• Title/Summary/Keyword: environmental DNA

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Application of Environmental DNA for Monitoring of Freshwater Fish in Korea (환경유전자의 국내 담수어류 모니터링 적용 연구)

  • Kim, Jeong-Hui;Jo, Hyunbin;Chang, Min-Ho;Woo, Seung-Hyun;Cho, Youngho;Yoon, Ju-Duk
    • Korean Journal of Ecology and Environment
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    • v.53 no.1
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    • pp.63-72
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    • 2020

  • In this study, to discuss on the applicability of eDNA as a new method to investigate fish diversity at streams, we applied eDNA at 4 streams (Geum River, Ji Stream, Hwangji Stream, Seomjin River), where endangered species are inhabits, with conventional survey (cast net and kick net). The average (±standard deviation) number of species investigated by eDNA were 19 species (±4.4), and it was relatively higher than average of conventional survey, 10 species (±4.8). Most of case, in this study, eDNA was more efficient than conventional survey. However, there were errors on species identification of Korean endemic species and aliied species from eDNA, and it seems the universal primer (MiFish primer set) is not suitable for them. Furthermore, some of endangered species, caught by conventional method, was not detected by eDNA. As the present universal primer is not suitable for identify the every freshwater fish species in Korea, the complementing or development of universal primer is needed, and the eDNA application after species specific marker development for detecting specific species like endangered species should be considered. In conclusion, if the manual for field survey method by eDNA is developed, we expect applicability enlargement for water ecosystem survey.

  • https://doi.org/10.11614/KSL.2020.53.1.063 인용 PDF KSCI

Efficiency Comparison of Environmental DNA Metabarcoding of Freshwater Fishes according to Filters, Extraction Kits, Primer Sets and PCR Methods (분석조건별 담수어류의 환경 DNA 메타바코딩 효율 비교: 필터, 추출 키트, 프라이머 조합 및 PCR 방법)

  • Kim, Keun-Sik;Kim, Keun-Yong;Yoon, Ju-Duk
    • Korean Journal of Ecology and Environment
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    • v.54 no.3
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    • pp.199-208
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    • 2021

  • Environmental DNA (eDNA) metabarcoding is effective method with high detection sensitivity for evaluating fish biodiversity and detecting endangered fish from natural water samples. We compared the richness of operational taxonomic units(OTUs) and composition of freshwater fishes according to filters(cellulose nitrate filter vs. glass fiber filter), extraction kits(DNeasy2® Blood & Tissue Kit vs. DNeasy2® PowerWater Kit), primer sets (12S rDNA vs. 16S rDNA), and PCR methods (conventional PCR vs. touchdown PCR) to determine the optimal conditions for metabarcoding analysis of Korean freshwater fish. The glass fiber filter and DNeasy2® Blood & Tissue Kit combination showed the highest number of freshwater fish OTUs in both 12S and 16S rDNA. Among the four types, the primer sets only showed statistically significant difference in the average number of OTUs in class Actinopterygii (non-parametric Wilcoxon signed ranks test, p=0.005). However, there was no difference in the average number of OTUs in freshwater fish. The species composition also showed significant difference according to primer sets (PERMANOVA, Pseudo-F=6.9489, p=0.006), but no differences were observed in the other three types. The non-metric multidimensional scaling (NMDS) results revealed that species composition clustered together according to primer sets based on similarity of 65%; 16S rDNA primer set was mainly attributed to endangered species such as Microphysogobio koreensis and Pseudogobio brevicorpus. In contrast, the 12S rDNA primer set was mainly attributed to common species such as Zacco platypus and Coreoperca herzi. This study provides essential information on species diversity analysis using metabarcoding for environmental water samples obtained from rivers in Korea.

  • https://doi.org/10.11614/KSL.2021.54.3.199 인용 PDF KSCI

Optimization of DNA Extraction and PCR Conditions for Fungal Metagenome Analysis of Atmospheric Particulate Matter (대기 입자상물질 시료의 곰팡이 메타게놈 분석을 위한 DNA 추출 및 PCR 조건 최적화)

  • Sookyung Kang;Kyung-Suk Cho
    • Microbiology and Biotechnology Letters
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    • v.51 no.1
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    • pp.99-108
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    • 2023

  • Several challenges arise in DNA extraction and gene amplification for airborne fungal metagenome analysis from a particulate matter (PM) samples. In this study, various conditions were tested to optimize the DNA extraction method from PM samples and polymerase chain reaction (PCR) conditions with primer set and annealing temperature. As a result of comparative evaluation of DNA extraction under various conditions, chemical cell lysis using buffer and proteinase K for 20 minutes and bead beating treatment were followed by using a commercial DNA extraction kit to efficiently extract DNA from the PM filter samples. To optimize the PCR conditions, PCR was performed using 10 primer sets for amplifying the ITS2 gene region. The concentration of the PCR amplicon was relatively high when the annealing temperature was 58℃ with the ITS3tagmix3/ITS4 primer set. Even under these conditions, when the concentration of the PCR product was low, nested PCR was performed using the primary PCR amplicon as the template DNA to amplify the ITS2 gene at a satisfactory concentration. Using the methods optimized in this study, DNA extraction and PCR were performed on 15 filter samples that collected PM2.5 in Seoul, and the ITS2 gene was successfully amplified in all samples. The optimized methods can be used for research on analyzing and interpreting the fungal metagenome of atmospheric PM samples.

  • https://doi.org/10.48022/mbl.2212.12010 인용 PDF