Centered reduced moments and associate density functions applied to alkaline comet assay

Area of Science:

• Biochemistry
• Molecular Biology
• Cell Biology

Background:

• The single cell gel electrophoresis (SCGE) assay is a widely used technique for detecting DNA strand breaks in individual mammalian cells.
• Its application has increased due to its sensitivity, speed, and visual nature.
• Current digital image processing methods often rely on expensive and inflexible software providing limited descriptors.

Purpose of the Study:

• To present an effective and flexible alternative for quantitative analysis of SCGE images.
• To demonstrate accurate determination of image descriptors using associated density functions and centered reduced moments.

Main Methods:

• Cells are embedded in agarose and lysed, allowing damaged DNA to migrate and form a 'comet tail' during electrophoresis.
• Digital image processing is applied to record and analyze cell images captured by charge-coupled device cameras.
• Associated density functions and centered reduced moments are utilized for quantitative analysis.

Main Results:

• The proposed method accurately determines the position of the center of mass of comet images.
• It precisely calculates the lengths and orientation of the main semiaxes.
• Eccentricity of the comet images is also accurately determined.

Conclusions:

• Associated density functions and centered reduced moments provide an effective and flexible approach for quantitative analysis in SCGE assays.
• This method overcomes the limitations of conventional, expensive software.
• Accurate determination of key image descriptors is achievable, enhancing the utility of the SCGE assay.