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| Registros recuperados: 32 | |
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| Bezerra,Stephane Flaviane de Oliveira; Costa,Ludimila de Araújo; Freitas,Priscylla Alves Nascimento de; Oliveira,Naila Francis Paulo de. |
| The purpose of this study was to investigate the effect of aging on the DNA methylation status of two genes involved in tumorigenesis (telomerase gene hTERT and DNA repair gene- MLH1) and one in metabolism (methylenetetrahydrofolate reductase gene- MTHFR) in oral epithelial cells. DNA methylation analysis was performed by Methylation Sensitive Restriction Enzymes (MSRE) of healthy oral epithelial cells of child (6-10 years, n=21), young (20-25 years, n=19) and elderly (over 60 years, n=25). The results for the hTERT gene showed significant variation in the methylation frequency at CpG dinucleotides among the groups (p=0.0001), with the methylated condition more frequently in children and young people. In relation to MLH1 and MTHFR, no differences were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Epigenetic; DNA methylation; Aging; DNA repair; Telomerase; MTHFR. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132015000100082 |
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| Rastogi,Meenal; Gupta,Sameer; Sachan,Manisha. |
| ABSTRACT Ovarian carcinoma accounts for highest mortality of all gynecologic malignancies as the disease is asymptomatic until late stages. Biomarkers such as CA-125 and HE4 are being currently used for diagnosis of ovarian cancer, but they show contradicting diagnostic accuracy. Therefore other biomarkers have been investigated for early detection of this disease, but no success has been obtained and no test has yet been recommended for screening a general population. In this instance, aptamers can be effectively used to identify tumor-specific antigens for early diagnosis and targeted therapy of ovarian cancer. This article provides an overview of the biomarkers/panels being explored as well as the potential of aptamers to improve current long-term... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ovarian cancer; Aptamers; DNA methylation; CA-125; HE4. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132016000100346 |
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| Sussarellu, Rossana; Lebreton, Morgane; Rouxel, Julien; Akcha, Farida; Riviere, Guillaume. |
| Copper contamination is widespread along coastal areas and exerts adverse effects on marine organisms such as mollusks. In the Pacific oyster, copper induces severe developmental abnormalities during early life stages; however, the underlying molecular mechanisms are largely unknown. This study aims to better understand whether the embryotoxic effects of copper in Crassostrea gigas could be mediated by alterations in gene expression, and the putative role of DNA methylation, which is known to contribute to gene regulation in early embryo development. For that purpose, oyster embryos were exposed to 4 nominal copper concentrations (0.1, 1, 10 and 20 μg L−1 Cu2+) during early development assays. Embryotoxicity was monitored through the oyster embryo-larval... |
| Tipo: Text |
Palavras-chave: Oyster; Embryotoxicity; Copper; Gene expression; DNA methylation. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00417/52856/53756.pdf |
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| Araújo,A.; Ramos,E.S.. |
| The high abortion rate of 45,X embryos indicates that patients with Turner syndrome and 45,X karyotype could be mosaics, in at least one phase of embryo development or cellular lineage, due to the need for the other sex chromosome presence for conceptus to be compatible with life. In cases of structural chromosomal aberrations or hidden mosaicism, conventional cytogenetic techniques can be ineffective and molecular investigation is indicated. Two hundred and fifty patients with Turner syndrome stigmata were studied and 36 who had female genitalia and had been cytogenetically diagnosed as having "pure" 45,X karyotype were selected after 100 metaphases were analyzed in order to exclude mosaicism and the presence of genomic Y-specific sequences (SRY, TSPY,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Turner syndrome; X-inactivation; HUMARA assay; DNA methylation; Criptic mosaicism. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2008000500004 |
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| Covelo-soto, Lara; Moran, Paloma; Pasantes, Juan J.; Perez Garcia, Maria Concepcion. |
| This work explores both the chromatin loss and the differential genome methylation in the sea lamprey (Petromyzon marinus) from a molecular cytogenetic point of view. Fluorescent in situ hybridization experiments on meiotic bivalents and mitotic chromosomes corroborate the chromatin loss previously observed during the development of the sea lamprey and demonstrate that the elimination affects not only to Germ1 sequences but also to the rpt200 satellite DNA and most part of the major ribosomal DNA present on the germinal line. 5-Methylcytosine immunolocation revealed that the GC-rich heterochromatin is highly methylated in the germ line but significantly less in somatic chromosomes. These findings not only support previous observations about genome... |
