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Dnmt3a

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https://www.readbyqxmd.com/read/28718369/mir-143-inhibits-cell-proliferation-and-invasion-by-targeting-dnmt3a-in-gastric-cancer
#1
Quan Zhang, Yong Feng, Ping Liu, Jing Yang
Increasing evidence has suggested that MircroRNAs (miRNAs) dysregulated in pathogenesis and tumorigenicity in human cancers including gastric cancer (GC). MiR-143 had been reported to function as tumor suppressor in GC progression, however, the underlying function of miR-143 in GC still need to be well known. In the study, we revealed that miR-143 was significantly down-regulated in GC cell lines. Upregulation of miR-143 inhibited cell proliferation, invasion, S phase cell proportion and cell cycle related protein levels of Cyclin D1, CDK4 and CDK6 in GC...
July 2017: Tumour Biology: the Journal of the International Society for Oncodevelopmental Biology and Medicine
https://www.readbyqxmd.com/read/28713819/differential-analysis-of-genetic-epigenetic-and-cytogenetic-abnormalities-in-aml
#2
Mirazul Islam, Zahurin Mohamed, Yassen Assenov
Acute myeloid leukemia (AML) is a haematological malignancy characterized by the excessive proliferation of immature myeloid cells coupled with impaired differentiation. Many AML cases have been reported without any known cytogenetic abnormalities and carry no mutation in known AML-associated driver genes. In this study, 200 AML cases were selected from a publicly available cohort and differentially analyzed for genetic, epigenetic, and cytogenetic abnormalities. Three genes (FLT3, DNMT3A, and NPMc) are found to be predominantly mutated...
2017: International Journal of Genomics
https://www.readbyqxmd.com/read/28712054/alcohol-exposure-promotes-dna-methyltransferase-dnmt3a-upregulation-through-reactive-oxygen-species-dependent-mechanisms
#3
Federico Miozzo, Hélène Arnould, Aurélie de Thonel, Anne-Laure Schang, Délara Sabéran-Djoneidi, Anne Baudry, Benoît Schneider, Valérie Mezger
Abundant evidence has accumulated showing that fetal alcohol exposure broadly modifies DNA methylation profiles in the brain. DNA methyltransferases (DNMTs), the enzymes responsible for DNA methylation, are likely implicated in this process. However, their regulation by ethanol exposure has been poorly addressed. Here, we show that alcohol exposure modulates DNMT protein levels through multiple mechanisms. Using a neural precursor cell line and primary mouse embryonic fibroblasts (MEFs), we found that ethanol exposure augments the levels of Dnmt3a, Dnmt3b, and Dnmt3l transcripts...
July 15, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28710961/epigenetic-modification-differences-between-fetal-fibroblast-cells-and-mesenchymal-stem-cells-of-the-arbas-cashmere-goat
#4
Xiao Wang, Zhimin Wang, Qing Wang, Hefei Wang, Hao Liang, Dongjun Liu
To explore the epigenetic mechanisms regulating mesenchymal stem cells, we analyzed epigenetic patterns in control goat fetal fibroblast cells (gFFCs), adipose-derived stem cells (gADSCs), bone marrow stromal cells (gBMSCs), and muscle-derived satellite cells (gMDSCs). We found that the 5mC content of gBMSC genomes was lower than that of gFFC genomes, while the 5mC content of gADSC and gMDSC genomes surpassed that of gFFC genomes. H3K9 acetylation did not differ significantly among those cells; gFFCs, gADSCs, and gMDSCs contained acetylated H3K9, H3K14, H3K18, H4K5, and H4K12, but gBMSCs contained almost no acetylated H4K5 and H4K12...
