42 results on '"Xiang, Tao"'
Search Results
2. Glucagon-like peptide-1 receptor agonist exendin 4 ameliorates diabetes-associated vascular calcification by regulating mitophagy through the AMPK signaling pathway
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Chen, Kui, Jin, Hao-jie, Wu, Zi-heng, Zhang, Bao-fu, Wu, Jun, Huang, Zi-yi, Huang, Ying-peng, Lu, Xin-wu, and Zheng, Xiang-tao
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- 2024
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3. An important issue of burnout among pre-hospital emergency medical personnel in Chengdu: a cross-sectional study
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Liu, ZhiJiang, Luo, Li, Dai, Hang, Zhang, Bihua, Ma, Lin, and Xiang, Tao
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- 2024
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4. E-GWAS: an ensemble-like GWAS strategy that provides effective control over false positive rates without decreasing true positives
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Zhou, Guang-Liang, Xu, Fang-Jun, Qiao, Jia-Kun, Che, Zhao-Xuan, Xiang, Tao, Liu, Xiao-Lei, Li, Xin-Yun, Zhao, Shu-Hong, and Zhu, Meng-Jin
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- 2023
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5. Genomic evaluation for two-way crossbred performance in cattle
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Mei, Quanshun, Liu, Huiming, Zhao, Shuhong, Xiang, Tao, and Christensen, Ole F
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- 2023
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6. Impacts of additive, dominance, and inbreeding depression effects on genomic evaluation by combining two SNP chips in Canadian Yorkshire pigs bred in China
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Mei, Quanshun, Vitezica, Zulma G., Li, Jielin, Zhao, Shuhong, Legarra, Andres, and Xiang, Tao
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- 2022
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7. Genome-wide association and transcriptome studies identify candidate genes and pathways for feed conversion ratio in pigs
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Miao, Yuanxin, Mei, Quanshun, Fu, Chuanke, Liao, Mingxing, Liu, Yan, Xu, Xuewen, Li, Xinyun, Zhao, Shuhong, and Xiang, Tao
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- 2021
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8. Enoxaparin-induced reactive thrombocytosis: a case report
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Xiang, Tao and Cheng, Ming
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- 2021
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9. Ruptured sinus of valsalva aneurysm presenting as syncope and hypotension: a case report
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Zhuo, Guang Ying, Zhang, Pei Yong, Luo, Li, Tang, Qian, and Xiang, Tao
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- 2021
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10. Correction to: A bivariate genomic model with additive, dominance and inbreeding depression effects for sire line and three-way crossbred pigs
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Christensen, Ole F., Nielsen, Bjarne, Su, Guosheng, Xiang, Tao, Madsen, Per, Ostersen, Tage, Velander, Ingela, and Strathe, Anders B.
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- 2020
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11. Identification of differentially expressed genes and pathways between intramuscular and abdominal fat-derived preadipocyte differentiation of chickens in vitro
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Zhang, Meng, Li, Fang, Ma, Xiang-fei, Li, Wen-ting, Jiang, Rui-rui, Han, Rui-li, Li, Guo-xi, Wang, Yan-bin, Li, Zi-yi, Tian, Ya-dong, Kang, Xiang-tao, and Sun, Gui-rong
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- 2019
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12. A bivariate genomic model with additive, dominance and inbreeding depression effects for sire line and three-way crossbred pigs
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Christensen, Ole F., Nielsen, Bjarne, Su, Guosheng, Xiang, Tao, Madsen, Per, Ostersen, Tage, Velander, Ingela, and Strathe, Anders B.
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- 2019
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13. Single-step genomic evaluation with metafounders for feed conversion ratio and average daily gain in Danish Landrace and Yorkshire pigs.
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Fu, Chuanke, Ostersen, Tage, Christensen, Ole F., and Xiang, Tao
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YORKSHIRE swine ,BIVARIATE analysis ,PROBLEM solving ,SWINE - Abstract
Background: The single-step genomic best linear unbiased prediction (SSGBLUP) method is a popular approach for genetic evaluation with high-density genotype data. To solve the problem that pedigree and genomic relationship matrices refer to different base populations, a single-step genomic method with metafounders (MF-SSGBLUP) was put forward. The aim of this study was to compare the predictive ability and bias of genomic evaluations obtained with MF-SSGBLUP and standard SSGBLUP. We examined feed conversion ratio (FCR) and average daily gain (ADG) in DanBred Landrace (LL) and Yorkshire (YY) pigs using both univariate and bivariate models, as well as the optimal weighting factors (ω), which represent the proportions of the genetic variance not captured by markers, for ADG and FCR in SSGBLUP and MF-SSGBLUP. Results: In general, SSGBLUP and MF-SSGBLUP showed similar predictive abilities and bias of genomic estimated breeding values (GEBV). In the LL population, the predictive ability for ADG reached 0.36 using uni- or bi-variate SSGBLUP or MF-SSGBLUP, while the predictive ability for FCR was highest (0.20) for the bivariate model using MF-SSGBLUP, but differences between analyses were very small. In the YY population, predictive ability for ADG was similar for the four analyses (up to 0.35), while the predictive ability for FCR was highest (0.36) for the uni- and bi-variate MF-SSGBLUP analyses. SSGBLUP and MF-SSGBLUP exhibited nearly the same bias. In general, the bivariate models had lower bias than the univariate models. In the LL population, the optimal ω for ADG was ~ 0.2 in the univariate or bivariate models using SSGBLUP or MF-SSGBLUP, and the optimal ω for FCR was 0.70 and 0.55 for SSGBLUP and MF-SSGBLUP, respectively. In the YY population, the optimal ω ranged from 0.25 to 0. 35 for ADG across the four analyses and from 0.10 to 0.30 for FCR. Conclusions: Our results indicate that MF-SSGBLUP performed slightly better than SSGBLUP for genomic evaluation. There was little difference in the optimal weighting factors (ω) between SSGBLUP and MF-SSGBLUP. Overall, the bivariate model using MF-SSGBLUP is recommended for single-step genomic evaluation of ADG and FCR in DanBred Landrace and Yorkshire pigs. [ABSTRACT FROM AUTHOR]
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- 2021
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14. APOBEC3B up-regulation independently predicts ovarian cancer prognosis: a cohort study
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Yan Du, Jing Wu, Yinhua Yu, Hongbo Zhao, Xiang Tao, and Huandi Yu
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0301 basic medicine ,Oncology ,Cancer Research ,medicine.medical_specialty ,endocrine system diseases ,Survival ,Expression ,Disease ,lcsh:RC254-282 ,03 medical and health sciences ,0302 clinical medicine ,Ovarian cancer ,Internal medicine ,Biopsy ,Genetics ,medicine ,Clinical significance ,lcsh:QH573-671 ,Univariate analysis ,medicine.diagnostic_test ,business.industry ,lcsh:Cytology ,Hazard ratio ,Cancer ,medicine.disease ,lcsh:Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,female genital diseases and pregnancy complications ,030104 developmental biology ,Viability ,030220 oncology & carcinogenesis ,Immunohistochemistry ,APOBEC3B ,business ,Primary Research - Abstract
Background Ovarian cancer is a heterogeneous disease with a high degree of genomic instability, pro-/antitumor immunity and inflammation, and remains the most lethal gynecologic cancer worldwide. APOBEC3B, a member of the AID/APOBEC family, is part of the innate immune system which plays a key role in combating exogenous infection especially viral infection. Studies have shown that APOBEC3B expression is elevated in a variety of cancer tissues and cell lines, and plays a prominent role in the genesis and evolution of various cancers. However, the clinical relevance of APOBEC3B in ovarian cancer needs to be further investigated. The current study aimed to evaluate the predictive value of APOBEC3B in ovarian cancer clinical outcome, and to explore possible molecular mechanisms contributing to ovarian cancer progression. Methods The expression of APOBEC3B in biopsy tissue specimens from 88 ovarian cancer patients was examined using immunohistochemistry. In addition, ovarian cancer cell lines were transfected with APOBEC3B siRNA or pLenti-APOBEC3B construct. Western blotting and SRB assay were performed to explore the role of APOBEC3B in ovarian cancer. Results Patients were followed for a median of 74.77 months following the time of surgery. Forty-two patients had died, 5 had relapsed but were still alive at the end of study, and 41 patients remained alive and had no recurrence. Over-expression of APOBEC3B was associated with advanced FIGO stage and elevated CA125 (both p
