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Dos genes esteroideos 21-hidroxilasa se encuentran en la región S murina
Nature
|November 5, 1984
Resumen
La hiperplasia suprarrenal congénita, causada por la deficiencia de 21-hidroxilasa, está relacionada con el complejo mayor de histocompatibilidad. Este estudio identificó dos genes de la 21-hidroxilasa dentro del complejo H-2 del ratón, genes cercanos al complemento.
Área de la Ciencia:
- Genética La genética.
- Inmunología Inmunología.
- La bioquímica es la bioquímica.
Sus antecedentes:
- La deficiencia de 21-hidroxilasa (21-OH) es un trastorno hereditario de la esteroideogénesis que afecta la salud humana.
- Esta condición está genéticamente relacionada con el antígeno leucocitario humano (HLA) y el complejo mayor de histocompatibilidad (MHC).
- Investigaciones recientes identificaron un gen estructural defectuoso, el citocromo P-450C21, como la causa de la deficiencia de 21-OH.
Objetivo del estudio:
- Para investigar la ubicación de los genes de la 21-hidroxilasa dentro del complejo murino H-2, el equivalente de ratón del MHC. humano.
- Para determinar si los genes murinos 21-OH están asociados con otros genes en el complejo H-2.
Principales métodos:
- Utilizó un clon de ADN complementario de la suprarrenal bovina que codificaba una porción de la enzima 21-OH.
- Examinó clones cósmidos superpuestos de la región S del genoma del ratón BALB/c.
Principales resultados:
- Identificó la presencia de dos genes 21-hidroxilasa dentro del complejo H-2 del ratón BALB/c.
- Se encontró que estos genes se encuentran inmediatamente aguas abajo (3') de los genes C4 y Slp.
Conclusiones:
- Los genes murinos de la 21-hidroxilasa se encuentran dentro del complejo H-2, específicamente en la región S.
- Este hallazgo apoya la homología entre los MHC humanos y los de ratón con respecto a la organización génica y sugiere un vínculo genético conservado para los genes de la esteroideogénesis.
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