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Dmitry V Burdin, Alexey A Kolobov, Chad Brocker, Alexey A Soshnev, Nikolay Samusik, Anton V Demyanov, Silke Brilloff, Natalia Jarzebska, Jens Martens-Lobenhoffer, Maren Mieth, Renke Maas, Stefan R Bornstein, Stefanie M Bode-Böger, Frank Gonzalez, Norbert Weiss, Roman N Rodionov
Elevated levels of circulating asymmetric and symmetric dimethylarginines (ADMA and SDMA) predict and potentially contribute to end organ damage in cardiovascular diseases. Alanine-glyoxylate aminotransferase 2 (AGXT2) regulates systemic levels of ADMA and SDMA, and also of beta-aminoisobutyric acid (BAIB)-a modulator of lipid metabolism. We identified a putative binding site for hepatic nuclear factor 4 α (HNF4α) in AGXT2 promoter sequence. In a luciferase reporter assay we found a 75% decrease in activity of Agxt2 core promoter after disruption of the HNF4α binding site...
October 18, 2016: Scientific Reports
Hang He, Ya-Li Nie, Jiang-Feng Li, Xiang-Guang Meng, Wei-Hong Yang, Yu-Long Chen, Shu-Jie Wang, Xiaochao Ma, Quan-Cheng Kan, Li-Rong Zhang
CYP3A4 and CYP3A7 are generally served as the major adult and fetal liver forms, respectively, and exhibited a developmental switch during liver maturation. The objective of this study was to explore the potential mechanisms associated with the developmental switch of CYP3A4 and CYP3A7 in the Chinese Han population. We analyzed CYP3A4/7, nuclear receptors, and epigenetic modifications in human liver samples. We found that the expression levels of CYP3A4 mRNA in adults were significantly higher than the levels in fetus...
September 9, 2016: Drug Metabolism and Pharmacokinetics
N A Wijetunga, M Pascual, J Tozour, F Delahaye, M Alani, M Adeyeye, A W Wolkoff, A Verma, J M Greally
The predisposition of patients with Hepatitis C virus (HCV) infection to hepatocellular carcinoma (HCC) involves components of viral infection, inflammation and time. The development of multifocal, genetically distinct tumours is suggestive of a field defect affecting the entire liver. The molecular susceptibility mediating such a field defect is not understood. One potential mediator of long-term cellular reprogramming is heritable (epigenetic) regulation of transcription, exemplified by DNA methylation. We studied epigenetic and transcriptional changes in HCV-infected livers in comparison with control, uninfected livers and HCC, allowing us to identify pre-neoplastic epigenetic and transcriptional events...
October 10, 2016: Oncogene
Ya-Li Nie, Hang He, Jiang-Feng Li, Xiang-Guang Meng, Liang Yan, Pei Wang, Shu-Jie Wang, Hong-Zheng Bi, Li-Rong Zhang, Quan-Cheng Kan
PURPOSE: Complete or partial inactivity of UGT1A1, the unique enzyme responsible for bilirubin glucuronidation, is commonly associated with hyperbilirubinemia. We investigated the dynamic expression of UGT1A1, and that of the transcription factors (TFs) involved in its developmental regulation, during human hepatic growth in Han Chinese individuals. METHODS: Eighty-eight prenatal, pediatric, and adult liver samples were obtained from Han Chinese individuals. Quantitative real-time polymerase chain reaction was used to evaluate mRNA expression of UGT1A1 and TFs including PXR, CAR, HNF1A, HNF4A, PPARA, etc...
October 5, 2016: European Journal of Clinical Pharmacology
Mei-Hua Bao, Huai-Qing Luo, Li-Hua Chen, Liang Tang, Kui-Fen Ma, Ju Xiang, Li-Ping Dong, Jie Zeng, Guang-Yi Li, Jian-Ming Li
Atherosclerosis is a chronic multifactorial inflammatory disease with high prevalence worldwide, and has become the leading cause of death. The present study was designed to investigate the impact of high-fat diet on ApoE(-/-) mice exhibiting atherosclerosis by detecting the genome-wide expression profile of lncRNAs and mRNAs. A total of 354 differentially expressed lncRNAs were identified (≥2.0 folds). Simultaneously, 357 differentially expressed mRNAs from the same chip were found. The expression differences of lncRNAs and mRNAs were consistent in both qPCR and microarray detection...
