Alterations of DNA methylation seem to be an early event in

<!DOCTYPE html> <html lang="pt"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>Alterations of DNA methylation seem to be an early event in | 93517</title> <meta name="keywords" content="Sheila Coelho Soares Lima Brazilian National Cancer Institute–INCA, Brazil, "/> <meta name="description" content="Extended Abstract Introduction: Statement of the Problem: Tumors from the upper aerodigestive tract (UADT) rank among the 10 most frequent neoplasias wo..93517"/> <meta name="citation_publisher" content="Primeiros Acadêmicos" /> <meta name="citation_journal_title" content="Jornal de Epigenética Clínica"> <meta name="citation_title" content="Alterations of DNA methylation seem to be an early event in the development of tumors from the upper aero digestive tract"> <meta name="citation_author" content="Sheila Coelho Soares Lima Brazilian National Cancer Institute–INCA" /> <meta name="citation_author" content="Brazil" /> <meta name="citation_year" content=""> <meta name="citation_volume" content="7"> <meta name="citation_issue" content="3"> <meta name="citation_abstract" content="Extended Abstract Introduction: Statement of the Problem: Tumors from the upper aerodigestive tract (UADT) rank among the 10 most frequent neoplasias worldwide. These tumors are more prevalent in developing countries, arising from a squamous epithelium and are usually associated with tobacco, alcohol consumption and HPV infection. The most common histological type is squamous cell carcinoma and the most commonly affected sub sites include larynx, oral cavity, pharynx and esophagus. Although they share similarities, UADT cancer comprises a group of neoplasias with high clinical and phenotypic heterogeneity and inspite of the recent advances in the identification of biomarkers and new therapeutic targets, no significant gains in overall survival have been observed. Between the associated causes, the development of second primary tumors in the UADT stands out. It is hypothesized that the squamous epithelium lining the affected organs goes through a process known as cancerization field, in which different morphologically normal areas acquire molecular alterations, making them prone to become neoplastic. Based on this, we have been interested in understanding the epigenetic mechanisms that lead to the development of each of these tumors. Methodology & Theoretical Orientation: Microarrays have been used to determine the DNA methylation signature of UADT tumors with further validation by pyro-sequencing in independent samples. Findings: Interestingly, we showed that each subtype of UADT cancer carries a specific DNA methylation signature. They differ in terms of hyper/hypomethylation frequency; affected genomic regions, genes and pathways and transcription factor networks. We have also shown that aberrant DNA methylation of genes involved in epithelium protection and in apoptosis control is an early event in the development of UADT tumors. Therefore, our data indicates that these neoplasias show an epigenetic convergence with respect to early changes, but also diverge in terms of carcinogenic pathways, which may have an impact on prognosis and response to therapy Recent Publications1. Degli Esposti D, et al. (2017) Unique DNA methylation signature in HPV-positive head and neck squamous cell carcinomas. Genome Medicine 9:33. 2. Herceg Z, et al. (2017) Roadmap for investigating epigenome deregulation and environmental origins of cancer. International Journal of Cancer 142(5): 874-882. 3. Gonzaga I M, et al. (2017) TFF1 hypermethylation and decreased expression in esophageal squamous cell carcinoma and histologically normal tumor surrounding esophageal cells. Clinical Epigenetics 9:130. 4. Lima S, et al. (2011) Identification of a DNA methylome signature of esophageal squamous cell carcinoma and potential epigenetic biomarkers. Epigenetics 6(10):1217-1227. 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</div> </div> </header>   <section class="py-4"> <div class="container"> <div class="row"> <div class="col-lg-8"> <h2 class="heading-journals">Abstrato</h2> <h2>Alterations of DNA methylation seem to be an early event in the development of tumors from the upper aero digestive tract</h2> <p> <i class="fas fa-user"></i> Sheila Coelho Soares Lima Brazilian National Cancer Institute–INCA, Brazil </p> <p><p>Extended Abstract<br /> Introduction:<br /> Statement of the Problem: Tumors from the upper aerodigestive tract (UADT) rank among the 10 most frequent<br /> neoplasias worldwide. These tumors are more prevalent in developing countries, arising from a squamous epithelium<br /> and are usually associated with tobacco, alcohol consumption and HPV infection. The most common histological type<br /> is squamous cell carcinoma and the most commonly affected sub sites include larynx, oral cavity, pharynx and<br /> esophagus. Although they share similarities, UADT cancer comprises a group of neoplasias with high clinical and<br /> phenotypic heterogeneity and inspite of the recent advances in the identification of biomarkers and new therapeutic<br /> targets, no significant gains in overall survival have been observed. Between the associated causes, the development of<br /> second primary tumors in the UADT stands out. It is hypothesized that the squamous epithelium lining the affected<br /> organs goes through a process known as cancerization field, in which different morphologically normal areas acquire<br /> molecular alterations, making them prone to become neoplastic. Based on this, we have been interested in<br /> understanding the epigenetic mechanisms that lead to the development of each of these tumors. Methodology &<br /> Theoretical Orientation: Microarrays have been used to determine the DNA methylation signature of UADT tumors<br /> with further validation by pyro-sequencing in independent samples.<br /> Findings: Interestingly, we showed that each subtype of UADT cancer carries a specific DNA methylation signature.<br /> They differ in terms of hyper/hypomethylation frequency; affected genomic regions, genes and pathways and<br /> transcription factor networks. We have also shown that aberrant DNA methylation of genes involved in epithelium<br /> protection and in apoptosis control is an early event in the development of UADT tumors. Therefore, our data indicates<br /> that these neoplasias show an epigenetic convergence with respect to early changes, but also diverge in terms of<br /> carcinogenic pathways, which may have an impact on prognosis and response to therapy<br /> Recent Publications1. Degli Esposti D, et al. (2017) Unique DNA methylation signature in HPV-positive head and<br /> neck squamous cell carcinomas. Genome Medicine 9:33. 2. Herceg Z, et al. (2017) Roadmap for investigating<br /> epigenome deregulation and environmental origins of cancer. International Journal of Cancer 142(5): 874-882. 3.<br /> Gonzaga I M, et al. (2017) TFF1 hypermethylation and decreased expression in esophageal squamous cell carcinoma<br /> and histologically normal tumor surrounding esophageal cells. Clinical Epigenetics 9:130. 4. Lima S, et al. (2011)<br /> Identification of a DNA methylome signature of esophageal squamous cell carcinoma and potential epigenetic<br /> biomarkers. Epigenetics 6(10):1217-1227.</p> </p> <div class="alert alert-info text-left"><b>Isenção de responsabilidade:</b> Este resumo foi traduzido usando ferramentas de inteligência artificial e ainda não foi revisado ou verificado</div> <div class="nav social-icons align-items-center"> <p class="m-0">Compartilhe este artigo:</p> <a class="facebook" title="Clique aqui" target="_blank" href="https://www.facebook.com/sharer.php?u=https://portuguese.primescholars.com/abstract/alterations-of-dna-methylation-seem-to-be-an-early-event-in-thedevelopment-of-tumors-from-the-upper-aero-digestive-tract-93517.html" rel="noopener"><i class="fab fa-facebook-f"></i></a> <a class="twitter" title="Clique aqui" target="_blank" href="https://twitter.com/share?url=https://portuguese.primescholars.com/abstract/alterations-of-dna-methylation-seem-to-be-an-early-event-in-thedevelopment-of-tumors-from-the-upper-aero-digestive-tract-93517.html" rel="noopener"><i class="fab fa-twitter"></i></a> <a class="linkedin" 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Alterations of DNA methylation seem to be an early event in | 93517