Assay Design Considerations, Optimization and Validation
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1 Assay Design Considerations, Optimization and Validation Ray Meng, Ph.D. International Field Applications Specialist Gene Expression Division Bio-Rad Laboratories, Inc.
2 Assay Design Considerations
3 Experiment Considerations AMPLIFICATION Sample Preparation Quality and homogeneity of sample Sample Extraction Source of inhibitors Template preparation RNA extraction, quality, quantification Reverse transcription Strategy Experiment setup Technical replicates Biological replicates Optimization of primers and probes
4 Sample Preparation AMPLIFICATION Preparation Considerations RNA or DNA Source Homogeneity Prep time to extraction Sample degradation
5 Sample Extraction AMPLIFICATION DNA / RNA Aquapure TM Genomic DNA Isolation Kit Aurum TM Total RNA Kits Contaminants Starches Lipids Metals Extraction contaminants Phenol chloroform salts Sample degradation
6 Template DNA Preparation AMPLIFICATION Genomic DNA Cut with restriction enzyme that does not cut within amplicon Boil DNA for 10 min and then onto ice Plasmid DNA If it doesn t work, linearize plasmid with restriction enzyme that does not cut within amplicon cdna Treat RNA with RNase-free DNase prior to reverse transcription Use enzyme that has RNaseH activity to digest away RNA from RNA:DNA hybrid after making cdna.
7 Template Preparation AMPLIFICATION Extract and analyze RNA Careful quantification is necessary RiboGreen Assay - Quantification NanoDrop Quantification and purity Experion - Quality and quantification
8 Experion Analysis of RNA AMPLIFICATION Experiment: Evaluate sirna-mediated gene silencing Prevent faulty conclusions GAPDH sirna Scrambled sirna control A B C T 6.8 C T 4.3
9 Reverse Transcription Reproducible Data RNA Reality Ideal? cdna Not Reproducible
10 Reverse transcription Experiment: Testing Results Across a Range of cdna Input Concentrations iscript qrt-pcr Standard Curve Comparison: cdna serial dilution vs. total RNA serial dilution β-actin T cdna Standard Total RNA Standard y e cdna total Slope Corr. Coef Intercept PCR efficiency 97.1% 97.6% RNA isolated from HeLa cells d u Log Starting Quantity (femtograms of input RNA) Note: 1/10th of cdna reaction used for PCR
11 iscript based reagents AMPLIFICATION Reverse Transcription iscript TM cdna Synthesis Kit iscript Select cdna Synthesis Kit One-Step qrt-pcr iscript One-Step RT-PCR Kit with SYBR Green iscript One-Step RT-PCR Kit for Probes
12 Experiment setup Replicates Need for both technical replicates and Biological replicates. Number of replicates will depend on level of differences that are being presented. Lower expression genes tend to require more replicates to establish statistical validity of small differences. Biological Technical
13 Optimization of primers and probes AMPLIFICATION Hallmarks of an optimized real-time PCR assay: One specific product Good PCR efficiency Good intra- and inter-experimental reproducibility Sensitivity over a broad dynamic range Each hallmark can be tested experimentally. Spending more time on assay design means less time to achieve validated results.
14 Optimization of primers and probes Reaction Efficiency Reaction efficiency is 100% if product doubles at every cycle. Efficiency should be 100 +/- 10% Measure efficiency using a serial dilution of template Reactions designated as standards If template quantity is unknown, use 1.0, 0.1, 0.01, etc. Efficiency calculated based on standard curve slope
15 Optimization of primers and probes Efficiency (η) = [10 (-1/slope) ] - 1
16 Optimization of primers and probes AMPLIFICATION SYBR Green Validation Use a serial dilution of template to test primers across a broad dynamic range. Include representative unknown samples. Evaluate specificity, efficiency, reproducibility and dynamic range.
17 Optimization of primers and probes AMPLIFICATION Limit secondary structure 50 to 60% overall GC content Limit stretches of G or C s longer than 3 bases No Gs on the 5 end Place C s and G s on ends of primers, but no more than 2 in the last 5 bases on 3 end
18 Optimization of primers and probes AMPLIFICATION Perform BLAST searches on primers (and probe) and the target sequence. If starting with SYBR Green, design assay with the potential to use probes and to multiplex later. Test multiple primer combinations Find the primer pair with no primer-dimers and the best reaction efficiency
19 Assay Design
20 Amplicon Design AMPLIFICATION Length of 75 to 200 bp Limited secondary structure Model secondary structure using mfold, elaborate on salt and temp. Avoid primer locations at stem loop structures
21 Probe Based Assays AMPLIFICATION Design primers first, test the reaction with SYBR Green, and then design the probe. For probe assays the fluorescence should be target specific, but the assay does not monitor PCR specificity. Amplicon size of bp Consider reporter fluorophore(s) for multiplexing.