July 9, 2017: Research in Veterinary Science
https://www.readbyqxmd.com/read/28710806/clinical-features-and-prognostic-impact-of-prdm16-expression-in-adult-acute-myeloid-leukemia
#5
Genki Yamato, Hiroki Yamaguchi, Hiroshi Handa, Norio Shiba, Machiko Kawamura, Satoshi Wakita, Koiti Inokuchi, Yusuke Hara, Kentaro Ohki, Jun Okubo, Myoung-Ja Park, Manabu Sotomatsu, Hirokazu Arakawa, Yasuhide Hayashi
High PRDM16 (also known as MEL1) expression is a representative marker of acute myeloid leukemia (AML) with NUP98-NSD1 and is a significant predictive marker for poor prognosis in pediatric AML. However, the clinical features of adult AML with PRDM16 expression remain unclear. PRDM16 is highly homologous to MDS1/EVI1, which is an alternatively spliced transcript of MECOM (also known as EVI1). We investigated PRDM16 expression in 151 AML patients, with 47 (31%) exhibiting high PRDM16 expression (PRDM16/ABL1 ratio ≥ 0...
July 14, 2017: Genes, Chromosomes & Cancer
https://www.readbyqxmd.com/read/28699658/telomere-length-and-somatic-mutations-in-correlation-with-response-to-immunosuppressive-treatment-in-aplastic-anaemia
#6
Hee S Park, Si N Park, Kyongok Im, Sung-Min Kim, Jung-Ah Kim, Sang M Hwang, Dong S Lee
We investigated the frequencies of cytogenetic aberrations and somatic mutations of prognostic relevance in 393 patients with aplastic anaemia (AA). Clonality was determined by G-banding/fluorescence in situ hybridization (FISH) (n = 245), and targeted capture sequencing was performed for 88 haematopoiesis-related genes (n = 70). The telomere length (TL) of bone marrow nucleated cells was measured at the single cell level by FISH (n = 135). Eighteen (4·6%) patients showed disease progression, and monosomy 7 (50·0%) was the most predominant cytogenetic evolution at disease transformation...
July 12, 2017: British Journal of Haematology
https://www.readbyqxmd.com/read/28698141/epigenetic-silencing-of-the-wnt-antagonist-apcdd1-by-promoter-dna-hyper-methylation-contributes-to-osteosarcoma-cell-invasion-and-metastasis
#7
Weifeng Han, Junpeng Liu
Osteosarcoma (OS) is the most common type of bone tumor in children and adults. However, the molecular mechanism underlying OS tumorigenesis remains unclear. Here, we report that the expression of APCDD1, a Wnt antagonist, was reduced in OS tissues and cells compared to adjacent normal tissue and osteoblast cells, respectively. Mechanistically, this was due to increased levels of methylation in the promoter region of the APCDD1 gene. Consistently, the DNA methyltransferase inhibitor 5-AZA-dC, reduced DNA methylation in the APCDD1 promoter, and restored APCDD1 expression in OS tissue and cells...
July 8, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28687222/tp53-and-idh2-somatic-mutations-are-associated-with-inferior-overall-survival-after-allogeneic-hematopoietic-cell-transplantation-for-myelodysplastic-syndrome
#8
Mohamed A Kharfan-Dabaja, Rami S Komrokji, Qing Zhang, Ambuj Kumar, Athanasios Tsalatsanis, Janelle Perkins, Taiga Nishihori, Teresa Field, Najla Al Ali, Asmita Mishra, David Sallman, Karma Z Salem, Ling Zhang, Lynn Moscinski, Hugo F Fernandez, Jeffrey Lancet, Alan List, Claudio Anasetti, Eric Padron
BACKGROUND: Next-generation sequencing has identified somatic mutations that are prognostic of cancer. PATIENTS AND METHODS: We evaluated the incidence and prognostic significance of somatic mutations in 89 myelodysplastic syndrome (MDS) patients who received an allogeneic hematopoietic cell transplantation. Next-generation sequencing was performed on paraffin embedded bone marrow, which was obtained at a median of 31 days before initiating the preparative regimen...
