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Potential use of high-throughput sequencing of bacterial communities for postmortem submersion interval estimation

Abstract

Microorganisms play vital roles in the natural decomposition of carcasses in aquatic systems. Using high-throughput sequencing techniques, we evaluated the composition and succession of microbial communities throughout the decomposition of rat carcasses in freshwater. A total of 4,428,781 high-quality 16S rRNA gene sequences and 2144 operational taxonomic units were obtained. Further analysis revealed that the microbial composition differed significantly between the epinecrotic (rat skins) and the epilithic (rocks) samples. During the carcass decomposition process, Proteobacteria became the dominant phylum in the epinecrotic, epilithic, and environmental (water) samples, followed by Firmicutes in the epinecrotic samples and Bacteroidetes in the epilithic and water samples. Microbial communities were influenced by numerous environmental factors, such as dissolved oxygen content and conductivity. Our study provides new insight about postmortem submersion interval (PMSI) estimation in aquatic environments.

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Acknowledgments

The authors are grateful for the technical support provided by the Majorbio Medical Technology Co., LTD. (Shanghai, China).

Funding

This work was funded by the National Natural Science Foundation of China (81571855).

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Correspondence to Jifeng Cai.

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The study and all protocols were approved by the Medical Ethics Committee of Xiangya Hospital, Central South University (approval No: 201503465).

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He, J., Guo, J., Fu, X. et al. Potential use of high-throughput sequencing of bacterial communities for postmortem submersion interval estimation. Braz J Microbiol 50, 999–1010 (2019). https://doi.org/10.1007/s42770-019-00119-w

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  • DOI: https://doi.org/10.1007/s42770-019-00119-w

Keywords

  • PMSI
  • Epinecrotic
  • Epilithic
  • Forensic
  • Microorganism