• Title, Summary, Keyword: bio-marker

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CAPS Marker Linked to Tomato Hypocotyl Pigmentation

  • Kim, Hyoun-Joung;Lee, Heung-Ryul;Hyun, Ji-Young;Won, Dong-Chan;Hong, Dong-Oh;Harn, Chee-Hark
    • Horticultural Science & Technology
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    • v.30 no.1
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    • pp.56-63
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    • 2012
  • Tomato hypocotyl can generally be one of two colors, purple or green. Genetically, this trait is controlled by a single dominant gene. Hypocotyl tissue specific color expression is one of many visible genetic marker sources used to select tomato progeny. However, the visible marker does not show a clear distinction between homozygous genotype and heterozygous genotype from the breeding lines. Therefore, to identify a hypocotyl pigmentation related marker, we screened DNA polymorphisms in thirteen tomato lines showing purple or green hypocotyls. The markers used for screening consisted of primer set information obtained from anthocyanin related genes, conserved ortholog set II (COS II) marker sets localized near anthocyanin related genes, and restriction fragment length polymorphism (RFLP) markers localized near COS II markers, which produce polymorphisms between purple and green tomatoes. One primer from a RFLP fragment resulted in a polymorphism on agarose gel electrophoresis. From the RFLP fragment, a cleaved amplified polymorphic sequence (CAPS) marker was developed to distinguish between purple and green hypocotyls. The genotypes of 135 $F_2$ individuals were analyzed using the CAPS marker, and among them, 132 individuals corresponded to the phenotypes of hypocotyl pigmentation.

A Co-inhibitory Molecule, B7-H4, Synergistically Potentiates Oral Tolerance by Inducing CD4+CD25+FoxP3+ T Cells

  • Wen, Lanying;Yang, Sung-Yeun;Choi, Jae-Kyoung;Kim, Young-Hee;Kwon, Eun-Hee;Lee, Hyun-Ji;Jeoung, Hae-Young;Hwang, Du-Hyeon;Hwang, Dong-Jin;Choi, In-Hak
    • IMMUNE NETWORK
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    • v.8 no.1
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    • pp.21-28
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    • 2008
  • Background: A co-inhibitory molecule, B7-H4, is believed to negatively regulate T cell immunity by suppressing T cell proliferation and inhibiting cytokine production. However, the mechanism behind B7-H4-mediated tolerance remains unclear. Methods: Balb/c $(H-2^d)$ mice were fed with dendritic cell line, DC2.4 $(H-2^d)$ every day for 10 days. Meantime, mice were hydrodynamically injected with recombinant plasmid expressing B7-H4 fusion protein (B7-H4.hFc) or hFc via tail vein. One day after last feeding, mice were immunized with allogeneic B6 spleen cells. 14 days following immunization, mice were challenged with B6 spleen cells to ear back and the ear swelling was determined the next day. Subsequently, a mixed lymphocyte reaction (MLR) was also performed and cytokines profiles from the reaction were examined by sandwich ELISA. Frequency of immunosuppressive cell population was assayed with flow cytometry and mRNA for FoxP3 was determined by RT-PCR. Results: Tolerant mice given plasmid expressing B7-H4.hFc showed a significant reduction in ear swelling compared to control mice. In addition, T cells from mice given B7-H4.hFc plasmid revealed a significant hyporesponsiveness of T cells against allogeneic spleen cells and showed a significant decrease in Th1 and Th2 cytokines such as IFN-${\gamma}$, IL-5, and TNF-${\alpha}$. Interestingly, flow cytometric analysis showed that the frequency of CD4+CD25+FoxP3+ Tregs in spleen was increased in tolerant mice given recombinant B7-H4.hFc plasmid compared to control group. Conclusion: Our results demonstrate that B7-H4 synergistically potentiates oral tolerance induced by allogeneic cells by increasing the frequency of FoxP3+ CD4+CD25+ Treg and reducing Th1 and Th2 cytokine production.

Application of Disease Resistance Markers for Developing Elite Tomato Varieties and Lines

