PCR Purification with SPRI Method
Learn about the importance of purifying PCR products using the Solid-Phase Reversible Immobilization (SPRI) method to remove impurities and concentrate target DNA for sensitive processes like sequencing by nanopore. Explore the principles, goals, components removed, and steps involved in this purification technique.
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Presentation Transcript
Purification of PCR products by SPRI
What is a PCR (summary)? Polymerase Chain Reaction -> to copy DNA Reaction attempt Buffer DNA-Template DNA- Polymerase dNTPs PCR Steps: Denaturation Annealing Elongation Polymerase extends DNA only in 5 -3 direction DNA is made of 2 strands DNA which joinied by complementary base pairing
Why is purification of the PCR Product needed? Sequencing by nanopore is a highly sensitive process Components that are contained after PCR: DNA-Polymerase (clogs the pore of Nanopore) Primer Nucleotides (unwanted dNTPs could lead to false sequencing results) DNA-Template Target DNA Purpose of purification: Remove the impurities Concentrate the target DNA
SPRI (Solid-Phase-Reversible-Immobilization) Goal: purify the PCR product to gain only our wished Gene ( 1500 BP) What does it remove? DNA-Polymerase Primer DNA-Template Nucleotide
Principle SPRI (Solid-Phase-Reversible-Immobilization) Is based on the negative load of the DNA and positive loaded beads which bind the DNA Magnetic Beads Relies on a magnetic fields by attracting negative loaded DNA
Selective Binding The biding depends on the size of the fragment because of a special polymer coating Reversible Immobilization Binds under binding condition -> can be released under elution condition
2. Separate DNA on the beads using a magnet 2.1. washing with ethyl alcohol 3x