<?xml version="1.0" encoding="UTF-8" ?><xb:digital_entity_call xmlns:xb="http://com/exlibris/digitool/repository/api/xmlbeans"><xb:digital_entity><pid>22111</pid><control><label>Importância da variabilidade genética...</label><note>Vaz, Filipa Baltazar da Costa, 1985-</note><ingest_id>ing1859</ingest_id><ingest_name>2010.04_2</ingest_name><entity_type xsi:nil="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/><entity_group xsi:nil="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/><usage_type>VIEW</usage_type><preservation_level>critical</preservation_level><partition_a xsi:nil="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/><partition_b xsi:nil="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/><partition_c xsi:nil="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/><status xsi:nil="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/><creation_date>2010-04-23 17:42:46</creation_date><creator>creator:LSARAM</creator><modification_date>2010-04-23 18:11:36</modification_date><modified_by>super:LSARAM</modified_by><admin_unit>DUL01</admin_unit></control><mds><md shared="false"><mid>27717</mid><description> </description><name>descriptive</name><type>dc</type><value><![CDATA[<?xml version="1.0" encoding="UTF-8"?><record xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" ><dc:language>por</dc:language><dc:type>info:eu-repo/semantics/masterThesis</dc:type><dc:format>application/pdf</dc:format><dc:title>Importância da variabilidade genética de Helicobacter pylori na construção de uma vacina de DNA</dc:title><dc:description>Tese de mestrado, Biologia (Microbiologia Aplicada), 2009, Universidade de Lisboa, Faculdade de Ciências</dc:description><dcterms:abstract>A bactéria gram-negativa Helicobacter pylori coloniza o estômago de cerca de 50% da população mundial e está associada ao desenvolvimento de patologias gástricas como a gastrite, úlcera péptica, neoplasia gástrica e linfoma de MALT. As estratégias de erradicação desta infecção baseiam-se em terapias com antimicrobianos, que apresentam limitações dado o aumento da resistência a antibióticos e a possibilidade de re-infecção após o tratamento. Nesta perspectiva, é relevante o desenvolvimento de uma vacina profiláctica e terapêutica que possa representar a variabilidade genética da bactéria. No presente trabalho, com base em dados de imunoproteómica e da relevância dos alvos antigénicos no processo de infecção, considerou-se para o desenho de uma vacina de DNA as seguintes cinco proteínas: NapA, HpaA, VacA, HomB e Omp9. De forma a desenhar uma vacina multi-antigénica que inclua estes cinco alvos, foi necessário definir para cada alvo uma região de menor dimensão conservada e rica em epítopos B, T ajudantes e se possível T citotóxicos, estimados por métodos in silico. Dada a ausência de informação quanto à variabilidade genética dos alvos NapA, HpaA e Omp9, foi necessário proceder à sua sequenciação em diversas estirpes de H. pylori associadas a patologias gástricas distintas, previamente amplificadas por PCR e PCR touchdown, respectivamente. Pretende-se desta forma contribuir para a construção de uma vacina de DNA multi-antigénica, baseda em fragmentos conservados e ricos em epítopos B, Th e Tc de cinco proteínas de H. pylori.</dcterms:abstract><dcterms:accessRights>Acesso restrito - UL</dcterms:accessRights><dc:subject>Variabilidade genética</dc:subject><dc:subject>Helicobacter pylori</dc:subject><dc:subject>Vacinas</dc:subject><dc:subject>Teses de mestrado</dc:subject><dc:creator>Vaz, Filipa Baltazar da Costa</dc:creator><dcterms:advisor>Calado, Cecília Ribeiro da Cruz</dcterms:advisor><dcterms:advisor>Dionísio, Francisco Campos Ferreira</dcterms:advisor><dc:date>2009</dc:date><dc:link>http://catalogo.ul.pt/F/?func=item-global&amp;doc_library=ULB01&amp;type=03&amp;doc_number=000574033</dc:link><dcterms:abstract>The gram-negative bacterium Helicobacter pylori colonizes the stomach of about 50% of the worldwide population and is associated with the development of gastric diseases, such as gastritis, peptic ulcer, gastric neoplasia and MALT lymphoma. Eradication strategies of this infection are based in antimicrobial drugs that present limitations due to the growing resistance to antibiotics and the possibility of re-infection after treatment. Therefore, it is relevant the development of a prophylactic and therapeutic vaccine that can represent the genetic variability of the bacteria. In the present work, based on immunoproteomic data and on the importance of the antigenic targets to the process of infection, it was considered for the construction of a DNA vaccine the following five proteins: NapA, HpaA, VacA, HomB and Omp9. To design a multiantigenic vaccine that comprises all the five selected targets, it was necessary to define for each of them, a smaller region conserved and rich in B, T helper and ultimately T citotoxic epitopes, estimated by in silico methods. Due to the lack of information on the genetic variability of the targets NapA, HomB and Omp9, it was necessary to proceed to its sequencing in several strains of H. pylori associated with different gastric pathologies, after PCR and PCR touchdown amplification. It is intended to contribute for the construction of a multi-antigenic DNA vaccine, based on conserved and rich B, T helper and T citotoxic epitopes of five proteins of H. pylori.</dcterms:abstract></record>]]></value></md><md shared="false"><mid>27719</mid><description xsi:nil="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/><name>technical</name><type>text_md</type><value><![CDATA[<?xml version="1.0" encoding="utf-8"?>
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