October 4, 2016: Scientific Reports
Nora Freyer, Fanny Knöspel, Nadja Strahl, Leila Amini, Petra Schrade, Sebastian Bachmann, Georg Damm, Daniel Seehofer, Frank Jacobs, Mario Monshouwer, Katrin Zeilinger
The hepatic differentiation of human induced pluripotent stem cells (hiPSC) holds great potential for application in regenerative medicine, pharmacological drug screening, and toxicity testing. However, full maturation of hiPSC into functional hepatocytes has not yet been achieved. In this study, we investigated the potential of a dynamic three-dimensional (3D) hollow fiber membrane bioreactor technology to improve the hepatic differentiation of hiPSC in comparison to static two-dimensional (2D) cultures. A total of 100 × 10(6) hiPSC were seeded into each 3D bioreactor (n = 3)...
2016: BioResearch Open Access
Loukia N Lili, Attila E Farkas, Christian Gerner-Smidt, Christian E Overgaard, Carlos S Moreno, Charles A Parkos, Christopher T Capaldo, Asma Nusrat
Colonic enterocytes form a rapidly renewing epithelium and barrier to luminal antigens. During renewal, coordinated expression of the claudin family of genes is vital to maintain the epithelial barrier. Disruption of this process contributes to barrier compromise and mucosal inflammatory diseases. However, little is known about the regulation of this critical aspect of epithelial cell differentiation. In order to identify claudin regulatory factors we utilized high-throughput gene microarrays and correlation analyses...
July 2016: Tissue Barriers
Jeffrey W Kleinberger, Kristin A Maloney, Toni I Pollin
The genetic architecture of diabetes mellitus in general and in pregnancy is complex, owing to the multiple types of diabetes that comprise both complex/polygenic forms and monogenic (largely caused by a mutation in a single gene) forms such as maturity-onset diabetes of the young (MODY). Type 1 diabetes (T1D) and type 2 diabetes (T2D) have complex genetic etiologies, with over 40 and 90 genes/loci, respectively, implicated that interact with environmental/lifestyle factors. The genetic etiology of gestational diabetes mellitus has largely been found to overlap that of T2D...
August 29, 2016: American Journal of Perinatology
Jianjun Wang, Ping Zhao, Zhihong Wan, Xueyuan Jin, Yongqian Cheng, Tao Yan, Song Qing, Ning Ding, Shaojie Xin
: The aim of this study was to investigate the differentiation potential of induced pluripotent stem cells (iPSCs) derived from human foreskin fibroblasts (HFFs) into hepatocyte-like cells (HLCs). The iPSCs were firstly induced by transduction of OCT4, SOX2, KLF4, and c-MYC into HFFs using retrovirus. Afterwards, expressions of pluripotency factors were identified by semiquantitative reverse transcription-polymerase chain reaction and immunofluorescence staining, and karyotype, embryoid, and teratoma were observed by microscope...
October 2016: Cell Biochemistry and Function
S Bacon, M P Kyithar, E M Condron, N Vizzard, M Burke, M M Byrne
AIMS: HNF4A is an established cause of maturity onset diabetes of the young (MODY). Congenital hyperinsulinism can also be associated with mutations in the HNF4A gene. A dual phenotype is observed in HNF4A-MODY with hyperinsulinaemic hypoglycaemia in the neonatal period progressing to diabetes in adulthood. The nature and timing of the transition remain poorly defined. We performed an observational study to establish changes in glycaemia and insulin secretion over a 6-year period. We investigated glycaemic variability and hypoglycaemia in HNF4A-MODY using a continuous glucose monitoring system (CGMS)...
August 23, 2016: Acta Diabetologica
Raquel López-Mejías, Fernanda Genre, Sara Remuzgo-Martínez, Carlos González-Juanatey, Montserrat Robustillo-Villarino, Javier Llorca, Alfonso Corrales, Esther Vicente, José A Miranda-Filloy, César Magro, Beatriz Tejera-Segura, Marco A Ramírez Huaranga, Trinitario Pina, Ricardo Blanco, Juan J Alegre-Sancho, Enrique Raya, Verónica Mijares, Begoña Ubilla, María D Mínguez Sánchez, Carmen Gómez-Vaquero, Alejandro Balsa, Dora Pascual-Salcedo, Francisco J López-Longo, Patricia Carreira, Isidoro González-Álvaro, Luis Rodríguez-Rodríguez, Benjamín Fernández-Gutiérrez, Iván Ferraz-Amaro, Santos Castañeda, Javier Martín, Miguel A González-Gay
Association between elevated C-reactive protein (CRP) serum levels and subclinical atherosclerosis and cardiovascular (CV) events was described in rheumatoid arthritis (RA). CRP, HNF1A, LEPR, GCKR, NLRP3, IL1F10, PPP1R3B, ASCL1, HNF4A and SALL1 exert an influence on elevated CRP serum levels in non-rheumatic Caucasians. Consequently, we evaluated the potential role of these genes in the development of CV events and subclinical atherosclerosis in RA patients. Three tag CRP polymorphisms and HNF1A, LEPR, GCKR, NLRP3, IL1F10, PPP1R3B, ASCL1, HNF4A and SALL1 were genotyped in 2,313 Spanish patients by TaqMan...