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- 2018
15. Using proteomic analysis to investigate uniconazole-induced phytohormone variation and starch accumulation in duckweed (Landoltia punctata)
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Kaize He, Mengjun Huang, Xiang Tao, Yang Liu, Hai Zhao, Yanling Jin, Jiaolong Sun, Xin-Rong Ma, and Yang Fang
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Proteomics ,Proteome ,Starch ,chemistry.chemical_compound ,Biosynthesis ,Plant Growth Regulators ,Tandem Mass Spectrometry ,Botany ,Araceae ,Abscisic acid ,Plant Proteins ,chemistry.chemical_classification ,biology ,food and beverages ,Metabolism ,Triazoles ,Enzyme assay ,Metabolic pathway ,Enzyme ,chemistry ,Biochemistry ,Isotope Labeling ,biology.protein ,Biotechnology ,Research Article ,Chromatography, Liquid - Abstract
Background Duckweed (Landoltia punctata) has the potential to remediate wastewater and accumulate enormous amounts of starch for bioethanol production. Using systematical screening, we determined that the highest biomass and starch percentage of duckweed was obtained after uniconazole application. Uniconazole contributes to starch accumulation of duckweed, but the molecular mechanism is still unclear. Results To elucidate the mechanisms of high starch accumulation, in the study, the responses of L. punctata to uniconazole were investigated using a quantitative proteomic approach combined with physiological and biochemical analysis. A total of 3327 proteins were identified. Among these identified proteins, a large number of enzymes involved in endogenous hormone synthetic and starch metabolic pathways were affected. Notably, most of the enzymes involved in abscisic acid (ABA) biosynthesis showed up-regulated expression, which was consistent with the content variation. The increased endogenous ABA may up-regulate expression of ADP-glucose pyrophosphorylase to promote starch biosynthesis. Importantly, the expression levels of several key enzymes in the starch biosynthetic pathway were up-regulated, which supported the enzymatic assay results and may explain why there is increased starch accumulation. Conclusions These generated data linked uniconazole with changes in expression of enzymes involved in hormone biosynthesis and starch metabolic pathways and elucidated the effect of hormones on starch accumulation. Thus, this study not only provided insights into the molecular mechanisms of uniconazole-induced hormone variation and starch accumulation but also highlighted the potential for duckweed to be feedstock for biofuel as well as for sewage treatment. Electronic supplementary material The online version of this article (doi:10.1186/s12896-015-0198-9) contains supplementary material, which is available to authorized users.
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- 2015
16. Comparative transcriptome analysis of tomato (Solanum lycopersicum) in response to exogenous abscisic acid
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Liang Xiao, Hong-Yuan Deng, Xin-Rong Ma, Jiaolong Sun, Xue-Feng Yan, Yan Wang, Dan Li, Xiao-Mei Tang, and Xiang Tao
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Pathogen-related proteins ,RNA-Seq ,Genes, Plant ,Tomato ,Transcriptome ,chemistry.chemical_compound ,Solanum lycopersicum ,Plant Growth Regulators ,Gene Expression Regulation, Plant ,Botany ,Databases, Genetic ,Genetics ,Transcription factors ,Exogenous ABA ,ABA signaling pathway ,Abscisic acid ,Gene ,Heat-Shock Proteins ,ROS scavenging enzymes ,Disease Resistance ,Plant Proteins ,biology ,Heat shock proteins ,Abiotic stress ,organic chemicals ,Jasmonic acid ,Gene Expression Profiling ,fungi ,food and beverages ,Molecular Sequence Annotation ,biology.organism_classification ,Gene expression profiling ,Plant Leaves ,Gene Ontology ,chemistry ,Solanum ,Biotechnology ,Research Article ,Abscisic Acid ,Signal Transduction - Abstract
BackgroundAbscisic acid (ABA) can regulate the expressions of many stress-responsive genes in plants. However, in defense responses to pathogens, mounting evidence suggests that ABA plays variable roles. Little information exists about genome-wide gene expression in ABA responses in tomato (Solanum lycopersicumL.), a model fruit crop plant.ResultsGlobal transcriptome profiles of tomato leaf responses to exogenous ABA were generated using Illumina RNA-sequencing. More than 173 million base pair reads were mapped onto the tomato reference genome and the expression pattern differences between treated and control leaves were assessed. In total, 50,616 transcripts were generated. Among them, 42,583 were functionally annotated in the NCBI non-redundant database and 47,877 in the tomato genome reference. Additionally, 31,107 transcripts were categorized into 57 functional groups based on Gene Ontology terms, and 14,371 were assigned to 310 Kyoto Encyclopedia of Genes and Genomes pathways. In both the ABA treatment and control samples, 39,671 transcripts were available to analyze their expressions, of which 21,712 (54.73%) responded to exogenous ABA. Of these transcripts, 2,787 were significantly differently expressed genes (DEGs). Many known and novel ABA-induced and -repressed genes were found. Exogenous ABA can influence the ABA signaling pathway with PYR/PYL/RCARs-PP2Cs-SnRK2s as the center. Eighteen PYL genes were detected. A large number of genes related to various transcription factors, heat shock proteins, pathogen resistance, and the salicylic acid, jasmonic acid, and ethylene signaling pathways were up-regulated by exogenous ABA.ConclusionsThe results indicated that ABA has the potential to improve pathogen-resistance and abiotic stress tolerance in tomato. This study presents the global expression analysis of ABA-regulated transcripts in tomato and provides a robust database for investigating the functions of genes induced by ABA.
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- 2013
17. Whether intermediate-risk stage 1A, grade 1/2, endometrioid endometrial cancer patients with lesions larger than 2 cm warrant lymph node dissection?
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Menghan Zhu, Nan Jia, Feifei Huang, Xiaoxia Liu, Yuqing Zhao, Xiang Tao, Wei Jiang, Qin Li, Weiwei Feng, Zhu, Menghan, Jia, Nan, Huang, Feifei, Liu, Xiaoxia, Zhao, Yuqing, Tao, Xiang, Jiang, Wei, Li, Qin, and Feng, Weiwei
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LYMPHADENECTOMY ,ENDOMETRIAL cancer risk factors ,GYNECOLOGIC cancer ,CANCER-related mortality ,HYSTERECTOMY ,COMPARATIVE studies ,SURGICAL excision ,LYMPH node surgery ,RESEARCH methodology ,MEDICAL cooperation ,METASTASIS ,PROGNOSIS ,RESEARCH ,ENDOMETRIAL tumors ,EVALUATION research ,RELATIVE medical risk ,TUMOR grading ,DIAGNOSIS - Abstract
Background: Our research aimed to investigate whether lymphadenectomy was required in patients with intermediate-risk endometrioid endometrial cancer (EEC).Methods: Between 1989 and 2015, 1009 patients with intermediate-risk EEC: grade 1 or 2 tumor, <50% myometrial invasion, and a tumor diameter ≥ 2 cm and 818 low-risk patients with grade 1 or 2 tumor, <50% myometrial invasion, and a tumor diameter < 2 cm were enrolled in this study. The rate and risk factors of node metastasis were evaluated and compared between the two risk groups. Survival data were analyzed in patients with intermediate-risk EEC with or without lymphadenectomy.Results: In all, 624 of 1009 (61.8%) patients with intermediate-risk EEC underwent pelvic ± para-aortic lymphadenectomy with a nodal metastasis rate of 1.9% (12/624), whereas 394 of 818 (48.2%) patients with low-risk EEC underwent pelvic ± para-aortic lymphadenectomy with a nodal metastasis rate of 0.3% (1/394) (p = 0.021). Notably, intermediate-risk EEC patients with a microcystic, elongated and fragmented (MELF) pattern of invasion, lymphatic vascular space invasion (LVSI), diffuse lesions, or lesions located in the cornua were more likely to have node metastasis. The 5-year overall cancer-related survival and the recurrence-free survival rates of the 742 intermediate-risk EEC patients who were followed for more than 3 years were 99.4% and 94.7%, respectively. In intermediate-risk group, 6 patients (6/443, 1.4%) with lymphadenectomy and 9 patients (9/299, 3.0%) without lymphadenectomy recurred, with a mean recurrence time of 38.3 and 18.7 months respectively. The five-year overall and recurrence-free survival rates of intermediate-risk patients with and without lymphadenectomy were similar (100% vs 98.9%, p = 0.351; 95.2% vs 93.3%, p = 0.464).Conclusion: Patients with intermediate-risk EEC have low nodal metastasis rate and a favorable outcome whether lymphadenectomy is performed or not. Omission of lymphadenectomy may be a reasonable option in the surgical management of patients with intermediate-risk EEC. [ABSTRACT FROM AUTHOR]- Published
- 2017
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18. A gestational choriocarcinoma of the ovary diagnosed by DNA polymorphic analysis: a case report and systematic review of the literature.
