• Proceedings of the Korean Society of Toxicology Conference
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• 2002.11b
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• pp.167-167
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• 2002

Many pesticides possess hormonal activity and have been thus classified as endocrine disruptors. Permethrin, a pyrethroid insecticide has little been characterized to it's hormonal potential. In the present study, effects of neonatal exposure to permethrin on the sex steroid receptor levels and hoxa-10 expression of the uteri were investigated in female mice.(omitted)

• Proceedings of the Korea Environmental Mutagen Society Conference
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• 2002.11a
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• pp.167-167
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• 2002

• Animal cells and systems
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• v.16 no.4
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• pp.289-294
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• 2012

Histone methylation has diverse functions including transcriptional regulation via its lysine or arginine residue methylation. Studies indicate that deregulation of histone methylation is linked to human cancers including leukemia. Histone H3K27 methyltrnasferase response element II binding protein (RE-IIBP), as a transcriptional repressor to target gene IL-5, interacts with HDAC and is over-expressed in leukemia patient samples. In this study, we have identified that hematopoiesis-related genes GATA1 and HOXA9 are down-regulated by RE-IIBP in K562 and 293T cells. Transient reporter analysis revealed that GATA1 transcription was repressed by RE-IIBP. On the other hand, HOXA9 and PBX-related homeobox gene MEIS1 was up-regulated by RE-IIBP. These results suggest that RE-IIBP might have a role in hematopoiesis or leukemogenesis by regulating the transcription of target genes, possibly via its H3K27 methyltransferase activity.

• Proceedings of the PSK Conference
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• 2000.04a
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• pp.128.1-128.1
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• 2000

• Biomedical Science Letters
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• v.12 no.3
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• pp.139-143
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• 2006

Jopock (Jpk) has previously been ascertained that induces both bacterial and mammalian cell death. The Escherichia coli cells expressing Glutathion S-transferase (GST) fused Jpk showed elongated phenotype and inhibited cell growth which led eventual cell death. In an attempt to search the genetic suppressor of the lethal protein Jpk in bacterial cells, we constructed a unidirectional protein expression vector inserting tac promoter next to the C-terminus Jpk in pGEX-Jpk. The function of additional tac promoter was confirmed by substituting lac promoter in Plac-TOPO plasmid. The cells harboring plac- TOPO, which regulates $lacZ{\alpha}$ gene expression under lac promoter, formed blue colonies in 5-bromo-4-3 $indolyo-{\beta}-D-galactoside$ (X-gal) plate. When lac promoter was changed to tac promoter, same results were observed. Since the addition of tac promoter did not affect the toxic effect of Jpk, the pGEX-Jpk-ptac could be a useful vector for the screening of suppressor(s) for Jpk, in which GST-Jpk and a putative Jpk-suppressing protein are coexpressing from two unidirectional tac promoters, which response to the same inducer, $isopropyl-{\beta}-D-thiogalactopyranoside (IPTG)$.

• Biomedical Science Letters
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• v.9 no.1
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• pp.1-8
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• 2003

Liver is an organ having an ability to regenerate by itself when it is damaged or removed. Since the research on the liver regeneration so far was regarding on the cellular multiplications not the formation of the shape, we intended to analyze the expression pattern of Hox genes during liver regeneration. RNA samples isolated from liver at the time of partial hepatectomy, 4 hours as well as 3 days later following regeneration were used to perform RT-PCR with Hox-specific degenerate primers. The PCR products were cloned, sequenced and analyzed through BLAST program. Genes belonging to the AbdB type Hox genes (paralogous groups IX-XIII) expressed predominantly during regeneration, while the other group (I-VII), especially Hoxal and bl seemed to be expressed continuously before and after regeneration. These data altogether imply that paralogous group IX and X genes including Hoxa10 and d10 seemed to be regeneration specific genes of liver.

• Molecules and Cells
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• v.38 no.6
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• pp.548-561
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• 2015

By combining conventional single cell analysis with flow cytometry and public database searches with bioinformatics tools, we extended the expression profiling of thymic stromal cotransporter (TSCOT), Slc46A2/Ly110, that was shown to be expressed in bipotent precursor and cortical thymic epithelial cells. Genome scale analysis verified TSCOT expression in thymic tissue- and cell type- specific fashion and is also expressed in some other epithelial tissues including skin and lung. Coexpression profiling with genes, Foxn1 and Hoxa3, revealed the role of TSCOT during the organogenesis. TSCOT expression was detected in all thymic epithelial cells (TECs), but not in the $CD31^+$endothelial cell lineage in fetal thymus. In addition, ABC transporter-dependent side population and Sca-$1^+$ fetal TEC populations both contain TSCOT-expressing cells, indicating TEC stem cells express TSCOT. TSCOT expression was identified as early as in differentiating embryonic stem cells. TSCOT expression is not under the control of Foxn1 since TSCOT is present in the thymic rudiment of nude mice. By searching variations in the expression levels, TSCOT is positively associated with Grhl3 and Irf6. Cytokines such as IL1b, IL22 and IL24 are the potential regulators of the TSCOT expression. Surprisingly, we found TSCOT expression in the lung is diminished in lung cancers, suggesting TSCOT may be involved in the suppression of lung tumor development. Based on these results, a model for TEC differentiation from the stem cells was proposed in context of multiple epithelial organ formation.

