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Creating Objects and Object Categories for Studying Perception and Perceptual Learning

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Published on: November 2, 2012

Empirical Bayes method using surrounding pixel information for number and brightness analysis.

Ryosuke Fukushima¹, Johtaro Yamamoto², Masataka Kinjo³

¹Laboratory of Molecular Cell Dynamics, Graduate School of Life Science, Hokkaido University, Sapporo, Japan.

Biophysical Journal

|April 4, 2021

Summary

This study introduces EB-MAP-N&B, an improved method for Number and Brightness (N&B) analysis in fluorescence imaging. It enhances accuracy and precision in determining protein concentration and oligomeric states within cells.

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Area of Science:

Cellular and Molecular Biology
Biophysics
Fluorescence Microscopy

Background:

Number and Brightness (N&B) analysis quantifies protein concentration and oligomeric states using fluorescence imaging.
Traditional methods like the method of moments (MoM) suffer from limited accuracy and precision due to experimental constraints.
Outliers in MoM analysis can obscure cellular structures and spatial distribution information.

Purpose of the Study:

To develop a more accurate and precise N&B analysis method for fluorescence imaging.
To improve the visualization of spatial distribution and cellular structures in N&B analysis.
To enhance the quantification of protein concentration and oligomeric states in biological samples.

Main Methods:

Application of maximum likelihood (ML) and maximum a posteriori (MAP) estimation, combined with empirical Bayes (EB) methods (EB-MAP).
Construction of a prior distribution for pixels to leverage information from surrounding pixels.
Comparison of EB-MAP with MoM and ML using simulations and experimental data.

Main Results:

EB-MAP significantly reduced outliers compared to MoM, improving the visibility of spatial distribution and cellular structures.
The precision of EB-MAP for particle number was an order of magnitude better than MoM.
EB-MAP showed 1.5 times better precision for particle brightness compared to MoM.

Conclusions:

The developed EB-MAP-N&B method offers superior accuracy and precision for N&B analysis in fluorescence imaging.
This method aids in accurately recognizing changes in protein concentration and oligomeric states within cells.
Quantifying these parameters is crucial for understanding dynamic molecular mechanisms in cells.