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Immunostaining for DNA Modifications: Computational Analysis of Confocal Images
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Edición y metilación en un solo sitio por actividades funcionalmente interdependientes

Mary Anne T Rubio1, Kirk W Gaston1,2, Katherine M McKenney1

  • 1Department of Microbiology, Ohio State Biochemistry Program and The Center for RNA Biology, The Ohio State University, Columbus, Ohio 43210, USA.

Nature
|February 24, 2017
PubMed
Resumen
Este resumen es generado por máquina.

Las modificaciones químicas en los ácidos nucleicos son cruciales pero a menudo mal comprendidas. Este estudio revela que la metilación de la citosina es un requisito previo para la desaminación en el tRNA de Trypanosoma brucei, lo que explica la estabilidad del genoma.

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Área de la Ciencia:

  • Biología molecular
  • La bioquímica
  • La genética

Sus antecedentes:

  • Los ácidos nucleicos poseen más de 100 modificaciones químicas conocidas, que afectan a las bases y azúcares.
  • Las vías de biosíntesis para la mayoría de las modificaciones de ácido nucleico permanecen en gran medida sin aclarar.
  • La reconstitución enzimática in vitro es difícil, lo que sugiere vías de modificación complejas o interdependencia.

Objetivo del estudio:

  • Investigar el mecanismo de edición de citosina a uridina en el ARNt en eucariotas.
  • Para aclarar el papel de la interdependencia de la modificación en la actividad enzimática.
  • Comprender cómo el Trypanosoma brucei mantiene la integridad del genoma a pesar de poseer deaminasas mutagénicas.

Principales métodos:

  • Investigó la modificación de la citosina 32 en el tRNA de Trypanosoma brucei.
  • Actividad enzimática reconstituida in vitro utilizando componentes purificados, incluidos la TRM140 metiltransferasa y la ADAT2/ 3 desaminasa.
  • Coexpresión de la metiltransferasa y la desaminasa para evaluar la actividad enzimática y la mutagenicidad.

Principales resultados:

  • La citosina 32 en T. brucei tRNAThr es metilada a 3-metilcitosina (m3C) por el TRM140.
  • m3C sirve como requisito previo para la posterior desaminación a 3-metiluridina (m3U) por ADAT2/3.
  • La coexpresión de TRM140 y ADAT2/3 suprime la mutagenicidad de ADAT2/3, manteniendo la estabilidad del genoma.

Conclusiones:

  • Se demuestra un modelo de interdependencia de la modificación, donde la metilación precede a la desaminación.
  • Esta vía de modificación secuencial explica la falta de desaminación al por mayor en T. brucei.
  • Los hallazgos proporcionan información sobre la regulación de las deaminasas mutagénicas, incluida la AID humana.