22 TaqMan Design AMPLIFICATION Probe should have a Tm ~10oC higher than primers Tm of probe 68-70C G/C content 30-70% No G at 5 end Avoid identical nucleotide runs Avoid secondary structures Avoid dimerization with primers Select strand that gives more C than G bases
23 Primer Design Target Sequence 2 nd Structure Analysis Think Small Watch out for primer dimers NCBI HomePage Stacking No-Web Next Test in Real life conditions
24 Primer Design Free resource Blast sequence Stack sequence
25 Primer Design gov/blast/blast.cgi
26 Primer Design Target Sequence 2 nd Structure Analysis Think Small Watch out for primer dimers Mfold Dr. Zuker No-Web Next Test in Real life conditions
27 Amplicon Secondary Structures Bad location for primers Good location for primers
28 Primer Design Reverse primer A Reverse Primer B η = 66.3 % Forward Primer Reverse Primer A Reverse primer B η = 95.8 %
29 Primer Design Select target sequence: 1261 gatcgcaggg aagatggacc tgaagtcttc cagcaaactc aagaacgggc tcaccttccg 1321 caaggaagac atgcttcagc ggcagctcca cctggagggc atgctatgct ggaagaccac 1381 atcagggcgc ttgaaagata tcctggctat cctgctgacc gacgtacttt tgctgctaca 1441 agaaaaagat cagaaatacg tctttgcttc tgtggactca aagccacccg tcatctcgtt 1501 acaaaagctc atcgtgaggg aagtggccaa cgaggagaaa gcgatgtttc tgatcagcgc 1561 ctccttgcaa gggccggaga tgtatgaaat ctacacgagc tccaaagagg acaggaacgc 1621 ctggatggcc cacatccaaa gggctgtgga gagctgccct gacgaggagg aggggccctt 1681 cagcctgccc gaagaggaaa ggaaggtggt cgaggcccgc gccacgagac tccgggactt 1741 tcaagagcgg ttgagcatga aagaccagct gatcgcacag agcctcctag agaaacagca 1801 gatctacctg gagatggccg agatgggcgg cctcgaagac ctgccccagc cccgaggcct 1861 attccgtgga ggggacccat ccgagaccct gcagggggag ctaattctca agtcggccat Homo sapiens rho/rac guanine nucleotide exchange factor (GEF) 18 (ARHGEF18), mrna
30 Primer Design Dr. Michael Zuker s mfold applications/mfold/old/dna/ 55 o C
31 Primer Design Dr. Michael Zuker s mfold applications/mfold/old/dna/ 60 o C
32 Primer Design Dr. Michael Zuker s mfold applications/mfold/old/dna/ 65 o C
33 Primer Design Target Sequence 2 nd Structure Analysis Think Small Watch out for primer dimers Test in Real life conditions
34 Primer Design Remember: Keep things as simple and easy as possible
35 Primer Design Target Sequence 2 nd Structure Analysis Think Small Watch out for primer dimers Primer 3 Beacon Designer No-Web Next Test in Real life conditions
36 Primer Design Designs Primers Designs Internal Oligos Provides multiple outputs Free Web software provided by Steve Rozen and Whitehead Institute for Biomedical Research.
37 Primer Design Avoid Primer Dimers!!
38 Primer Design Target Sequence 2 nd Structure Analysis Think Small Watch out for primer dimers Test in Real life conditions
39 Non validated primers IL-1b plasmid with SYBR detection 5-fold dilution series: 10,000 to 16 copies No resolution below 2000 copies r = η = 153%
40 Non validated primers 10,000 copies 2,000 copies 400 copies No Template
41 Non validated primers Same primers with a specific probe Poor resolution Poor replicates η = 71%
42 Non validated primers After primer re-design to eliminate primer-dimers r = η = 91.3%
43 Beacon Designer
44 RTPrimerDB
45 Assay Optimization and Validation
46 Fast Assay optimization dynamic thermal gradient
47 Fast Assay optimization Gradient Master Mix 16 wells ul 360 ul total 180 ul 2X iq SYBR Supermix ul forward primer (200nM final) ul reverse primer (200nM final) ul DNA or cdna ul H ul total Vortex!
48 Fast Assay optimization dynamic thermal gradient 10 o C Above 6 o C Below
49 Fast Assay optimization Melt curve
50 Fast Assay optimization Amplification } Real annealing range
51 Proper annealing conditions translates into better uniformity
52 Example of 12 replicates
53 Example of 12 replicates
54 Example of 12 replicates
55 Example of 12 replicates
56 Example of 12 replicates
57 Example of 12 replicates
58 Example of 12 replicates
59 Example of 12 replicates
60 Example of 12 replicates
61 Validation
62 Validation 1/3 1/3 1/3 1/3 Blank 10.0 ng/2ul 1.11 ng/2ul 0.12 ng/2ul 3.33 ng/2ul 0.37 ng/2ul
63 Validation
64 Validation
65 Validation
66 Validation
67 Validation
68 Validation
69 Validation Control Sample A Sample B T
70 Validation
71 Validation Test reaction product 2 kb β Actin ODC AZI OAZ 200 bp 100 bp 50 bp
72 In a Hurry?
73 In a hurry? If you are in a hurry to develop an assay design two or more primer sets and use the pair that gives the best results. Use low levels of template Earliest Ct Reproducible technical replicates Remember that being in a hurry is no excuse for not optimizing and validating your assay!
74 In a hurry? NF2 NF1 Actin NR1 NR2 NF1 NR1 NF2 NR2 NF1 NR2 NF2 NR1
75 Selecting the best primer set NF1 NR1 NF2 NR2 NF1 NR2 NF2 NR1
76 Good Primers AMPLIFICATION Specificity Melting curve analysis and gel analysis PCR Efficiency Slope of standard curve Reproducibility Standard deviations between replicates Sensitivity and dynamic range Experimental validation
77 Thank You! Questions?
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