1
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Hudson BC, Dawson Green T. Modified differential lysis for sexual assault samples using a combined enzymatic and alkaline approach. Forensic Sci Res 2024; 9:owae022. [PMID: 38831792 PMCID: PMC11146638 DOI: 10.1093/fsr/owae022] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2023] [Accepted: 03/28/2024] [Indexed: 06/05/2024] Open
Abstract
Sexual assault sample processing, despite recent funding and research efforts, remains time-consuming, labourious, and inefficient. These limitations, combined with the prevalence of sexual assaults, have prompted the need to develop a cheaper, quicker, and more robust method for separating victim and perpetrator contributions within sexual assault evidence so that analysts can keep pace with submissions and cases can be resolved in a timely manner. Thus, this study examined the use of a combined enzymatic and alkaline approach for differential cell lysis-with the goal of developing a quick, cheap, and more efficient DNA isolation method. Quantification results for this assay revealed that (72.0 ± 18.3)%, (15.8 ± 14.2)%, and (29.5 ± 23.7)% of total DNA were retained in sperm fractions for neat semen, neat vaginal, and semen-vaginal mixture eluates, respectively. Short tandem repeat (STR) analysis of mixture samples processed with this technique exhibited sperm fraction DNA profiles with mean male-to-female ratios of 1.74:1, which was a 3.01 ± 2.30-fold improvement in male-to-female ratios and led to the recovery of 5.90 ± 7.80 unshared male contributor alleles in sperm fractions that were otherwise undetected in unseparated controls. Overall, this study presented a modified differential lysis approach using prepGEM™ and sodium hydroxide treatments that can accomplish cell elution and fractional lysis within 25 min. Future studies should investigate alternative "non-sperm" cell lysis methods to enhance lysis efficiency and minimize the potential for inhibition, as well as the optimization and automation of this technique. Key points Traditional sexual assault sample processing methods are time-consuming and inefficient.This modified differential lysis method produces lysates with sufficient DNA yield and quality.A combined technique using enzymatic and alkaline lysis can accomplish fractional separation.Lysis with prepGEM and NaOH absent purification is compatible with downstream processes.
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Affiliation(s)
- Brittany C Hudson
- Department of Forensic Science, Virginia Commonwealth University, Richmond, VA, USA
- Integrative Life Sciences, Virginia Commonwealth University, Richmond, VA, USA
| | - Tracey Dawson Green
- Department of Forensic Science, Virginia Commonwealth University, Richmond, VA, USA
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2
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Kubo S, Niimi H, Kitajima I. Loop-mediated isothermal amplification assay for fluorescence analysis and lateral flow detection of male DNA. Anal Biochem 2023; 664:115029. [PMID: 36572215 DOI: 10.1016/j.ab.2022.115029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 12/07/2022] [Accepted: 12/20/2022] [Indexed: 12/25/2022]
Abstract
Male DNA screening is important in forensic investigations, such as sexual assault cases. Although quantitative real-time PCR is a robust method for detection of male DNA, it is time-consuming and labor-intensive. We herein report the development of a male DNA-targeted loop-mediated isothermal amplification (LAMP) assay that can be used for both laboratory-based fluorescence analysis and on-site lateral flow detection. The two detection systems are independent, but we streamlined the reaction before the detection by introducing a fluorescence probe and biotin-labeled primer into a single reaction. This allowed the evaluation of fluorescence signal followed by lateral flow detection. Both the fluorescence and lateral flow analyses detected as low as 10 pg of male DNA. We also integrated an alkaline lysis method with our LAMP assay. The direct assay successfully detected male DNA from forensic samples without purification. The workflow requires only <40 min for fluorescence analysis and <45 min for lateral flow detection. Furthermore, when combined with a lateral flow strip, this workflow does not require any sophisticated instruments. These findings suggest that our assay is a promising strategy for on-site male DNA screening as well as laboratory-based testing.
