Fast and complete bisulfite conversion of sample DNA is essential for accurate DNA methylation analysis. QIAsymphony Bisulfite Kits include an innovative Bisulfite Solution that allows highly efficient bisulfite conversion in as little as 30 minutes. Streamlined sample lysis and conversion protocols allow efficient purification and bisulfite conversion of DNA, while unique DNA Protect technology minimizes DNA fragmentation during bisulfite treatment. The 3 QIAsymphony Bisulfite Kits are interconnected, functioning as an integrated system of solutions for direct bisulfite conversion of DNA from a broad range of starting materials.
Fast bisulfite conversion
QIAsymphony Bisulfite Kits provide a very fast and streamlined procedure for efficient conversion and purification of DNA prepared from genomic DNA, FFPE, blood, cells, or tissue samples. The kits contain highly concentrated Bisulfite Solution, which reduces the time required to convert unmethylated cytosine residues into uracil from several hours to as little as 30 minutes, as well as preparation buffers that make it unnecessary to isolate the DNA prior to bisulfite treatment. Furthermore, the bisulfite thermal cycling program provides an optimized series of incubation steps necessary for thermal DNA denaturation and subsequent sulfonation and cytosine deamination, enabling high cytosine conversion rates of over 99%. Desulfonation, the final step in chemical conversion of cytosines, is achieved by a convenient on-beads step included in the purification procedure on the QIAsymphony SP.
DNA Protect Buffer
Fast and complete bisulfite conversion of sample DNA is the most critical step for the correct determination of a methylation pattern. This is achieved by incubating the DNA in high bisulfite salt concentrations at high temperature and low pH. These harsh conditions often lead to a high degree of DNA fragmentation and subsequent loss of DNA during purification. Common bisulfite procedures usually require high amounts of input DNA to compensate for DNA degradation during conversion and DNA loss during purification, which often lead to low DNA yield, highly fragmented DNA, and irreproducible conversion rates. With QIAsymphony Bisulfite Kits, DNA fragmentation is prevented during bisulfite conversion by the unique DNA Protect Buffer, which is uniquely formulated to prevent the fragmentation usually associated with bisulfite treatment of DNA at high temperatures and low pH values. It also provides effective DNA denaturation, resulting in the single-stranded DNA necessary for complete cytosine conversion. DNA Protect Buffer also contains a convenient pH indicator dye as a mixing control allowing confirmation of the correct pH for cytosine conversion.
The QIAsymphony Bisulfite Kit procedure simplifies sample preparation and isolation following bisulfite conversion using the QIAsymphony SP instrument (see figure “Schematic of the QIAsymphony SP principle”). The QIAsymphony SP can save you time by processing 1–96 samples — in batches of 24. QIAsymphony technology combines the speed and efficiency of silica-based purification with the convenient handling of magnetic particles.
Deparaffinization of FFPE samples
The first step in extracting DNA from FFPE samples is deparaffinization, whereby paraffin is first dissolved and then removed, exposing samples for subsequent treatment with lysis buffer and proteinase K. With the QIAsymphony Bisulfite FFPE Kit, the deparaffinization, lysis, and decrosslinking of FFPE slices is optimized with Deparaffinization Solution, an innovative chemistry that facilitates deparaffinization with minimal handling. Deparaffinization Solution contributes to high DNA recovery rates, since it remains on the sample while proteinase K digestion is carried out. With no need to pellet the FFPE sample or to remove the paraffin-containing supernatant, the risk of sample loss during deparaffinization is avoided.