Composite

Part:BBa_K3044020:Design

Designed by: Catharina Bang Jensen   Group: iGEM19_SDU-Denmark   (2019-10-08)
Revision as of 22:45, 8 October 2019 by Catharina (Talk | contribs)

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sgRNA/dCas9 system targeting mRFP


Assembly Compatibility:
  • 10
    COMPATIBLE WITH RFC[10]
  • 12
    INCOMPATIBLE WITH RFC[12]
    Illegal NheI site found at 7
    Illegal NheI site found at 30
  • 21
    INCOMPATIBLE WITH RFC[21]
    Illegal BglII site found at 478
    Illegal BglII site found at 1552
  • 23
    COMPATIBLE WITH RFC[23]
  • 25
    COMPATIBLE WITH RFC[25]
  • 1000
    COMPATIBLE WITH RFC[1000]


Design Notes

During the optimization illegal restriction sites were avoided. Another thing to keep in mind was to figure out wich codons to choose for E. coli K12.

The sgRNA was designed according to the design protocol "CRISPR interference (CRISPRi) for sequence-specific control of gene expression". [1] An important thing to keep ind mind when designing a sgRNA is off-targets. Therefore, the sgRNA sequence was aligned to the core genome of our chassis E coli K12 TOP10 and KG22 and no off-targets were found. Though, off-targets may appear in other bacteria strains.


Source

The original sequence of the dCas9 is from BBa_K1150000 and was codon optimized based on a codon frequency table [2]

The sequence of the sgRNA is designed on the basis of the mRFP sequence. The target sequence is determined according to the location of PAM sequences in the target sequence, which the dCas9 protein recognizes.

References