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Dive into the research topics where Han-Gu Choi is active.

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Featured researches published by Han-Gu Choi.


Zoologica Scripta | 2012

The mitochondrial genomes of Cambaroides similis and Procambarus clarkii (Decapoda: Astacidea: Cambaridae): the phylogenetic implications for Reptantia

Sanghee Kim; Mi-Hyun Park; Jae-Ho Jung; Dong-Ha Ahn; Tahera Sultana; Se-Joo Kim; Joong-Ki Park; Han-Gu Choi; Gi-Sik Min

Kim, S., Park, M.‐H., Jung, J.‐H., Ahn, D.‐H., Sultana, T., Kim, S., Park, J.‐K., Choi, H.‐G. & Min, G.‐S. (2012). The mitochondrial genomes of Cambaroides similis and Procambarus clarkii (Decapoda: Astacidea: Cambaridae): the phylogenetic implications for Reptantia. —Zoologica Scripta, 41, 281–292.


Acta Protozoologica | 2011

A New Marine Ciliate, Metaurostylopsis antarctica nov. spec. (Ciliophora, Urostylida) from the Antarctic Ocean

Jae-Ho Jung; Ye-Seul Baek; Sanghee Kim; Han-Gu Choi; Gi-Sik Min

In this study, a new marine urostylid ciliate, Metaurostylopsis antarctica nov. spec. collected from the Antarctic Ocean was investigated using morphological, morphometrical, and molecular methods. Metaurostylopsis antarctica nov. spec. is characterized as follows: slender to ellipsoid form in body shape; two types of cortical granules, ellipsoid large one (type I, yellow-green, 1.5 × 1 μm) in rows along dorsal kineties and cirri, circular small one (type II, colourless, 0.3 μm in diameter) scattered throughout whole body; 19-24 adoral membranelles, 4 frontal cirri, 2-5 frontoterminal cirri, 1 buccal and 2 transverse cirri; 3-5 midventral pairs, 10-15 cirri of midventral row; 1 right and 2 left marginal rows; 3 dorsal kineties; about 43 macronuclear nodules. This new species mainly differs from the congeners by the number of marginal rows (1 vs. 3 or more on right side; 2 vs. 3 or more on left side). In addition, proters oral primordium developed on the right side of the oral cavity (vs. in center of oral cavity), and the rightmost anlage splits into two parts, namely, the frontoterminal cirri and a transverse cirrus (vs. only frontoterminal cirri). Inter-specific dissimilarities of the SSU rRNA gene between the congeners range from 3.3 to 4.4%.


Mitochondrial DNA | 2011

The complete mitochondrial genome of the American lobster, Homarus americanus (Crustacea, Decapoda)

Sanghee Kim; Sang-Hwa Lee; Mi-Hyun Park; Han-Gu Choi; Joong-Ki Park; Gi-Sik Min

Although relatively a large number of the complete mitochondrial genome sequences have been determined from various decapod species (29 mtDNA sequences reported so far), the information for the infraorder Astacidea (including lobsters, crayfishes, and their relatives) is very limited and represented by only one complete sequence from the Australian freshwater crayfish species Cherax destructor. In this study, we determined the complete mitochondrial DNA sequence of Homarus americanus, the first representative of the family Nephropidae to be fully characterized. Comparison of the gene arrangement reveals that H. americanus mtDNA is identical to those of other pancrustacean species but differs from the other astacidean species (C. destructor). Based on these data, it can be assumed that an idiosyncratic gene order discovered in C. destructor mtDNA may be secondarily acquired from the ancestral lineage of the Astacidea.


Viruses | 2014

A Novel Adenovirus in Chinstrap Penguins (Pygoscelis antarctica) in Antarctica

Sook‐Young Lee; Jeong Hoon Kim; Yon Mi Park; Ok Sarah Shin; Hankyeom Kim; Han-Gu Choi; Jin-Won Song

Adenoviruses (family Adenoviridae) infect various organ systems and cause diseases in a wide range of host species. In this study, we examined multiple tissues from Chinstrap penguins (Pygoscelis antarctica), collected in Antarctica during 2009 and 2010, for the presence of novel adenoviruses by PCR. Analysis of a 855-bp region of the hexon gene of a newly identified adenovirus, designated Chinstrap penguin adenovirus 1 (CSPAdV-1), showed nucleotide (amino acid) sequence identity of 71.8% (65.5%) with South Polar skua 1 (SPSAdV-1), 71% (70%) with raptor adenovirus 1 (RAdV-1), 71.4% (67.6%) with turkey adenovirus 3 (TAdV-3) and 61% (61.6%) with frog adenovirus 1 (FrAdV-1). Based on the genetic and phylogenetic analyses, CSPAdV-1 was classified as a member of the genus, Siadenovirus. Virus isolation attempts from kidney homogenates in the MDTC-RP19 (ATCC® CRL-8135™) cell line were unsuccessful. In conclusion, this study provides the first evidence of new adenovirus species in Antarctic penguins.


Gene | 2013

The complete mitochondrial genome of Arctic Calanus hyperboreus (Copepoda, Calanoida) reveals characteristic patterns in calanoid mitochondrial genome.