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Nan Jia, Yan Chen, Xiang Tao, Enzhi Ou, Xin Lu, and Weiwei Feng
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GERM cells ,HISTOLOGY ,AMENORRHEA - Abstract
Background: Choriocarcinoma of the ovary is rare. This tumor can arise from gestational tissue or pure germ cells of the ovary, the former results in gestational choriocarcinoma. The clinical characteristics and histology of both tumor types are identical, differentiation of these tumors is necessary for effective treatment. One strategy for the differentiation of these tumors types is to identify the presence of paternal DNA by DNA polymorphic analysis. Case presentation: In the present case, a 27-year-old patient with a history of amenorrhea, lower abdominal pain and vaginal bleeding received a laparoscopic dissection of cystic mass of the right ovary according to an initial diagnosis of ectopic pregnancy. Primary choriocarcinoma of the ovary was diagnosed by pathology, but its origin was uncertain. DNA polymorphic analysis was then performed and a gestational origin was confirmed. The patient subsequently exhibited an excellent response to chemotherapy, achieved complete remission and gave birth to a healthy baby. Conclusion: Differentiation between two etiologies of primary choriocarcinoma can be achieved with DNA polymorphic analysis and it is necessary to distinguish between them to approach to an appropriate treatment of a patient. [ABSTRACT FROM AUTHOR]
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- 2017
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19. High flavonoid accompanied with high starch accumulation triggered by nutrient starvation in bioenergy crop duckweed (Landoltia punctata).
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Xiang Tao, Yang Fang, Meng-Jun Huang, Yao Xiao, Yang Liu, Xin-Rong Ma, and Hai Zhao
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BIOMASS energy , *PORTULACA oleracea , *UNICONAZOLE , *INANITION (Health) , *PHENYLALANINE derivatives - Abstract
Background: As the fastest growing plant, duckweed can thrive on anthropogenic wastewater. The purple-backed duckweed, Landoltia punctata, is rich in starch and flavonoids. However, the molecular biological basis of high flavonoid and low lignin content remains largely unknown, as does the best method to combine nutrients removed from sewage and the utilization value improvement of duckweed biomass. Results: A combined omics study was performed to investigate the biosynthesis of flavonoid and the metabolic flux changes in L. punctata grown in different culture medium. Phenylalanine metabolism related transcripts were identified and carefully analyzed. Expression quantification results showed that most of the flavonoid biosynthetic transcripts were relatively highly expressed, while most lignin-related transcripts were poorly expressed or failed to be detected by iTRAQ based proteomic analyses. This explains why duckweed has a much lower lignin percentage and higher flavonoid content than most other plants. Growing in distilled water, expression of most flavonoid-related transcripts were increased, while most were decreased in uniconazole treated L. punctata (1/6 × Hoagland + 800 mg•L-1 uniconazole). When L. punctata was cultivated in full nutrient medium (1/6 × Hoagland), more than half of these transcripts were increased, however others were suppressed. Metabolome results showed that a total of 20 flavonoid compounds were separated by HPLC in L. punctata grown in uniconazole and full nutrient medium. The quantities of all 20 compounds were decreased by uniconazole, while 11 were increased and 6 decreased when grown in full nutrient medium. Nutrient starvation resulted in an obvious purple accumulation on the underside of each frond. Conclusions: The high flavonoid and low lignin content of L. punctata appears to be predominantly caused by the flavonoid-directed metabolic flux. Nutrient starvation is the best option to obtain high starch and flavonoid accumulation simultaneously in a short time for biofuels fermentation and natural products isolation. [ABSTRACT FROM AUTHOR]
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- 2017
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20. Genomic profiling of exogenous abscisic acid-responsive microRNAs in tomato (Solanum lycopersicum).
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Hai-Yang Cheng, Yan Wang, Xiang Tao, Yan-Fen Fan, Ya Dai, Hong Yang, and Xin-Rong Ma
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GENOMICS ,MICRORNA genetics ,PLANT populations ,ABSCISIC acid ,ABIOTIC stress - Abstract
Background: Plant microRNAs (miRNAs) are involved in various biological pathways and stress responses as negative regulators at the posttranscriptional level. Abscisic acid (ABA) is a key signaling molecule that mediates plant stress response by activating many stress-related genes. Although some miRNAs in plants are previously identified to respond to ABA, a comprehensive profile of ABA-responsive miRNAs has not yet been elucidated. Results: Here, we identified miRNAs responding to exogenous application of ABA, and their predicted target genes in the model plant organism tomato (Solanum lycopersicum). Deep sequencing of small RNAs from ABA-treated and untreated tomatoes revealed that miRNAs can be up- or down-regulated upon treatment with ABA. A total of 1067 miRNAs were detected (including 365 known and 702 candidate novel miRNAs), of those, 416 miRNAs which had an abundance over two TPM (transcripts per million) were selected for differential expression analysis. We identified 269 (180 known and 89 novel) miRNAs that respond to exogenous ABA treatment with a change in expression level of ∣log2FC∣≥0.25. 136 of these miRNAs (90 known and 46 novel) were expressed at significantly different levels ∣log2FC∣≥1 between treatments. Furthermore, stem-loop RT-PCR was applied to validate the RNA-seq data. Target prediction and analysis of the corresponding ABA-responsive transcriptome data uncovered that differentially expressed miRNAs are involved in condition stress and pathogen resistance, growth and development. Among them, approximately 90 miRNAs were predicted to target transcription factors and pathogen resistance genes. Some miRNAs had functional overlap in biotic and abiotic stress. Most of these miRNAs were down-regulated following exposure to exogenous ABA, while their related target genes were inversely up-regulated, which is consistent with their negative regulatory role in gene expression. Conclusions: Exogenous ABA application influences the composition and expression level of tomato miRNAs. ABA mainly down-regulates miRNAs that their target genes involve in abiotic stress adaption and disease resistance. ABA might increase expression of stress-related genes via miRNA-mediated posttranscriptional regulation, and our results indicate that ABA treatment has the potential to improve both abiotic stress tolerance and pathogen resistance. This study presents a comprehensive profile of ABA-regulated miRNAs in the tomato, and provides a robust database for further investigation of ABA regulatory mechanisms. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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21. Using proteomic analysis to investigate uniconazole-induced phytohormone variation and starch accumulation in duckweed (Landoltia punctata).
- Author
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Mengjun Huang, Yang Fang, Yang Liu, Yanling Jin, Jiaolong Sun, Xiang Tao, Xinrong Ma, Kaize He, and Hai Zhao
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DUCKWEEDS ,PROTEOMICS ,ETHANOL as fuel ,BIOSYNTHESIS ,ABSCISIC acid ,FEEDSTOCK - Abstract
Background: Duckweed ( ) has the potential to remediate wastewater and accumulate enormous Landoltia punctata amounts of starch for bioethanol production. Using systematical screening, we determined that the highest biomass and starch percentage of duckweed was obtained after uniconazole application. Uniconazole contributes to starch accumulation of duckweed, but the molecular mechanism is still unclear. Results: To elucidate the mechanisms of high starch accumulation, in the study, the responses of to L. punctata uniconazole were investigated using a quantitative proteomic approach combined with physiological and biochemical analysis. A total of 3327 proteins were identified. Among these identified proteins, a large number of enzymes involved in endogenous hormone synthetic and starch metabolic pathways were affected. Notably, most of the enzymes involved in abscisic acid (ABA) biosynthesis showed up-regulated expression, which was consistent with the content variation. The increased endogenous ABA may up-regulate expression of ADP-glucose pyrophosphorylase to promote starch biosynthesis. Importantly, the expression levels of several key enzymes in the starch biosynthetic pathway were up-regulated, which supported the enzymatic assay results and may explain why there is increased starch accumulation. Conclusions: These generated data linked uniconazole with changes in expression of enzymes involved in hormone biosynthesis and starch metabolic pathways and elucidated the effect of hormones on starch accumulation. Thus, this study not only provided insights into the molecular mechanisms of uniconazole-induced hormone variation and starch accumulation but also highlighted the potential for duckweed to be feedstock for biofuel as well as for sewage treatment. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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22. Uniconazole-induced starch accumulation in the bioenergy crop duckweed (Landoltia punctata) I: transcriptome analysis of the effects of uniconazole on chlorophyll and endogenous hormone biosynthesis.
