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The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
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Mutations01:35

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Detener las reasignaciones de codón en la naturaleza.

Natalia N Ivanova1, Patrick Schwientek1, H James Tripp1

  • 1Department of Energy Joint Genome Institute (DOE JGI), Walnut Creek, CA 94598, USA.

Science (New York, N.Y.)
|May 24, 2014
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Resumen

El estudio encontró variaciones generalizadas del código genético, incluidas las reasignaciones de codones de parada, en muestras ambientales. Esto pone de relieve la diversidad de los códigos genéticos y los posibles conflictos entre fagos y huéspedes debido a estas diferencias.

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Área de la Ciencia:

  • Genética La genética.
  • Microbiología Microbiología.
  • La bioinformática es la bioinformática.

Sus antecedentes:

  • El código genético canónico se considera altamente conservado a lo largo de la vida.
  • Pocas excepciones al código genético estándar han sido documentadas anteriormente.

Objetivo del estudio:

  • Investigar la prevalencia y el alcance de las variaciones del código genético en organismos ambientales.
  • Para identificar casos de reasignación de codones de parada en los datos metagenómicos.

Principales métodos:

  • Análisis de 5.6 billones de pares de bases de datos metagenómicos.
  • Escaneo para eventos de reasignación de codones de parada, específicamente codones de ópalo y ámbar.
  • Examen de más de 1700 muestras ambientales.

Principales resultados:

  • Una fracción sustancial de las muestras ambientales exhibieron eventos de recodificación.
  • Se observaron extensas reasignaciones de codones de parada de ópalo y ámbar en bacteriófagos.
  • La reasignación del codón de parada de ópalo también se detectó en bacterias.

Conclusiones:

  • Los bacteriófagos pueden infectar a los huéspedes con diferentes códigos genéticos, lo que lleva al antagonismo.
  • La diversidad de códigos genéticos en la naturaleza requiere una cuidadosa consideración de la biología sintética.
  • Los organismos modificados con códigos genéticos alterados deben tener en cuenta las variaciones naturales para evitar el intercambio genético no intencionado.