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Affiliation(s)
- Seiji Kubo
- Department of Clinical Laboratory and Molecular Pathology, Faculty of Medicine, Academic Assembly, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan; Forensic Science Laboratory, Ishikawa Prefectural Police Headquarters, 1-1 Kuratsuki, Kanazawa, 920-8553, Japan.
| | - Hideki Niimi
- Department of Clinical Laboratory and Molecular Pathology, Faculty of Medicine, Academic Assembly, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan.
| | - Isao Kitajima
- Administrative office, University of Toyama, 3190 Gofuku, Toyama, 930-8555, Japan
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3
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Kubo S, Niimi H, Kitajima I. Rapid and direct detection of male DNA by recombinase polymerase amplification assay. Forensic Sci Int Genet 2022; 59:102704. [DOI: 10.1016/j.fsigen.2022.102704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 03/31/2022] [Accepted: 04/01/2022] [Indexed: 11/04/2022]
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Sinha SK, Brown H, Holt H, Khan MR, Brown R, Sgueglia JB, Loftus A, Murphy G, Montgomery A. Development and validation of a novel method "SpermX™" for high throughput differential extraction processing of sexual assault kits (SAKs) for DNA analysis. Forensic Sci Int Genet 2022; 59:102690. [PMID: 35338894 DOI: 10.1016/j.fsigen.2022.102690] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2021] [Revised: 03/11/2022] [Accepted: 03/16/2022] [Indexed: 11/30/2022]
Abstract
The Sperm X method uses a nanotechnology derived polymer membrane that functions as a separation medium to effectively trap sperm cells while enabling efficient flow through of the digested epithelial cell DNA. This specialized membrane enabled development of a method that could significantly increase a forensic laboratory's ability to obtain male sperm fraction DNA profiles. The SpermX device provides a rapid, reproducible procedure that is easy to implement in a single-tube format as well as high-throughput truly automated hands-free workflows. Validation studies, performed using the manual SpermX method, include sensitivity, stability, precision (reproducibility and repeatability), mixtures, and a method comparison to the traditional differential extraction. Sensitivity and method comparison studies demonstrated a wide range of sperm cells, from a high of over 2.78 million cells (9158 ng) to a low of 25 cells (83 pg), can be trapped by the SpermX membrane. Stability studies on various substrates (i.e., carpet, cotton, denim, polyester, and silk) and degraded semen gave the expected male DNA profiles. Data from the same operator and a different operator were consistent with low variance. Mixtures, with ratios ranging from approximately 10:1-18182:1, created to simulate real casework type samples including buccal/semen, vaginal epithelial/semen, and post coital swabs at different time intervals, were tested. A comparison of the SpermX method to the conventional differential extraction method resulted in comparable probative male profile allelic data and associated statistical probabilities. For low level sperm samples, down to 25 sperm cells (83 pg), the SpermX method outperformed the conventional differential extraction with more genotypic information and associated probabilities.
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Affiliation(s)
- Sudhir K Sinha
- InnoGenomics Technologies, LLC. 2000 Lakeshore Dr #5016, New Orleans, LA 70148, USA.
