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7 protocols using qiaamp dna blood kit or tissue kit

1

DNA Extraction from Blood and Saliva

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DNA was extracted from peripheral blood or saliva from each SCZ, ASD, and control participant. For DNA extraction, we used the QIAamp DNA Blood Kit or Tissue Kit (Qiagen Ltd. Hilden, Germany). The quantity of extracted DNA was estimated using the Qubit® dsDNA BR Assay Kit (Life Technologies, Carlsbad, CA, USA) on a Qubit® 2.0 Fluorometer (Life Technologies, Carlsbad, CA, USA) following the manufacturer’s recommended protocol.
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2

Genomic DNA Extraction from Blood and Saliva

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Genomic DNA was extracted from peripheral blood or saliva from each SCZ, ASD and
control participant using the QIAamp DNA Blood Kit or Tissue Kit (Qiagen, Hilden,
Germany). The quantity of extracted DNA was estimated using the Qubit dsDNA BR
Assay Kit (Life Technologies, Carlsbad, CA, USA) on a Qubit 2.0 Fluorometer (Life
Technologies) following the manufacturer’s recommended protocol.
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3

Targeted Genomic Profiling from Whole Blood

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Genomic DNA was extracted from whole blood or saliva using the Qiagen QIAamp DNA blood kit or tissue kit (Qiagen, Hilden, Germany). Custom amplification primers were designed to span coding exons and flanking intron regions of the selected genes (transcription ID of RTN4R: ENST00000043402 from ensemble database; human reference sequence NCBI built 37) using the Ion AmpliSeq Designer (Thermo Fisher Scientific, Waltham, MA, USA). Sample amplification and equalization were achieved using Ion AmpliSeq Library Kits 2.0 and the Ion Library Equalizer Kit, respectively (Thermo Fisher Scientific). Amplified sequences were ligated with Ion Xpress Barcode Adapters (Thermo Fisher Scientific). Emulsion PCR and subsequent enrichment were performed using the Ion OneTouch Template Kit v2.0 on Ion OneTouch 2 and Ion OneTouch ES, respectively (Thermo Fisher Scientific). The final product was then sequenced on the Ion PGM sequencing platform (Thermo Fisher Scientific). Raw data output from the sequencer with the default setting; call quality ⩾20, read depth ⩾10 was uploaded to the Torrent Server (Life Technologies, Carlsbad, CA, USA) for variant calling with NCBI GRCh37 as a reference. The resulting VCF files were analyzed by Ingenuity Variant Analysis (Qiagen) for annotation and visualization.
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4

Whole Exome Sequencing of Autism Spectrum Disorder

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Genomic DNA was extracted from whole blood or saliva using a Qiagen QIAamp DNA blood kit or tissue kit (Qiagen, Hilden, Germany). Raw WES data were generated and processed to BAM files at three sites (Table S1): The Broad Institute (ASD = 256, HC = 299) [11 (link)] using Illumina HiSeq sequencers and an Illumina Nextera exome capture kit; Yokohama City University (ASD = 51) [14 (link)] using Illumina HiSeq with Agilent Sure Select v5; and Nagoya University (ASD = 2) using Illumina HiSeq with Agilent Sure Select v5. Detailed descriptions of each sequencing method are presented elsewhere [11 (link), 14 (link), 19 (link)]. Each sample’s sequencing reads were aligned onto the human genome build 37 (GRCh37/hg19) and then aggregated into a BAM file. Genomic variant call format (gVCF) files were generated using Haplotype Caller, version 4.1, in the Genome Analysis Toolkit (GATK) [20 (link)]. SNVs and insertions/deletions (indels) were jointly called across all samples (ASD = 309, HC = 299) using the GenotypeGVCF function.
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5