• Biomedical Science Letters
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• v.18 no.2
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• pp.169-174
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• 2012

The placenta is an extraembryonic tissue that is formed between mother and fetus and mediates delivery of nutrients and oxygen from the mother to the fetus. Because of its essential role in sustaining the growth of the fetus during gestation, defects in its development and function frequently result in fetal growth retardation or intrauterine death, depending on its severity. Vertebrate Hox genes are well known transcription factors that are essential for the proper organization of the body plan during embryogenesis. However, certain Hox genes have been known to be expressed in placenta, implying that Hox genes not only play a crucial role during embryonic patterning but also play an important role in placental development. So far, there has been no report that shows the expression pattern of the whole Hox genes during placentation. In this study, therefore, we investigated the Hox gene expression pattern in mouse placenta, from day 10.5 to 18.5 of gestation using real-time RT-PCR method. In general, the 5' posterior Hox genes were expressed more in the developing placenta compared to the 3' Hox genes. Statistical analysis revealed that the expression of 15 Hox genes (Hoxa9, -a11, -a13/ -b8, -b9/ -c6, -c9, -c13/ -d1, -d3, -d8, -d9, -d10, -d11, -d12) were significantly changed in the course of gestation. The majority of these genes showed highest expression at gestational day 10.5, suggesting their possible role in the early stage during placental development.

• Biomedical Science Letters
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• v.11 no.2
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• pp.135-141
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• 2005

A Jopock (Jpk), a trans-acting factor associating with the position-specific regulatory element of murine Hoxa-7, has shown to have a toxicity to both prokaryotic and eukaryotic cells when overexpressed. Since Jpk protein harbors a transmembrane domain and a putative endoplasmic reticulum (ER)-retention signal at the N-terminus, a subcellular localization of the protein was analyzed after fusing it into the green fluorescent protein (GFP): Both N-term (Jpk-EGFP) and C-term tagged-Jpk (EGFP-Jpk) showed to be localized in the ER when analyzed under the fluorescence microscopy after staining the cells with ER- and MitoTracker. Since ER stress triggers the ER-stress mediated apoptosis to eliminate the damaged cells, we analyzed the expression pattern of Jpk under ER-stress condition. When MCF7 cells were treated with the ER-stress inducer such as DTT and EGTA, the expression of Jpk was upregulated at the transcriptional level like that of Grp78, a molecular chaperone well known to be overexpressed under ER-stress condition. In the presence of high concentration of ER-sterss inducer (10 mM), about 70 (DTT) to $95\%$ (EGTA) of cells died stronly expressing ($10\~12$ fold) Jpk. Whereas at the low concentration ($0.001\~1.0\;mM$) of the inducer, the expression of Jpk was increased about 2.5 (EGTA) to 5 fold (DTT), which is rather similar to those of ER chaperone protein Grp78. These results altogether indicate that the ER-stress upregulated the expression of Jpk and the excess stress induces the ER-stress induced apoptosis and the concomitant expression of Jpk.

• Journal of Animal Science and Technology
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• v.65 no.1
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• pp.57-68
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• 2023

Flavor is an important sensory trait of chicken meat. The free amino acid (FAA) and nucleotide (NT) components of meat are major factors affecting meat flavor during the cooking process. As a genetic approach to improve meat flavor, we performed a genome-wide association study (GWAS) to identify the potential candidate genes related to the FAA and NT components of chicken breast meat. Measurements of FAA and NT components were recorded at the age of 10 weeks from 764 and 767 birds, respectively, using a White leghorn and Yeonsan ogye crossbred F2 chicken population. For genotyping, we used 60K Illumina single-nucleotide polymorphism (SNP) chips. We found a total of nine significant SNPs for five FAA traits (arginine, glycine, lysine, threonine content, and the essential FAAs and one NT trait (inosine content), and six significant genomic regions were identified, including three regions shared among the essential FAAs, arginine, and inosine content traits. A list of potential candidate genes in significant genomic regions was detected, including the KCNRG, KCNIP4, HOXA3, THSD7B, and MMUT genes. The essential FAAs had significant gene regions the same as arginine. The genes related to arginine content were involved in nitric oxide metabolism, while the inosine content was possibly affected by insulin activity. Moreover, the threonine content could be related to methylmalonyl-CoA mutase. The genes and SNPs identified in this study might be useful markers in chicken selection and breeding for chicken meat flavor.