| Tipo: Text |
Palavras-chave: Sea lamprey; Chromatin loss; Genome rearrangements; DNA methylation. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00247/35811/34327.pdf |
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| Dugé De Bernonville, Thomas; Maury, Stéphane; Delaunay, Alain; Daviaud, Christian; Chaparro, Cristian; Tost, Jörg; O’connor, Sarah Ellen; Courdavault, Vincent. |
| Catharanthus roseus produces a wide spectrum of monoterpene indole alkaloids (MIAs). MIA biosynthesis requires a tightly coordinated pathway involving more than 30 enzymatic steps that are spatio-temporally and environmentally regulated so that some MIAs specifically accumulate in restricted plant parts. The first regulatory layer involves a complex network of transcription factors from the basic Helix Loop Helix (bHLH) or AP2 families. In the present manuscript, we investigated whether an additional epigenetic layer could control the organ-, developmental- and environmental-specificity of MIA accumulation. We used Whole-Genome Bisulfite Sequencing (WGBS) together with RNA-seq to identify differentially methylated and expressed genes among nine samples... |
| Tipo: Text |
Palavras-chave: Alkaloids; DNA methylation; Epigenetics; Folivory; Organs; Plant specialized metabolism. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00652/76453/77543.pdf |
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| SOUZA, M. M. de; NICIURA, S. C. M.; ROCHA, M. I. P.; PAN, Z.; ZHOU, H.; BRUSCADIN, J. J.; DINIZ, W. J. da S.; AFONSO, J.; OLIVEIRA, P. S. N. de; MOURÃO, G. B.; ZERLOTINI NETO, A.; COUTINHO, L. L.; KOLTES, J. E.; REGITANO, L. C. de A.. |
| Abstract. Background:Beef tenderness is a complex trait of economic importance for the beef industry. Understanding the epigenetic mechanisms underlying this trait may help improve the accuracy of breeding programs. However, little is known about epigenetic effects on Bos taurus muscle and their implications in tenderness, and no studies have been conducted in Bos indicus.Results:Comparing methylation profile of Bos indicus skeletal muscle with contrasting beef tenderness at 14 days after slaughter, we identified differentially methylated cytosines and regions associated with this trait. Interestingly, muscle that became tender beef had higher levels of hypermethylation compared to the tough group. Enrichment analysis of predicted target genes suggested... |
| Tipo: Artigo de periódico |
Palavras-chave: Nelore; Epigenoma; Músculo de nelore; RRBS; GNAS; EBF3; Força de cisalhamento; Shear force; Epigenome; Muscle; Metilação; Bos Taurus; Bos Indicus; Músculo; Cattle; Methylation; DNA methylation. |
| Ano: 2022 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1144144 |
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| Wang,Dongxu; Wang,Guodong; Yang,Hao; Liu,Haibo; Li,Cuie; Li,Xiaolan; Lin,Chao; Song,Yuning; Li,Zhanjun; Liu,Dianfeng. |
| Abstract The sexually dimorphic expression of H19/IGF2 is evolutionarily conserved. To investigate whether the expression of H19/IGF2 in the female porcine eye is sex-dependent, gene expression and methylation status were evaluated using quantitative real-time PCR (qPCR) and bisulfite sequencing PCR (BSP). We hypothesized that H19/IGF2 might exhibit a different DNA methylation status in the female eye. In order to evaluate our hypothesis, parthenogenetic (PA) cells were used for analysis by qPCR and BSP. Our results showed that H19 and IGF2 were over-expressed in the female eye compared with the male eye (3-fold and 2-fold, respectively). We observed a normal monoallelic methylation pattern for H19 differentially methylated regions (DMRs). Compared with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: H19/IGF2; Gene expression; DNA methylation; Parthenogenetic; Pig. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572017000100153 |
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| Anastasiadi, Dafni; Vandeputte, Marc; Sanchez-baizan, Nuria; Allal, Francois; Piferrer, Francesc. |
| The integration of genomic and environmental influences into methylation patterns to bring about a phenotype is of central interest in developmental epigenetics, but many details are still unclear. The sex ratios of the species used here, the European sea bass, are determined by genetic and temperature influences. We created four families from parents known to produce offspring with different sex ratios, exposed larvae to masculinizing temperatures and examined, in juvenile gonads, the DNA methylation of seven genes related to sexual development by a targeted sequencing approach. The genes most affected by both genetics and environment were cyp19a1a and dmrt1, with contrasting sex-specific methylation and temperature responses. The relationship between... |
| Tipo: Text |
