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Seminars & Lectures

* TITLE

How is the Landscape Upon Which Life Evolves Selected: Spontaneous Emergence of Modularity

* SPEAKERS

Name	Affiliation	E-mail
Michael Deem	Rice University, Houston, TX	jmanpark(at)catholic.ac.kr

* HOST(Applicant)

Name	Affiliation	E-mail
-

* DATE / TIME

2009-04-04, 4:30 - 6:00 p.m.

* PLACE

Rm 1423, KIAS

* ABSTRACT

We investigate the selective forces that promote the emergence of
modularity in nature. We demonstrate the spontaneous emergence of
modularity in a population of individuals that evolve in a changing
environment. That is, we show in a general sense the emergence of biology
from chemistry. We show that the level of modularity correlates with the
rapidity and severity of environmental change. The modularity arises as a
synergistic response to the noise in the environment in the presence of
horizontal gene transfer. We suggest that the hierarchical structure
observed in the natural world may be a broken symmetry state, which
generically results from evolution in a changing environment. These
results are derived within the context of a general spin glass model. To
support these theoretical results, we analyze experimental protein interaction
data and show that protein interaction networks became increasingly modular
as evolution proceeded over the last four billion years. Evidence for
increased modularity of bacterial metabolic networks in more dramatically
changing physics environments will also be presented.

1) J. Sun and M. W. Deem, \"Spontaneous Emergence of Modularity in a Model of
Evolving Individuals,\" Phys. Rev. Lett. 99 (2007) 228107.
2) J. He, J. Sun, and M. W. Deem, \"Spontaneous Emergence of Modularity in a
Model of Evolving Individuals and in Real Networks,\" Phys. Rev. E 79 (2009) 031907.

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