https://repository.kopri.re.kr/handle/201206/14805 2026-04-07T04:40:53Z 2026-04-07T04:40:53Z Thi-Phuong Nguyen 이승연 Jeong, Jihye 김지훈 한동원 Kim, Il-Chan Lee, Jun Hyuck Park, Jisoo Kim, Jin-Hyoung https://repository.kopri.re.kr/handle/201206/14856 2023-12-06T16:37:45Z 2023-01-01T00:00:00Z

Title: Complete mitochondrial genome of Trematomus newnesi (Perciformes, Nototheniidae) Authors: Thi-Phuong Nguyen; 이승연; Jeong, Jihye; 김지훈; 한동원; Kim, Il-Chan; Lee, Jun Hyuck; Park, Jisoo; Kim, Jin-Hyoung Abstract: The complete mitochondrial genome ofTrematomus newnesiwas sequenced using an Illumina plat-form. The 18,602bp mitogenome contains 13 protein-coding genes, two rRNAs, and 23 tRNAs (tRNAMetis duplicated). The eight stop codons are TAA, TAG, CTT, GTA, AAT, ACT, AGG, and TTA. Two startcodons ATG and GTG are present. The GC content is 44.4% and AT content is 55.6%. A phylogenetictree was generated using 13 species from three families. The results showed thatT. newnesiis closelyrelated toPagothenia borchgrevinkiin Nototheniidae. This study provides fundamental data for furthergenetic evolutionary studies onT. newnesi.

2023-01-01T00:00:00Z 김지훈 이승연 Thi-Phuong Nguyen 한동원 Kim, Il-Chan Kim, Jin-Hyoung https://repository.kopri.re.kr/handle/201206/14894 2023-12-06T16:38:20Z 2023-01-01T00:00:00Z

Title: Length-weight relationships and Condition factors of six Notothenioidei fishes caught in King George Island and Northern Victoria Land in Antarctica Authors: 김지훈; 이승연; Thi-Phuong Nguyen; 한동원; Kim, Il-Chan; Kim, Jin-Hyoung Abstract: This research was conducted to study length-weight relationships (LWR) and condition factors of six Antarctic notothenioidei fsh species including blackfn icefsh (Chaenocephalus aceratus), single-angle icefsh (Chionodraco hamatus), marbled rockcod (Notothenia rossii), black rockcod (Notothenia coriiceps), emerald rockcod (Trematomus bernacchii), and dusky rockcod (Trematomus newnesi) from the King Sejong Station on King George Island and Jang Bogo Station on the Northern Victoria Land. A total of 232 specimens were collected by fshing on the icebreaking research vessel ARAON from December 2020 to February 2021. The LWR parameters and condition factors difered depending on species, which can be afected by their distribution, species characteristics, and gravidity status. The exponent b values in LWR (W=aLb) ranged from 2.593 to 5.184. Four species including C. aceratus, C. hamatus, N. rossii, and T. bernacchii followed positive allometric growth, T. newnesi followed negative allometric growth, and only N. coriiceps showed isometric growth. These results can be helpful in understanding the ecological and growth conditions of six fsh species living in the Antarctic Ocean, providing more information for future research on Antarctic fsh.

2023-01-01T00:00:00Z Reed Katherine A. Williamson R. Thomas Lee, Sung Gu Lee, Jun Hyuck Covi Joseph A. https://repository.kopri.re.kr/handle/201206/14954 2023-12-06T16:39:11Z 2023-01-01T00:00:00Z

Title: Reversible intracellular acidification and depletion of NTPs provide a potential physiological origin for centuries of dormancy in an Antarctic freshwater copepod Authors: Reed Katherine A.; Williamson R. Thomas; Lee, Sung Gu; Lee, Jun Hyuck; Covi Joseph A. Abstract: A great diversity of crustacean zooplankton found in inland and coastal waters produce embryos that settle into bottom sediments to form an egg bank. Embryos from these banks can remain dormant for centuries, creating a reservoir of genetic diversity. A large body of literature describes the ecological and evolutionary importance of zooplankton egg banks. However, literature on the physiological traits behind dormancy in crustacean zooplankton are limited. Most data on the physiology of dormancy comes from research on one species of anostracan, the brine shrimp, Artemia franciscana. Anoxia-induced dormancy in this species is facilitated by a profound and reversible acidification of the intracellular space. This acidification is accompanied by a reversible depletion of adenosine triphosphate (ATP). The present study demonstrates that acidification of the intracellular space also occurs in concert with a depletion of nucleoside triphosphates (NTPs) in the Antarctic copepod, Boeckella poppei. Like A. franciscana, the depletion of NTPs and acidification are rapidly reversed during aerobic recovery in B. poppei. These data provide the first comparative evidence that extreme dormancy under anoxia in crustacean zooplankton is associated with intracellular acidification and an ability to recover from the depletion of ATP.

2023-01-01T00:00:00Z Kang, Pilsung Yoo, Yo-Han Kim Dong-Il Yim, Joung Han Lee, Hyoungseok https://repository.kopri.re.kr/handle/201206/14854 2023-12-06T16:37:43Z 2023-01-01T00:00:00Z

Title: De Novo Transcriptome Assembly and Comparative Analysis of Differentially Expressed Genes Involved in Cold Acclimation and Freezing Tolerance of the Arctic Moss Aulacomnium turgidum (Wahlenb.) Schwaegr Authors: Kang, Pilsung; Yoo, Yo-Han; Kim Dong-Il; Yim, Joung Han; Lee, Hyoungseok Abstract: Cold acclimation refers to a phenomenon in which plants become more tolerant to freezing after exposure to non-lethal low temperatures. Aulacomnium turgidum (Wahlenb.) Schwaegr is a moss found in the Arctic that can be used to study the freezing tolerance of bryophytes. To improve our understanding of the cold acclimation effect on the freezing tolerance of A. turgidum, we compared the electrolyte leakage of protonema grown at 25 degrees C (non-acclimation; NA) and at 4 degrees C (cold acclimation; CA). Freezing damage was significantly lower in CA plants frozen at -12 degrees C (CA-12) than in NA plants frozen at -12 degrees C (NA-12). During recovery at 25 degrees C, CA-12 demonstrated a more rapid and greater level of the maximum photochemical efficiency of photosystem II than NA-12, indicating a greater recovery capacity for CA-12 compared to NA-12. For the comparative analysis of the transcriptome between NA-12 and CA-12, six cDNA libraries were constructed in triplicate, and RNA-seq reads were assembled into 45,796 unigenes. The differential gene expression analysis showed that a significant number of AP2 transcription factor genes and pentatricopeptide repeat protein-coding genes related to abiotic stress and the sugar metabolism pathway were upregulated in CA-12. Furthermore, starch and maltose concentrations increased in CA-12, suggesting that cold acclimation increases freezing tolerance and protects photosynthetic efficiency through the accumulation of starch and maltose in A. turgidum. A de novo assembled transcriptome can be used to explore genetic sources in non-model organisms.

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