2016: Scientific Reports
Thomas W Laver, Kevin Colclough, Maggie Shepherd, Kashyap Patel, Jayne A L Houghton, Petra Dusatkova, Stepanka Pruhova, Andrew D Morris, Colin N Palmer, Mark I McCarthy, Sian Ellard, Andrew T Hattersley, Michael N Weedon
HNF4A mutations cause increased birth weight, transient neonatal hypoglycemia, and maturity onset diabetes of the young (MODY). The most frequently reported HNF4A mutation is p.R114W (previously p.R127W), but functional studies have shown inconsistent results; there is a lack of cosegregation in some pedigrees and an unexpectedly high frequency in public variant databases. We confirm that p.R114W is a pathogenic mutation with an odds ratio of 30.4 (95% CI 9.79-125, P = 2 × 10(-21)) for diabetes in our MODY cohort compared with control subjects...
October 2016: Diabetes
Li Liang, Liting Song, Yi Yang, Ling Tian, Xiaoyuan Li, Songfeng Wu, Wenxun Huang, Hong Ren, Ni Tang, Keyue Ding
Significant heterogeneity between different tumors prevents the discovery of cancer driver genes, especially in a patient-specific manner. We previously prioritized five personalized candidate mutation-driver genes in a hyper-mutated hepatocellular carcinoma patient using a multi-omics strategy. However, the roles of the prioritized driver genes and patient-specific mutations in hepatocarcinogenesis are unclear. We investigated the impact of the tumor-mutated allele on structure-function relationship of the encoded protein and assessed both loss- and gain-of-function of these genes and mutations on hepatoma cell behaviors in vitro...
May 21, 2016: Oncotarget
Daulat Raheem Khan, David A Landry, Éric Fournier, Christian Vigneault, Patrick Blondin, Marc-André Sirard
Oocyte developmental competence in superstimulated cows is dependent in part on the duration of the FSH coasting. FSH coasting refers to superstimulation with FSH (2 days of endogenous FSH following follicle ablation and 3 days of FSH injections) followed by no FSH for a specific duration. The optimal duration varies among individuals. FSH coasting appears to modulate the transcriptome of different follicular compartments, which cooperate as a single functional unit. However, the integrative effects of FSH coasting on different follicular compartments remain ambiguous...
August 1, 2016: Physiological Genomics
Nathalie Chami, Ming-Huei Chen, Andrew J Slater, John D Eicher, Evangelos Evangelou, Salman M Tajuddin, Latisha Love-Gregory, Tim Kacprowski, Ursula M Schick, Akihiro Nomura, Ayush Giri, Samuel Lessard, Jennifer A Brody, Claudia Schurmann, Nathan Pankratz, Lisa R Yanek, Ani Manichaikul, Raha Pazoki, Evelin Mihailov, W David Hill, Laura M Raffield, Amber Burt, Traci M Bartz, Diane M Becker, Lewis C Becker, Eric Boerwinkle, Jette Bork-Jensen, Erwin P Bottinger, Michelle L O'Donoghue, David R Crosslin, Simon de Denus, Marie-Pierre Dubé, Paul Elliott, Gunnar Engström, Michele K Evans, James S Floyd, Myriam Fornage, He Gao, Andreas Greinacher, Vilmundur Gudnason, Torben Hansen, Tamara B Harris, Caroline Hayward, Jussi Hernesniemi, Heather M Highland, Joel N Hirschhorn, Albert Hofman, Marguerite R Irvin, Mika Kähönen, Ethan Lange, Lenore J Launer, Terho Lehtimäki, Jin Li, David C M Liewald, Allan Linneberg, Yongmei Liu, Yingchang Lu, Leo-Pekka Lyytikäinen, Reedik Mägi, Rasika A Mathias, Olle Melander, Andres Metspalu, Nina Mononen, Mike A Nalls, Deborah A Nickerson, Kjell Nikus, Chris J O'Donnell, Marju Orho-Melander, Oluf Pedersen, Astrid Petersmann, Linda Polfus, Bruce M Psaty, Olli T Raitakari, Emma Raitoharju, Melissa Richard, Kenneth M Rice, Fernando Rivadeneira, Jerome I Rotter, Frank Schmidt, Albert Vernon Smith, John M Starr, Kent D Taylor, Alexander Teumer, Betina H Thuesen, Eric S Torstenson, Russell P Tracy, Ioanna Tzoulaki, Neil A Zakai, Caterina Vacchi-Suzzi, Cornelia M van Duijn, Frank J A van Rooij, Mary Cushman, Ian J Deary, Digna R Velez Edwards, Anne-Claire Vergnaud, Lars Wallentin, Dawn M Waterworth, Harvey D White, James G Wilson, Alan B Zonderman, Sekar Kathiresan, Niels Grarup, Tõnu Esko, Ruth J F Loos, Leslie A Lange, Nauder Faraday, Nada A Abumrad, Todd L Edwards, Santhi K Ganesh, Paul L Auer, Andrew D Johnson, Alexander P Reiner, Guillaume Lettre
Red blood cell (RBC) traits are important heritable clinical biomarkers and modifiers of disease severity. To identify coding genetic variants associated with these traits, we conducted meta-analyses of seven RBC phenotypes in 130,273 multi-ethnic individuals from studies genotyped on an exome array. After conditional analyses and replication in 27,480 independent individuals, we identified 16 new RBC variants. We found low-frequency missense variants in MAP1A (rs55707100, minor allele frequency [MAF] = 3...
