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Conservación de la posición y expresión exclusiva del Xist de ratón del cromosoma X inactivo

N Brockdorff¹, A Ashworth, G F Kay

¹Section of Comparative Biology, MRC Clinical Research Centre, Harrow, UK.

|May 23, 1991

Resumen

La inactivación del cromosoma X de los mamíferos, un proceso que asegura la compensación de la dosis génica, involucra una región genética específica. El gen Xist del ratón, al igual que el XIST humano, se expresa exclusivamente desde el cromosoma X inactivo, apoyando su papel en este fenómeno regulador crucial.

Área de la Ciencia:

Genética La genética.
La epigenética es la epigenética.
Biología de los mamíferos Biología de los mamíferos

Sus antecedentes:

La inactivación del cromosoma X es un proceso regulador clave en las hembras de mamíferos para la compensación de la dosis de genes.
Esta inactivación está controlada por una región específica, el centro de inactivación X (XIC/Xic).
El gen XIST humano, ubicado en la región XIC, se expresa solo desde el cromosoma X inactivo.

Objetivo del estudio:

Para investigar la ubicación y el patrón de expresión del gen Xist del ratón.
Para determinar si el homólogo del gen Xist del ratón al XIST humano juega un papel en la inactivación del cromosoma X.
Para comparar las regiones XIC/Xic y la función del gen XIST/Xist entre humanos y ratones.

Principales métodos:

Cartografía comparativa de la región Xic en ratones.
Análisis de la expresión del gen Xist en un modelo de ratón híbrido interespecífico (Mus spretus/Mus musculus domesticus F1).
Utilizando una translocación T(X;16) 16H para distinguir entre cromosomas X activos e inactivos.

Principales resultados:

El gen Xist del ratón fue mapeado a la región Xic del cromosoma X del ratón.
Se encontró que Xist se expresa exclusivamente desde el cromosoma X inactivo en el modelo de ratón híbrido.
La síntesis cromosómica y la expresión exclusiva de X inactivo se conservaron entre el Xist humano y el Xist del ratón.

Conclusiones:

El gen Xist del ratón se encuentra en la región Xic, análogo al XIC humano.
La expresión exclusiva de Xist desde el cromosoma X inactivo apoya su papel en la inactivación del cromosoma X.
La conservación de la posición y el patrón de expresión cromosómica sugiere un mecanismo compartido para la inactivación del cromosoma X en los mamíferos.

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