Palavras-chave: Early development; Environmental temperature; DNA methylation; Sex determination; Aromatase; Cyp19a1a; Dmrt1; Epigenetic marks; DNA methylation threshold; Epigenetic inheritance. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00470/58123/61657.pdf |
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| Rondon Sallan, Rodolfo; Grunau, Christoph; Fallet, Manon; Charlemagne, Nicolas; Sussarellu, Rossana; Chaparro, Cristian; Montagnani, Caroline; Mitta, Guillaume; Bachere, Evelyne; Akcha, Farida; Cosseau, Celine. |
| Environmental epigenetic is an emerging field that studies the cause-effect relationship between environmental factors and heritable trait via an alteration in epigenetic marks. This field has received much attentions since the impact of environmental factors on different epigenetic marks have been shown to be associated with a broad range of phenotypic disorders in natural ecosystems. Chemical pollutants have been shown to affect immediate epigenetic information carriers of several aquatic species but the heritability of the chromatin marks and the consequences for long term adaptation remain open questions. In this work, we investigated the impact of the diuron herbicide on the DNA methylation pattern of spat from exposed Crassotrea gigas genitors. This... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Mollusk; DNA methylation; Herbicide; Epigenetic. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00602/71413/69895.pdf |
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| Stenger, Pierre-louis; Ky, Chin-long; Reisser, Celine; Cosseau, Céline; Grunau, Christoph; Mege, Mickael; Planes, Serge; Vidal-dupiol, Jeremie. |
| Today, it is common knowledge that environmental factors can change the color of many animals. Studies have shown that the molecular mechanisms underlying such modifications could involve epigenetic factors. Since 2013, the pearl oyster Pinctada margaritifera var. cumingii has become a biological model for questions on color expression and variation in Mollusca. A previous study reported color plasticity in response to water depth variation, specifically a general darkening of the nacre color at greater depth. However, the molecular mechanisms behind this plasticity are still unknown. In this paper, we investigate the possible implication of epigenetic factors controlling shell color variation through a depth variation experiment associated with a DNA... |
| Tipo: Text |
Palavras-chave: Pearl oyster; Environmental pressure; Depth; Color change; Pigmentation; DNA methylation; Methylome characterization. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00685/79667/82436.pdf |
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| Cardoso-Júnior,Carlos A.M.; Fujimura,Patrícia Tieme; Santos-Júnior,Célio Dias; Borges,Naiara Araújo; Ueira-Vieira,Carlos; Hartfelder,Klaus; Goulart,Luiz Ricardo; Bonetti,Ana Maria. |
| Abstract Stingless bees of the genus Melipona, have long been considered an enigmatic case among social insects for their mode of caste determination, where in addition to larval food type and quantity, the genotype also has a saying, as proposed over 50 years ago by Warwick E. Kerr. Several attempts have since tried to test his Mendelian two-loci/two-alleles segregation hypothesis, but only recently a single gene crucial for sex determination in bees was evidenced to be sex-specifically spliced and also caste-specifically expressed in a Melipona species. Since alternative splicing is frequently associated with epigenetic marks, and the epigenetic status plays a major role in setting the caste phenotype in the honey bee, we investigated here epigenetic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: DNA methylation; Histone modification; Caste development; Social bees; Genetic caste determination. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572017000100061 |
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| Lima,E.M.; Leal,M.F.; Burbano,R.R.; Khayat,A.S.; Assumpção,P.P.; Bello,M.J.; Rey,J.A.; Smith,M.A.C.; Casartelli,C.. |
| Gastric cancer is the forth most frequent malignancy and the second most common cause of cancer death worldwide. DNA methylation is the most studied epigenetic alteration, occurring through a methyl radical addition to the cytosine base adjacent to guanine. Many tumor genes are inactivated by DNA methylation in gastric cancer. We evaluated the DNA methylation status of ANAPC1, CDKN2A and TP53 by methylation-specific PCR in 20 diffuse- and 26 intestinal-type gastric cancer samples and 20 normal gastric mucosa in individuals from Northern Brazil. All gastric cancer samples were advanced stage adenocarcinomas. Gastric samples were surgically obtained at the João de Barros Barreto University Hospital, State of Pará, and were stored at -80°C before DNA... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: DNA methylation; Gastric cancer; ANAPC1; CDKN2A; TP53. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2008000600017 |
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| Registros recuperados: 32 | |
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