• IMMUNE NETWORK
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• 제11권1호
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• pp.50-58
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• 2011

Background: Epstein-Barr virus associated gastric lymphoepithelioma-like carcinoma (LELC) is characterized by the intensive infiltration of lymphoid cells, the presence of EBV, and the better prognosis over typical adenocarcinoma. Thus, it was assumable that viral latent proteins may be responsible for the recruitment of a certain T cell repertoire to EBV-associated gastric carcinoma. Methods: To examine above possibility, EBV gene expression in gastric carcinoma tissues and usage of TCR among the tumor infiltrating lymphocytes were analyzed. Results: EBV specific DNA and EBERs RNA were detected in 4 out of 30 patients. RT-PCR analysis revealed that all 4 of EBV-positive tumor tissues expressed EBNA1 mRNA and BARTs and LMP2a was detected only one sample out of 4. However, the EBNA2 and LMP-1 transcripts were not detected in these tissues. $CD8^+$ T cells were the predominant population of infiltrating lymphocytes in the EBV-positive gastric carcinoma. According to spectra type analysis of infiltrating T cells, 10 predominant bands were detected by TCR $V{\beta}$ CDR3 specific RT-PCR from 4 EBV-positive tumor tissues. Sequence analysis of these bands revealed oligoclonal expansion of T cells. Conclusion: These findings suggest that clonally expanded T cells in vivo might be a population of cytotoxic T cells reactive to EBV-associated gastric carcinoma.

• Journal of Microbiology and Biotechnology
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• 제18권7호
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• pp.1203-1206
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• 2008

A Gram-positive strain designated as MSL-$14^T$ isolated from a soil sample collected from Bigeum Island, Korea, was subjected to polyphasic taxonomy. The isolate was strictly aerobic. Cells were short rods and motile. Optimum growth temperature and pH was 28$^{\circ}C$ and 7.0, respectively. It was characterized chemotaxonomically as having a cell-wall peptidoglycan type based on LL-2,6-diaminopimelic acid and MK-$8(H_4)$ as the predominant menaquinone. The major fatty acids were iso-$C_{16:0}$, $C_{17:1}$ omega8c, and $C_{18:1}$ omega9c. The G+C content was 67.6 mol%. Phylogenetic analysis based on the 16S rRNA gene sequence revealed that strain MSL-$14^T$ is affiliated to the genus Nocardioides and formed a distinct lineage within the genus. MSL-$14^T$ showed highest sequence similarity to Nocardioides aestuarii JCM $12125^T$, having a similarity of 96.5%. Based on the 16S rRNA gene sequence divergence and phenotypic characteristics, it is proposed that strain MSL-$14^T$ should be classified as representing a novel member of the genus Nocardioides, for which we propose the name Nocardioides tritolerans sp. novo The type strain is strain MSL-$14^T$ (=KCTC $19289^T$=DSM $19320^T$).

• BMB Reports
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• 제47권4호
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• pp.192-196
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• 2014

RNA polymerase II carboxyl-terminal domain (pol II CTD) phosphatases are a newly emerging family of phosphatases that are members of DXDX (T/V). The subfamily includes Small CTD phosphatases, like SCP1, SCP2, SCP3, TIMM50, HSPC129 and UBLCP. Extensive study of SCP1 has elicited the diversified roles of the small C terminal domain phosphatase. The SCP1 plays a vital role in various biological activities, like neuronal gene silencing and preferential Ser5 dephosphorylation, acts as a cardiac hypertrophy inducer with the help of its intronic miRNAs, and has shown a key role in cell cycle regulation. This short review offers an explanation of the mechanism of action of small CTD phosphatases, in different biological activities and metabolic processes.

• 한국자원식물학회:학술대회논문집
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• 한국자원식물학회 2021년도 춘계학술대회
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• pp.22-22
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• 2021

큰졸방제비꽃(Viola kusanoana)의 엽록체 DNA 염기서열을 밝히고자 차세대염기서열분석법(NGS)을 이용하여 분석하였다. 재료는 경상북도 울릉군 나리분지에 자생하는 개체의 잎을 사용하였다. 염기서열 분석결과, 총 길이는 158,644 bp 였고, GC함량은 36.3%로 분석되었다. 구간별로는 LSC (Large single copy)지역이 86,999 bp (GC content: 33.9%)였고 SSC (Small single copy)지역은 17,439 bp (GC content: 29.9%)으로 분석되었으며 IR (Invertied repeats)지역은 27,103 bp (GC content: 42.2%)로 확인되었다. 유전자는 protein coding gene 77개, tRNA gene 30개, rRNA 4개 등 총 111개로 이는 선행 연구된 제비꽃속 8개 분류군과 유전자의 순서와 방향이 모두 일치하였다. 이를 통해 제비꽃속의 엽록체 게놈의 유전자는 상당히 보존되어 있음을 확인하였다.

