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Related Experiment Video

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Laser Doppler Perfusion Imaging in the Mouse Hindlimb

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Precision of the Dpp gradient.

Tobias Bollenbach¹, Periklis Pantazis, Anna Kicheva

¹Max-Planck-Institute for the Physics of Complex Systems, Dresden, Germany.

Development (Cambridge, England)

|February 26, 2008

Summary

This summary is machine-generated.

The morphogen Dpp provides precise positional information in developing tissues. Its gradient

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Area of Science:

Developmental biology
Cell signaling
Genetics

Background:

Morphogen gradients are crucial for development, providing positional cues.
The precision of secreted morphogen gradients and their target gene regulation is less understood compared to syncytial morphogens.

Purpose of the Study:

Investigate the precision of the TGF-beta-type morphogen Dpp gradient in the wing epithelium.
Determine how source and target tissue variability affect Dpp gradient precision.
Assess the reliability of Dpp target gene (spalt) expression domains.

Main Methods:

Theoretical modeling of morphogen gradient variability.
Experimental determination of Dpp concentration gradient precision.
Measurement of Dpp signaling activity and spalt gene expression precision in vivo.

Main Results:

Theoretical models predicted maximal gradient precision at a distance from the source.
Experimental data confirmed maximal Dpp gradient precision a few cells away from the source.
The precision of the Dpp gradient directly correlates with the precision of spalt gene expression.

Conclusions:

The Dpp gradient acts as a morphogen, coarsely determining target gene expression patterns.
Maximal positional information is provided by the Dpp gradient approximately one cell diameter away from the source.
Cell-to-cell variability influences gradient precision, with optimal precision found at a specific distance from the signaling source.