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Updated: Jul 19, 2026
11:05
A Gradient-generating Microfluidic Device for Cell Biology
Published on: August 30, 2007
Cell lineage transport: a mechanism for molecular gradient formation
Marta Ibañes1, Yasuhiko Kawakami, Diego Rasskin-Gutman
1Gene Expression Laboratory, Salk Institute for Biological Studies, La Jolla, CA 92037, USA.
Molecular Systems Biology
|October 19, 2006
Summary
Cell lineage transport explains how gradients of non-secreted molecules form in developing tissues. This mechanism, observed in limb bud development, coordinates embryonic growth and patterning.
Area of Science:
- Developmental Biology
- Systems Biology
- Biophysics
Background:
- Gradient formation is crucial for embryonic patterning, typically involving secreted proteins.
- The mechanisms generating gradients of non-secreted molecules, like mRNA and intracellular proteins, remain less understood.
Purpose of the Study:
- To mathematically model and experimentally validate gradient formation of non-secreted molecules in developing tissues.
- To introduce and define the 'cell lineage transport' mechanism for gradient generation.
Main Methods:
- Mathematical modeling of molecular transport and dilution in growing cell populations.
- Experimental validation using Hoxd13 gradients in vertebrate limb bud development.
Main Results:
- Demonstrated that cell division and growth can drive the formation of molecular gradients.
- Identified a power-law profile for non-secreted molecule gradients.
- Showcased a distal-to-proximal Hoxd13 gradient in limb buds as evidence for cell lineage transport.
Conclusions:
- Cell lineage transport is a viable mechanism for generating gradients of non-secreted molecules during embryonic development.
- This mechanism links tissue growth with spatial patterning.
- The model offers robustness to spatial gradient formation but reduces temporal sensitivity.
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