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Séminaire d'équipe(s) BioInfo
Minimal conditions for proto-cell stationary growth
Erwan Bigan

19 June 2014, 14h00 - 19 June 2014, 15h00
Salle/Bat : unknown/unknown
Contact :

Activités de recherche : Biologie des systèmes

Résumé :
A proto-cell toy model has been used to investigate conditions under which
qualitative properties of living systems may emerge. This model relies upon
randomly generated chemical reaction networks. Generated networks are
plausible in the sense that they are compatible with mass conservation and
with thermodynamics. The proto-cell model assumes that such a reaction network
is embedded within a membrane resulting from the self-assembly of one of the
chemical species, and that this membrane is semi-permeable to some other
chemical species (nutrient) diffusing from an outside growth medium into the
proto-cell. Nutrient metabolization inside the cell results in the synthesis
of the membrane precursor as well as that of all other chemical species. The
cell membrane area increases as the synthesized membrane precursor gets
incorporated in the self-assembled membrane. This results in an increase in
cell volume and in a dilution of all constituents. Necessary and sufficient
conditions for the cell to reach an asymptotic stationary growth regime have
been characterized numerically, and demonstrated mathematically. They suggest
that there is a very broad range of chemical reaction networks compatible with
proto-cell stationary growth, and that the most stringent requirements for the
emergence of life probably lie with the membrane (self-assembly of some
membrane precursor synthesized from within).

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