Real-time quantitative PCR
Real-time quantitative PCR (RT-qPCR) is an innovative and reliable technique for quantitative analysis of gene expression, mutation detection, allele discrimination and single nucleotide polymorphisms (SNP) genotyping. Contrary to classical PCR technology, real-time quantitative PCR can not only detect the presence of a particular DNA sequence at the end of the PCR reaction but also monitor and quantify the amount of amplification in real time.
RT-qPCR systems determine the amount of amplified product by measuring the amount of light emitted by a fluorescent dye. The emission intensity is in direct proportion to the amount of amplified PCR product and, therefore, quantifies the amount of target DNA. The whole RT-qPCR assay can be directly performed in a sealed tube without any purification or separation steps, avoiding risk of contamination and post-PCR handling.
Because double-stranded DNA products have their own specific melting temperature, RT-qPCR systems also enable mutation detection via melting-curve analysis. Furthermore, analysis of the melting-curve data enables one to distinguish between specific PCR products and non-specific PCR products.
Sequence-specific Probes and Non-Sequence-Specific Probes
Detection by RT-qPCR can be sequence-specific or non-sequence specific, and the method chosen can have an influence on your outcome. For instance, SYBR? Green 1, a non-sequence-specific reagent, can bind to any double-stranded DNA including primer-dimers and other non-specific reaction products, and so may lead to an over-estimation of the amount of target DNA. However, sequence-specific probes such as TaqMan or Molecular beacon probes (both types of dual-labeled fluorescent probes) bind only to the target template and therefore achieve accurate and reliable quantification of the amount of target DNA.
Design and Synthesis Service of RT-PCR Primers
GenePharma provides free design of RT-PRC primers and probes.
Our optimized primer design techniques - utilizing the latest database resources and bioinformatics knowledge - enable us to create and select the best primers. You may get the best experimental results by using primers and RT-PCR reagents provided by our company in our recommended standard reaction conditions. Our special primer design has the following characteristics:
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Primer-dimer formation is very unlikely to occur;
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Primers are normally designed crossing exon junction, which makes amplification of genomic DNA very unlikely;
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The primer sequence does not contain known SNP sites (confirmed by dbSNP);
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The specificity is confirmed through homology search;
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Choosing the design region under experimental purposes;
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Normally, 1 - 3 pairs of corresponding primers are provided for one target gene;
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Design according to the full sequence of target gene;
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Design among the 1,500 bases at the 5’ end;
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Design among the 1,500 bases at the 3’ end.
Customers must only provide the following information:
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Species (such as Human, Mouse, Rat);
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Target gene (GeneBank Acc, GeneID, key word);
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Primer design region (full sequence, 5 ' end sequence, 3 ' end sequence);
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Non-sequence-specific (SYBR Green I) or sequence-specific fluorescent probe (TaqMan probes or Molecular beacons, see the table below for our available probe types)
GenePharma available RT-qPCR fluorescent probe types :
Cat. No.
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Probe Type
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Purification
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Quantity
|
Price
|
Production Time
|
5’ reporter
|
3’ quencher
|
P-01
|
FAM
|
DABCYL
|
PAGE+HPLC
|
2 OD
|
$99
|
1 week
|
P-02
|
FAM
|
TAMRA
|
PAGE+HPLC
|
2 OD
|
$99
|
1 week
|
P-03
|
FAM
|
BHQ-1
|
PAGE+HPLC
|
2 OD
|
$108
|
1 week
|
P-04
|
TAMRA
|
BHQ-2
|
PAGE+HPLC
|
2 OD
|
$108
|
1 week
|
P-05
|
HEX
|
DABCYL
|
PAGE+HPLC
|
2 OD
|
$133
|
1 week
|
P-06
|
Cy3
|
DABCYL
|
PAGE+HPLC
|
2 OD
|
$158
|
1 week
|
P-07
|
TET
|
DABCYL
|
PAGE+HPLC
|
2 OD
|
$116
|
1 week
|
P-08
|
JOE
|
DABCYL
|
PAGE+HPLC
|
2 OD
|
$133
|
1 week
|
P-09
|
ROX
|
BHQ-2
|
PAGE+HPLC
|
2 OD
|
$133
|
1 week
|
For technical assistance, email support@genepharma.com. For questions related to order placement, email bd@genepharma.com.
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