Goat Anti-tdTomato, DyLight® 405 Polyclonal IgG Antibody: A Comprehensive Guide

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Introduction

Fluorescent proteins and their corresponding antibodies are essential tools in modern biological research. The Goat Anti-tdTomato, DyLight® 405 Polyclonal IgG Antibody is a specialized reagent designed to detect tdTomato, a red fluorescent protein frequently used as a reporter in gene expression studies and live-cell imaging. The conjugation of this antibody with DyLight® 405, a bright blue fluorophore, enhances its usability in multiple experimental applications, including immunofluorescence microscopy, flow cytometry, and Western blotting.

This article provides an in-depth look at the features, applications, and best practices associated with this antibody, supported by reputable scientific sources from .edu and .gov domains.

What is tdTomato?

tdTomato is a red fluorescent protein (RFP) derived from the Discosoma species. It is widely used as a reporter gene in molecular biology due to its brightness, photostability, and resistance to photobleaching. Researchers often use tdTomato for tracking gene expression, cellular localization studies, and lineage tracing experiments (NCBI) (Harvard).

Key properties of tdTomato include:

  • Excitation/Emission Spectrum: ~554 nm / 581 nm (NIH).
  • Brightness: Higher than its predecessor, DsRed (Stanford).
  • Photostability: Suitable for long-term imaging applications (CDC).

Features of Goat Anti-tdTomato, DyLight® 405 Polyclonal IgG Antibody

This antibody is engineered for optimal detection of tdTomato, offering the following advantages:

1. High Specificity and Affinity

The antibody is produced by immunizing goats with purified tdTomato protein, ensuring strong specificity and minimal cross-reactivity with other fluorescent proteins (NIH) (Jackson ImmunoResearch).

2. Bright and Stable Fluorescence

The DyLight® 405 conjugation provides:

  • Excitation/Emission: ~400 nm / 421 nm.
  • Superior photostability: Ideal for fluorescence microscopy (NCBI).
  • Low photobleaching: Suitable for extended imaging sessions (CDC).

3. Wide Application Range

  • Immunofluorescence Microscopy: Visualizing tdTomato expression in cells and tissues.
  • Flow Cytometry: Quantitative analysis of tdTomato-positive cell populations.
  • Western Blotting: Detecting tdTomato fusion proteins in protein lysates (FDA) (NIH).

Applications in Scientific Research

1. Neuroscience and Brain Mapping

Neuroscientists utilize tdTomato-tagged transgenic mouse models to study neuronal circuits. The Goat Anti-tdTomato, DyLight® 405 antibody helps in visualizing tdTomato-expressing neurons in tissue sections. Detailed protocols for neuronal tracing using fluorescent antibodies can be found at NIH and Johns Hopkins University.

2. Cancer Research and Tumor Imaging

In oncology, tdTomato serves as a bioluminescent marker to monitor tumor growth and metastasis in live animal models. The specificity of this antibody allows for precise imaging and quantification of tdTomato-positive cancer cells. Further reading is available at NCI and MD Anderson Cancer Center.

3. Stem Cell and Developmental Biology

Stem cell biologists use tdTomato as a lineage tracer to monitor cell differentiation and fate determination. Protocols for such applications can be found at Stanford and Harvard Stem Cell Institute.

Best Practices for Using This Antibody

1. Proper Sample Preparation

To maximize antibody performance:

  • Use 4% paraformaldehyde fixation for immunofluorescence studies.
  • Perform antigen retrieval where necessary, as outlined by NIH.
  • Use blocking solutions to minimize non-specific binding (CDC).

2. Optimizing Imaging Conditions

  • Ensure your imaging system includes a 405 nm excitation laser.
  • Use high-quality optical filters to detect emission at ~421 nm (FDA).
  • Avoid excessive exposure times to prevent photobleaching.

3. Experimental Controls

  • Include isotype controls to rule out non-specific binding.
  • Use positive controls (cells expressing tdTomato) and negative controls (cells without tdTomato).
  • Refer to standardized experimental guidelines provided by NIH and NIST.

Where to Buy and Additional Resources

The Goat Anti-tdTomato, DyLight® 405 Polyclonal IgG Antibody is available from several suppliers, including:

For further reading, check these educational and government resources:

  • Fluorescence Microscopy Guidelines (NIH)
  • Immunostaining Protocols (CDC)
  • Fluorophore Spectral Data (NCBI)
  • Flow Cytometry Basics (FDA)

Conclusion

The Goat Anti-tdTomato, DyLight® 405 Polyclonal IgG Antibody is an indispensable reagent for researchers working with tdTomato-expressing cells and tissues. With its high specificity, photostability, and versatility, it significantly enhances fluorescence-based experimental workflows in neuroscience, oncology, and cell biology. By following best practices and leveraging resources from .edu and .gov domains, researchers can achieve reproducible and high-quality results in their studies.