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Transposición del elemento Ty: transcriptasa inversa y partículas parecidas a virus.

D J Garfinkel, J D Boeke, G R Fink

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    Este resumen es generado por máquina.

    Se encontró actividad de transcriptasa inversa y partículas parecidas a virus en células de levadura con elementos Ty inducidos. Esto sugiere que los elementos Ty y los retrovirus pueden compartir un origen común, con una transcripción inversa que ocurre dentro de estas partículas.

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    Área de la Ciencia:

    • Biología Molecular Biología Molecular
    • Genética de la levadura Genética de la levadura
    • Retrovirología de la retrovirología.

    Sus antecedentes:

    • Los elementos Ty son retrotransposones que se encuentran en la levadura.
    • La transcriptasa inversa es una enzima crucial para la replicación retroviral.
    • El origen y los mecanismos de replicación de los elementos Ty no se comprenden completamente.

    Objetivo del estudio:

    • Para investigar la presencia y la actividad de la transcriptasa inversa en las células de levadura que contienen elementos Ty.
    • Para caracterizar las partículas parecidas a virus asociadas con la actividad del elemento Ty.
    • Para explorar la relación entre los elementos Ty y los retrovirus.

    Principales métodos:

    • Inducción de elementos Ty promovidos por la galactosa en la levadura.
    • Fraccionamiento celular para aislar los componentes de las partículas.
    • Pruebas para la actividad de la transcriptasa inversa.
    • Análisis de componentes de ARN y proteínas dentro de la fracción de partículas.
    • Microscopía electrónica de las células de levadura.

    Principales resultados:

    • La actividad de la transcriptasa inversa y las partículas parecidas a virus se detectaron exclusivamente en células de levadura con elementos Ty inducidos.
    • La transcriptasa inversa, el ARN de Ty, y una proteína específica de Ty cofraccionada en una fracción de partículas.
    • Este complejo sintetizó un producto homólogo a todo el elemento Ty, lo que indica la transcripción inversa del ARN de Ty dentro de la partícula.
    • Se observaron partículas parecidas a virus, pero parecían no infecciosas, parecidas a partículas intracisternas de tipo A y partículas de copia.

    Conclusiones:

    • El ARN Ty se somete a la transcripción inversa dentro de las partículas parecidas a virus en la levadura.
    • Algunos elementos cromosómicos Ty en la levadura pueden ser defectuosos, ya que no exhiben actividad detectable de la transcriptasa inversa.
    • Los elementos Ty y los retrovirus probablemente comparten un origen evolutivo común.