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Updated: Oct 9, 2025

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Morphological Characterization of Antibiotic Combinations.

Marc A Coram1, Lisha Wang2, William J Godinez3

  • 1Google Research Applied Science, Mountain View, California 94043, United States.

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|December 23, 2021
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Analyzing antibiotic combinations with high-content imaging reveals distinct morphological changes. These cellular responses often differ from viability effects, offering new insights into drug interactions and potential synergistic pairings.

Keywords:
antibiotic combinationshigh-content imagingphenotypic screening

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Area of Science:

  • Microbiology
  • Cell Biology
  • Pharmacology

Background:

  • Combination therapies are widely used in treating infections and cancer.
  • Evaluating drug combinations typically involves checkerboard assays to assess synergistic, antagonistic, or neutral effects on cell growth.
  • Understanding the complex interactions of antibiotic combinations requires advanced analytical methods.

Purpose of the Study:

  • To investigate morphological changes in *Escherichia coli* cells treated with antibiotic combinations using high-content imaging.
  • To correlate observed morphological alterations with drug efficacy and identify novel interaction patterns.
  • To develop an image-based approach for analyzing complex phenotypic responses to combination therapies.

Main Methods:

  • Utilized high-content imaging to capture morphological changes in *E. coli* during checkerboard experiments.
  • Employed automated, unsupervised image analysis to cluster cellular morphologies.
  • Integrated expert annotation to interpret and attribute observed phenotypic variations to specific treatment conditions.

Main Results:

  • Identified diverse morphological changes, including potentiation, competition, and unexpected phenotypes, in response to single and combination antibiotic treatments.
  • Observed that morphological changes frequently did not correlate with synergistic or antagonistic effects on cell viability.
  • Documented transitional and uncharacterized morphologies associated with varying compound doses and known antibiotics.

Conclusions:

  • Morphological profiling provides a distinct signature of biological interactions between compounds, complementing traditional viability assays.
  • The combination of unsupervised image analysis and expert knowledge effectively characterizes complex phenotypic responses in drug screening.
  • Quantifying morphological diversity can enhance the analysis and prioritization of effective antibiotic combinations by revealing integrated cellular responses.