Metrics for assessing cytoskeletal orientational correlations and consistency

Area of Science:

• Biology
• Biophysics
• Biotechnology

Background:

• Biological organization across scales is crucial for function.
• Advances in tissue imaging yield abundant data but lack quantitative descriptive metrics.
• A metric is needed to assess the correlated orientation of diverse biological constructs within tissues.

Purpose of the Study:

• To develop a novel metric for quantifying the correlation and consistency of construct orientation in biological tissues.
• To demonstrate the application of this metric using cardiac tissue imaging data.

Main Methods:

• The co-orientational order parameter (COOP) was developed, building upon the classical orientational order parameter (OOP).
• Mathematical theorems were proven to define the properties and boundaries of the COOP.
• The COOP was applied to both synthetic datasets and experimental images of cardiac tissues.

Main Results:

• The COOP effectively quantifies the correlated orientation between structures like actin filaments and sarcomeric Z-lines.
• Cardiac tissues exhibited perfect correlation between actin filaments and Z-lines, as validated by the COOP.
• The metric also quantified orientation consistency within similarly shaped cells.

Conclusions:

• The COOP offers a quantitative method to characterize tissue organization beyond simple co-localization or individual construct orientation.
• This parameter can be utilized for analyzing quantitative changes in cardiac tissue during development, disease, or other biological processes.