Spiky oscillations in NF-kB signalling

Details Spiky oscillations in NF-kB signalling Spiky oscillations in NF-kB signalling

2005-09-14

arxiv.org/abs/q-bio/0509017v1

PNAS 2006 103: 10840-10845

Biology

Quantitative Biology

Molecular Networks

11 pages, 13 figures

Scientific paper

10.1073/pnas.0604085103

The NF-kB signalling system is involved in a variety of cellular processes including immune response, inflammation, and apoptosis. Recent experiments have found oscillations in the nuclear-cytoplasmic translocation of the NF-kB transcription factor. How the cell uses the oscillations to differentiate input conditions and send specific signals to downstream genes is an open problem. We shed light on this issue by examining the small core network driving the oscillations, which, we show, is designed to produce periodic spikes in nuclear NF-kB concentration. The oscillations can be used to regulate downstream genes in a variety of ways. In particular, we show that genes to whose operator sites NF-kB binds and dissociates fast can respond very sensitively to changes in the input signal, with effective Hill coefficients in excess of 20.

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