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Vías específicas evitan los reordenamientos del genoma mediados por la duplicación.

Christopher D Putnam¹, Tikvah K Hayes, Richard D Kolodner

¹Ludwig Institute for Cancer Research, Department of Medicine, University of California School of Medicine, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0669, USA.

|July 31, 2009

Resumen

Ciertas regiones del cromosoma de la levadura propensas a la duplicación pueden causar inestabilidad del genoma. Los genes y vías específicas suprimen estos reordenamientos, evitando la inestabilidad genómica generalizada en las células con secuencias de ADN repetitivas.

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Área de la Ciencia:

Genética La genética.
Biología Molecular Biología Molecular
Genética de la levadura Genética de la levadura

Sus antecedentes:

Los genomas eucariotas contienen numerosas secuencias repetidas divergentes.
Comprender los mecanismos de inestabilidad del genoma es crucial para prevenir enfermedades asociadas con mutaciones genéticas.

Objetivo del estudio:

Investigar el papel de regiones cromosómicas específicas en Saccharomyces cerevisiae en la formación de reordenamientos cromosómicos brutos (GCR).
Identificar genes y vías implicadas en la supresión de GCRs mediadas por recombinación homóloga en regiones repetitivas de ADN.

Principales métodos:

Análisis del brazo izquierdo del cromosoma V. de Saccharomyces cerevisiae.
Investigando la región HXT13-DSF1 por su propensión a formar duplicaciones y GCRs.
Evaluar el papel de varios genes (SGS1, TOP3, SRS2, RAD6, SLX1, SLX4, SLX5, MSH2, MSH6, RAD10) y el punto de control de estrés de la replicación del ADN (MRC1, TOF1) en la supresión de las GCR.

Principales resultados:

La región HXT13-DSF1, que contiene homología divergente similar a las duplicaciones segmentarias de mamíferos, fue identificada como "en riesgo" de GCRs mediadas por duplicación.
Se descubrió que numerosos genes y vías están específicamente involucrados en la supresión de estos GCR, que difieren de los que suprimen los GCR mediados por secuencia de copia única.

Conclusiones:

Los mecanismos para la formación y supresión de GCR difieren entre las regiones de ADN repetitivas y de copia única.
Estos hallazgos explican cómo las células eucariotas previenen la inestabilidad extensa del genoma a pesar de contener numerosas secuencias repetidas divergentes.