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Creación de una levadura funcional de un solo cromosoma

Yangyang Shao1,2, Ning Lu1,2, Zhenfang Wu3

  • 1Key Laboratory of Synthetic Biology, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China.

Nature
|August 3, 2018
PubMed
Resumen
Este resumen es generado por máquina.

Los científicos crearon una levadura de un solo cromosoma mediante la fusión de dieciséis cromosomas. Este cromosoma gigante sostiene la vida pero afecta el crecimiento y la viabilidad de la levadura, ofreciendo información sobre la evolución de los cromosomas.

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Área de la Ciencia:

  • Biología sintética
  • La genómica
  • Biología celular

Sus antecedentes:

  • Los genomas eucariotas suelen estar organizados en múltiples cromosomas.
  • La estructura del cromosoma es crucial para la estabilidad y función del genoma.
  • La comprensión de la organización cromosómica proporciona una visión de la evolución.

Objetivo del estudio:

  • Diseñar una levadura funcional de un solo cromosoma a partir de una Saccharomyces cerevisiae de varios cromosomas.
  • Investigar el impacto de la reducción del número de cromosomas en la estructura y función del genoma.
  • Explorar la evolución de los eucariotas con respecto a la estructura y función de los cromosomas.

Principales métodos:

  • Utilizó fusiones cromosómicas sucesivas de extremo a extremo en Saccharomyces cerevisiae.
  • Se realizaron deleciones de centrómeros dirigidas para lograr la reducción del número de cromosomas.
  • Analizó los cambios en la estructura tridimensional del genoma global utilizando varias técnicas.
  • Comparación de los perfiles transcriptómicos y fenómicos de las levaduras monocromosómicas y de tipo silvestre.

Principales resultados:

  • Creó con éxito una cepa viable de levadura de un solo cromosoma a partir de dieciséis cromosomas nativos.
  • Se observaron alteraciones significativas en la estructura tridimensional del genoma debido a la fusión cromosómica.
  • Encontramos perfiles de transcriptomas casi idénticos entre las levaduras de un solo cromosoma y las de tipo salvaje.
  • Se han observado perfiles de fenómenos similares, pero reducido el crecimiento, la competitividad y la viabilidad de la cepa modificada.

Conclusiones:

  • Un cromosoma único funcional puede apoyar la vida celular eucariota.
  • La reducción del número de cromosomas altera drásticamente la arquitectura del genoma, pero no la expresión génica global.
  • Este enfoque de biología sintética ofrece una nueva forma de estudiar la evolución y la función de los cromosomas.