
Overview
Sso7d, a 7 kD protein obtained from Sulfolobus solfataricus, binds to dsDNA without any sequence specificity.
Sso7d is covalently linked to a DNA polymerase and is able to stabilize the polymerase-template complex without compromising the structural integrity, thermal stability, or catalytic activity of the enzyme.
The unique structure of this Sso7d fusion polymerase provides several significant advantages over ordinary DNA polymerase:
- Increased processivity
- Effective amplification in GC-rich regions or strong secondary structure
- Efficient amplification of longer products
- Superior tolerance to PCR inhibitors

Obtaining enough starting material to complete multiple gene expression experiments can be challenging when working with precious and limited samples. See how Mark Kibschull of the Lunenfeld-Tanenbaum Research Institute in Toronto determines pluripotency and differentiation of limited human embryonic stem cells using Bio-Rad's SingleShot™ Cell Lysis Kit, SsoAdvanced™ PreAmp Supermix, and PrimePCR™ Validated Primer Panels. This simplified workflow allows for the gene expression analysis of hundreds of genes from as little as 100 human embryonic stem cells, and without the cumbersome step of isolating and purifying RNA.
SsoAdvanced™ PreAmp Supermix provides optimal unbiased preamplification of up to 100 targets.
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Preamplification of 100 sequences was performed using PrimePCR™ Assays (SYBR® Green) ΔΔCq <0.75. |
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Cq values (expression levels) of 100 targets used in the preamplification pool shown above. |
SsoAdvanced™ PreAmp Supermix provides superior unbiased preamplification of 24 probe-based qPCR assays compared to Life Technologies TaqMan PreAmp Master Mix.
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Preamplification of 24 PrimePCR™ probe-based cancer gene targets using SsoAdvanced PreAmp Supermix followed by qPCR using SsoAdvanced Universal Probes Supermix; average absolute ΔΔCq = 0.21 (1 of 24 >0.75). |
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Preamplification of 24 TaqMan probe-based cancer gene targets using TaqMan PreAmp Master Mix followed by qPCR using TaqMan Gene Expression Master Mix; average absolute ΔΔCq = 0.48 (6 of 24 > 0.75). Ideal ΔΔCq = 0.00. Cq, quantification cycle. |
SsoAdvanced™ PreAmp Supermix provides optimal preamplification of low cDNA input.
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NANOG (A, a high expressor), PAX6 (B, a medium expressor), and NEUROG2 (C, a low expressor) show consistent expression levels regardless of the cDNA input (10 ng to 100 pg). cDNA was prepared from a panel of 22 neuronal stem cells treated with retinoic acid for up to 7 days. 1 µg cDNA was used for the no preamplification control. |
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