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Yum. Seungshic,Suh, Ji-Yoeun,Woo, Seonock,Jeon, Hyung-Wook,Kim, Keun Chong,Suh, Dong Sang 한국유전학회 2004 Genes & Genomics Vol.26 No.3
This study analyzed the D-loop region of 28 Korean cattle (Bos taurus) from 7 different localities to examine the genetic diversity of Korean cattle populations. Approximately 1.6 kb of D-loop region sequences was determined and nucleotide variations were compared using the sequences of the 28 Korean cattle and the published sequences of 18 Japanese, 10 European, 6 African and 6 Indian cattle. Dendrograms indicated that the Korean cattle were more closely related to the European than Japanese cattle. The Indian cattle showed the furthest genetic relation to the Korean cattle. This paper discussed the genetic relationship of Korean domestic cattle compared with European, African, Indian and Japanese cattle based on the sequence variations of the mitochondria) DNA D-loop region.
우선옥,Seungshic Yum,윤문근,Sa Heung Kim,Jongrak Lee,Jeong Ha Kim,Taek-Kyun Lee 한국통합생물학회 2005 Animal cells and systems Vol.9 No.4
A rapid, simple and efficient method to extract RNA from the adult polyps of a soft coral, marine cnidarian, Scleronephthya gracillimum (Kkenthal), was developed in this study. The highest yield and purity of RNA was obtained with the lysis solution containing 35 mM EDTA, 0.7 M LiCl, 7.0% SDS, and 200 mM Tris-Cl (pH 9.0). Approximately 40 g of total RNA was extracted from 200 mg of liquid nitrogen-pulverized polyp tissue. The ratio of absorbance at 260 nm and 280 nm ranged from 1.8 to 2.0. The results of the reverse transcription polymerase chain reaction (RT-PCR) with -actin gene specific primers and Northern blot analysis using the same gene probe revealed that the RNA extracted by our method had high quality, and was sufficient for subsequent molecular biological analyses. This method was effective for RNA extraction from other soft coral species which belong to the genus Dendronephthya.
Woo, Seonock,Won, Hyokyoung,Lee, Aekyung,Yum, Seungshic 대한독성유전단백체학회 2012 Molecular & cellular toxicology Vol.10 No.2
Transcriptional changes in the expression of stress-related genes (catalase, glutathione peroxidase, glutathione S-transferase, glutathione reductase, metallothionein, and ubiquitin) in intestinal, liver and muscle tissues of Javanese medaka (Oryzias javanicus) exposed to $17{\beta}$-estradiol (E2) were investigated using real-time quantitative PCR. The lipid peroxidation levels and superoxide dismutase activity in liver tissues was also examined at various exposure concentrations. In fish exposed to 10, 100 and 1000 ${\mu}g/L$ E2 the level of catalase mRNA increased significantly in intestinal and muscle tissues, while expression of the glutathione peroxidase gene showed the opposite trend in liver and muscle tissues. Expression of the glutathione S-transferase gene increased in a dose-dependent manner in liver and muscle tissues of fish exposed to E2, relative to the non-exposed control group. The level of glutathione reductase mRNA increased markedly in the liver tissues of all fish exposed to 100 and 1000 ${\mu}g/L$ E2, but decreased in intestinal tissues. The metallothionein gene was strongly downregulated in intestinal and liver tissues of fish exposed to E2, but slightly upregulated in muscle tissues. In all fish exposed to 100 and 1000 ${\mu}g/L$ E2 expression of the ubiquitin gene increased markedly in liver and muscle tissue, but not in intestinal tissues. Lipid peroxidation and superoxide dismutase activities increased significantly in all $17{\beta}$-estradiol treatment groups, and were correlated to the exposure concentration. Thus, E2 exposure differentially affected the transcription of a range of stress-related genes in various tissues of Javanese medaka, suggesting that analysis of transcriptional changes in these genes could be used as a rapid assay of the effects of E2 exposure.
Impact of zinc oxide nanoparticles on the bacterial community of Hydra magnipapillata
Ade Yamindago,Nayun Lee,Seonock Woo,Seungshic Yum 대한독성 유전단백체 학회 2020 Molecular & cellular toxicology Vol.16 No.1
Backgrounds Zinc oxide nanoparticles (ZnO NPs) are extensively used for various products. In this study, the effects of ZnO NPs exposure in diversity and community composition of the bacteria associated with H. magnipapillata were investigated. This study provides insight into possible impacts of ZnO NPs on aquatic organisms. Methods 454-pyrosequencing analysis of the bacterial 16S rRNA gene was applied to H. magnipapillata after exposure to 10 mg/L ZnO NPs (Ø 20 nm). Results Acute exposure to ZnO NPs changed the diversity and compositions of the associated bacteria. The composition of Curvibacter decreased, but Flectobacillus and Delftia increased; these two genera are known to have beneficial functions. Conclusion The changes in diversity and composition of the associated bacteria may indicate the possible mechanisms by which the associated bacteria maintain their mutual interactions and support the health of their host after exposure to ZnO NPs.