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Perspective on CETSA Literature: Toward More Quantitative Data Interpretation.

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The cellular thermal shift assay (CETSA) measures drug-target engagement but is often misinterpreted. This review highlights the need to consider biophysical principles for accurate interpretation and future applications in drug discovery.

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Area of Science:

  • Biophysics
  • Pharmacology
  • Cellular Biology

Background:

  • The cellular thermal shift assay (CETSA) is a method to investigate drug-target engagement in live cells and tissues.
  • CETSA measures protein stabilization upon ligand binding, but this response is influenced by ligand binding thermodynamics and kinetics, not just affinity.
  • Current applications often neglect these biophysical factors, leading to potential misinterpretations when comparing CETSA data with functional assays.

Purpose of the Study:

  • To provide a quantitative context for the early literature on CETSA.
  • To highlight the limitations and biophysical underpinnings of CETSA that are frequently overlooked.
  • To outline future technological developments for improved CETSA applications in drug discovery and structure-activity relationship optimization.

Main Methods:

  • Analysis and annotation of approximately 270 peer-reviewed papers utilizing CETSA.
  • Review of the biophysical principles governing protein stabilization in thermal shift assays.
  • Discussion of emerging CETSA assay formats, including single-cell resolution.

Main Results:

  • The majority of reviewed CETSA studies (~270 papers) do not adequately consider the underlying biophysical basis of the assay.
  • Direct comparisons between CETSA measurements and cellular functional readouts at 37°C are often made without accounting for thermodynamic and kinetic contributions.
  • There is a need for technological advancements to enable more accurate structure-activity relationship optimization and meaningful comparisons with phenotypic data.

Conclusions:

  • Accurate interpretation of CETSA requires consideration of ligand binding thermodynamics and kinetics alongside protein unfolding.
  • Future developments should focus on quantitative biophysical modeling and advanced assay formats for improved drug target engagement studies.
  • Emerging single-cell CETSA formats hold promise for differentiating target engagement in complex cellular models like organoids and tissues.