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Yang Liu, Yang Fang, Mengjun Huang, Yanling Jin, Jiaolong Sun, Xiang Tao, Guohua Zhang, Kaize He, Yun Zhao, and Hai Zhao
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UNICONAZOLE ,STARCH ,ENERGY crops ,PORTULACA oleracea ,PLANT RNA ,PLANT hormone synthesis ,CHLOROPHYLL synthesis - Abstract
Background: Duckweed is a novel aquatic bioenergy crop that is found ubiquitously throughout the world. Uniconazole plays an important role in improving crop production through the regulation of endogenous hormone levels. We found that a high quantity and quality of duckweed growth can be achieved by uniconazole application, although the mechanisms are unknown. Results: The fronds of Landoltia punctata were sprayed evenly with 800 mg/L uniconazole. The dry weight following treatment increased by 10% compared to the controls at 240 h. Endogenous cytokinin (CK) and abscisic acid (ABA) content both increased compared to the control, while the level of gibberellins (GAs) decreased. Additionally, gene expression profiling results showed that the expression of transcripts encoding key enzymes involved in endogenous CK and ABA biosynthesis were up-regulated, while the transcripts of key enzymes for GAs biosynthesis were down-regulated. On the other hand, chlorophyll a and chlorophyll b contents were both increased compared with the control. Moreover, the net photosynthetic rate was elevated to 25.6 µmol CO
2 /m²/s compared with the control value of 22.05 µmol CO2 /m²/s. Importantly, the expression of some chlorophyll biosynthesis-related transcripts was up-regulated. Conclusion: Uniconazole treatment altered endogenous hormone levels and enhanced chlorophyll content and net photosynthetic rate in duckweed by regulating key enzymes involved in endogenous hormone and chlorophyll biosynthesis. The alterations of endogenous hormones and the increase of chlorophyll and photosynthetic rate data support the increase of biomass and starch accumulation. [ABSTRACT FROM AUTHOR]- Published
- 2015
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23. Uniconazole-induced starch accumulation in the bioenergy crop duckweed (Landoltia punctata) II: transcriptome alterations of pathways involved in carbohydrate metabolism and endogenous hormone crosstalk.
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Yang Liu, Yang Fang, Mengjun Huang, Yanling Jin, Jiaolong Sun, Xiang Tao, Guohua Zhang, Kaize He, Yun Zhao, and Hai Zhao
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UNICONAZOLE ,STARCH ,ENERGY crops ,PORTULACA oleracea ,PLANT RNA ,CARBOHYDRATE metabolism ,PLANT hormones - Abstract
Background: Landoltia punctata is a widely distributed duckweed species with great potential to accumulate enormous amounts of starch for bioethanol production. We found that L. punctata can accumulate starch rapidly accompanied by alterations in endogenous hormone levels after uniconazole application, but the relationship between endogenous hormones and starch accumulation is still unclear. Results: After spraying fronds with 800 mg/L uniconazole, L. punctata can accumulate starch quickly, with a dry weight starch content of up to 48% after 240 h of growth compared to 15.7% in the control group. Electron microscopy showed that the starch granule content was elevated after uniconazole application. The activities of key enzymes involved in starch synthesis were also significantly increased. Moreover, the expression of regulatory elements of the cytokinin (CK), abscisic acid (ABA) and gibberellin (GA) signaling pathways that are involved in chlorophyll and starch metabolism also changed correspondingly. Importantly, the expression levels of key enzymes involved in starch biosynthesis were up-regulated, while transcript-encoding enzymes involved in starch degradation and other carbohydrate metabolic branches were down-regulated. Conclusion: The increase of endogenous ABA and CK levels positively promoted the activity of ADP-glucose pyrophosphorylase (AGPase) and chlorophyll content, while the decrease in endogenous GA levels inactivated a-amylase. Thus, the alterations of endogenous hormone levels resulted in starch accumulation due to regulation of the expression of genes involved in the starch metabolism pathway. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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24. Evaluating team-based, lecture-based, and hybrid learning methods for neurology clerkship in China: a method-comparison study.
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Lian-Hong Yang, Long-Yuan Jiang, Bing Xu, Shu-Qiong Liu, Yan-Ran Liang, Jin-Hao Ye, and En-Xiang Tao
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NEUROLOGY ,CLINICAL clerkship ,PROBLEM solving ,MEDICAL students ,TEST scoring ,INTERNAL medicine - Abstract
Background Neurology is complex, abstract, and difficult for students to learn. However, a good learning method for neurology clerkship training is required to help students quickly develop strong clinical thinking as well as problem-solving skills. Both the traditional lecture-based learning (LBL) and the relatively new team-based learning (TBL) methods have inherent strengths and weaknesses when applied to neurology clerkship education. However, the strengths of each method may complement the weaknesses of the other. Combining TBL with LBL may produce better learning outcomes than TBL or LBL alone. We propose a hybrid method (TBL + LBL) and designed an experiment to compare the learning outcomes with those of pure LBL and pure TBL. Methods One hundred twenty-seven fourth-year medical students attended a two-week neurology clerkship program organized by the Department of Neurology, Sun Yat-Sen Memorial Hospital. All of the students were from Grade 2007, Department of Clinical Medicine, Zhongshan School of Medicine, Sun Yat-Sen University. These students were assigned to one of three groups randomly: Group A (TBL + LBL, with 41 students), Group B (LBL, with 43 students), and Group C (TBL, with 43 students). The learning outcomes were evaluated by a questionnaire and two tests covering basic knowledge of neurology and clinical practice. Results The practice test scores of Group A were similar to those of Group B, but significantly higher than those of Group C. The theoretical test scores and the total scores of Group A were significantly higher than those of Groups B and C. In addition, 100% of the students in Group A were satisfied with the combination of TBL + LBL. Conclusions Our results support our proposal that the combination of TBL + LBL is acceptable to students and produces better learning outcomes than either method alone in neurology clerkships. In addition, the proposed hybrid method may also be suited for other medical clerkships that require students to absorb a large amount of abstract and complex course materials in a short period, such as pediatrics and internal medicine clerkships. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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25. Comparative transcriptome analysis of tomato (Solanum lycopersicum) in response to exogenous abscisic acid.
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Yan Wang, Xiang Tao, Xiao-Mei Tang, Liang Xiao, Jiao-long Sun, Xue-Feng Yan, Dan Li, Hong-Yuan Deng, and Xin-Rong Ma
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TOMATO research , *ABSCISIC acid , *GENETIC regulation in plants , *GENE expression in plants , *NUCLEOTIDE sequence , *TRANSCRIPTION factors - Abstract
Background Abscisic acid (ABA) can regulate the expressions of many stress-responsive genes in plants. However, in defense responses to pathogens, mounting evidence suggests that ABA plays variable roles. Little information exists about genome-wide gene expression in ABA responses in tomato (Solanum lycopersicum L.), a model fruit crop plant. Results Global transcriptome profiles of tomato leaf responses to exogenous ABA were generated using Illumina RNA-sequencing. More than 173 million base pair reads were mapped onto the tomato reference genome and the expression pattern differences between treated and control leaves were assessed. In total, 50,616 transcripts were generated. Among them, 42,583 were functionally annotated in the NCBI non-redundant database and 47,877 in the tomato genome reference. Additionally, 31,107 transcripts were categorized into 57 functional groups based on Gene Ontology terms, and 14,371 were assigned to 310 Kyoto Encyclopedia of Genes and Genomes pathways. In both the ABA treatment and control samples, 39,671 transcripts were available to analyze their expressions, of which 21,712 (54.73%) responded to exogenous ABA. Of these transcripts, 2,787 were significantly differently expressed genes (DEGs). Many known and novel ABA-induced and -repressed genes were found. Exogenous ABA can influence the ABA signaling pathway with PYR/PYL/RCARs-PP2Cs-SnRK2s as the center. Eighteen PYL genes were detected. A large number of genes related to various transcription factors, heat shock proteins, pathogen resistance, and the salicylic acid, jasmonic acid, and ethylene signaling pathways were upregulated by exogenous ABA. Conclusions The results indicated that ABA has the potential to improve pathogen-resistance and abiotic stress tolerance in tomato. This study presents the global expression analysis of ABAregulated transcripts in tomato and provides a robust database for investigating the functions of genes induced by ABA. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
- View/download PDF
26. Benign and malignant ovarian steroid cell tumors, not otherwise specified: case studies, comparison, and review of the literature.
