Difference between revisions of "Part:BBa K174003"

Revision as of 20:35, 19 October 2009

Heritable, Tunable, Stochastic Switch

This tunable switch is biased heads or tails. It can be tuned to control cell differention and fate stochastically.

As an indication of the decision, either Rfp or Gfp is expresed. An invertible region including sigA promoter and Hin CDS is inverted by Hin. The expression of Hin can be controlled by IPTG and Xylose. As a third level control, with the modified version of ssrA tag on the C-terminus of the Hin protein, it can quickly be degraded (See Part:BBa_K174002 for arabinose controlled sspB adaptor protein for the degradation).

Expresion of Hin, hence the orientiation of the invertible region is affected by the concentration of IPTG, Xylose, Arabinose, the binding affinity of these inducers to LacI, XlyR, AraR respectively, these proteins' repression coefficients on pspac, xylA and araE promoters and the promoters' strengths.

Downstream genes after Rfp or Gfp can be used to trigger cell fate decisions.

For more information about this part go to Newcastle iGEM2009 [http://2009.igem.org/Team:Newcastle/Stochasticity Stochasticity] and [http://2009.igem.org/Team:Newcastle/Modelling Modelling] pages.

Sequence and Features