| | - Hiromi Brown
- InnoGenomics Technologies, LLC. 2000 Lakeshore Dr #5016, New Orleans, LA 70148, USA
| | - Hailey Holt
- InnoGenomics Technologies, LLC. 2000 Lakeshore Dr #5016, New Orleans, LA 70148, USA
| | - Mah-Ro Khan
- InnoGenomics Technologies, LLC. 2000 Lakeshore Dr #5016, New Orleans, LA 70148, USA
| | - Ryan Brown
- InnoGenomics Technologies, LLC. 2000 Lakeshore Dr #5016, New Orleans, LA 70148, USA
| | - Joanne B Sgueglia
- InnoGenomics Technologies, LLC. 2000 Lakeshore Dr #5016, New Orleans, LA 70148, USA
| | - Andrew Loftus
- InnoGenomics Technologies, LLC. 2000 Lakeshore Dr #5016, New Orleans, LA 70148, USA
| | - Gina Murphy
- InnoGenomics Technologies, LLC. 2000 Lakeshore Dr #5016, New Orleans, LA 70148, USA
| | - Anne Montgomery
- InnoGenomics Technologies, LLC. 2000 Lakeshore Dr #5016, New Orleans, LA 70148, USA
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Schellhammer SK, Hudson BC, Cox JO, Dawson Green T. Alternative direct‐to‐amplification sperm cell lysis techniques for sexual assault sample processing. J Forensic Sci 2022; 67:1668-1678. [PMID: 35285573 PMCID: PMC9314082 DOI: 10.1111/1556-4029.15027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 02/13/2022] [Accepted: 02/28/2022] [Indexed: 11/26/2022]
Abstract
The prevalence of sexual assault cases and increasingly sensitive DNA analysis methods have resulted in sexual assault kit backlogs in the United States. Although traditional DNA extraction and purification utilizing detergents, proteinase K, and DTT have been the primary technique for lysing sperm cell fractions from these samples, it is labor‐intensive and inefficient regarding time and sperm DNA recovery – hindering the ability of forensic analysts to keep pace with evidence submissions. Thus, this study examined seven alternative sperm cell lysis techniques to develop a method that could efficiently lyse sperm and consistently generate high‐quality profiles while also reducing time, labor, and cost requirements. Microscopic examination of lysates indicated only Casework Direct and alkaline techniques could lyse all spermatozoa within samples, while quantification results demonstrated all methods performed comparably to the control method of forensicGEM™ Sperm (p > 0.06). Amplification with 0.25 ng DNA revealed that unpurified lysates from Casework Direct, alkaline, and NP‐40 techniques produced DNA profiles with acceptable mean STR peak heights and interlocus balance, both of which were similar to or better than the control. Overall, this study demonstrated the ability of Casework Direct, alkaline, and NP‐40 methods to efficiently lyse spermatozoa and provide high‐quality STR profiles despite the absence of a purification step. Ultimately, based on the data reported herein, alkaline lysis is the recommended alternative sperm lysis approach given its ability to generate high‐quality profiles, save time, and decrease the cost per reaction when compared to traditional sperm cell lysis methods.
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Affiliation(s)
- Sarah K. Schellhammer
- Department of Forensic Science Virginia Commonwealth University Richmond Virginia USA
| | - Brittany C. Hudson
- Department of Forensic Science Virginia Commonwealth University Richmond Virginia USA
- Integrative Life Sciences Virginia Commonwealth University Richmond Virginia USA
| | - Jordan O. Cox
- Department of Forensic Science Virginia Commonwealth University Richmond Virginia USA
| | - Tracey Dawson Green
- Department of Forensic Science Virginia Commonwealth University Richmond Virginia USA
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Kang J, Li Y, Zhao Y, Wang Y, Ma C, Shi C. Nucleic acid extraction without electrical equipment via magnetic nanoparticles in Pasteur pipettes for pathogen detection. Anal Biochem 2021; 635:114445. [PMID: 34740597 PMCID: PMC8562038 DOI: 10.1016/j.ab.2021.114445] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 09/26/2021] [Accepted: 10/30/2021] [Indexed: 12/15/2022]
Abstract
The outbreak of COVID-19 makes epidemic prevention and control become a growing global concern. Nucleic acid amplification testing (NAAT) can realize early and rapid detection of targets, thus it is considered as an ideal approach for detecting pathogens of severe acute infectious diseases. Rapid acquisition of high-quality target nucleic acid is the prerequisite to ensure the efficiency and accuracy of NAAT. Herein, we proposed a simple system in which magnetic nanoparticles (MNPs) based nucleic acid extraction was carried out in a plastic Pasteur pipette. Different from traditional approaches, this proposed system could be finished in 15 min without the supports of any electrical instruments. Furthermore, this system was superior to traditional MNPs based extraction methods in the aspects of rapid extraction and enhancing the sensitivity of a NAAT method, accelerated denaturation bubbles mediated strand exchange amplification (ASEA), to the pathogens from various artificial samples. Finally, this Pasteur pipette system was utilized for pathogen detection in actual samples of throat swabs, cervical swabs and gastric mucosa, the diagnosis results of which were identical with that provided by hospital. This rapid, easy-performing and efficiency extraction method ensures the applications of the NAAT in pathogen detection in regions with restricted resources.