• 한국미생물·생명공학회지
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• 제52권2호
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• pp.204-207
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• 2024

Here, we report the whole-genome sequence of Myxococcus stipitatus KYC2006, a bacterium whose conditioned media affect the growth of photosynthetic microorganisms such as cyanobacteria and microalgae. The genome of M. stipitatus KYC2006 was assembled into a 10,311,252 bp circular genome with 68.5% of GC content, containing 7,949 protein-coding genes, 12 rRNA genes, and 79 tRNA genes. Further analysis revealed that there are 29 secondary metabolite biosynthetic gene clusters in M. stipitatus KYC2006. These results suggest that M. stipitatus KYC2006 holds a significant potential as a resource for research on the development of biocontrol agents and value-added products from photosynthetic microorganisms.

• 생명과학회지
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• 제30권8호
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• pp.701-707
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• 2020

Clustered regularly interspaced short palindromic repeat (CRISPR)/CRISPR associated protein (Cas)9을 이용하는 유전자 가위 기술은 미래 육종 기술로서 주목받고 있다. 본 연구에서는 3세대 유전자 가위 CRISPR/Cas9을 이용한 누에 kynurenine 3-monooxygenase (KMO) 유전자 편집을 통한 돌연변이 유발 및 선택 교배를 통하여 유전자의 세대간 전달을 분석하고자 하였다. 유전자 편집을 위하여 누에의 KMO 유전자에 대한 3종의 가이드 RNA를 제작하고, 제작된 gRNA는 Cas9 단백질과 복합체를 형성시켜 누에 세포주(BM-N)에 도입 후 T7 endonuclease I 분석을 수행하여 최적의 gRNA를 선발하였다. 선발된 K1N gRNA는 누에 유전자를 편집하기 위하여 Cas9 단백질과 복합체를 형성시킨 후 누에 초가 배아에 미세주사하고 사육하였다. 미세주사 후 부화율은 18% 가량으로 낮게 나타났으나 생존한 개체 중 돌연변이 발생율은 60% 이상으로 비교적 높게 나타났다. 돌연변이가 발생된 G0세대의 KMO 유전자는 이형접합자 형태로 나타났으며, 표현형의 변화는 관찰되지 않았다. 하지만 이형접합자들 사이의 근친 교배에 의해 탄생한 G1세대 돌연변이에서는 일부에서 알과 눈의 색 변화가 확인되었으며, 변이가 확인된 개체들사이의 근친교배를 통해 생산된 G2세대에서는 모든 개체에서 표현형의 변화가 나타났다. 이러한 결과에 비추어 볼 때, 유전자 가위를 이용한 돌연변이 육종에는 한계가 있으나 전통 교배 육종과 융합을 통하여 육종 기간을 비약적으로 단축시킬 수 있는 곤충 육종 기술로 발전가능성이 높다고 판단된다.

• 한국동물학회:학술대회논문집
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• 한국동물학회 1999년도 한국생물과학협회 학술발표대회
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• pp.43.1-43
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• 1999

No Abstract, See Full Text

• Asian Pacific Journal of Cancer Prevention
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• 제15권21호
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• pp.9327-9333
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• 2014

