We are interested in the chemical and physical processes that facilitated the transition from chemical evolution to biological evolution on the early earth. As a way of exploring these processes, our laboratory is trying to build a synthetic cellular system that undergoes Darwinian evolution. Our view of what such a chemical system would look like centers on a model of a primitive cell, or protocell, that consists of two main components: a self-replicating genetic polymer and a self-replicating membrane boundary. The job of the genetic polymer is to carry information in a way that allows for both replication and variation, so that new sequences that encode useful functions can be inherited and can further evolve. The role of the protocell membrane is to keep these informational polymers localized, so that the functions they encode lead to an advantage in terms of their own replication or survival. Such a system should, given time and the right environment, begin to evolve in a Darwinian fashion, potentially
leading to the spontaneous emergence of genomically encoded catalysts and structural molecules.
We hope that our explorations of the chemistry and physics behind the emergence of Darwinian evolution will lead to explanations for some of the universal properties of modern cells, as well as explanations of how modern cells arose from their simpler ancestors. As we explore these fundamental questions we are also on the lookout for chemical or physical phenomena that might have practical utility in biomedical research.
The current and past members of the Szostak Lab congratulate Jack for winning the 2009 Nobel Prize in Physiology or Medicine.