- Author
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Wei Jiang, Xiang Tao, Fang Fang, Shaofen Zhang, and Congjian Xu
- Subjects
- *
STEROIDS , *LAPAROSCOPY , *CYSTECTOMY , *LUTEINIZING hormone , *HORMONES , *VIRILISM - Abstract
Ovarian steroid cell tumors, not otherwise specified (NOS) are rare sex cord-stromal tumors of the ovary with malignant potential. So far only a few cases were reported in English literature through the Pubmed search. Here we report two cases of such tumor, one was benign (first case underwent laparoscopic cystectomy) and the other was malignant (died 10 months later after initial diagnosis), both presented with amenorrhea and clinical signs or symptoms of virilization. In malignant case, we provided evidence (tumor embolus) in addition to the reported five characteristics associated with malignancy. On further evaluation, laboratory investigations revealed hyperandrogenism in the male range, while follicle stimulating hormone (FSH) and luteinising hormone (LH) levels were within normal limits. Various aspects of the presentation, diagnosis, and treatment of these tumors are discussed. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
- View/download PDF
27. Comparative transcriptome analysis to investigate the high starch accumulation of duckweed (Landoltia punctata) under nutrient starvation.
- Author
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Xiang Tao, Yang Fang, Yao Xiao, Yan-ling Jin, Xin-rong Ma, Yun Zhao, Kai-ze He, Hai Zhao, and Hai-yan Wang
- Subjects
- *
BIOMASS production , *DUCKWEEDS , *SEWAGE , *NUCLEIC acids , *GASES from plants , *GENE expression , *LEAVENING agents - Abstract
Background: Duckweed can thrive on anthropogenic wastewater and produce tremendous biomass production. Due to its relatively high starch and low lignin percentage, duckweed is a good candidate for bioethanol fermentation. Previous studies have observed that water devoid of nutrients is good for starch accumulation, but its molecular mechanism remains unrevealed. Results: This study globally analyzed the response to nutrient starvation in order to investigate the starch accumulation in duckweed (Landoltia punctata). L. punctata was transferred from nutrient-rich solution to distilled water and sampled at different time points. Physiological measurements demonstrated that the activity of ADP-glucose pyrophosphorylase, the key enzyme of starch synthesis, as well as the starch percentage in duckweed, increased continuously under nutrient starvation. Samples collected at 0 h, 2 h and 24 h time points respectively were used for comparative gene expression analysis using RNA-Seq. A comprehensive transcriptome, comprising of 74,797 contigs, was constructed by a de novo assembly of the RNA-Seq reads. Gene expression profiling results showed that the expression of some transcripts encoding key enzymes involved in starch biosynthesis was up-regulated, while the expression of transcripts encoding enzymes involved in starch consumption were down-regulated, the expression of some photosynthesis-related transcripts were down-regulated during the first 24 h, and the expression of some transporter transcripts were up-regulated within the first 2 h. Very interestingly, most transcripts encoding key enzymes involved in flavonoid biosynthesis were highly expressed regardless of starvation, while transcripts encoding laccase, the last rate-limiting enzyme of lignifications, exhibited very low expression abundance in all three samples. Conclusion: Our study provides a comprehensive expression profiling of L. punctata under nutrient starvation, which indicates that nutrient starvation down-regulated the global metabolic status, redirects metabolic flux of fixed CO2 into starch synthesis branch resulting in starch accumulation in L. punctata. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
- View/download PDF
28. Immunization of mice by Hollow Mesoporous Silica Nanoparticles as carriers of Porcine Circovirus Type 2 ORF2 Protein.
- Author
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Hui-Chen Guo, Xiao-Ming Feng, Shi-Qi Sun, Yan-Quan Wei, De-Hui Sun, Xiang-Tao Liu, Zai-Xin Liu, Jian-Xiong Luo, and Hong Yin
- Subjects
PORCINE reproductive & respiratory syndrome ,ENZYME-linked immunosorbent assay ,LYMPHOID tissue ,IMMUNE response ,VACCINES - Abstract
Background: Porcine circovirus type 2 (PCV2) is a primary etiological agent of post-weaning multi-systemic wasting syndrome (PMWS), which is a disease of increasing importance to the pig industry worldwide. Hollow mesoporous silica nanoparticles (HMSNs) have gained increasing interest for use in vaccines. Methods: To study the potential of HMSNs for use as a protein delivery system or vaccine carriers. HMSNs were synthesized by a sol–gel/emulsion(oil-in-water/ethanol) method, purified PCV2 GST-ORF2-E protein was loaded into HMSNs, and the resulting HMSN/protein mixture was injected into mice. The uptake and release profiles of protein by HMSNs in vitro were investigated. PCV2 GST-ORF2-E specific antibodies and secretion of IFN-γ were detected by enzyme-linked immunosorbent assays, spleen lymphocyte proliferation was measured by the MTS method, and the percentage of CD4+ and CD8+ were determined by flow cytometry. Results: HMSNs were found to yield better binding capacities and delivery profiles of proteins; the specific immune response induced by PCV2 GST-ORF2-E was maintained for a relatively long period of time after immunization with the HMSN/protein complex. Conclusion: The findings suggest that HMSNs are good protein carriers and have high potential for use in future applications in therapeutic drug delivery. [ABSTRACT FROM AUTHOR]
- Published
- 2012
- Full Text
- View/download PDF
29. Development and validation of a prokaryotically expressed foot-and-mouth disease virus nonstructural protein 2C'3AB-based immunochromatographic strip to differentiate between infected and vaccinated animals.
- Author
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Lei Wu, Tao Jiang, Zeng-Jun Lu, Ya-Min Yang, Pu Sun, Zhong Liang, Dong Li, Yuan-Fang Fu, Yi-Mei Cao,, Xiang-Tao Liu, and Zai-Xin Liu
- Subjects
FOOT & mouth disease ,VETERINARY virology ,PICORNAVIRUS infections ,PROKARYOTES ,CHROMATOGRAPHIC analysis - Abstract
Background: Foot-and-mouth disease (FMD) is an extremely contagious viral disease of cattle, pigs, sheep, goats, and many cloven-hoofed wild animals. FMDV serotypes O and Asia 1 have circulated separately in China during the last fifty years, and eliminating infected animals and vaccination are the main policies to prevent and control FMD. Antibodies to NSPs exist in infected animals, and were utilized to differentiate between infected and vaccinated animals. The reliability of detection of 3AB or 3ABC antibodies is higher than that of other NSPs. The test of 3AB is still credible because 3C protein's immunogenicity is the weakest. The 2C protein, immediately Nterminal of 3AB, was used to differentiate between infected and vaccinated animals. The use of the immunochromatographic strip is facile for clinical laboratories lacking specialized equipment and for rapid field diagnosis. Results: In this study, an immunochromatographic strip with non-structural protein (NSP) 2C'3AB was developed and validated to differentiate foot-and-mouth disease infected from vaccinated animals. A part of N-terminal of 2C protein gene and whole 3AB gene were connected and prokaryotically expressed as the antigens labeled with colloidal gold was used as the detector, the 2C'3AB protein and rabbits anti-2C'3AB antibodies were blotted on the nitrocellulose(NC) membrane for the test and control lines, respectively. 387 serum samples were collected to evaluate the characteristics of the strip in comparison with existing commercial 3ABC antibody ELISA kit. The coincidence rate of pigs negative serum, pigs vaccinated serum, pigs infected serum was 100%, 97.2%, 95.0%, respectively. The coincidence rate of cattle negative serum, cattle vaccinated serum, cattle infected serum was 100%, 96.7%, 98.0%, respectively. The coincidence rate of sheep negative serum, sheep infected serum was 97.6%, 96.3%, respectively. The strip was shown to be of high specificity and sensitivity, good repeatability and stability. Conclusion: These data suggest that the immunochromatographic strip is a useful tool for rapid on-site diagnosing animals infected foot-and-mouth disease virus. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
30. Development and validation of an ELISA using a protein encoded by ORF2 antigenic domain of porcine circovirus type 2.
