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Model may offer better understanding of embryonic development
Date:3/9/2010

WEST LAFAYETTE, Ind. - A mathematical model developed at Purdue University can predict complex signaling patterns that could help scientists determine how stem cells in an embryo later become specific tissues, knowledge that could be used to understand and treat developmental disorders and some diseases.

During embryonic development, proteins attach to cell receptors and start a cascade of reactions. Understanding those reactions is difficult, however, because feedback signals go back out to the proteins or other molecules along the cascade, constantly changing the reaction pattern. The outcomes of those reactions and the feedback mechanisms - or inputs - are known because they can be observed, but how the inputs lead to the outputs isn't understood.

"We want to understand how stem cells become tissue-specific so that we can manipulate that process to create cells that could be used to treat injuries and diseases," said David Umulis, a Purdue assistant professor of agricultural and biological engineering. "Using a model approach, we can simulate these complex signaling patterns to get a better handle on the process."

Umulis created a model that predicted accurate outcomes when different feedback mechanisms were inserted. His results were published in the current issue of the journal Developmental Cell.

"Fruit fly embryos are a fantastic system to peer into early development since input/output relationships are easy to observe. You have a mutation and an output, but we don't typically know what happens in the middle," he said. "Realistic model embryos proved an additional tool that can be used to aid in that understanding. Models can link that cause and effect."

The study looked at fruit fly, or drosophila, embryos during very early development to decipher what controls the differentiation of these stem cells at their proper locations. During the process, cells take on identities that later specify tissue types
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Contact: Brian Wallheimer
bwallhei@purdue.edu
765-496-2050
Purdue University
Source:Eurekalert

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