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6 protocols using herculase 2 fusion dna polymerase kit

1

Nested PCR Amplification of Gene Sequence

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For amplification a nested PCR approach was chosen. The Herculase II Fusion DNA Polymerase Kit (Agilent Technologies) was used in a 25 μL reaction volume. 24 μL of Master Mix were mixed with 1 μL of extracted patient gDNA or purified first PCR. Each PCR was carried out in triplicates to normalize for PCR amplification bias. First PCR included sense primer F-6553 5′- ATGGGATCAAAGCCTAAAGCCATGTG-3′ and R-7801 5′- AGTGCTTCCTGCTGCTCCCAAGAACCCAAG-3′. Following cycling conditions were used: initial 3 min at 95°C, 30 cycles of denaturation for 15 s at 95°C, annealing for 20 s at 60°C and extension for 45 s at 72°C. Final extension was done for 3 min at 72°C.
The second PCR included sense primer F-6848 (5′- AGGCCTGTCCAAAGGTATCCTTTGA-3′; second PCR) and antisense primer R- 7371 (5′- TTACAGTAGAAAAATTCCCCTCCACAATTAAA-3′; second PCR). Cycling conditions for the second PCR were the same as for the first PCR except an annealing temperature of 56°C for 20 s.
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2

Targeted Sequencing Library Preparation

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The following materials were used in this study: QIAGEN QlAampDNA Mini Kit (Qiagen, Valencia, Germany); QIAGEN QlAampBlood Mini Kit (Qiagen, Valencia, Germany); Ion Xpress Plus Fragment Library Kit (Life Technologies, New York, USA); Agencourt AMPure XP Kit (Beckman, USA); H2O (Sigma-Aldrich, USA); Thermo NanoDrop 1000 (Thermo, MA, USA); SureSelect Target Enrichment System for Sequencing on Ion-Proton (Agilent Technologies, USA) ; SureSelect TE Reagent Kit, PTN (Agilent Technologies, USA); Herculase II Fusion DNA Polymerase kit (Agilent Technologies, USA); Ion OneTouch 2 System (Life Technologies, New York, USA); Qubit 2.0 (Life Technologies, New York, USA); Ion PI Template OT2 200 Kit v2 (Life Technologies, New York, USA); Ion PI Sequencing 200 Kit v2 (Life Technologies, New York, USA); ABI 3730xl Sequencing Machine (Life Technologies, New York, USA); and PCR machine (Life Technologies, New York, USA); QIAxcel Bioanalyzer (Qiagen, Valencia, Germany); ABI Ion-Proton Sequencing Machine (Life Technologies, New York, USA).
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3

YN1mAb Hybridoma DNA Extraction and Sequencing

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The YN1mAb hybridoma genomic DNA was extracted using GeneJet genomic DNA purification kit from Thermo Fisher Scientific (Waltham, MA). PCR analysis was carried out using primers covering the C-terminal end of the YN1mAb. Herculase II Fusion DNA Polymerase Kit from Agilent Technologies (Santa Clara, CA) was used for PCR analysis. The PCR amplicons were run on a 2% (wt/vol) agarose gel and stained with ethidium bromide. Sanger sequencing was carried out for confirmation of the insert.
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4

Generation of CVB3 Infectious Clones

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To generate a non-reporter wild type infectious clone of CVB3 [strain Woodruff, also known as H3 strain], the total RNA from wild type CVB3 infected cells was extracted. Subsequently, the cDNA was generated using SuperScript IV First-Strand Synthesis System (Invitrogen, Cat#18091050) to be template. Then, we used PCR to clone the full length CVB3 genome using Herculase II Fusion DNA Polymerase kit (Agilent Technologies, Inc., Cat#600675), and cloned it into pCR-BluntII-TOPO vector (Invitrogen, Cat#K280002). This plasmid was named pCRII-T7-CVB3. The constructs were sequenced to verify the original sequence. The 2C mutated CVB3 used in this study was engineered by using overlap PCR to generate a fragment containing the mutation, then inserted into CVB3 infectious cDNA constructs using SpeI and PmlI.
For CVB3 replicon constructs, we modified pCVB3-eGFP infectious clone (Feuer et al., 2002 (link)) by inserting Rluc2A coding sequence using BstBI and NdeI restriction sites. The wild type CVB3 replicon was termed pCVB3-Rluc2A-RepWT. To make a replication-deficient replicon, the codons of the GDD polymerase active site “ggt gac gat” in viral 3D gene were replaced with “acg cgt”, which encodes amino acids TR, and is recognized by restriction enzyme MluI. This plasmid was named pCVB3-RLuc2A-RepMut.
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5

Nanopore Sequencing Amplicon Generation

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Amplicons for the nanopore sequencing were generated using the Herculase II fusion DNA Polymerase kit (Agilent, Waldbronn, Germany) following the manufacturer’s protocol. The whole genomic region was divided into 10-15 kb fragments, which were amplified in both strains (RS5346 “no ubas” and RSA016 “high ubas”) using specific primers (see Key Resources Table). Primer design was carried out using Geneious software (version 8.0.1). In brief, the conditions for PCR experiment were the following: initial denaturation for 2 minutes at 95 °C, ten cycles of denaturation at 95 °C for 20 seconds, annealing at 60°C for 20 seconds, and extension at 68 °C for 8 min, followed by 20 cycles of denaturation at 95°C for 20 seconds, annealing at 60 °C for 20 seconds, and extension at 68 °C 8 min, plus 20 seconds longer per cycle and a final extension 68°C for 8 minutes.
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6

Genomic DNA Extraction and Sequencing

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Tissue genomic DNA extraction kit DP304 (TIANGEN), KAPA HyperPlus Kits (Roche), HyperCap Bead Kit (Roche), SureSelect Target Enrichment Kit ILM Indexing Hyb Module Box 2 (Agilent), PlateLoc Thermal Microplate Sealer (Agilent), Herculase II Fusion DNA Polymerase Kit (Agilent), Sequencing and Library Building Platform (IIIumina USA) were used.
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