Dra. María Teresa Roldán. (Univ. Córdoba)
Jueves, 6 de junio de 2019. 12:00 h
Salón de Grados cicCartuja2
Base excision repair (BER) is a crucial defense pathway that replaces damaged DNA bases. It is a multistep process initiated by DNA glycosylases, small enzymes that excise the altered base and generate an intermediate that must be processed by additional proteins before repair is completed. BER has been extensively studied in bacteria, yeast, and mammals.
Results obtained so far in plants indicate that they share many BER components with other organisms, but possess some distinctive features. Among other BER innovations, plants have evolved an unique family of large DNA glycosylases that excise 5-methylcytosine (5-meC), allowing its replacement with unmethylated C. These enzymes, typified by Arabidopsis ROS1 and DME, initiate a BER-based, active DNA demethylation pathway that prevents hypermethylation and plays important functions in genome imprinting and seed development. After 5-meC excision, ROS1/DME proteins incise the sugar-phosphate backbone, generating single nucleotide gaps with non-canonical 3´-ends that are processed by additional BER enzymes, such as APE1L and ZDP. Another repair-related factor, DDB2, avoids accumulation of potentially harmful DNA demethylation intermediates and coordinates methylation and demethylation activities.
Thus, beyond its canonical role in genome maintenance, the plant DNA repair machinery performs critical functions in epigenetic regulation.
Javier Rojo (IIQ) participa en los estudios in vitro de una macropartícula capaz de bloquear al virus
El objetivo es facilitar el intercambio de información entre grupos de investigación y empresas asociadas al círculo.
En su decimoquinta el cicCartuja organiza un Café con Ciencia y la Jornada Futuros Científicos
La cita sobre “Nanotecnologías, Materiales avanzados y Nuevas formas de producción y proceso” se celebrará el 10 noviembre 2014
Dos trabajos liderados por investigadores del cicCartuja, reconocidos por su alto impacto tecnológico
Un estudio con participación del IBVF identifica un nuevo elemento que participa en el circuito de regulación génica de las cianobacterias
Los científicos acercarán su investigación a la ciudadanía desde las 18 h del próximo 25 de septiembre en la Plaza Nueva