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A novel method of male sex identification of human ancient skeletal remains

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Abstract

Sex identification of ancient individuals is important to understand aspects of the culture, demographic structure, religious practices, disease association, and the history of the ancient civilizations. Sex identification is performed using anthropometric measurements and molecular genetics techniques, including quantification of the X and Y chromosomes. These approaches are not always reliable in subadult, or fragmented, incomplete skeletons or when the DNA is highly degraded. Most of the methods include the identification of the male and female sexes, but the absence of a specific marker for the males does not mean that the sample obtained was from a female. This study aims (1) to identify new male-specific regions that allow male identification; (2) to contrast the effectiveness of these markers against AMELX/AMELY and anthropometric measurement procedures; and (3) to test the efficacy of these markers in archaeological samples. For the first two aims, we used known sex samples, and for the third aim, we used samples from different archaeological sites. A novel molecular technique to identify male-specific regions by amplification of TTTY7, TSPY3, TTTY2, and TTTY22 genes of the human Y chromosome was developed. The results showed amplification of the specific DNA regions of Y chromosome in male individuals, with no amplification being observed in any of the female samples, confirming their specificity for male individuals. This approach complements the current procedures, such as the AMELX/AMELY test and anthropometric principle.

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Data availability

All data generated or analysed during this study are included in this published article.

Abbreviations

Chr-X:

X chromosome

Chr-Y:

Y chromosome

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Acknowledgements

We thank the Architect Engineer Verónica Alejandra Roman-Navarro for the advice provided to develop Figs. 1 and 3. In addition, we specially acknowledge the Puxcatan, Abrigo Rocoso Fidencio López, and Sima Cuesta Chica native communities (Tacotalpa, Tabasco) for their collaboration in this project. We sincerely thank reviewers for their careful reading of our manuscript and their many insightful comments and suggestions.

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Not applicable.

Funding

We thank Consejo Nacional de Ciencia y Tecnología (CONACYT) for the financial support of the scholarship awards to M.T.N.-R (Becas Nacionales 2014_Primer Periodo-380118 and Becas Mixtas_2015-Marzo 2016-290936) and E.D.-de-la-C. (CVU 485179, CB 2015/258103, and AYTE. 177559; and COMECYT 18BTD0020). We also thank the FIS IMSS for financial support (FIS/IMSS/PROT/PRIO/17/063, 2017-785-071) and the research scholarship of IMSS Foundation A. C. given to Dr. Normand García Hernández.

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Authors and Affiliations

Authors

Contributions

MTN-R and M-d-LM conceived and designed the research; MTN_R performed the research; EA- and ET-E contributed with the data of the ancient bones; ED-de-la-Cruz and MAM-G performed amplification experiments; NG-H obtained the contemporary DNA and contributed with data analysis; MTN-R and M-d-LM wrote the paper; all authors read and approved the manuscript.

Corresponding author

Correspondence to María de Lourdes Muñoz.

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Conflict of interest

The authors declare that they have no competing interests.

Ethics approval

The samples were registered to project number 2017-785-071, and the National Ethics Commission (IMSS) ethics committee approved the study.

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The participants provided their written consent to participate.

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The participants provided their written consent for publication.

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Responsible Editor: Irina Solovei

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Navarro-Romero, M.T., Muñoz, M.d.L., Alcala-Castañeda, E. et al. A novel method of male sex identification of human ancient skeletal remains. Chromosome Res 28, 277–291 (2020). https://doi.org/10.1007/s10577-020-09634-1

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  • DOI: https://doi.org/10.1007/s10577-020-09634-1

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