- Author
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Shi-Qi Sun, Hui-Chen Guo, De-Hui Sun, Shuang-Hui Yin, You-Jun Shang, Xue-Peng Cai, and Xiang-Tao Liu
- Subjects
CYTOSKELETAL proteins ,PROTEINS ,SERUM ,CIRCOVIRUSES ,IMMUNOGLOBULINS ,INFECTION - Abstract
Background: The capsid protein (ORF2) is a major structural protein of porcine circovirus type 2 (PCV2). A simple and reliable diagnostic method based on ORF2 protein immunoreactivity would serve as a valuable diagnostic method for detecting serum antibodies to PCV2 and monitoring PCV infection. Here, we reported an indirect enzyme-linked immunosorbent assay (I-ELISA) by using an antigenic domain (113-147AA) of ORF2-encoded antigen, expressed in E. coli, for diagnosis of PCV infection. Results: The ELISA was performed on 288 serum samples collected from different porcine herds and compared with an indirect immunofluorescent assay (IFA). In total, 262 of 288 samples were positive as indicated by both IELISA and IFA. The specificity and sensitivity of I-ELISA were 87.7% and 93.57%. Conclusions: This ELISA is suitable for detection and discrimination of PCV2 infection in both SPF and farm antisera. [ABSTRACT FROM AUTHOR]
- Published
- 2010
- Full Text
- View/download PDF
31. The development of a rapid SYBR one step real-time RT-PCR for detection of porcine reproductive and respiratory syndrome virus.
- Author
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Hong Tian, Jing Yan Wu, You Jun Shang, Yan Cheng, and Xiang Tao Liu
- Subjects
PORCINE reproductive & respiratory syndrome ,RNA ,VIRUS diseases in swine ,CLASSICAL swine fever ,VESICULAR exanthema of swine - Abstract
Background: Prompt detection of PRRSV in the field samples is important for effective PRRS control, thereby reducing the potentially serious economic damage which can result from an outbreak. In this study, a rapid SYBR-based, one step real-time RT-PCR quantitative reverse transcription PCR (qRT-PCR) has been developed for the detection of porcine reproductive and respiratory syndrome virus (PRRSV). Primers were designed based on the sequence of highly conservative region of PRRSV N gene. Results: The sensitivity of the real-time qRT-PCR assay was achieved through PRRSV ch-1a RNA for the generation of a standard curve. The detection limit of the assay was found to be 9.6 RNA copies per reaction mixture. This assay had excellent intra- and inter-assay reproducibility as in total 65 field samples were screened for the presence of PRRSV by conventional RT-PCR in parallel with qRT-PCR, and the detection rate increased from 60.0% to 76.9%. Moreover, the specificity result indicated that this assay could reliably differentiate PRRSV from the other swine viral diseases, such as classical swine fever virus (CSFV), swine vesicular disease virus (SVDV) and vesicular exanthema of swine virus (VESV). Conclusion: The real-time qRT-PCR assay described in this report allows the rapid, specific and sensitive laboratory detection of PRRSV in field samples. [ABSTRACT FROM AUTHOR]
- Published
- 2010
- Full Text
- View/download PDF
32. Primary extraskeletal osteosarcoma of omentum majus.
- Author
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Shui-Xiang Tao, Guo-Qin Tian, Meng-Hua Ge, and Cheng-Long Fan
- Subjects
- *
OSTEOSARCOMA , *BONE cancer , *SARCOMA , *LIVER cancer , *MEDICAL radiology , *DRUG therapy , *SURGICAL excision , *ULTRASONIC imaging - Abstract
Extraskeletal osteosarcoma is a rare malignant soft tissue tumor. Here we present a case of a primary extraskeletal osteosarcoma arising from omentum majus in a 40-year-old Chinese woman. Ultrasonography of the pelvic cavity showed a large soft tissue mass with marked calcification. Complete surgical resection of the primary tumor was performed and the histopathological diagnosis was extraskeletal osteosarcoma of omentum majus. She was followed up without adjuvant radiotherapy and chemotherapy, and died from widespread intra-abdominal, lung and liver metastases 7 months postoperatively. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
33. Leukemoid reaction in cervical cancer: a case report and review of the literature.
- Author
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Qing, Li, Xiang, Tao, Guofu, Zhang, and Weiwei, Feng
- Abstract
Background: The presentation of a leukemoid reaction in cervical cancers is rare. A leukemoid reaction is defined as leukocytosis associated with a cause outside the bone marrow, with the white blood cell count (WBC) exceeding 50*109/L. Two cervical cancers presenting with leukemoid reactions were previously reported. However, the cancers in these cases were mainly in the advanced stages and had a poor outcome.Case Presentation: Here we report a 40-year old patient with clinical stage (FIGO IIA1) cervical squamous carcinoma suffering from vaginal cuff recurrence with a leukemoid reaction two months after laparoscopic radical hysterectomy. The patient suffered from persistent fever and leukocytosis after one month of antibiotic treatment accompanied by rapid growth of the vaginal mass indicated that the leukocytosis could not be caused only by infection. After paclitaxel injection, the WBC count increased to 70.37*109/L. Bone marrow aspirates and biopsy showed left-shift neutrophilia, which confirmed leukemoid reaction. After two courses of paclitaxel and cisplatin treatment, the white blood cell counts decreased to normal, the fever disappeared, and the vaginal mass was reduced dramatically. She achieved completed remission after subsequent chemo-radiation and two additional courses of chemotherapy.Conclusion: In our case, leukemoid reaction was related to recurrent cervical carcinoma and sensitive to chemotherapy. To our knowledge, this is the third case to be reported in the literature. Furthermore, this is the only case described that shows an unequivocal correlation between tumor response and leukemoid reaction. [ABSTRACT FROM AUTHOR]- Published
- 2014
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34. Genomic evaluation by including dominance effects and inbreeding depression for purebred and crossbred performance with an application in pigs.
- Author
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Xiang T, Christensen OF, Vitezica ZG, and Legarra A
- Subjects
- Alleles, Animals, Female, Genetic Markers, Inheritance Patterns genetics, Male, Reproducibility of Results, Breeding, Crosses, Genetic, Genes, Dominant, Genomics methods, Inbreeding Depression genetics, Sus scrofa genetics
- Abstract
Background: Improved performance of crossbred animals is partly due to heterosis. One of the major genetic bases of heterosis is dominance, but it is seldom used in pedigree-based genetic evaluation of livestock. Recently, a trivariate genomic best linear unbiased prediction (GBLUP) model including dominance was developed, which can distinguish purebreds from crossbred animals explicitly. The objectives of this study were: (1) methodological, to show that inclusion of marker-based inbreeding accounts for directional dominance and inbreeding depression in purebred and crossbred animals, to revisit variance components of additive and dominance genetic effects using this model, and to develop marker-based estimators of genetic correlations between purebred and crossbred animals and of correlations of allele substitution effects between breeds; (2) to evaluate the impact of accounting for dominance effects and inbreeding depression on predictive ability for total number of piglets born (TNB) in a pig dataset composed of two purebred populations and their crossbreds. We also developed an equivalent model that makes the estimation of variance components tractable., Results: For TNB in Danish Landrace and Yorkshire populations and their reciprocal crosses, the estimated proportions of dominance genetic variance to additive genetic variance ranged from 5 to 11%. Genetic correlations between breeding values for purebred and crossbred performances for TNB ranged from 0.79 to 0.95 for Landrace and from 0.43 to 0.54 for Yorkshire across models. The estimated correlation of allele substitution effects between Landrace and Yorkshire was low for purebred performances, but high for crossbred performances. Predictive ability for crossbred animals was similar with or without dominance. The inbreeding depression effect increased predictive ability and the estimated inbreeding depression parameter was more negative for Landrace than for Yorkshire animals and was in between for crossbred animals., Conclusions: Methodological developments led to closed-form estimators of inbreeding depression, variance components and correlations that can be easily interpreted in a quantitative genetics context. Our results confirm that genetic correlations of breeding values between purebred and crossbred performances within breed are positive and moderate. Inclusion of dominance in the GBLUP model does not improve predictive ability for crossbred animals, whereas inclusion of inbreeding depression does.