July 7, 2016: American Journal of Human Genetics
H Heuvel-Borsboom, H W de Valk, M Losekoot, J Westerink
Maturity onset diabetes of the young (MODY) is a monogenic, autosomal dominant form of diabetes characterised by mutations in genes resulting in dysfunction of pancreatic β-cells and subsequent insulin production. We present a family with HNF1A-MODY due to a likely pathogenic mutation in HNF1A (c.59G>A, p.Gly20Glu), diagnosed a long time after the first diagnosis of diabetes. Currently 13 MODY subtypes caused by mutations in 13 genes, are known. We describe the four most prevalent forms in more detail, i...
June 2016: Netherlands Journal of Medicine
Renata P Dotto, Fernando M A Giuffrida, Luciana Franco, Andreia L G Mathez, Leticia S Weinert, Sandra P Silveiro, Joao R Sa, Andre F Reis, Magnus R Dias-da-Silva
Thirty-two patients with diabetes negative for point mutations in GCK and HNF1A underwent further molecular screening of GCK, HNF1A, HNF4A, and HNF1B by MLPA analysis. We described the first Brazilian case of MODY5 due to a heterozygous whole-gene deletion in HNF1B, who developed rapidly progressive renal failure and death.
June 2016: Diabetes Research and Clinical Practice
Nicola Improda, Pratik Shah, Maria Güemes, Clare Gilbert, Kate Morgan, Neil Sebire, Detlef Bockenhauer, Khalid Hussain
BACKGROUND: The p.R63W mutation in the hepatocyte nuclear factor-4 alpha (HNF4A) results in macrosomia and atypical Fanconi syndrome, in addition to hyperinsulinaemic hypoglycaemia (HI). We describe 2 infants carrying this mutation, presenting with additional features. Cases Series: Patient 1, a male born with a birth weight of 1.7 SDS, was diagnosed with HI on day 2 of life. He responded to 3-10 mg/kg/day of diazoxide. Raised serum creatinine led to the investigation of renal tubular function, showing leaking of electrolytes and protein...
June 1, 2016: Hormone Research in Pædiatrics
Zhaowei Qu, Di Li, Haitao Xu, Rujia Zhang, Bing Li, Chengming Sun, Wei Dong, Yubao Zhang
UNLABELLED:  Introduction and Aim. TGF-β signalling is involved in pathogenesis and progress of hepatocellular carcinoma (HCC). This bioinformatics study consequently aims to determine the underlying molecular mechanism of TGF- β activation in HCC cells. MATERIAL AND METHODS: Dataset GSE10393 was downloaded from Gene Expression Omnibus, including 2 Huh-7 (HCC cell line) samples treated by TGF- β (100 pmol/L, 48 h) and 2 untreated samples. Differentially expressed genes (DEGs) were screened using Limma package (false discovery rate < 0...
July 2016: Annals of Hepatology
Neda Yahoo, Behshad Pournasr, Jalal Rostamzadeh, Fardin Fathi
Embryonic stem (ES) cells are capable of unlimited self-renewal and have a diverse differentiation potential. These unique features make ES cells as an attractive source for developmental biology studies. Having the mature hepatocyte in the lab with functional activities is valuable in drug discovery studies. Overexpression of hepatocyte lineage-specific transcription factors (TFs) becomes a promising approach in pluripotent cell differentiation toward liver cells. Many studies generate transgenic ES cell lines to examine the effects of specific TFs overexpression in cell differentiation...
August 5, 2016: Biochemical and Biophysical Research Communications
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