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Affiliation(s)
- Jia Kang
- Qingdao Nucleic Acid Rapid Testing International Science and Technology Cooperation Base, College of Life Sciences, Department of Pathogenic Biology, School of Basic Medicine, And Department of Clinical Laboratory, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, 266071, PR China
| | - Yang Li
- Qingdao Nucleic Acid Rapid Testing International Science and Technology Cooperation Base, College of Life Sciences, Department of Pathogenic Biology, School of Basic Medicine, And Department of Clinical Laboratory, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, 266071, PR China
| | - Yan Zhao
- Qingdao Nucleic Acid Rapid Testing International Science and Technology Cooperation Base, College of Life Sciences, Department of Pathogenic Biology, School of Basic Medicine, And Department of Clinical Laboratory, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, 266071, PR China
| | - Yanling Wang
- Qingdao Nucleic Acid Rapid Testing International Science and Technology Cooperation Base, College of Life Sciences, Department of Pathogenic Biology, School of Basic Medicine, And Department of Clinical Laboratory, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, 266071, PR China
| | - Cuiping Ma
- Shandong Provincial Key Laboratory of Biochemical Engineering, Qingdao Nucleic Acid Rapid Detection Engineering Research Center, College of Marine Science and Biological Engineering, Qingdao University of Science and Technology, Qingdao, 266042, PR China
| | - Chao Shi
- Qingdao Nucleic Acid Rapid Testing International Science and Technology Cooperation Base, College of Life Sciences, Department of Pathogenic Biology, School of Basic Medicine, And Department of Clinical Laboratory, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, 266071, PR China,Corresponding author
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7
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Nucleic acid extraction: Fundamentals of sample preparation methodologies, current advancements, and future endeavors. Trends Analyt Chem 2020. [DOI: 10.1016/j.trac.2020.115985] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Wright SN, Huge BJ, Dovichi NJ. Capillary zone electrophoresis separation and collection of spermatozoa for the forensic analysis of sexual assault evidence. Electrophoresis 2020; 41:1344-1353. [PMID: 32453860 DOI: 10.1002/elps.201900455] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Revised: 04/29/2020] [Accepted: 05/21/2020] [Indexed: 01/23/2023]
Abstract
The processing of sexual assault kits (SAKs) relies on the genetic analysis of material extracted from swabs collected from the assault victim. A vital step in producing an identifiable DNA profile of the perpetrator is the effective separation of perpetrator (sperm) and victim (epithelial) DNA that have been isolated from the collected evidence. We report the use of capillary zone electrophoresis for the separation of intact sperm from whole and lysed epithelial cells in SAKs. The separated components are deposited into wells of a microtiter plate using a computer-controlled fraction collector, and quantitative PCR is used to verify the collection of sperm cells by targeted amplification of male DNA. We present results from simulated sexual assault samples that have been aged for up to 18 months, as well as vaginal swabs from authentic forensic kits. Components extracted from the vaginal swabs from the SAK comigrated with an aged semen sample at 6.25 ± 0.25 min. Epithelial cells migrated from 10-12 min, producing baseline resolution of the components. Sperm cells were collected in a microtiter plate for downstream analysis.
