for multicolor labeling.

Purpose of the Study:

  • To investigate false-positive results arising from simultaneous co-transfection of fluorescent protein chimeras.
  • To elucidate the mechanism behind spectral property conversion in fluorescent fusion proteins.

Main Methods:

  • Simultaneous co-transfection of fluorescent protein chimeras in various cell types.
  • Analysis of spectral properties and protein expression under standard and varied transfection conditions.
  • Investigation of nucleotide sequence similarities and recombination events.

Related Experiment Videos

Main Results:

  • Co-transfection of fluorescent protein chimeras can lead to false-positive results due to spectral property conversion.
  • Approximately 8% of cells showed false positives, with up to 26% exhibiting permanent alterations.
  • The conversion mechanism involves homologous recombination/repair/replication events between fluorescent protein nucleotide sequences.
  • Consecutive transfection and reduced sequence similarity mitigated recombination.

Conclusions:

  • Spectral property conversion in fluorescent fusion proteins compromises multicolor labeling accuracy.
  • The observed conversion is a recombination-mediated process, independent of cell type or transfection method.
  • Understanding this conversion rate aids in studying recombination processes and developing more reliable in vivo labeling strategies.