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9 protocols using automate express forensic dna extraction system

1

Optimized DNA Extraction and STR Profiling

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DNA was extracted using The AutoMate ExpressTM Forensic DNA Extraction System with the PrepFilerTM Express BTA kit (Thermo Fisher Scientific, Darmstadt, Germany) to a 50-μL elution volume according to manufacturer’s instructions. Fluorometric DNA quantitation was performed using the Quantus™ Fluorometer with the QuantiFluor® dsDNA System (Promega, Walldorf, Germany) according to manufacturer’s instructions.
Additionally, triplicates of a human clavicle were processed according to the pig bone samples and stored for 10, 20, and 30 days and 35 °C in the substrate shown to result in the highest DNA recovery in pig bone. To check for STR profile quality, DNA from the positive control as well as the stored samples was amplified using the PowerPlex® ESX 17 (Promega, Mannheim, Germany) and the GlobalFiler™ PCR kits (Thermo Fisher Scientific, Darmstadt, Germany) according to manufacturer’s recommendations. The samples were analyzed using the 3130 Genetic Analyzer with the GeneMapper® ID software by Thermo Fisher Scientific.
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2

Oral Swab DNA Extraction and Quantification

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DNA was extracted from the oral swab samples of 50 individuals (men:42 individuals, women:8 individuals). All the individuals provided informed consent. Oral swabs were collected using clean DNA-free cotton swabs. The DNA was extracted using the PrepFiler Express TM Forensic DNA Extraction Kit (Thermo Fisher Scientific) and AutoMate Express TM Forensic DNA Extraction System (Thermo Fisher Scientific). The extract was quantified using the human genome quantification kit ver. 2 (TaKaRa) by the real-time PCR method using the 207 bp DNA sequence present at the D17Z1 locus as an index.
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3

DNA Extraction and Quantification Protocol

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In this study, three male DNA controls were used, including M308 (Bejing Microread Genetics, China), DNA007 (Thermo Fisher Scientific, USA), and 9948 (Thermo Fisher Scientific), whereas for female DNA control, an in‐house sample was used.
For noncontrol DNA samples, buccal swabs from in‐house staff were collected with informed consent. The DNA samples were extracted using the PrepFiler Express kit and the AutoMate Express Forensic DNA Extraction System (Thermo Fisher Scientific) and quantified using the Quantifiler Trio DNA Quantification Kit (Thermo Fisher Scientific) using the QuantStudio 5 Real‐Time PCR System (Thermo Fisher Scientific). All DNA samples were collected at the Dubai Health Authority laboratory voluntarily with an informed consent under ethical approval no. DSREC‐SR‐08/2018‐03.
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4

Nonhuman DNA Extraction and Amplification

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The specificity of the system was tested using DNA samples from human female and several animal species. Nonhuman samples were provided by Dubai Zoo as per Dubai Municipality authorization. DNA was extracted from the blood samples of Chimpanzees, male Gibbons and male Orang‐utans using the AutoMate Express Forensic DNA Extraction System (Thermo Fisher Scientific) according to the manufacture's protocol in the PrepFiler Express kit. After quantification (NanoDrop 2000/2000c,Thermo Fisher Scientific), 5 ng DNA was used in amplification.
A positive control test was run using DNA control standard 007 for confirmation.
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5

Genomic DNA Extraction and Quantification

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A total of 95 samples were collected (54 males and 41 females) from the central Indian population. The blood samples were collected from the participants after obtaining written informed consent. The peripheral liquid blood samples collected in K 2 EDTA vials were stored at 4 °C until further use. Genomic DNA was extracted from the blood samples by following recommended protocol of the manufacturer using AutoMate Express™ Forensic DNA Extraction System (Thermo Scientific, USA) and PrepFiler Express™ Forensic DNA Extraction Kit (Thermo Scientific, USA). Extracted genomic DNA was subjected to quantification using QuantStudio™ 5 Real-Time PCR System (Thermo Scientific, USA) using Quantifiler® Trio DNA Quantification Kit (Thermo Scientific, USA). Further, the DNA samples were normalized to 1.0 ng/µl in TE buffer and stored at -20 °C until further use.
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6

Rapid Swab-based DNA Extraction Protocol

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Samples were collected using a Copan 150C Cotton swab (Copan, Brescia, Italy) moistened with 100 μL of sterile distilled water applied using a plastic spray bottle technique (developed in Dubai police forensic DNA lab; every single spray contains approximately 50 μL). Full swab heads were used for extraction immediately after collection using the PrepFiler Express BTA™ kit with AutoMate Express Forensic DNA Extraction System according to the manufacturer's instructions (Thermo Fisher Scientific) and the final extracted sample elution was 50 μL.
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7

Automated DNA Extraction and Quantification

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Genomic DNA was extracted from all samples using the automated platform, Automate Express Forensic DNA Extraction System (Thermo Fisher Scientific Inc., Waltham, USA) with the Prepfiler Automated Forensic DNA Extraction System (Thermo Fisher Scientific Inc.). DNA extracts were quantified using the Quantifiler Trio Human DNA Quantification Kit (Thermo Fisher Scientific Inc.) on a 7500 Real-Time PCR System (Thermo Fisher Scientific Inc.). All procedures followed the manufacturers instructions, with elution volumes of 50 mL. A sample was considered not degraded/inhibited when the degradation index (DI) <1.5 and no IPCCT flag was triggered in Quantifiler Trio assay.
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8

Automated Forensic DNA Extraction

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Total DNA was extracted using the automated platform Automate Express Forensic DNA Extraction System (Thermo Fisher Scientific Inc.) with the Prepfiler Automated Forensic DNA Extraction System (Thermo Fisher Scientific Inc.), or manually via the DNA IQ System (Promega Corp., Madison, WI, USA). Autosomal DNA was quantified with the Quantifiler Human DNA Quantification Kit (Thermo Fisher Scientific Inc.) on a 7500 Real-Time PCR System (Thermo Fisher Scientific Inc.). MtDNA quantities were estimated using a 1:100 genomic to mitochondrial DNA copies ratio according to the product manual. All procedures followed the manufacturer´s instructions.
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9

Brazilian Population Genomic DNA Extraction

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Oral swabs or peripheral blood were obtained from 432 unrelated volunteer donors from all five different Brazilian geopolitical regions. Male contributors were preferred, in order to assure a significant sample size for investigation of SNPs located in the Y chromosome included in this study. Number of samples obtained from each Brazilian region and its States are presented in Supplementary Figure S1. Genomic DNA was extracted using the automated platform Automate Express Forensic DNA Extraction System (Thermo Fischer Scientific Inc.) with the Prepfiler Automated Forensic DNA Extraction System (Thermo Fischer Scientific Inc.), or manually using DNA IQ System (Promega Corp., Madison, WI, USA). DNA was quantified with the Quantifiler Human DNA Quantification Kit (Thermo Fischer Scientific Inc.) on a 7500 Real-Time PCR System (Thermo Fischer Scientific Inc.) or using Qubit 2.0 Fluorometer with Qubit dsDNA HS Assay Kit (Thermo Fischer Scientific Inc.). All procedures followed manu-facturer´s instructions.
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