- Published
- 2016
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- View/download PDF
35. Imputation of genotypes in Danish purebred and two-way crossbred pigs using low-density panels.
- Author
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Xiang T, Ma P, Ostersen T, Legarra A, and Christensen OF
- Subjects
- Animals, Inbreeding, Linkage Disequilibrium, Models, Genetic, Polymorphism, Single Nucleotide, Population Density, Selection, Genetic, Software, Genotype, Swine genetics
- Abstract
Background: Genotype imputation is commonly used as an initial step in genomic selection since the accuracy of genomic selection does not decline if accurately imputed genotypes are used instead of actual genotypes but for a lower cost. Performance of imputation has rarely been investigated in crossbred animals and, in particular, in pigs. The extent and pattern of linkage disequilibrium differ in crossbred versus purebred animals, which may impact the performance of imputation. In this study, first we compared different scenarios of imputation from 5 K to 8 K single nucleotide polymorphisms (SNPs) in genotyped Danish Landrace and Yorkshire and crossbred Landrace-Yorkshire datasets and, second, we compared imputation from 8 K to 60 K SNPs in genotyped purebred and simulated crossbred datasets. All imputations were done using software Beagle version 3.3.2. Then, we investigated the reasons that could explain the differences observed., Results: Genotype imputation performs as well in crossbred animals as in purebred animals when both parental breeds are included in the reference population. When the size of the reference population is very large, it is not necessary to use a reference population that combines the two breeds to impute the genotypes of purebred animals because a within-breed reference population can provide a very high level of imputation accuracy (correct rate ≥ 0.99, correlation ≥ 0.95). However, to ensure that similar imputation accuracies are obtained for crossbred animals, a reference population that combines both parental purebred animals is required. Imputation accuracies are higher when a larger proportion of haplotypes are shared between the reference population and the validation (imputed) populations., Conclusions: The results from both real data and pedigree-based simulated data demonstrate that genotype imputation from low-density panels to medium-density panels is highly accurate in both purebred and crossbred pigs. In crossbred pigs, combining the parental purebred animals in the reference population is necessary to obtain high imputation accuracy.
- Published
- 2015
- Full Text
- View/download PDF
36. Foot-and-mouth disease virus-like particles produced by a SUMO fusion protein system in Escherichia coli induce potent protective immune responses in guinea pigs, swine and cattle.
- Author
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Guo HC, Sun SQ, Jin Y, Yang SL, Wei YQ, Sun DH, Yin SH, Ma JW, Liu ZX, Guo JH, Luo JX, Yin H, Liu XT, and Liu DX
- Subjects
- Animals, Capsid Proteins immunology, Escherichia coli, Escherichia coli Proteins metabolism, Foot-and-Mouth Disease virology, SUMO-1 Protein metabolism, Vaccines, Virus-Like Particle administration & dosage, Viral Vaccines administration & dosage, Cattle immunology, Foot-and-Mouth Disease immunology, Foot-and-Mouth Disease Virus immunology, Guinea Pigs immunology, Swine immunology, Vaccines, Virus-Like Particle immunology, Viral Vaccines immunology
- Abstract
Foot-and-mouth disease virus (FMDV) causes a highly contagious infection in cloven-hoofed animals. The format of FMD virus-like particles (VLP) as a non-replicating particulate vaccine candidate is a promising alternative to conventional inactivated FMDV vaccines. In this study, we explored a prokaryotic system to express and assemble the FMD VLP and validated the potential of VLP as an FMDV vaccine candidate. VLP composed entirely of FMDV (Asia1/Jiangsu/China/2005) capsid proteins (VP0, VP1 and VP3) were simultaneously produced as SUMO fusion proteins by an improved SUMO fusion protein system in E. coli. Proteolytic removal of the SUMO moiety from the fusion proteins resulted in the assembly of VLP with size and shape resembling the authentic FMDV. Immunization of guinea pigs, swine and cattle with FMD VLP by intramuscular inoculation stimulated the FMDV-specific antibody response, neutralizing antibody response, T-cell proliferation response and secretion of cytokine IFN-γ. In addition, immunization with one dose of the VLP resulted in complete protection of these animals from homologous FMDV challenge. The 50% protection dose (PD50) of FMD VLP in cattle is up to 6.34. These results suggest that FMD VLP expressed in E. coli are an effective vaccine in guinea pigs, swine and cattle and support further development of these VLP as a vaccine candidate for protection against FMDV.
- Published
- 2013
- Full Text
- View/download PDF
37. Immunization of mice by hollow mesoporous silica nanoparticles as carriers of porcine circovirus type 2 ORF2 protein.
- Author
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Guo HC, Feng XM, Sun SQ, Wei YQ, Sun DH, Liu XT, Liu ZX, Luo JX, and Yin H
- Subjects
- Animals, Antibodies, Viral blood, CD4-Positive T-Lymphocytes immunology, CD8-Positive T-Lymphocytes immunology, Cell Proliferation, Interferon-gamma metabolism, Mice, Spleen immunology, Viral Vaccines administration & dosage, Circovirus immunology, Drug Carriers administration & dosage, Nanoparticles administration & dosage, Silicon Dioxide administration & dosage, Vaccination methods, Viral Proteins immunology, Viral Vaccines immunology
- Abstract
Background: Porcine circovirus type 2 (PCV2) is a primary etiological agent of post-weaning multi-systemic wasting syndrome (PMWS), which is a disease of increasing importance to the pig industry worldwide. Hollow mesoporous silica nanoparticles (HMSNs) have gained increasing interest for use in vaccines., Methods: To study the potential of HMSNs for use as a protein delivery system or vaccine carriers. HMSNs were synthesized by a sol-gel/emulsion(oil-in-water/ethanol) method, purified PCV2 GST-ORF2-E protein was loaded into HMSNs, and the resulting HMSN/protein mixture was injected into mice. The uptake and release profiles of protein by HMSNs in vitro were investigated. PCV2 GST-ORF2-E specific antibodies and secretion of IFN-γ were detected by enzyme-linked immunosorbent assays, spleen lymphocyte proliferation was measured by the MTS method, and the percentage of CD4+ and CD8+ were determined by flow cytometry., Results: HMSNs were found to yield better binding capacities and delivery profiles of proteins; the specific immune response induced by PCV2 GST-ORF2-E was maintained for a relatively long period of time after immunization with the HMSN/protein complex., Conclusion: The findings suggest that HMSNs are good protein carriers and have high potential for use in future applications in therapeutic drug delivery.
- Published
- 2012
- Full Text
- View/download PDF
38. Detection of foot-and-mouth disease virus RNA by reverse transcription loop-mediated isothermal amplification.
- Author
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Chen HT, Zhang J, Liu YS, and Liu XT
- Subjects
- Animals, Cross Reactions, Foot-and-Mouth Disease virology, Foot-and-Mouth Disease Virus genetics, RNA, Viral genetics, Sensitivity and Specificity, Temperature, Time Factors, Veterinary Medicine methods, Foot-and-Mouth Disease diagnosis, Foot-and-Mouth Disease Virus isolation & purification, Molecular Diagnostic Techniques methods, Nucleic Acid Amplification Techniques methods, RNA, Viral isolation & purification, Virology methods
- Abstract
A reverse transcription loop-mediated isothermal amplification (RT-LAMP) assay was developed for foot-and-mouth disease virus (FMDV) RNA. The amplification was able to finish in 45 min under isothermal condition at 64°C by employing a set of four primers targeting FMDV 2B. The assay showed higher sensitivity than RT-PCR. No cross reactivity was observed from other RNA viruses including classical swine fever virus, swine vesicular disease, porcine reproductive and respiratory syndrome virus, Japanese encephalitis virus. Furthermore, the assay correctly detected 84 FMDV positive samples but not 65 FMDV negative specimens. The result indicated the potential usefulness of the technique as a simple and rapid procedure for the detection of FMDV infection.
- Published
- 2011
- Full Text
- View/download PDF
39. Rapid typing of foot-and-mouth disease serotype Asia 1 by reverse transcription loop-mediated isothermal amplification.