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Gregório I, García-Ruiz C, Martínez P. Maximizing semen extraction from sanitary pads by chemical and shredding treatments. Forensic Sci Int Genet 2019; 42:198-202. [PMID: 31376647 DOI: 10.1016/j.fsigen.2019.07.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Revised: 07/11/2019] [Accepted: 07/21/2019] [Indexed: 12/29/2022]
Abstract
Evidence of sexual aggression may be obtained from superabsorbent polymer (SAP) sanitary pads, which are used by forensic laboratories for semen evaluation. Semen can be extracted from their upper layers, which are free of SAPs. However, our previous results showed a need to optimize the protocol for semen analysis by considering its extraction from the lower core, often composed of sodium polyacrylate SAPs. SAPs generate a hydrogel, which traps the cellular components, hindering the possibility of obtaining cells and hence their genetic material. Simple filtration has been tried previously, but further maximization by application of a treatment has never been attempted. In this paper, we compare both chemical and physical shredding treatments for maximizing gel-trapped sperm and male cell DNA recaptures from hygienic superabsorbent substrates in sanitary pads, panty-liners or diapers. Our findings suggest that the lower core should be treated to induce a dewaterisation of the SAP hydrogels in order to maximize the extraction of bodily fluids.
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Affiliation(s)
- Inês Gregório
- National Institute of Toxicology & Forensic Science (INTCF), José Echegaray 4, 28232 Las Rozas-Madrid, Spain; Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, University Research Institute for Police Sciences (IUICP), University of Alcalá, Ctra. Madrid-Barcelona km 33.6, 28871 Alcalá de Henares-Madrid, Spain.
| | - Carmen García-Ruiz
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, University Research Institute for Police Sciences (IUICP), University of Alcalá, Ctra. Madrid-Barcelona km 33.6, 28871 Alcalá de Henares-Madrid, Spain
| | - Pilar Martínez
- National Institute of Toxicology & Forensic Science (INTCF), José Echegaray 4, 28232 Las Rozas-Madrid, Spain.
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Clark CP, Xu K, Scott O, Hickey J, Tsuei AC, Jackson K, Landers JP. Acoustic trapping of sperm cells from mock sexual assault samples. Forensic Sci Int Genet 2019; 41:42-49. [DOI: 10.1016/j.fsigen.2019.03.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Revised: 03/01/2019] [Accepted: 03/16/2019] [Indexed: 02/06/2023]
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11
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Harper KA, Meiklejohn KA, Merritt RT, Walker J, Fisher CL, Robertson JM. Isolation of Mitochondrial DNA from Single, Short Hairs without Roots Using Pressure Cycling Technology. SLAS Technol 2017; 23:97-105. [PMID: 28977757 DOI: 10.1177/2472630317732073] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Hairs are commonly submitted as evidence to forensic laboratories, but standard nuclear DNA analysis is not always possible. Mitochondria (mt) provide another source of genetic material; however, manual isolation is laborious. In a proof-of-concept study, we assessed pressure cycling technology (PCT; an automated approach that subjects samples to varying cycles of high and low pressure) for extracting mtDNA from single, short hairs without roots. Using three microscopically similar donors, we determined the ideal PCT conditions and compared those yields to those obtained using the traditional manual micro-tissue grinder method. Higher yields were recovered from grinder extracts, but yields from PCT extracts exceeded the requirements for forensic analysis, with the DNA quality confirmed through sequencing. Automated extraction of mtDNA from hairs without roots using PCT could be useful for forensic laboratories processing numerous samples.