June 16, 2017: Clinical Lymphoma, Myeloma & Leukemia
https://www.readbyqxmd.com/read/28676341/the-circular-rna-interacts-with-stat3-increasing-its-nuclear-translocation-and-wound-repair-by-modulating-dnmt3a-and-mir-17-function
#9
Zhen-Guo Yang, Faryal Mehwish Awan, William W Du, Yan Zeng, Juanjuan Lyu, De Wu, Shaan Gupta, Weining Yang, Burton B Yang
Delayed or impaired wound healing is a major health issue worldwide, especially in patients with diabetes and atherosclerosis. Here we show that expression of the circular RNA circ-Amotl1 accelerated healing process in a mouse excisional wound model. Further studies showed that ectopic circ-Amotl1 increased protein levels of Stat3 and Dnmt3a. The increased Dnmt3a then methylated the promoter of microRNA miR-17, decreasing miR-17-5p levels but increasing fibronectin expression. We found that Stat3, similar to Dnmt3a and fibronectin, was a target of miR-17-5p...
July 1, 2017: Molecular Therapy: the Journal of the American Society of Gene Therapy
https://www.readbyqxmd.com/read/28669404/ultra-sensitive-sequencing-identifies-high-prevalence-of-clonal-hematopoiesis-associated-mutations-throughout-adult-life
#10
Rocio Acuna-Hidalgo, Hilal Sengul, Marloes Steehouwer, Maartje van de Vorst, Sita H Vermeulen, Lambertus A L M Kiemeney, Joris A Veltman, Christian Gilissen, Alexander Hoischen
Clonal hematopoiesis results from somatic mutations in hematopoietic stem cells, which give an advantage to mutant cells, driving their clonal expansion and potentially leading to leukemia. The acquisition of clonal hematopoiesis-driver mutations (CHDMs) occurs with normal aging and these mutations have been detected in more than 10% of individuals ≥65 years. We aimed to examine the prevalence and characteristics of CHDMs throughout adult life. We developed a targeted re-sequencing assay combining high-throughput with ultra-high sensitivity based on single-molecule molecular inversion probes (smMIPs)...
July 6, 2017: American Journal of Human Genetics
https://www.readbyqxmd.com/read/28669403/a-genetic-variant-ameliorates-%C3%AE-thalassemia-severity-by-epigenetic-mediated-elevation-of-human-fetal-hemoglobin-expression
#11
Diyu Chen, Yangjin Zuo, Xinhua Zhang, Yuhua Ye, Xiuqin Bao, Haiyan Huang, Wanicha Tepakhan, Lijuan Wang, Junyi Ju, Guangfu Chen, Mincui Zheng, Dun Liu, Shuodan Huang, Lu Zong, Changgang Li, Yajun Chen, Chenguang Zheng, Lihong Shi, Quan Zhao, Qiang Wu, Supan Fucharoen, Cunyou Zhao, Xiangmin Xu
A delayed fetal-to-adult hemoglobin (Hb) switch ameliorates the severity of β-thalassemia and sickle cell disease. The molecular mechanism underlying the epigenetic dysregulation of the switch is unclear. To explore the potential cis-variants responsible for the Hb switching, we systematically analyzed an 80-kb region spanning the β-globin cluster using capture-based next-generation sequencing of 1142 Chinese β-thalassemia persons and identified 31 fetal hemoglobin (HbF)-associated haplotypes of the selected 28 tag regulatory single-nucleotide polymorphisms (rSNPs) in seven linkage disequilibrium (LD) blocks...
July 6, 2017: American Journal of Human Genetics
https://www.readbyqxmd.com/read/28667884/exome-sequencing-reveals-dnmt3a-and-asxl1-variants-associate-with-progression-of-chronic-myeloid-leukemia-after-tyrosine-kinase-inhibitor-therapy
#12
TaeHyung Kim, Marc S Tyndel, Zhaolei Zhang, Jaesook Ahn, Seunghyun Choi, Michael Szardenings, Jeffrey H Lipton, Hyeoung-Joon Kim, Dennis Kim Dong Hwan
OBJECTIVE: The development of tyrosine kinase inhibitors (TKIs) has significantly improved the treatment of chronic myeloid leukemia (CML). However, approximately one third of patients are resistant to TKI and/or progress to advanced disease stages. TKI therapy failure has a well-known association with ABL1 kinase domain (KD) mutations, but only around half of TKI non-responders have detectable ABL1 KD mutations. METHOD: We attempt to identify genetic markers associated with TKI therapy failure in 13 patients (5 resistant, 8 progressed) without ABL1 KD mutations using whole-exome sequencing...