  • Kim, Hyoun-Joung;Lee, Heung-Ryul;Hyun, Ji-Young;Won, Dong-Chan;Hong, Dong-Oh;Cho, Hwa-Jin;Lee, Kyung-Ah;Her, Nam-Han;Lee, Jang-Ha;Harn, Chee-Hark
    • Horticultural Science & Technology
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    • v.29 no.4
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    • pp.336-344
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    • 2011
  • Using the abundant available information about the tomato genome, we developed DNA markers that are linked to disease resistant loci and performed marker-assisted selection (MAS) to construct multi-disease resistant lines and varieties. Resistance markers of Ty-1, T2, and I2, which are linked to disease resistance to Tomato yellow leaf curl virus (TYLCV), Tomato mosaic virus (ToMV), and Fusarium wilt, respectively, were developed in a co-dominant fashion. DNA sequences near the resistance loci of TYLCV, ToMV, and Fusarium wilt were used for primer design. Reported candidate markers for powdery mildew-resistance were screened and the 32.5Cla marker was selected. All four markers (Ty-1, T2, I2, and 32.5Cla) were converted to cleavage amplification polymorphisms (CAPS) markers. Then, the CAPS markers were applied to 96 tomato lines to determine the phenetic relationships among the lines. This information yielded clusters of breeding lines illustrating the distribution of resistant and susceptible characters among lines. These data were utilized further in a MAS program for several generations, and a total of ten varieties and ten inbred lines were constructed. Among four traits, three were introduced to develop varieties and breeding lines through the MAS program; several cultivars possessed up to seven disease resistant traits. These resistant trait-related markers that were developed for the tomato MAS program could be used to select early stage seedlings, saving time and cost, and to construct multi-disease resistant lines and varieties.

Telomere의 양적 분석을 이용한 닭의 bio-marker개발

  • 조은정;최철환;전익수;박철;손시환
    • Proceedings of the Korea Society of Poultry Science Conference
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    • pp.13-15
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    • 2004
  • Telomeres are the end of chromosomes and consist of a tandem repeat sequence of (TTAGGG)n and associated proteins. Telomeres are essential for chromosome stability and are related with cell senescence and apoptosis. This study was carried out to analyze the amount of telomeric DNA of chicken lymphocytes, which is to considered as bio-marker. The amount of telomeric DNA of lymphocytes in Korean Native Chicken and White Leghorn was analyzed by quantitative-fluorescence in situ hybridization (Q-FISH) technique using the chicken telomeric DNA probe. Telomere quantifies were compared among breeds, ages and sex, and the relationship between the amount of telomeres and their productive trait was also analyzed. Comparing the amount of telomeric DNA on lymphocytes during growing period, the amount of telomeres was gradually decreased as growing older. The telomere quantity was also significantly different in breeds and sex. Estimating correlation coefficient, the amount of telomeres was positively correlated to sexual maturity and body weight but negatively correlated to hen day egg production and egg weight. These results implicate the telomere quantity is considered as an individual bio-marker.

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Cholecystokinin as a Potent Diagnostic Marker for Gastric Cancer

  • Akter, Hafeza;Yoo, Young Sook;Park, Won Sang;Kang, Min-Jung
    • BioChip Journal
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    • v.11 no.1
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    • pp.14-20
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    • 2017
  • There is no early diagnosis marker for gastric cancer even though the gastric cancer is the second cause of deaths in East Asia. The aim of the current research is to develop a new diagnostic marker of gastric cancer. Commercially available ELISA kits were used to evaluate the peptide levels in plasma collected from Korean healthy and gastric cancer patients. About 1.5 fold decreased plasma cholecystokinin levels were measured in gastric cancer patients(n=75) than in healthy controls (n=36). Plasma cholecystokinin has no age, sex, and disease-dependent variation in control and patients sample. Receiver-operating characteristic curve analysis assessing the performance of cholecystokinin levels as the sensitivity of 94.7% and specificity of 100 % compared to healthy controls. These findings suggest plasma cholecystokinin as a useful biomarker for diagnosis of gastric cancer.

How Many SNPs Should Be Used for the Human Phylogeny of Highly Related Ethnicities? A Case of Pan Asian 63 Ethnicities

  • Ghang, Ho-Young;Han, Young-Joo;Jeong, Sang-Jin;Bhak, Jong;Lee, Sung-Hoon;Kim, Tae-Hyung;Kim, Chul-Hong;Kim, Sang-Soo;Al-Mulla, Fahd;Youn, Chan-Hyun;Yoo, Hyang-Sook;The HUGO Pan-Asian SNP Consortium, The HUGO Pan-Asian SNP Consortium
    • Genomics & Informatics
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    • v.9 no.4
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    • pp.181-188
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    • 2011
  • In planning a model-based phylogenic study for highly related ethnic data, the SNP marker number is an important factor to determine for relationship inferences. Genotype frequency data, utilizing a sub sampling method, from 63 Pan Asian ethnic groups was used for determining the minimum SNP number required to establish such relationships. Bootstrap random sub-samplings were done from 5.6K PASNPi SNP data. DA distance was calculated and neighbour-joining trees were drawn with every re-sampling data set. Consensus trees were made with the same 100 sub-samples and bootstrap proportions were calculated. The tree consistency to the one obtained from the whole marker set, improved with increasing marker numbers. The bootstrap proportions became reliable when more than 7,000 SNPs were used at a time. Within highly related ethnic groups, the minimum SNPs number for a robust neighbor-joining tree inference was about 7,000 for a 95% bootstrap support.