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Un mapa físico de las regiones de ADN que flanquean el gen beta-globina del conejo

A J Jeffreys, R A Flavell

|October 1, 1977

Resumen

Los investigadores mapearon el gen beta-globina del conejo utilizando endonucleasas de restricción e hibridación del ADN. Este análisis reveló una sola copia genética por genoma y determinó su dirección transcripcional.

Área de la Ciencia:

Biología Molecular Biología Molecular
Genética La genética.
La genómica es la genómica.

Sus antecedentes:

Comprender la estructura y organización de los genes de globina es crucial para el estudio de las hemoglobinopatías.
La beta-globina de conejo sirve como un sistema modelo para investigar la regulación y estructura de los genes eucariotas.

Objetivo del estudio:

Para construir un mapa físico del locus del gen beta-globina del conejo.
Para determinar el número de copias del gen beta-globina en el genoma del conejo.
Para determinar la dirección de la transcripción del gen beta-globina.

Principales métodos:

El ADN del hígado de conejo fue digerido con endonucleasas de restricción (Eco RI, Pst I, Kpn I).
Los fragmentos de ADN fueron separados por electroforesis en gel de agarosa y transferidos a filtros de nitrocelulosa (blotting).
La hibridación se realizó utilizando un plásmido etiquetado que contenía una sonda de ADN complementario de beta-globina de conejo (ADNc) (PbetaG1).

Principales resultados:

Un número limitado de fragmentos de ADN de conejo se hibridaron fuertemente con la sonda de ADNc de beta-globina.
La digestión Eco RI arrojó dos fragmentos, mientras que Pst I y Kpn I arrojaron un fragmento cada uno, lo que indica sitios de restricción relativos al gen.
Los experimentos de doble digestión permitieron ordenar los fragmentos, estableciendo un mapa físico de los sitios de restricción alrededor del gen beta-globina.

Conclusiones:

El genoma del conejo contiene una sola copia del gen beta-globina por genoma haploide.
Se estableció un mapa físico del locus del gen beta-globina, incluidos los sitios de escisión de la enzima de restricción.
La dirección de la transcripción para el gen beta-globina del conejo se determinó dentro del mapa físico construido.

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