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Probing the limits to positional information.

Thomas Gregor¹, David W Tank, Eric F Wieschaus

¹Joseph Henry Laboratories of Physics, Princeton University, Princeton, NJ 08544, USA. tg2@princeton.edu

|July 17, 2007

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Biological patterning precision, crucial for development, is remarkably accurate. The Bicoid morphogen system in Drosophila embryos achieves approximately 10% precision in concentration, demonstrating robust control and reliable readout.

Area of Science:

Developmental Biology
Molecular Biology
Genetics

Background:

Biological patterning relies on accurate morphogen concentration gradients.
The Bicoid morphogen in Drosophila embryos is a key determinant of anterior-posterior patterning.

Purpose of the Study:

To quantify the precision of Bicoid morphogen concentration profiles in Drosophila embryos.
To assess different measures of precision, including concentration differences, molecular noise, readout noise, and inter-embryo reproducibility.

Main Methods:

Experimental measurement of Bicoid concentration.
Analysis of Hunchback activation as a readout mechanism.
Comparison of Bicoid levels across multiple embryos.

Main Results:

Related Experiment Videos

Four distinct measures of precision for Bicoid concentration were evaluated.
All assessed measures of precision were found to be approximately 10%.

Conclusions:

The Drosophila embryo exhibits high precision in establishing and reading Bicoid morphogen gradients.
The system demonstrates robust control over absolute concentrations and reliable detection of small differences, approaching physical limits.