IGEM:IMPERIAL/2008/New/Genetic Circuit
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Editors: Erika  Editors: Erika  
  ==Why model the genetic circuit==  +  ==Why model the genetic circuit?== 
An accurate mathematical description of genetic circult behaviour is one of the foundations of synthetic biology. Such descriptions are an integral component of part submission to the registry, as exemplified by the canonical characterised part F2620. <citation needed>. The ability to capture part behaviour as a mathematical relationship between input and output is useful for future reuse of the part modification of integration into novel genetic circuits.  An accurate mathematical description of genetic circult behaviour is one of the foundations of synthetic biology. Such descriptions are an integral component of part submission to the registry, as exemplified by the canonical characterised part F2620. <citation needed>. The ability to capture part behaviour as a mathematical relationship between input and output is useful for future reuse of the part modification of integration into novel genetic circuits.  
  ==Modelling  +  ==Modelling Constitutive Gene Expression== 
[[Image:Phase 1.PNGthumb300px]]  [[Image:Phase 1.PNGthumb300px]]  
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*In the case where <math>d_1 = 0</math>, the concentration of protein does not reach a steady state.  *In the case where <math>d_1 = 0</math>, the concentration of protein does not reach a steady state.  
  ==Modelling  +  ==Modelling Inducible Gene Expression== 
The repressor is constitutively expressed. Hence we can assume the constitutive expression model from the previous characterisation step.  The repressor is constitutively expressed. Hence we can assume the constitutive expression model from the previous characterisation step. 
Revision as of 14:15, 9 September 2008
 
Genetic CircuitAuthors: Erika Editors: Erika Why model the genetic circuit?An accurate mathematical description of genetic circult behaviour is one of the foundations of synthetic biology. Such descriptions are an integral component of part submission to the registry, as exemplified by the canonical characterised part F2620. <citation needed>. The ability to capture part behaviour as a mathematical relationship between input and output is useful for future reuse of the part modification of integration into novel genetic circuits. Modelling Constitutive Gene ExpressionA simple synthesisdegradation model is assumed for the modelling of the expression of a protein under the control of a constitutive promoter, with the same model assumed for all four promoterRBS constructs. The synthesisdegradation model assumes a steady state level of mRNA.
In this case, [protein] represents the concentration of GFP, k_{1} represents the rate of sythesis and d_{1} represents the degradation rate.
We can easily simulate this synthesisdegradation model using matlab: We can also solve this ODE analytically.
Modelling Inducible Gene ExpressionThe repressor is constitutively expressed. Hence we can assume the constitutive expression model from the previous characterisation step.
When the inducer is added it binds reversibly to the repressor.
Free repressor only binds to the promoter, we think this will show cooperative binding as there are two repressor binding sites on the promoter sequence. Then transcription will be a function of free repressor concentration.
And overall protein expression can be described as
