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From genotype to phenotype: decoding mutations in blasts by holo-tomographic flow cytometry.

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Holo-tomographic flow cytometry (HTFC) precisely captures 3D nuclear shapes in acute myeloid leukemia (AML) cells. This technique links nuclear morphology to Nucleophosmin 1 (NPM1) mutations, potentially improving AML diagnostics.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Hematology

Background:

  • Cup-like nuclear morphology in acute myeloid leukemia (AML) is linked to Nucleophosmin 1 (NPM1) mutations.
  • NPM1-mutated AML is a recognized entity, yet lacks standardized morphological analysis tools.
  • Traditional holographic tomography (HT) faces limitations with adherent cells, causing reconstruction artifacts.

Purpose of the Study:

  • To develop and validate holo-tomographic flow cytometry (HTFC) for quantitative 3D nuclear shape analysis of AML cells in suspension.
  • To establish a label-free method for correlating nuclear morphology with NPM1 mutation status in AML.
  • To explore the potential of HTFC in enhancing AML diagnostic approaches.

Main Methods:

  • Holo-tomographic flow cytometry (HTFC) was employed to analyze AML cells in suspension.
  • A novel segmentation strategy was developed to accurately reconstruct 3D concave nuclei from label-free refractive index (RI) tomograms.
  • Ensemble-level statistical characterization was performed on NPM1-wild type and NPM1-mutated AML blasts.

Main Results:

  • HTFC successfully achieved quantitative specificity and precise capture of nuclear volumetric shape in suspended AML cells.
  • A novel method for segmenting 3D concave nuclei was demonstrated in a clinical AML case.
  • Distinct morphological and biophysical variances were identified between NPM1-wild type and NPM1-mutated AML blasts.

Conclusions:

  • HTFC provides a quantitative, label-free method for assessing 3D nuclear morphology in AML cells.
  • The study demonstrates a link between aberrant AML nuclear morphology and NPM1 mutations using HTFC.
  • Characterizing cup-like nuclei via HTFC shows promise for improving the diagnostic approach in NPM1-related AML.