June 16, 2017: Leukemia Research
https://www.readbyqxmd.com/read/28663119/minimal-traumatic-brain-injury-causes-persistent-changes-in-dna-methylation-at-bdnf-gene-promoters-in-rat-amygdala-a-possible-role-in-anxiety-like-behaviors
#13
Sneha Sagarkar, Tanmayi Bhamburkar, Gajanan Shelkar, Amit Choudhary, Dadasaheb M Kokare, Amul J Sakharkar
Minimal traumatic brain injury (MTBI) often transforms into chronic neuropsychiatric conditions including anxiety, the underlying mechanisms of which are largely unknown. In the present study, we employed the closed-head injury paradigm to induce MTBI in rats and examined whether DNA methylation can explain long-term changes in the expression of the brain-derived neurotrophic factor (BDNF) in the amygdala as well as trauma-induced anxiety-like behaviors. The MTBI caused anxiety-like behaviors and altered the expression of DNA methyltransferase (DNMT) isoforms (DNMT1, DNMT3a, and DNMT3b) and factors involved in DNA demethylation such as the growth arrest and DNA damage 45 (GADD45a and GADD45b)...
June 27, 2017: Neurobiology of Disease
https://www.readbyqxmd.com/read/28662198/genetic-background-and-embryonic-temperature-affect-dna-methylation-and-expression-of-myogenin-and-muscle-development-in-atlantic-salmon-salmo-salar
#14
Erik Burgerhout, Maren Mommens, Hanne Johnsen, Arnfinn Aunsmo, Nina Santi, Øivind Andersen
The development of ectothermic embryos is strongly affected by incubation temperature, and thermal imprinting of body growth and muscle phenotype has been reported in various teleost fishes. The complex epigenetic regulation of muscle development in vertebrates involves DNA methylation of the myogenin promoter. Body growth is a heritable and highly variable trait among fish populations that allows for local adaptations, but also for selective breeding. Here we studied the epigenetic effects of embryonic temperature and genetic background on body growth, muscle cellularity and myogenin expression in farmed Atlantic salmon (Salmo salar)...
2017: PloS One
https://www.readbyqxmd.com/read/28655780/dnmt3a-and-tet2-dominate-clonal-hematopoiesis-demonstrate-benign-phenotypes-and-different-genetic-predisposition
#15
Manuel Buscarlet, Sylvie Provost, Yassamin Feroz Zada, Amina Barhdadi, Vincent Bourgoin, Guylaine Lépine, Luigina Mollica, Natasha Szuber, Marie-Pierre Dubé, Lambert Busque
Age-associated clonal hematopoiesis caused by acquired mutations in myeloid cancer associated genes is highly prevalent in the normal population. Its etiology, biological impact on hematopoiesis and oncogenic risk is poorly defined at this time. To gain insight into this phenomenon, we analyzed a cohort of 2530 related and unrelated hematologically normal individuals (aged 55 to 101). We used a sensitive gene targeted deep sequencing approach to gain precision on the exact prevalence of driver mutations and the proportions of affected genes...
June 27, 2017: Blood
https://www.readbyqxmd.com/read/28654901/20-s-rg3-blocked-epithelial-mesenchymal-transition-through-dnmt3a-mir-145-fscn1-in-ovarian-cancer
#16
Jie Li, Jiaojiao Lu, Zhongxue Ye, Xi Han, Xia Zheng, Huilian Hou, Wei Chen, Xu Li, Le Zhao
Epithelial-mesenchymal transition (EMT) is one of the key mechanisms mediating cancer progression. MicroRNAs (miRs) are essential regulators of gene expression by suppressing translation or causing degradation of target mRNA. Growing evidence illustrates the crucial roles of miRs dysregulation in cancer development and progression. Here, we have found for the first time that the ginsenoside 20(S)-Rg3, a pharmacologically active component of Panax ginseng, potently increases miR-145 expression by downregulating methyltransferase DNMT3A to attenuate the hypermethylation of the promoter region in the miR-145 precursor gene...
