David Coil edited 16S rDNA Sequencing and Analysis (Organism Identification).md  over 9 years ago

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After PCR is completed, confirm the PCR reaction worked by agarose gel electrophoresis, all controls behaved as expected, and that you have DNA fragments of the correct size (~1350bp).   ##Submit Samples for Sequencing  Very few single-researcher labs maintain Sanger sequencing capacity. However, there are a number of DNA sequencing facilities (commercial and academic) that provide sequencing services for researchers. They will handle as little as a single sample, or will allow you to submit an unlimited number of samples, typically arrayed in 96-well plates. You will typically provide both your PCR product as well as your PCR primers for sequencing. Don't forget to submit forward (27F) and reverse (1391R) reactions for each sample. Each facility will have its own guidelines concerning DNA and primer concentration. Our lab uses the UC Davis  DNA Sequencing Facility-UC Davis Facility  http://dnaseq.ucdavis.edu. If a quick internet search does not reveal the presence of a Sequencing Facility near you, most sequencing centers will allow you to ship samples to them for sequencing. ##Sanger Sequence Processing  Upon receiving Sanger reads from a sequencing facility, typically via e-mail, it is necessary to do some pre-processing before they can be analyzed. These steps include quality trimming the reads, reverse complementing the reverse sequence, aligning the reads, generating a consensus sequence, and converting to FASTA format. There are very limited options for free software that allow the user to perform these steps.