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The author(s) shown below used Federal funding provided by the U.S. Department of Justice to prepare the following resource: Document Title: Development of A Comprehensive Genetic Tool For Identification of Cannabis Sativa Samples for Forensic and Intelligence Purposes Author(s): Rachel Michelle Houston Document Number: 254756 Date Received: May 2020 Award Number: 2015-R2-CX-0030 This resource has not been published by the U.S. Department of Justice. This resource is being made publically available through the Office of Justice Programs’ National Criminal Justice Reference Service. Opinions or points of view expressed are those of the author(s) and do not necessarily reflect the official position or policies of the U.S. Department of Justice. DEVELOPMENT OF A COMPREHENSIVE GENETIC TOOL FOR IDENTIFICATION OF CANNABIS SATIVA SAMPLES FOR FORENSIC AND INTELLIGENCE PURPOSES ___________ Dissertation Presented to The Faculty of the Department of Forensic Science Sam Houston State University ___________ In Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy in Forensic Science ___________ by Rachel Michelle Houston May, 2018 This resource was prepared by the author(s) using Federal funds provided by the U.S. Department of Justice. Opinions or points of view expressed are those of the author(s) and do not necessarily reflect the official position or policies of the U.S. Department of Justice. DEVELOPMENT OF A COMPREHENSIVE GENETIC TOOL FOR IDENTIFICATION OF CANNABIS SATIVA SAMPLES FOR FORENSIC AND INTELLIGENCE PURPOSES by Rachel Michelle Houston ___________ APPROVED: David Gangitano, PhD Committee Director Sheree Hughes-Stamm, PhD Committee Co-Director Sibyl Bucheli, PhD Committee Member Bobby LaRue, PhD Committee Member Phillip Lyons, PhD Dean, College of Criminal Justice This resource was prepared by the author(s) using Federal funds provided by the U.S. Department of Justice. Opinions or points of view expressed are those of the author(s) and do not necessarily reflect the official position or policies of the U.S. Department of Justice. DEDICATION To be written. iii This resource was prepared by the author(s) using Federal funds provided by the U.S. Department of Justice. Opinions or points of view expressed are those of the author(s) and do not necessarily reflect the official position or policies of the U.S. Department of Justice. ABSTRACT Houston, Rachel Michelle, Development of a comprehensive genetic tool for the identification of Cannabis sativa samples for forensic and intelligence purposes. Doctor of Philosophy (Forensic Science), May, 2018, Sam Houston State University, Huntsville, Texas. Cannabis sativa L. (marijuana) is the most commonly used illicit drug in the United States. Due to partial legalization, law enforcement faces a unique challenge in tracking and preventing flow of the legal marijuana to states where it is still illegal. Moreover, significant illegal C. sativa traffic from Mexico exists at the US border. To date, no DNA method for cannabis using short tandem repeat (STR) markers following International Society of Forensic Genetics (ISFG) or Scientific Working Group on DNA Analysis Methods (SWGDAM) recommendations has been reported (i.e., use of sequenced allelic ladder, use of tetra-nucleotide STR markers). In addition, there is no reported cannabis STR reference population database that can be used for forensic purposes (i.e. population in Hardy-Weinberg and linkage equilibrium). There have been limited chloroplast (cpDNA) and mitochondrial DNA (mtDNA) studies investigating C. sativa haplotypes in the Americas. Lastly, massively parallel sequencing (MPS) technology has not yet been applied to targeted sequencing of C. sativa for forensic purposes. This project explores the forensic genetic issues associated with the identification and origin determination of C. sativa. Results provide the forensic genetic community a comprehensive genetic tool (STR, cpDNA, mtDNA, and MPS) that allows for the individualization of cannabis samples, the association of different cases as well as origin determination of samples for forensic and intelligence purposes. A previously reported 15-loci STR multiplex was evaluated. Results of the evaluation indicated that this STR system is not suitable for forensic identification due to iv This resource was prepared by the author(s) using Federal funds provided by the U.S. Department of Justice. Opinions or points of view expressed are those of the author(s) and do not necessarily reflect the official position or policies of the U.S. Department of Justice. several issues: high heterozygote peak imbalance in some markers, overlapping alleles between two closely located STR markers, high stutter peaks in dinucleotide markers, inter-loci peak imbalance and presence of null alleles in