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International Journal of Legal Medicine

, Volume 133, Issue 2, pp 373–384 | Cite as

13-loci STR multiplex system for Brazilian seized samples of marijuana: individualization and origin differentiation

  • Mauro Sander Fett
  • Roberta Fogliatto MariotEmail author
  • Eduardo Avila
  • Clarice Sampaio Alho
  • Valdir Marcos Stefenon
  • Flávio Anastácio de Oliveira Camargo
Original Article

Abstract

It is known that Cannabis in Brazil could either originate from Paraguay or be cultivated in Brazil. While consumer markets in the North and Northeast regions are maintained by national production, the rest of the country is supplied with Cannabis from Paraguay. However, the Brazilian Federal Police (BFP) has exponentially increased the seizure number of Cannabis seeds sent by mail. For this reason, the aim of the study was to assess the 13-loci short tandem repeat (STR) multiplex system proposed by Houston et al. (2015) to evaluate the power of such markers in individualization and origin differentiation of Cannabis sativa samples seized in Brazil by the BFP. To do so, 72 Cannabis samples seized in Brazil by BFP were analyzed. The principal coordinate analysis (PCoA) and probability identity (PI) analysis were computed. Additionally, the Cannabis samples’ genotypes were subjected to comparison by Kruskal-Wallis H, followed by a multiple discriminant analysis (MDA). All samples analyzed revealed a distinct genetic profile. PCoA clearly discriminated the seizure sets based on their geographic origin. A combination of seven loci was enough to differentiate samples’ genotypes, and the PI for a random sample is approximately one in 50 billion. The Cannabis samples were 100% correct as classified by Kruskal-Wallis H, followed by an MDA. The results of this study demonstrate that the 13-loci STR multiplex system successfully achieved the aim of sample individualization and origin differentiation and suggest that it could be a useful tool to help BFP intelligence in tracing back-trade routes.

Keywords

Cannabis sativa L. Genotype Short tandem repeat Marker 

Notes

Acknowledgments

We would like to thank Dr. David Gangitano and Dr. Rachel Houston for provide the panel, the bins, the allelic ladder, and two Cannabis-positive control samples. We also want to thank Dr. Claudia Paiva Nunes, Lucas Ribeiro, and Pietra Graebin for their technical assistance.

Funding information

This work was supported by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) of Brazil (grant PRO-FORENSE 25/2014) and National Institute of Forensic Science and Technology (CNPq/INCT Forense grant 465450/2014-8).

Compliance with ethical standards

Disclaimer

The funders had no role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Mauro Sander Fett
    • 1
    • 2
  • Roberta Fogliatto Mariot
    • 1
    Email author
  • Eduardo Avila
    • 2
    • 3
  • Clarice Sampaio Alho
    • 3
  • Valdir Marcos Stefenon
    • 4
  • Flávio Anastácio de Oliveira Camargo
    • 1
  1. 1.Soil Science Department, Agronomy FacultyFederal University of Rio Grande do Sul (UFRGS)Porto AlegreBrazil
  2. 2.Setor Técnico-Científico, Superintendência Regional do Departamento de Polícia Federal no Rio Grande do SulPorto AlegreBrazil
  3. 3.Bioscience FacultyPontifícia Universidade Católica do Rio Grande do Sul (PUCRS)Porto AlegreBrazil
  4. 4.Interdisciplinary Center of Biotechnology ResearchFederal University of the Pampa (UNIPAMPA)São GabrielBrazil

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