Sanghee Kim; Byung-Jin Lim; Gi-Sik Min; Han-Gu Choi

Copepoda is the most diverse and abundant group of crustaceans, but its phylogenetic relationships are ambiguous. Mitochondrial (mt) genomes are useful for studying evolutionary history, but only six complete Copepoda mt genomes have been made available and these have extremely rearranged genome structures. This study determined the mt genome of Calanus hyperboreus, making it the first reported Arctic copepod mt genome and the first complete mt genome of a calanoid copepod. The mt genome of C. hyperboreus is 17,910 bp in length and it contains the entire set of 37 mt genes, including 13 protein-coding genes, 2 rRNAs, and 22 tRNAs. It has a very unusual gene structure, including the longest control region reported for a crustacean, a large tRNA gene cluster, and reversed GC skews in 11 out of 13 protein-coding genes (84.6%). Despite the unusual features, comparing this genome to published copepod genomes revealed retained pan-crustacean features, as well as a conserved calanoid-specific pattern. Our data provide a foundation for exploring the calanoid pattern and the mechanisms of mt gene rearrangement in the evolutionary history of the copepod mt genome.


Mitochondrial DNA | 2012

Complete mitochondrial genome of the northern mauxia shrimp Acetes chinensis (Decapoda, Dendrobranchiata, Sergestoidae).

Sanghee Kim; Jiyeon Kim; Han-Gu Choi; Joong-Ki Park; Gi-Sik Min

Here, we report the first complete mitochondrial genome sequence of northern mauxia shrimp Acetes chinensis (Decapoda, Dendrobranchiata, Sergestoidae). The genome sequence was 15,740 bp in size, and the gene content, gene order and transcriptional polarity were almost identical to the pancrustacean ground pattern, with the one exception that an extra trnS1AGC was adjacent to the original trnS1AGA. The two tandemly duplicated trnS1 showed a high sequence similarity (82.3%), with almost identical secondary structure lacking a DHU arm. Comparison of codon usage suggests that both of the trnS1 genes were functional.


Mitochondrial DNA | 2011

The complete mitochondrial genome of the Japanese mud shrimp Upogebia major (Crustacea, Decapoda)

Sanghee Kim; Taeho Kim; Han-Gu Choi; Joong-Ki Park; Dong-Ha Ahn; Gi-Sik Min

We determined a full-length sequence of mitochondrial (mt) genome from Upogebia major. This is the first complete mt genome report for infraorder Thalassinidea in Decapoda, Crustacea. Our result showed that U. major generally followed a typical pancrustacean gene order but some tRNA genes showed a very unique gene arrangement such as duplication or translocation. Since none of the complete mt genome sequences in the infraorder Thalassinidea are available yet, this report will provide additional information in relation to mt genome diversity and evolution of the decapods.


Mitochondrial DNA | 2013

The complete mitochondrial genome of the subarctic red king crab, Paralithodes camtschaticus (Decapoda, Anomura)

Sanghee Kim; Han-Gu Choi; Joong-Ki Park; Gi-Sik Min

We determined the complete mitochondrial (mt) genome sequence of the red king crab, Paralithodes camtschaticus (Decapoda, Anomura). P. camtschaticus is one of the largest arthropods and the most expensive commercially available gourmet seafood. The genome sequence of P. camtschaticus is 16,720 bp in size and its gene content, gene order, and transcriptional polarity are almost identical to those of the hermit crab Pagurus longicarpus, which is thought to be derived from a common ancestor. However, P. camtschaticus mtDNA showed tRNA translocation in two blocks compared to that of P. longicarpus. Prior to this study, complete mt genomes of only two species of Anomura have been reported. Thus, our genomic data will provide additional information for constructing the decapod phylogeny.


Mitochondrial DNA | 2013

The complete mitochondrial genome of the Japanese ghost shrimp Nihonotrypaea japonica (Crustacea, Decapoda, Axiidea)

Sanghee Kim; Dong-Ha Ahn; Joong-Ki Park; Se-Joo Kim; Han-Gu Choi; Gi-Sik Min

We determined the complete mitochondrial (mt) genome sequence of the Japanese ghost shrimp Nihonotrypaea japonica (Ortmann 1891) (Crustacea, Decapoda, Axiidea). The N. japonica mt genome is first represented in infraorder Axiidea, which, together with infraorder Gebiidea, belonged to infraorder Thalassinidea until recently. The genome sequence of N. japonica is 15,274 bp in size, and the gene arrangement and transcriptional polarity are partially different from that of the Japanese mud shrimp, Upogebia major, which belongs to the infraorder Gebiidea. We present the mt genome of N. japonica, which could provide useful molecular information to construct a stable classification for infraorder Thalassinidea and to better understand the phylogenetic relationship of Thalassinidea with other decapod groups.


Mitochondrial DNA | 2014

Complete mitochondrial genome of the Antarctic barnacle Lepas australis (Crustacea, Maxillopoda, Cirripedia)

Ye-Seul Baek; Gi-Sik Min; Sanghee Kim; Han-Gu Choi

Abstract We present the complete mitochondrial genome of the Antarctic barnacle Lepas australis (Cirripedia, Thoracica, Lepadidae). The genome sequence is 15,502 bp in size. Except for CO1, 12 protein-coding genes (PCGs) start with an ATN initiation codon (ATA, ATG, ATC and ATT). Twelve PCGs were terminated with TAA or TAG stop codon, whereas ND1 possessed an incomplete termination codon (T– –). We compared the mitogenome structure of L. australis to those of other cirripeds and a typical arthropod Homarus americanus. The PCGs in the L. australis mtgenome showed a typical gene arrangement, identical to the arthropod pattern in other cirriped genomes. However, at least 8 tRNA genes were translocated and 2 tRNA genes were inverted in the coding polarity. Unique differences in L. australis mtgenome included translocation of trnS2, trnD and trnI. These results are useful for understanding the phylogenetic relationships among cirripedians, and additional mtgenome information of barnacles including the polar species would allow exploration of the thoracican relationships and mtgenome modifications in the barnacle evolution.

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Sanghee Kim

Seoul National University

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Yeong-Deok Han

Kongju National University

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