Team:Heidelberg/Delftibactin/DelRest

From 2013.igem.org

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                                   <h1>Week 15</h1>
                                   <h1>Week 15</h1>
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                                   <p style="font-size:10pt; text-align:justify; position:relative; margin-left:6%;">
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Single read sequencing of the fragments
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Single read sequencing of the PCR amplified fragments DelA-E, DelL as well as the backbone pSB4K5
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???? insert fragments here???
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was carried out by GATC. We blasted the obtained seqeuences against the reference sequence based on the <i>D. acidovorans SPH-1</i> strain available on NCBI. Although our sequence matched to the reference sequence, we found a significant number of missmatches, which was too diverse and high to be simply explained by random mutations introduced by our polymerase during PCR (note: we used a high-fidelity proofreading polymerase suitable for GC-rich templates and long amplicons). We thus hypothesized that the SPH-1 strain based on which our cloning strategy was designed might have a significant number of single-nucleotide polymorphisms in the Del cluster compared to the <i>D. acidovorans</i> DSM-39 strain, which we used as template for all PCRs (note: there is no complete genomic sequence available for the DSM-39 strain on NCBI). We further hypothesized, that this difference in sequence between the DSM-39 strain used as PCR template and the SPH-1 strain based on which our primers were designed could explain our troubles with the PCR amplifications of DelF-G and DelO-P. In consequence, we ordered the SPH-1 strain from the DSMZ in order to obtain a suitable template for our PCRs. This solved all our PCR problems right away and we were able to get all amplicons required for cloning the DelRest construct within this week. Furthermore, we successfully validated our amplicons by restriction digest and sequencing.  
was carried out by GATC. We blasted the obtained seqeuences against the reference sequence based on the <i>D. acidovorans SPH-1</i> strain available on NCBI. Although our sequence matched to the reference sequence, we found a significant number of missmatches, which was too diverse and high to be simply explained by random mutations introduced by our polymerase during PCR (note: we used a high-fidelity proofreading polymerase suitable for GC-rich templates and long amplicons). We thus hypothesized that the SPH-1 strain based on which our cloning strategy was designed might have a significant number of single-nucleotide polymorphisms in the Del cluster compared to the <i>D. acidovorans</i> DSM-39 strain, which we used as template for all PCRs (note: there is no complete genomic sequence available for the DSM-39 strain on NCBI). We further hypothesized, that this difference in sequence between the DSM-39 strain used as PCR template and the SPH-1 strain based on which our primers were designed could explain our troubles with the PCR amplifications of DelF-G and DelO-P. In consequence, we ordered the SPH-1 strain from the DSMZ in order to obtain a suitable template for our PCRs. This solved all our PCR problems right away and we were able to get all amplicons required for cloning the DelRest construct within this week. Furthermore, we successfully validated our amplicons by restriction digest and sequencing.  
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</p>

Revision as of 12:25, 3 October 2013

Del Rest. Creating a 32 kbp plasmid.

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Methods: