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Creating Complex Fluorophore Spectra on Antibodies Through Combinatorial Labeling.

Hadassa Y Holzapfel1, Marc R Birtwistle1

  • 1Department of Pharmacology and Systems Therapeutics | Icahn School of Medicine at Mount Sinai | New York, NY, USA.

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|June 11, 2016
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Researchers developed a new method to label antibodies with multiple fluorescent dyes for enhanced multiplexing in biochemical assays. This technique utilizes fluorescence resonance energy transfer (FRET) with antibody fragments, enabling more colors in fluorescent measurements.

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Area of Science:

  • Biochemistry
  • Immunology
  • Analytical Chemistry

Background:

  • Fluorescently-labeled antibodies are crucial for various biochemical assays.
  • Current limitations restrict multiplexing to 3-4 colors due to spectral overlap.
  • Multiplexing enhancement is needed for more complex biological analyses.

Purpose of the Study:

  • To develop a method for labeling antibodies with multiple fluorophores exhibiting fluorescence resonance energy transfer (FRET).
  • To increase the multiplexing capacity of fluorescent antibody-based assays.
  • To explore the use of FRET for generating complex emission spectra for deconvolution.

Main Methods:

  • Utilized Biotium's Mix-n-Stain antibody labeling kits.
  • Employed antibody Fab fragments instead of full IgG molecules to achieve necessary fluorophore proximity for FRET.
  • Tested two FRET-capable fluorophore pairs: CF405M/CF488A and CF568/CF640R.

Main Results:

  • Successfully labeled antibody Fab fragments with multiple fluorophores capable of FRET.
  • Demonstrated observable FRET with the tested fluorophore combinations.
  • Validated the approach using specific FRET pairs, showing feasibility for increased multiplexing.

Conclusions:

  • Labeling antibody Fab fragments with multiple FRET-capable fluorophores is an effective strategy to enhance multiplexing.
  • This method provides a foundation for developing advanced fluorescent antibody measurements with higher color capacity.
  • Future work will focus on expanding this approach for broader applications in biochemical assays.