Breast cancer is the second most common cancer and second leading cause of cancer deaths in women. Phosphatidylinositol-3-kinase (PI3K)/AKT pathway mutations are associated with cancer and phosphatidylinositol-4, 5-bisphosphate 3-kinase catalytic subunit alpha (PIK3CA) gene mutations have been observed in 25-45% of breast cancer samples. Insulin growth factor binding protein-5 (IGFBP-5) can show different effects on apoptosis, cell motility and survival in breast cancer. We here aimed to determine the association between PIK3CA gene mutations and IGFBP-5 expressions for the first time in breast cancer patients. Frozen tumor samples from 101 Turkish breast cancer patients were analyzed with high resolution melting (HRM) for PIK3CA mutations (exon 9 and exon 20) and 37 HRM positive tumor samples were analyzed by DNA sequencing, mutations being found in 31. PIK3CA exon 9 mutations (Q546R, E542Q, E545K, E542K and E545D) were found in 10 tumor samples, exon 20 mutations (H1047L, H1047R, T1025T and G1049R) in 21, where only 1 tumor sample had two exon 20 mutations (T1025T and H1047R). Moreover, we detected one sample with both exon 9 (E542Q) and exon 20 (H1047R) mutations. 35% of the tumor samples with high IGFBP-5 mRNA expression and 29.4% of the tumor samples with low IGFBP-5 mRNA expression had PIK3CA mutations (p=0.9924). This is the first study of PIK3CA mutation screening results in Turkish breast cancer population using HRM analysis. This approach appears to be a very effective and reliable screening method for the PIK3CA exon 9 and 20 mutation detection. Further analysis with a greater number of samples is needed to clarify association between PIK3CA gene mutations and IGFBP-5 mRNA expression, and also clinical outcome in breast cancer patients.

• 한국응용약물학회:학술대회논문집
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• 한국응용약물학회 1997년도 춘계학술대회
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• pp.107-107
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• 1997

Cytochrome P450 enzymes have been intensively investigated in hepatic tissues and several mammalian cell lines. Compared to most studies about cytochrome P450 isozymes in liver in vivo and hepatic, cell lines in vitro, the study of cytochrome P450IA1 in human breast cancer cells could be very important to understand the mechanism of the regulation of CYPIA1 gene expression and cell growth. MCF-7 human breast cancer cells are well characterized to study estrogen and antiestrogen action due to the fact that they contain high level of estrogen receptor and have biological markers characterized. And also MCF-7 cells express high level of arylhydrocarbon hydroxylase activity and human cytochrome P450IA1 cDNA was cloned from MCF-7 cells. Ah receptor was characterized in many breast cancer cell lines and polycyclic aromatic hydrocarbon such as 3-MC induced the expression of CYPIA1 gene and cytochrome P450- dependent monooxygenase activity. We undertook a study to examine the effect of estrogens and other chemicals on the regulation of human CYPIA1 gene expression in MCF-7 cells via RTPCR analysis, that might help us to understand the mechanism of the regulation of CYPIA1 gene expression and MCF-7 cell growth. Expression vector containing the functional 5'-regulatory region of human CYPIA1 fused to the CAT reporter gene was transfected into estrogen receptor positive MCF-T cells or estrogen receptor negative MDA-MB-231 cells. After these cells were treated with various chemicals, RTPCR was carried out to measure both CYPIA1 mRNA and CAT mRNA levels. 1nM 3-MC increased in both P450 and CAT mRNA levels over those of control by two folds in MCF-7 cells but does not in MDA-MB-231 cells. Estrogen or tamoxifen or retinoic acid or chrysin decreased in both P450 and CAT mRNA levels that were induced by 3-MC in MCF-7 when each chemical was administered with 3-MC concomitantly. These results suggested that the level of CYPIA1 gene expression is modulated with estrogen-related molecules and make it possible to speculate that ER is related to CYPIA1 gene expression and cell growth in breast cancer cells. [Supported by grants from the Korean Ministry of Education ]

• Parasites, Hosts and Diseases
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• 제50권2호
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• pp.103-111
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• 2012

Intestinal giant-cystic disease (IGCD) of the Israel carp (Cyprinus carpio nudus) has been recognized as one of the most serious diseases afflicting inland farmed fish in the Republic of Korea, and Thelohanellus kitauei has been identified as the causative agent of the disease. Until now, studies concerning IGCD caused by T. kitauei in the Israel carp have been limited to morphological and histopathological examinations. However, these types of diagnostic examinations are relatively time-consuming, and the infection frequently cannot be detected in its early stages. In this study, we cloned the full-length 18S rRNA gene of T. kitauei isolated from diseased Israel carps, and carried out molecular identification by comparing the sequence with those of other myxosporeans. Moreover, conventional PCR and real-time quantitative PCR (qPCR) using oligonucleotide primers for the amplification of 18S rRNA gene fragment were established for further use as methods for rapid diagnosis of IGCD. Our results demonstrated that both the conventional PCR and real-time quantitative PCR systems applied herein are effective for rapid detection of T. kitauei spores in fish tissues and environmental water.