Biology – Quantitative Biology – Subcellular Processes
Scientific paper
2008-01-17
Phys. Rev. Lett. 98, 108104 (2007)
Biology
Quantitative Biology
Subcellular Processes
See also Nature Physics N&V April 2007
Scientific paper
10.1103/PhysRevLett.98.108104
In mammals, dosage compensation of X linked genes in female cells is achieved by inactivation of one of their two X chromosomes which is randomly chosen. The earliest steps in X-inactivation (XCI), namely the mechanism whereby cells count their X chromosomes and choose between two equivalent X, remain mysterious. Starting from the recent discovery of X chromosome colocalization at the onset of X-inactivation, we propose a Statistical Mechanics model of XCI, which is investigated by computer simulations and checked against experimental data. Our model describes how a `blocking factor' complex is self-assembled and why only one is formed out of many diffusible molecules, resulting in a spontaneous symmetry breaking (SB) in the binding to two identical chromosomes. These results are used to derive a scenario of biological implications describing all current experimental evidences, e.g., the importance of colocalization.
Nicodemi Mario
Prisco Antonella
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