Journal of Microbiology

Journal Article

Preliminary study on microeukaryotic community analysis using NGS technology to determine postmortem submersion interval (PMSI) in the drowned pig: Cheol-ho Hyun , Heesoo Kim , Seongho Ryu , Won Kim; J. Microbiol. 2019;57(11):1003-1011. Published online September 25, 2019; DOI: https://doi.org/10.1007/s12275-019-9198-0

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While several methods for determining postmortem submersion interval (PMSI) in drowning cases have been suggested, the estimation of PMSI remains difficult. Next-generation sequencing (NGS) technology enables simultaneous identification of multiple taxa from environmental samples. Although NGS has been applied to estimate time since death, this application has been mainly focused on terrestrial cases. As a case study, we investigated microeukaryotic biodiversity and community structures in submerged car bonnet and drowned pig using NGS technology. NGS analysis showed that the microeukaryotic biodiversity in pig carcass was relevantly lower than that in car bonnet. NGS results also revealed that water molds and algae were related to decomposition. Relative abundances of Filobasidium, Achlya, Saprolegnia, Hydrodicton, Lobosphaera, and Scenedesmus varied with decomposition period. This data indicated that these taxa might be useful as good indicators to estimate PMSI. This study showed microeukaryotic community analysis using NGS technology may help solve drowning cases in forensic investigation.

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Research Support, Non-U.S. Gov't

Microeukaryotic Diversity in Marine Environments, an Analysis of Surface Layer Sediments from the East Sea: Soo-Je Park , Byoung-Joon Park , Vinh Hoa Pham , Dae-No Yoon , Si-Kwan Kim , Sung-Keun Rhee; J. Microbiol. 2008;46(3):244-249. Published online July 5, 2008; DOI: https://doi.org/10.1007/s12275-007-0237-x

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Abstract: Molecular techniques, based on clone library of 18S rRNA gene, were employed to ascertain the diversity of microeukaryotic organisms in sediments from the East Sea. A total of 261 clones were recovered from surface sediments. Most of the clone sequences (90%) were affiliated with protists, dominated by Ciliates (18%) and Dinoflagellates (19%) of Alveolates, phototrophic Stramenopiles (11%), and Cercozoa (20%). Many of the clones were related to uncultivated eukaryotes clones retrieved from anoxic environments with several highly divergent 18S rRNA gene sequences. However, no clones were related to cultivated obligate anaerobic protists. Protistan communities between subsurface layers of 1 and 9 cm shared 23% of total phylotypes which comprised 64% of total clones retrieved. Analysis of diversity indices and rarefaction curve showed that the protistan community within the 1 cm layer exhibited higher diversity than the 9 cm layer. Our results imply that diverse protists remain to be uncovered within marine benthic environments.

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