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2017 ; 2
(4
): 253-258
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Experimental evolution and proximate mechanisms in biology
#MMPMID29552649
Yi X
Synth Syst Biotechnol
2017[Dec]; 2
(4
): 253-258
PMID29552649
show ga
Biological functions - studied by molecular, systems and behavioral biology - are
referred to as proximate mechanisms. Why and how they have emerged from the
course of evolution are referred to as ultimate mechanisms. Despite the
conceptual and technical schism between the disciplines that focus on each,
studies from one side can benefit the other. Experimental evolution is an
emerging field at the crossroads of functional and evolutionary biology. Herein
microorganisms and mammalian cell lines evolve in well-controlled laboratory
environments over multiple generations. Phenotypic changes arising from the
process are then characterized in genetics and function to understand the
evolutionary process. While providing empirical tests to evolutionary questions,
such studies also offer opportunities of new insights into proximate mechanisms.
Experimental evolution optimizes biological systems by means of adaptation; the
adapted systems with their mutations present unique perturbed states of the
systems that generate new and often unexpected output/performance. Hence,
learning about these states not only adds to but also might deepen knowledge on
the proximate processes. To demonstrate this point, five examples in experimental
evolution are introduced, and their relevance to functional biology explicated.
In some examples, from evolution experiments, updates were made to known
proximate processes - gene regulation and cell polarization. In some examples,
new contexts were found for known proximate processes - cell division and drug
resistance of cancer. In one example, a new cellular mechanism was discovered.
These cases identify ways the approach of experimental evolution can be used to
ask questions in functional biology.