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Genome-wide Purification of Extrachromosomal Circular DNA from Eukaryotic Cells
Published on: April 4, 2016
¿Hay ADN zurdo en los extremos de los cromosomas de la levadura?
Nature
|March 3, 1983
Resumen
Los tractos poli (GT), conocidos por formar Z-ADN, se encuentran en los cromosomas de la levadura. Este estudio revela que estas secuencias se encuentran en los telómeros, los extremos de los cromosomas, y se agregan al ADN extracromosómico en la levadura.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Genética La genética.
- La bioquímica es la bioquímica.
Sus antecedentes:
- Alternando el copolímero de poli (dGdT). dCdA) se encuentran en los eucariotas.
- Estas secuencias pueden formar el ADN de forma Z de la izquierda in vitro.
- La levadura Saccharomyces cerevisiae posee numerosos tractos poli-GT.
Objetivo del estudio:
- Para investigar las ubicaciones genómicas de los tractos poli (GT) en la levadura.
- Para determinar si estos tractos están asociados con estructuras cromosómicas específicas.
- Para explorar el papel de la poli (dGdT). dCdA) en el ADN extracromosómico de la levadura.
Principales métodos:
- El análisis genómico en Saccharomyces cerevisiae.
- Identificación y cartografía de las ramas de poli (GT).
- Clonado y caracterización del ADN extracromosómico de Tetrahymena en levaduras.
Principales resultados:
- Se identificaron al menos 30 tractos poli (GT) en el genoma de la levadura.
- Se encontró un subconjunto de estos tractos poli (GT) en los telómeros del cromosoma de la levadura.
- Poly ((dGdT . . . también conocido como DGT . Se observó que los tramos de dCdA) se agregan a los extremos del ADNr de Tetrahymena en la levadura.
Conclusiones:
- Los tractos poli (GT) están asociados con los telómeros de la levadura.
- Esto representa el primer vínculo informado entre las secuencias homopolímricas y la estructura cromosómica.
- Los hallazgos sugieren un papel para estos tractos en la biología de los telómeros o en el procesamiento del ADN en la levadura.
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