June 15, 2017: Oncotarget
https://www.readbyqxmd.com/read/28653397/acute-myeloid-leukaemia-genomics
#17
REVIEW
Michael Medinger, Jakob R Passweg
Acute myeloid leukaemia (AML) is a biologically complex, molecularly and clinically heterogeneous disease. Despite major advances in understanding the genetic landscape of AML and its impact on the pathophysiology and biology of the disease, standard treatment options have not significantly changed during the past three decades. AML is characterized by multiple somatically acquired mutations that affect genes of different functional categories. Mutations in genes encoding epigenetic modifiers, such as DNMT3A, ASXL1, TET2, IDH1, and IDH2, are commonly acquired early and are present in the founding clone...
June 27, 2017: British Journal of Haematology
https://www.readbyqxmd.com/read/28651580/sex-specific-lung-functional-changes-in-adult-mice-exposed-only-to-second-hand-smoke-in-utero
#18
Alexandra Noël, Rui Xiao, Zakia Perveen, Hasan Zaman, Viviana Le Donne, Arthur Penn
BACKGROUND: An increasing number of epidemiological and experimental studies have associated exposure to second-hand smoke (SHS) during pregnancy with adverse outcomes in newborns. As we have previously shown in mice, in utero exposure to SHS at critical stages of fetal development, results in altered lung responses and increased disease susceptibility upon re-exposure to irritants (SHS or ovalbumin) in adulthood. In this study, we asked whether the in utero SHS exposure alone is sufficient to alter lung structure and function in adult mice...
June 27, 2017: Respiratory Research
https://www.readbyqxmd.com/read/28643785/dnmt3a-mutant-transcript-levels-persist-in-remission-and-do-not-predict-outcome-in-patients-with-acute-myeloid-leukemia
#19
V I Gaidzik, D Weber, P Paschka, A Kaumanns, S Krieger, A Corbacioglu, J Krönke, S Kapp-Schwoerer, D Krämer, H-A Horst, I Schmidt-Wolf, G Held, A Kündgen, M Ringhoffer, K Götze, T Kindler, W Fiedler, M Wattad, R F Schlenk, L Bullinger, V Teleanu, B Schlegelberger, F Thol, M Heuser, A Ganser, H Döhner, K Döhner
We investigated the prognostic impact of minimal residual disease (MRD) monitoring in acute myeloid leukemia (AML) patients harboring DNA methyltransferase 3A-R882H/-R882C mutations (DNMT3A(mut)). MRD was determined by real-time quantitative polymerase chain reaction (RQ-PCR) in 1,494 samples of 181 DNMT3A(mut) patients. At the time of diagnosis, DNMT3A(mut) transcript levels did not correlate with presenting clinical characteristics, concurrent gene mutations as well as the survival endpoints. In Cox regression analyses, bone marrow DNMT3A(mut) transcript levels (log 10 transformed continuous variable) were not associated with the rate of relapse or death...
June 23, 2017: Leukemia: Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K
https://www.readbyqxmd.com/read/28642303/molecular-analysis-of-myelodysplastic-syndrome-with-isolated-del-5q-reveals-a-specific-spectrum-of-molecular-mutations-with-prognostic-impact-a-study-on-123-patients-and-27-genes
#20
Manja Meggendorfer, Claudia Haferlach, Wolfgang Kern, Torsten Haferlach
The only cytogenetic aberration defining a myelodysplastic syndrome subtype is the deletion of the long arm of chromosome 5, giving with morphological features the diagnosis of myelodysplastic syndrome with isolated del(5q). These patients show a good prognosis and respond to treatment such as lenalidomide, but some cases progress to acute myeloid leukemia. However, the molecular mutation pattern is rarely characterized. Therefore, we investigated a large cohort of 123 myelodysplastic syndrome patients with isolated del(5q) diagnosed following the World Health Organization classifications 2008 and 2016 by sequencing 27 genes...
June 22, 2017: Haematologica
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