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Affiliation(s)
- Kathryn A Harper
- 1 Counterterrorism and Forensic Science Research Unit, Visiting Scientist Program, Federal Bureau of Investigation Laboratory Division, Quantico, VA, USA
| | - Kelly A Meiklejohn
- 1 Counterterrorism and Forensic Science Research Unit, Visiting Scientist Program, Federal Bureau of Investigation Laboratory Division, Quantico, VA, USA
| | - Richard T Merritt
- 2 DNA Support Unit, Federal Bureau of Investigation Laboratory Division, Quantico, VA, USA
| | - Jessica Walker
- 3 Trace Evidence Unit, Federal Bureau of Investigation Laboratory Division, Quantico, VA, USA
| | - Constance L Fisher
- 4 DNA Casework Unit, Federal Bureau of Investigation Laboratory Division, Quantico, VA, USA
| | - James M Robertson
- 5 Counterterrorism and Forensic Science Research Unit, Federal Bureau of Investigation Laboratory Division, Quantico, VA, USA
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Martinez V, Nori D, Dimsoski P, McCord B. Pressure-based alkaline lysis with immunocapture, a method for enhanced recovery in differential extraction. Electrophoresis 2017; 38:2777-2785. [DOI: 10.1002/elps.201700139] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Revised: 07/03/2017] [Accepted: 07/05/2017] [Indexed: 01/30/2023]
Affiliation(s)
- Vanessa Martinez
- Department of Chemistry and Biochemistry; Florida International University; Miami FL USA
| | - Deepthi Nori
- Department of Chemistry and Biochemistry; Florida International University; Miami FL USA
| | - Pero Dimsoski
- Department of Chemistry and Biochemistry; Florida International University; Miami FL USA
| | - Bruce McCord
- Department of Chemistry and Biochemistry; Florida International University; Miami FL USA
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Faggion H, Benincá C, Naviglio D, Pedersen Voll FA, Zanoelo EF. Kinetics of Pressure Cycling Extraction of Solute from Leaves of Mate (Ilex paraguariensis) Dispersed in Water. CHEM ENG COMMUN 2016. [DOI: 10.1080/00986445.2016.1273834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Heron Faggion
- Graduate Program of Food Engineering, Federal University of Paraná, Curitiba, Brazil
| | - Cristina Benincá
- School of Chemistry and Food, Federal University of Rio Grande, Santo Antônio da Patrulha, Brazil
| | - Daniele Naviglio
- Department of Chemical Sciences, University of Naples Federico II, Naples, Italy
| | | | - Everton Fernando Zanoelo
- Graduate Program of Food Engineering, Federal University of Paraná, Curitiba, Brazil
- Department of Chemical Engineering, Federal University of Paraná, Curitiba, Brazil
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Planella L, Heras S, Vera M, García-Marín JL, Roldán MI. An optimized high quality male DNA extraction from spermatophores in open thelycum shrimp species. Integr Zool 2016; 12:421-427. [PMID: 27991721 DOI: 10.1111/1749-4877.12250] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The crucial step of most of the current genetic studies is the extraction of DNA of sufficient quantity and quality. Several genomic DNA isolation methods have been described to successfully obtain male DNA from shrimp species. However, all current protocols require invasive handling methods with males for DNA isolation. Using Aristeus antennatus as a model we tested a reliable non-invasive differential DNA extraction method to male DNA isolation from spermatophores attached to female thelycum. The present protocol provides high quality and quantity DNA for polymerase chain reaction amplification and male genotyping. This new approach could be useful to experimental shrimp culture to select sires with relevant genetic patterns for selective breeding programs. More importantly, it can be applied to identify the mating pairs and male structure in wild populations of species as A. antennatus, where males are often difficult to capture. Our method could be also valuable for biological studies on other spermatophore-using species, such as myriapods, arachnids and insects.
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Affiliation(s)
- Laia Planella
- Laboratory of Genetic Ichthyology, University of Girona, Girona, Spain
| | - Sandra Heras
- Laboratory of Genetic Ichthyology, University of Girona, Girona, Spain
| | - Manuel Vera
- Laboratory of Genetic Ichthyology, University of Girona, Girona, Spain
| | | | - María Inés Roldán
- Laboratory of Genetic Ichthyology, University of Girona, Girona, Spain
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