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Nas fases iniciais do desenvolvimento embrionário de Drosophila melanogaster há a formação de novo de um epitélio embrionário, através de um processo conhecido como celularização da blastoderme. A partir deste epitélio primário, serão formadas as três camadas germinais através dos movimentos de gastrulação. O principal objectivo do presente trabalho é compreender e caracterizar os mecanismos relacionados com a formação e morfogénese de tecidos epiteliais, usando uma abordagem forward genetics. Tirámos partido de um screen materno feito no laboratório da Dra. Ruth Lehman (NYU, USA), para o braço direito do segundo cromossoma (2R). Deste screen foram isolados seis grupos de complementação e 28 mutantes singleton, com defeitos na formação do soma e da cutícula embrionária. Cinco dos seis grupos de complementação foram já identificados, e as funções dos genes associados envolvem ciclo celular (san), regulação do citoesqueleto (scraps) e adesão intercelular/polaridade (RhoGEF2, DaPKC). Com o isolamento desta última classe de mutantes ficámos confiantes de que o screen materno funcionou, e decidimos focar-nos na nossa colecção de singletons. Dado que tínhamos um elevado número de mutantes para analisar, usámos duas abordagens combinadas para facilmente identificarmos os mutantes potencialmente interessantes: 1) screen em epitélio adulto, e 2) análise de complementação. Oito singleton têm defeitos no olho adulto, e destes foram isolados dois novos grupos de complementação e um novo alelo do gene scraps. Um terceiro grupo de complementação foi isolado, sem defeitos óbvios em epitélio adulto. Neste trabalho apresentamos os resultados do screen em epitélio adulto, análise fenotípica e mapeamento citológico dos novos grupos de complementação identificados</dcterms:abstract><dc:subject>Biologia celular</dc:subject><dc:subject>Células epiteliais</dc:subject><dc:subject>Teses de mestrado</dc:subject><dc:creator>Ferreira, Tânia Catarina Cidade Costa Silva</dc:creator><dcterms:advisor>Martinho, Rui</dcterms:advisor><dcterms:advisor>Thorsteinsdóttir, Sólveig</dcterms:advisor><dc:date>2007</dc:date><dc:link>http://catalogo.ul.pt/F/?func=item-global&amp;doc_library=ULB01&amp;type=03&amp;doc_number=000568806</dc:link><dcterms:abstract>Proper epithelial integrity is essential throughout animal development. During Drosophila melanogaster’s early embryonic development, an epithelium is formed de novo through blastoderm cellularization. Later, this epithelium gives rise to a trilaminar embryo through a process known as gastrulation. In our laboratory we are interested in studying epithelium formation and morphogenesis during Drosophila melanogaster’s early embryonic development. For this purpose, we took advantage of a maternal screen done in the right arm of the second chromosome, in the laboratory of Dr. Ruth Lehmann. From this screen were isolated six complementation groups and 28 singleton mutants with defects in embryonic soma and cuticle formation. Five of the six groups were already identified, and their functions involve cell cycle (san), cytoskeleton regulation (scraps) and cell-cell adhesion/polarity (RhoGEF2, DaPKC). With the isolation of the latter class, we were confident that the maternal screen worked and decided to look into our singleton collection. Since we had a large number of mutants, we used a combined approach to rapidly identify the mutants of interest: 1) an adult epithelium screen, and 2) a complementation analysis. We found that eight singletons have defects in the adult eye, and from these we isolated two new complementation groups and another allele of the scraps gene. Additionally, we isolated a new complementation group, without defects in the adult epithelium Here, we present data about the adult screen, phenotypic analysis and cytological location of the three new complementation groups</dcterms:abstract><dcterms:accessRights>open access</dcterms:accessRights></record>]]></value></md></mds><relations/><stream_ref><file_name>20444_ulfc080601_tm.pdf</file_name><file_extension>pdf</file_extension><mime_type>application/pdf</mime_type><directory_path>/digitool_storage/deposit-master/2009/12/15/file_1/20444</directory_path><file_id xsi:nil="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/><storage_id>1006</storage_id><external_type>-1</external_type><file_size_bytes>6526749</file_size_bytes></stream_ref></xb:digital_entity></xb:digital_entity_call>