- Author
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Chen HT, Zhang J, Liu YS, and Liu XT
- Subjects
- Animals, RNA, Viral genetics, Reverse Transcription, Sensitivity and Specificity, Temperature, Time Factors, Foot-and-Mouth Disease diagnosis, Foot-and-Mouth Disease virology, Foot-and-Mouth Disease Virus classification, Foot-and-Mouth Disease Virus isolation & purification, Molecular Diagnostic Techniques methods, Molecular Typing methods, Nucleic Acid Amplification Techniques methods
- Abstract
A reverse transcriptase loop-mediated isothermal amplification (RT-LAMP) assay was rapidly used to detect serotype Asia 1 of foot-and-mouth disease virus (FMDV) within 45 min at 61°C. All FMDV serotype Asia 1 reference strains were positive by RT-LAMP, while other viruses such as FMDV serotypes O, C, A and classical swine fever virus, swine vesicular disease virus, porcine reproductive and respiratory syndrome virus and Japanese encephalitis virus remained negative. Furthermore, FMDV sreotype Asia 1 positive samples were able to detect by RT-LAMP assay. This RT-LAMP assay may be suitable particularly for diagnosis of FMDV serotype Asia 1 infection in field stations.
- Published
- 2011
- Full Text
- View/download PDF
40. Development and validation of a prokaryotically expressed foot-and-mouth disease virus non-structural protein 2C'3AB-based immunochromatographic strip to differentiate between infected and vaccinated animals.
- Author
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Wu L, Jiang T, Lu ZJ, Yang YM, Sun P, Liang Z, Li D, Fu YF, Cao YM, Liu XT, and Liu ZX
- Subjects
- Animals, Antibodies, Viral immunology, Cattle, Foot-and-Mouth Disease prevention & control, Foot-and-Mouth Disease virology, Foot-and-Mouth Disease Virus genetics, Gene Expression, Immunoassay instrumentation, Rabbits, Reagent Strips, Sheep, Swine, Vaccination, Viral Nonstructural Proteins analysis, Viral Nonstructural Proteins genetics, Antibodies, Viral analysis, Foot-and-Mouth Disease diagnosis, Foot-and-Mouth Disease immunology, Foot-and-Mouth Disease Virus immunology, Immunoassay methods, Viral Nonstructural Proteins immunology
- Abstract
Background: Foot-and-mouth disease (FMD) is an extremely contagious viral disease of cattle, pigs, sheep, goats, and many cloven-hoofed wild animals. FMDV serotypes O and Asia 1 have circulated separately in China during the last fifty years, and eliminating infected animals and vaccination are the main policies to prevent and control FMD. Antibodies to NSPs exist in infected animals, and were utilized to differentiate between infected and vaccinated animals. The reliability of detection of 3AB or 3ABC antibodies is higher than that of other NSPs. The test of 3AB is still credible because 3C protein's immunogenicity is the weakest. The 2C protein, immediately N-terminal of 3AB, was used to differentiate between infected and vaccinated animals. The use of the immunochromatographic strip is facile for clinical laboratories lacking specialized equipment and for rapid field diagnosis., Results: In this study, an immunochromatographic strip with non-structural protein (NSP) 2C'3AB was developed and validated to differentiate foot-and-mouth disease infected from vaccinated animals. A part of N-terminal of 2C protein gene and whole 3AB gene were connected and prokaryotically expressed as the antigens labeled with colloidal gold was used as the detector, the 2C'3AB protein and rabbits anti-2C'3AB antibodies were blotted on the nitrocellulose(NC) membrane for the test and control lines, respectively. 387 serum samples were collected to evaluate the characteristics of the strip in comparison with existing commercial 3ABC antibody ELISA kit. The coincidence rate of pigs negative serum, pigs vaccinated serum, pigs infected serum was 100%, 97.2%, 95.0%, respectively. The coincidence rate of cattle negative serum, cattle vaccinated serum, cattle infected serum was 100%, 96.7%, 98.0%, respectively. The coincidence rate of sheep negative serum, sheep infected serum was 97.6%, 96.3%, respectively. The strip was shown to be of high specificity and sensitivity, good repeatability and stability., Conclusion: These data suggest that the immunochromatographic strip is a useful tool for rapid on-site diagnosing animals infected foot-and-mouth disease virus.
- Published
- 2011
- Full Text
- View/download PDF
41. Development and validation of an ELISA using a protein encoded by ORF2 antigenic domain of porcine circovirus type 2.
- Author
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Sun SQ, Guo HC, Sun DH, Yin SH, Shang YJ, Cai XP, and Liu XT
- Subjects
- Animals, Circoviridae Infections diagnosis, Circovirus immunology, Enzyme-Linked Immunosorbent Assay methods, Escherichia coli genetics, Recombinant Proteins, Sensitivity and Specificity, Swine, Swine Diseases virology, Antibodies, Viral blood, Antigens, Viral, Capsid Proteins, Circoviridae Infections veterinary, Circovirus isolation & purification, Swine Diseases diagnosis, Virology methods
- Abstract
Background: The capsid protein (ORF2) is a major structural protein of porcine circovirus type 2 (PCV2). A simple and reliable diagnostic method based on ORF2 protein immunoreactivity would serve as a valuable diagnostic method for detecting serum antibodies to PCV2 and monitoring PCV infection. Here, we reported an indirect enzyme-linked immunosorbent assay (I-ELISA) by using an antigenic domain (113-147AA) of ORF2-encoded antigen, expressed in E. coli, for diagnosis of PCV infection., Results: The ELISA was performed on 288 serum samples collected from different porcine herds and compared with an indirect immunofluorescent assay (IFA). In total, 262 of 288 samples were positive as indicated by both I-ELISA and IFA. The specificity and sensitivity of I-ELISA were 87.7% and 93.57%., Conclusions: This ELISA is suitable for detection and discrimination of PCV2 infection in both SPF and farm antisera.
- Published
- 2010
- Full Text
- View/download PDF
42. Rational mutagenesis to support structure-based drug design: MAPKAP kinase 2 as a case study.
- Author
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Argiriadi MA, Sousa S, Banach D, Marcotte D, Xiang T, Tomlinson MJ, Demers M, Harris C, Kwak S, Hardman J, Pietras M, Quinn L, DiMauro J, Ni B, Mankovich J, Borhani DW, Talanian RV, and Sadhukhan R
- Subjects
- Amino Acid Substitution, Computer Simulation, Crystallization, Crystallography, X-Ray, Humans, Intracellular Signaling Peptides and Proteins genetics, Isoenzymes biosynthesis, Isoenzymes chemistry, Isoenzymes isolation & purification, Protein Conformation, Protein Serine-Threonine Kinases biosynthesis, Protein Serine-Threonine Kinases genetics, Drug Design, Intracellular Signaling Peptides and Proteins chemistry, Mutagenesis, Site-Directed, Protein Kinase Inhibitors chemistry, Protein Serine-Threonine Kinases chemistry
- Abstract
Background: Structure-based drug design (SBDD) can provide valuable guidance to drug discovery programs. Robust construct design and expression, protein purification and characterization, protein crystallization, and high-resolution diffraction are all needed for rapid, iterative inhibitor design. We describe here robust methods to support SBDD on an oral anti-cytokine drug target, human MAPKAP kinase 2 (MK2). Our goal was to obtain useful diffraction data with a large number of chemically diverse lead compounds. Although MK2 structures and structural methods have been reported previously, reproducibility was low and improved methods were needed., Results: Our construct design strategy had four tactics: N- and C-terminal variations; entropy-reducing surface mutations; activation loop deletions; and pseudoactivation mutations. Generic, high-throughput methods for cloning and expression were coupled with automated liquid dispensing for the rapid testing of crystallization conditions with minimal sample requirements. Initial results led to development of a novel, customized robotic crystallization screen that yielded MK2/inhibitor complex crystals under many conditions in seven crystal forms. In all, 44 MK2 constructs were generated, ~500 crystals were tested for diffraction, and ~30 structures were determined, delivering high-impact structural data to support our MK2 drug design effort., Conclusion: Key lessons included setting reasonable criteria for construct performance and prioritization, a willingness to design and use customized crystallization screens, and, crucially, initiation of high-throughput construct exploration very early in the drug discovery process.
- Published
- 2009
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