Skip to main content
Ir a la página de inicio de la Comisión Europea (se abrirá en una nueva ventana)
español es
CORDIS - Resultados de investigaciones de la UE
CORDIS
Contenido archivado el 2024-04-15

STUDIES OF SEGREGATIONAL AND STRUCTURAL STABILITY IN BACILLUS SUBTILIS

Objetivo

DEVELOPMENT OF STABLE CLONING VECTORS IN AN IMPORTANT INDUSTRIAL MICROORGANISM : BACILLUS SUBTILIS. SUCH DEVELOPMENT HAS BEEN HINDERED SO FAR BY SEGREGATIONAL AND STRUCTURAL INSTABILITY OF RECOMBINANT PLASMIDS. INVESTIGATION OF THE MECHANISM OF PLASMID INSTABILITY IS REQUIRED FOR SUCCESSFULL GENETIC ENGINEERING NOT ONLY IN BACILLUS BUT ALSO IN OTHER POTENTIAL INDUSTRIAL GRAM POSITIVE BACTERIA.
The objectives of this project were to investigate the mechanism whereby genetic material is rearranged in, or entirely lost from cells, and based on this knowledge, to develop new systems which allow stable maintenance of foreign genetic material. The host organisms used were Escherichia coli and Bacillus subtilis. Particular emphasis was placed on investigation of the mode of replication of plasmids used as cloning vectors. The relationship between the efficiency of plasmid replication and segregational stability was examined. The fidelity with which certain sequences are duplicated when placed on plasmids which replicate by different mechanisms was evaluated. The stability of foreign genes inserted into different chromosomal locations was also studied.

The mechanism whereby genetic material is rearranged in, or entirely lost from cells was investigated and based on this knowledge, new systems which allow stable maintenance of foreign genetic material were developed. The host organisms used were Escherichia coli and Bacillus subtilis. Particular emphasis was placed on investigation of the mode of replication of plasmids used as cloning vectors. The relationship between the efficiency of plasmid replication and segregational stability was examined. The fidelity with which certain sequences are duplicated when placed on plasmids which replicate by different mechanisms was evaluated. The stability of foreign genes inserted into different chromosomal locations was also studied.

Many plasmids, which are used as cloning vectors in Gram positive bacteria, replicate by a rolling circle type mechanism. This mode of replication was found to be error prone and leads to structural instability at high frequency. Other plasmids, which replicate by a different mechanism, resulted in structural instability at a much lower frequency, making them ideal candidates for cloning vectors. It was found that a decrease in the efficiency with which plasmid replication occurs leads to segregational instability of the plasmid. An alternative to cloning genes on plasmids is to insert them into the chromosome. It was found that genes could be stably maintained in the chromosome of B subtilis. It was also found that genes could be more stably maintained in some chromosomal locations than in others. The main conclusion drawn from these studies is that deoxyribonucleic acid (DNA) replication has a profound effect on the stability of genetic information.
DEVELOPMENT OF STABLE HIGH-LEVEL EXPRESSION VECTORS WHICH WOULD REPLICATE IN BACILLUS WITH A CONSTITUTIVELY LOW AND INDUCIBLE HIGH COPY NUMBER AND A STRONG CONTROLLABLE PROMOTER.

IN PARTICULAR :
1. THE REGION INVOLVED IN THE STABLE MAINTENANCE OF THE BACILLUS ENDOGENOUS PLASMID PBAA1 WILL BE IDENTIFIED.
2. THIS REGION WILL BE COMBINED WITH REPLICONS HAVING A CONSTITUTIVELY LOW BUT INDUCIBLY HIGH COPY NUMBER.
3. IN ORDER TO CONSTRUCT STABLE EXPRESSION VECTORS, THERMOINDUCIBLE PROMOTERS (EITHER HEAT SHOCK PROMOTERS OR PROMOTERS UNDER THE CONTROL OF TEMPERATIVE SENSITIVE REPRESSORS) WILL BE CLONED ONTO THE STABLE REPLICON.

Ámbito científico (EuroSciVoc)

CORDIS clasifica los proyectos con EuroSciVoc, una taxonomía plurilingüe de ámbitos científicos, mediante un proceso semiautomático basado en técnicas de procesamiento del lenguaje natural. Véas: El vocabulario científico europeo..

Para utilizar esta función, debe iniciar sesión o registrarse

Programa(s)

Programas de financiación plurianuales que definen las prioridades de la UE en materia de investigación e innovación.

Tema(s)

Las convocatorias de propuestas se dividen en temas. Un tema define una materia o área específica para la que los solicitantes pueden presentar propuestas. La descripción de un tema comprende su alcance específico y la repercusión prevista del proyecto financiado.

Datos no disponibles

Convocatoria de propuestas

Procedimiento para invitar a los solicitantes a presentar propuestas de proyectos con el objetivo de obtener financiación de la UE.

Datos no disponibles

Régimen de financiación

Régimen de financiación (o «Tipo de acción») dentro de un programa con características comunes. Especifica: el alcance de lo que se financia; el porcentaje de reembolso; los criterios específicos de evaluación para optar a la financiación; y el uso de formas simplificadas de costes como los importes a tanto alzado.

CSC - Cost-sharing contracts

Coordinador

UNIVERSITY OF DUBLIN
Aportación de la UE
Sin datos
Dirección
TRINITY COLLEGE DEPT.OF GENETICS
DUBLIN 2
Irlanda

Ver en el mapa

Coste total

Los costes totales en que ha incurrido esta organización para participar en el proyecto, incluidos los costes directos e indirectos. Este importe es un subconjunto del presupuesto total del proyecto.

Sin datos

Participantes (1)

Mi folleto 0 0