four of the markers. A novel 13-loci STR multiplex was developed and optimized for C. sativa identification (3500 Genetic analyzer), according to ISFG and SWGDAM recommendations, using primer and multiplex STR design software, and a gradient PCR approach for optimal annealing temperature determination. This STR multiplex was validated according SWGDAM guidelines. Case-to-case comparisons were performed by phylogenetic analysis using the Unweighted Pair Group Method with Arithmetic Mean (UPGMA) method and parsimony analysis with statistically significant differences detected using pair-wise genetic-distance comparisons. Homogeneous subpopulations (low FST) were determined by phylogenetic analysis and confirmed by bootstrap analysis (95% confidence interval). Results revealed a homogeneous subpopulation that could be used as a cannabis reference STR population database (N=101) with parameters of population genetics (observed heterozygosity, expected heterozygosity, Hardy-Weinberg equilibrium, and linkage disequilibrium) and of forensic interest (allele frequencies and power of discrimination), A previously reported multi-loci system was modified and optimized to genotype five chloroplast and two mitochondrial markers. For this purpose, two methods were designed: a homopolymeric STR pentaplex and a SNP triplex with one chloroplast (Cscp001) marker shared by both methods for quality control. For successful mitochondrial and chloroplast typing, a novel real-time PCR quantitation method was developed and validated to accurately estimate the quantity of the chloroplast DNA (cpDNA) using a v This resource was prepared by the author(s) using Federal funds provided by the U.S. Department of Justice. Opinions or points of view expressed are those of the author(s) and do not necessarily reflect the official position or policies of the U.S. Department of Justice. synthetic DNA standard. Moreover, a sequenced allelic ladder was also designed for accurate genotyping of the homopolymeric STR pentaplex. And finally, as a proof of concept, a custom panel for MPS was designed to interrogate 12 cannabis-specific STR loci by sequence rather than by size. A simple workflow was designed to integrate the custom PCR multiplex into a workflow compatible with the Ion Plus Fragment Library Kit, Ion Chef, and Ion S5 system. For data sorting and sequence analysis, a custom configuration file was designed for STRait Razor v3 to parse and extract STR sequence data. The study resulted in a preliminary investigation of sequence variation for 12 autosomal STR loci in 16 cannabis samples. Results revealed intra-repeat variation in eight loci where the nominal or size-based allele was identical, but variances were discovered by sequence. In addition, full concordance was observed between the MPS and capillary electrophoresis (CE) data. Although the panel was not fully optimized and only a small number of samples were evaluated, this study demonstrated that more informative STR typing can successfully be performed on a MPS platform. KEY WORDS: Forensic DNA, Cannabis sativa, Short tandem repeats, Massively parallel sequencing, Forensic plant science vi This resource was prepared by the author(s) using Federal funds provided by the U.S. Department of Justice. Opinions or points of view expressed are those of the author(s) and do not necessarily reflect the official position or policies of the U.S. Department of Justice. ACKNOWLEDGEMENTS This dissertation was partially funded by a Graduate Research Fellowship Award #2015-R2-CX-0030 (National Institute of Justice, Office of Justice Programs, U.S. Department of Justice). The opinions, findings, conclusions, or recommendations expressed in this presentation are those of the authors and do not necessarily reflect those of the National Institute of Justice. The author would like to thank all staff and personnel at the U.S. Customs and Border Protection LSSD Southwest Regional Science Center for their great assistance and help with this project. The author would also like to thank Roberta Marriot and Alejandra Figueroa for their kind donation of marijuana DNA extracts. Lastly, the authors greatly appreciate Haleigh Agot for her assistance with the chloroplast quantitation method. vii This resource was prepared by the author(s) using Federal funds provided by the U.S. Department of Justice. Opinions or points of view expressed are those of the author(s) and do not necessarily reflect the official position or policies of the U.S. Department of Justice. TABLE OF CONTENTS Page DEDICATION ................................................................................................................... iii ABSTRACT ......................................................................................................................
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