OLIG2 Gene Resequencing by Next-Gen Sequencing

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We used the QIAamp DNA blood kit or tissue kit (QIAGEN Ltd., Hilden, Germany) to extract genomic DNA from whole blood or saliva. We then used next-generation sequencing (NSC) technology on the Ion Torrent PGMTM to re-sequence the OLIG2 coding regions (Ensembl Transcript ID: ENST00000333337.3; Chr 21: 34,398,243-34,401,504;323 amino acids) according to protocols identified in the Ion AmpliSeqTM Library Preparation User Guide (Thermo Fisher Scientific, Waltham, MA, USA) and the Ion PGMTM Sequencing 200 Kit (Thermo Fisher Scientific). We first targeted specific PCR amplification and then prepared libraries to obtain 200-bp PCR fragments flanked by adaptor and barcode sequences; these sequences allowed sequencing and sample identification, respectively. The concentration of each library was determined using the Ion Library TaqMan Quantitation Assay Kit (Thermo Fisher Scientific). Amplified libraries were subjected to emulsion PCR and subsequent enrichment for template-positive Ion SphereTM particles (ISPs) using the Ion OneTouchTM system (Life Technologies, Carlsbad, CA, USA). ISPs were enriched and sequenced in a 200-bp configuration run using 318 chips (Life Technologies).
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6

Ion Torrent Targeted DNA Sequencing

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Genomic DNA was extracted from whole blood or saliva using the QIAGEN QIAamp DNA blood kit or tissue kit (QIAGEN Ltd., Germany). Custom amplification primers were designed to cover coding exons and flanking intron regions of the selected genes with Ion AmpliSeq Designer (Thermo Fisher Scientific, USA). Sample amplification and equalization were achieved using Ion AmpliSeq Library Kits 2.0 and the Ion Library Equalizer Kit, respectively (Thermo Fisher Scientific, USA). Amplified sequences were ligated with Ion Xpress Barcode Adapters (Thermo Fisher Scientific, USA). Emulsion PCR and subsequent enrichment were performed using the Ion OneTouch Template Kit v2.0 on Ion OneTouch 2 and Ion OneTouch ES, respectively (Thermo Fisher Scientific, USA). The final product was then sequenced on the Ion PGM sequencing platform (Thermo Fisher Scientific, USA). Raw data output from the sequencer was deposited in the DNA Data Bank of Japan (DDBJ) (http://www.ddbj.nig.ac.jp) under the accession number DRA004490, and uploaded to the Torrent Server (Life Technologies, USA) for variant calling, with NCBI GRCh37 as a reference. The resulting VCF files were analyzed by Ingenuity Variant Analysis (QIAGEN Ltd., Germany) for annotation and visualization.
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7

Next-Generation Sequencing of Genomic DNA

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Genomic DNA was extracted from whole blood or saliva using the QIAGEN QIAamp DNA blood kit or tissue kit (QIAGEN, Hilden, Germany). Custom amplification primers were designed, using Ion AmpliSeq Designer (Thermo Fisher Scientific, Waltham, MA, USA), to cover coding exons and flanking intron regions of the selected genes. Sample amplification and equalization were achieved using Ion AmpliSeq Library Kits 2.0 and the Ion Library Equalizer Kit, respectively (Thermo Fisher Scientific). Amplified sequences were ligated with Ion Xpress Barcode Adapters (Thermo Fisher Scientific). Emulsion PCR and subsequent enrichment were performed using the Ion OneTouch Template Kit v2.0 on Ion OneTouch 2 and Ion OneTouch ES, respectively (Thermo Fisher Scientific). The final product then was sequenced on the Ion PGM sequencing platform (Thermo Fisher Scientific). Raw data output from the sequencer was deposited in the DNA Data Bank of Japan (DDBJ) (http://www.ddbj.nig.ac.jp) under Accession Number DRA004490, and uploaded to the Torrent Server (Thermo Fisher Scientific) for variant calling, with NCBI GRCh37 as a reference. The resulting VCF (variant call format) files were analyzed by Ingenuity Variant Analysis (QIAGEN) for annotation and visualization. Combined Annotation Dependent Depletion (http://cadd.gs.washington.edu/) was applied for annotation of genetic variants.
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