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Paternal and maternal mutations in X-STRs: A GHEP-ISFG collaborative study


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The GHEP-ISFG organized a collaborative study to estimate mutation rates for the markers included in the Investigator Argus X-12 QS kit Qiagen. A total of 16 laboratories gathered data from 1,612 father/mother/daughter trios, which were used to estimate both maternal and paternal mutation rates, when pooled together with other already published data. Data on fathers and mothers’ age at the time of birth of the daughter were also available for ∼93 % of the cases. Population analyses were computed considering the genetic information of a subset of 1,327 unrelated daughters, corresponding to 2,654 haplotypes from residents in several regions of five countries: Argentina, Brazil, Ecuador, Portugal and Spain. Genetic differentiation analyses between the population samples from the same country did not reveal signs of significant stratification, although results from Hardy-Weinberg and linkage disequilibrium tests indicated the need of larger studies for Ecuador and Brazilian populations. The high genetic diversity of the markers resulted in a large number of haplotype combinations, showing the need of huge databases for reliable estimates of their frequencies. It should also be noted the high number of new alleles found, many of them not included in the allelic ladders provided with the kit, as very diverse populations were analyzed. The overall estimates for locus specific average mutation rates varied between 7.5E-04 (for DXS7423) and 1.1E-02 (for DXS10135), the latter being a troublesome figure for kinship analyses. Most of the found mutations (∼92 %) are compatible with the gain or loss of a single repeat. Paternal mutation rates showed to be 5.2 times higher than maternal ones. We also found that older fathers were more prone to transmit mutated alleles, having this trend not been observed in the case of the mothers.

Institute of Pathology and Molecular Immunology from University of Porto (IPATIMUP)

Instituto de Investigação e Inovação em Saúde I3S Universidade do Porto

CMUP Centro de Matemática da Universidade do Porto

Section of Forensic Genetics Department of Forensic Medicine Faculty of Health and Medical Sciences University of Copenhagen

Laboratório de Diagnóstico por DNA (LDD) Universidade do Estado do Rio de Janeiro

Centro de Genética Forense Poder Judicial de Córdoba

Laboratorio Regional de Investigación Forense Tribunal Superior de Justicia de Santa Cruz

UNESP-Universidade Estadual Paulista Faculdade de Ciências Farmacêuticas Laboratório de Investigação de Paternidade-NAC

Instituto Nacional de Medicina Legal e Ciências Forenses I.P. Serviço de Genética e Biologia Forenses Delegação do Centro

Escuela de Medicina Facultad de Ciencias de la Salud Universidad de Las Américas (UDLA)

Laboratorio de ADN de la Fiscalía General del Estado

Departamento de Biología Servicio de Criminalística de la Guardia Civil

Laboratorio Regional de Genética Forense Poder Judicial de Río Negro

Instituto Nacional de Medicina Legal e Ciências Forenses I.P. Serviço de Genética e Biologia Forenses Delegação do Norte

PRICAI-Fundación Favaloro

Laboratorio de Análisis de ADN Facultad de Ciencias Médicas Universidad Nacional de Cuyo

LabGenetics: Laboratorio de Genética Clínica S.L.

Genomic Engenharia Molecular Molecular

Laboratorio de Genética Forense Poder Judicial de la Provincia de La Pampa

Laboratorio MANLAB Área de Filiaciones

UNESP-Universidade Estadual Paulista Faculdade de Ciências Farmacêuticas Laboratório de Investigação de Paternidade-NAC

Document Type Journal article
Language English
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