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Noël J, Noël S, Mailly F, Granger D, Lefebvre JF, Milot E, Séguin D. Total allele count distribution (TAC curves) improves number of contributor estimation for complex DNA mixtures. CANADIAN SOCIETY OF FORENSIC SCIENCE JOURNAL 2022. [DOI: 10.1080/00085030.2022.2028359] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Josée Noël
- Laboratoire de Sciences Judiciaires et de Médecine Légale, Montréal, Québec, Canada
| | - Sarah Noël
- Laboratoire de Sciences Judiciaires et de Médecine Légale, Montréal, Québec, Canada
| | - France Mailly
- Laboratoire de Sciences Judiciaires et de Médecine Légale, Montréal, Québec, Canada
| | - Dominic Granger
- Laboratoire de Sciences Judiciaires et de Médecine Légale, Montréal, Québec, Canada
| | | | - Emmanuel Milot
- Laboratoire de Recherche en Criminalistique, Department of Chemistry, Biochemistry and Physics and Centre International de Criminologie Comparée, Université du Québec à Trois-Rivières, Trois-Rivières, Québec, Canada
| | - Diane Séguin
- Laboratoire de Sciences Judiciaires et de Médecine Légale, Montréal, Québec, Canada
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Roewer L, Andersen MM, Ballantyne J, Butler JM, Caliebe A, Corach D, D'Amato ME, Gusmão L, Hou Y, de Knijff P, Parson W, Prinz M, Schneider PM, Taylor D, Vennemann M, Willuweit S. DNA commission of the International Society of Forensic Genetics (ISFG): Recommendations on the interpretation of Y-STR results in forensic analysis. Forensic Sci Int Genet 2020; 48:102308. [PMID: 32622324 DOI: 10.1016/j.fsigen.2020.102308] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Accepted: 05/06/2020] [Indexed: 10/24/2022]
Abstract
Forensic genetic laboratories perform a large amount of STR analyses of the Y chromosome, in particular to analyze the male part of complex DNA mixtures. However, the statistical interpretation of evidence retrieved from Y-STR haplotypes is challenging. Due to the uni-parental inheritance mode, Y-STR loci are connected to each other and thus haplotypes show patterns of relationship on the familial and population level. This precludes the treatment of Y-STR loci as independently inherited variables and the application of the product rule. Instead, the dependency structure of Y-STRs needs to be included in the haplotype frequency estimation process affecting also the current paradigm of a random match probability that is in the autosomal case approximated by the population frequency assuming unrelatedness of sampled individuals. Information on the degree of paternal relatedness in the suspect population as well as on the familial network is however needed to interpret Y-chromosomal results in the best possible way. The previous recommendations of the DNA commission of the ISFG on the use of Y-STRs in forensic analysis published more than a decade ago [1] cover the interpretation issue only marginally. The current recommendations address a number of topics (frequency estimators, databases, metapopulations, LR formulation, triage, rapidly mutating Y-STRs) with relevance for the Y-STR statistics and recommend a decision-based procedure, which takes into account legal requirements as well as availability of population data and statistical methods.
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Affiliation(s)
- Lutz Roewer
- Institute of Legal Medicine and Forensic Sciences, Dept. Forensic Genetics, Charité - Universitätsmedizin Berlin, Germany.
| | - Mikkel Meyer Andersen
- Department of Mathematical Sciences, Aalborg University, Aalborg, Denmark; Section of Forensic Genetics, Department of Forensic Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Denmark
| | - Jack Ballantyne
- National Center for Forensic Science, University of Central Florida, Orlando, USA
| | - John M Butler
- National Institute of Standards and Technology, Special Programs Office, Gaithersburg, USA
| | - Amke Caliebe
- Institute of Medical Informatics and Statistics, Kiel University, University Hospital Schleswig-Holstein, Kiel, Germany
| | - Daniel Corach
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Microbiología, Immunología, Biotecnología y Genética, Cátedra de Genética Forense y Servicio de Huellas Digitales Genéticas, Buenos Aires, Argentina; National Research Council, CONICET, Buenos Aires, Argentina
| | - Maria Eugenia D'Amato
- University of the Western Cape, Department of Biotechnology, Forensic DNA Lab, Cape Town, South Africa
| | - Leonor Gusmão
- State University of Rio de Janeiro (UERJ), Rio de Janeiro, Brazil; IPATIMUP, Institute of Molecular Pathology and Immunology of the University of Porto, Portugal; Instituto de Investigação e Inovação em Saúde, University of Porto, Portugal
| | - Yiping Hou
- Institute of Forensic Medicine, West China School of Basic Science & Forensic Medicine, Sichuan University, Chengdu, China
| | - Peter de Knijff
- Department of Human Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - Walther Parson
- Institute of Legal Medicine, Medical University of Innsbruck, Innsbruck, Austria; Forensic Science Program, The Pennsylvania State University, University Park, PA, USA
| | - Mechthild Prinz
- John Jay College of Criminal Justice, Dept. of Sciences, New York, USA
| | - Peter M Schneider
- Institute of Legal Medicine, Medical Faculty, University of Cologne, Cologne, Germany
| | - Duncan Taylor
- Forensic Science South Australia, Adelaide, Australia; Flinders University, Adelaide, Australia
| | | | - Sascha Willuweit
- Institute of Legal Medicine and Forensic Sciences, Dept. Forensic Genetics, Charité - Universitätsmedizin Berlin, Germany
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