{"id":72230,"date":"2005-10-01T00:00:00","date_gmt":"2005-10-01T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/caracterizacion-de-dominios-funcionales-en-el-nucleolo-de-celulas-politenizadas-de-chironomus-2\/"},"modified":"2005-10-01T00:00:00","modified_gmt":"2005-10-01T00:00:00","slug":"caracterizacion-de-dominios-funcionales-en-el-nucleolo-de-celulas-politenizadas-de-chironomus-2","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/ciencias-de-la-vida\/caracterizacion-de-dominios-funcionales-en-el-nucleolo-de-celulas-politenizadas-de-chironomus-2\/","title":{"rendered":"Caracterizaci\u00f3n de dominios funcionales en el nucleolo de c\u00e9lulas politenizadas de chironomus."},"content":{"rendered":"<h2>Tesis doctoral de <strong> Victoria Rodr\u00edguez Vilari\u00f1o <\/strong><\/h2>\n<p>En c\u00e9lulas politenizadas, como las de las gl\u00e1ndulas salivales de larvas de chironomus, el dna est\u00e1 amplificado formando los cromosomas polit\u00e9nicos, como resultado de la amplificaci\u00f3n lateral de las crom\u00e1tidas hermanas que se mantienen unidas a lo largo de sucesivas rondas de replicaci\u00f3n.Los genes ribos\u00f3micos resultan tambi\u00e9n amplificados y su actividad da luggar a la fonaci\u00f3n de un nucleolo gigante, el llamado \u00abnucleolo de c\u00e9lulas polit\u00e9cnicas\u00bb(ncp),que llega a alcanzar un di\u00e1metro de 10-15 um.Hemos utilizado las ventajas que ofrece este modelo biol\u00f3gico para estudiar algunos aspectos b\u00e1sicos de la organizaci\u00f3n del ncp,contribuyendo a esclarecer problemas pendientes sobre la organizaci\u00f3n funcional del nucleolo.  a nivel ultraestructural, el ncp apareci\u00f3 compuesto \u00fanicamente pro componente fibrilar denso (cfd)y componente granular (cg).No han sido identificados en estos nucleolos los centros fibrilares (cfs).Sin embargo, los cfs s\u00ed est\u00e1n presentes en los nueclolos de c\u00e9lulas nerviosas no polit\u00e9cnicas del mismo individuo.La inexistencia de cfs en el ncp podr\u00eda estar relacionada con los niveles y distribuci\u00f3n de las prote\u00ednas estructurales del nucleolo, que podr\u00eda ser una caracter\u00edstica espec\u00edfica de tipo celular. Alternativamente, podr\u00eda ser consecuencia de la elevada actividad del ncp.Sin embargo , los cfs tampoco aparecieron en el ncp tras el tratamiento con cicloheximida (chm),que inhibe la transcripci\u00f3n nucleolar.El tratamiento con esta droga produjo una reorganizaci\u00f3n o segregaci\u00f3n enlos componentes estructurales del ncp,de modo que el cfc se sit\u00faa en las zonas cercanas al cromosoma y el cg en la periferia.  mediante el microscopio confocal y al microscopio electr\u00f3nico hemos estudiado la distribuci\u00f3n del dna en el ncp.El dna intranucleolar se observ\u00f3 extendido en el cfd, en forma de cromatina descondensada .La organizaci\u00f3n del dna es muy din\u00e1mica ya que,tras el tratamiento con chm, se produce una<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Caracterizaci\u00f3n de dominios funcionales en el nucleolo de c\u00e9lulas politenizadas de chironomus.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Caracterizaci\u00f3n de dominios funcionales en el nucleolo de c\u00e9lulas politenizadas de chironomus. <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Victoria Rodr\u00edguez Vilari\u00f1o <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Complutense de Madrid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 10\/01\/2005<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Francisco Javier Medina D\u00edaz<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Juan  ramon Lacadena  calero <\/li>\n<li>pedro Esponda fernandez (vocal)<\/li>\n<li>nicolas Jouve de la barreda (vocal)<\/li>\n<li>gloria Morcillo ortega (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Victoria Rodr\u00edguez Vilari\u00f1o En c\u00e9lulas politenizadas, como las de las gl\u00e1ndulas salivales de larvas de chironomus, el [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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