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An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations
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Una proteína quinasa codificada por el gen de respuesta del complejo t causa la herencia no mendeliana
B G Herrmann1, B Koschorz, K Wertz
1Max-Planck-Institute of Immunobiology, Freiburg, Germany. herrmann@immunbio.mpg.de
Nature
|January 26, 2000
Resumen
Los haplotipos t del ratón distorsionan la herencia a través de la disfunción del esperma. El gen Tcr rescata a estos espermatozoides t, confiriendo una ventaja de fertilización y impulsando la transmisión no mendeliana, impactando las relaciones sexuales.
Área de la Ciencia:
- Genética La genética.
- Biología Reproductiva Biología Reproductiva.
- Biología Molecular Biología Molecular
Sus antecedentes:
- Los haplotipos t de ratón en el cromosoma 17 exhiben patrones de transmisión distorsionados.
- Los loci de distorsión / esterilidad en los haplotipos t perjudican la función flagelar del esperma.
- Un locus de respuesta, Tcr, rescata el espermatozoide t, proporcionando una ventaja de fertilización competitiva.
Objetivo del estudio:
- Para identificar y caracterizar el gen Tcr.
- Para dilucidar el mecanismo molecular del rescate de esperma mediado por Tcr.
- Para entender el papel de Tcr en la distorsión de transmisión del haplotipo t.
Principales métodos:
- La clonación posicional se utilizó para aislar el gen Tcr.
- Análisis de la expresión génica durante la espermiogénesis.
- Estudios funcionales que involucran construcciones transgénicas Tcr.
Principales resultados:
- Tcr fue identificado como una nueva familia de genes de la proteína quinasa, Smok, expresada tarde en la espermiogénesis.
- Las quinasas de humo están implicadas en una cascada de señales que regulan la motilidad de los espermatozoides.
- Tcr exhibe una reducción de la actividad de la quinasa, lo que podría contrarrestar los efectos del locus distorsionador.
- Los transgenes Tcr inducen una transmisión no mendeliana y una distorsión de la relación de sexo.
Conclusiones:
- Tcr es un componente clave del sistema de haplotipo t, mediando el rescate de esperma y la distorsión de la transmisión.
- La familia de genes Smok juega un papel crucial en la regulación de la función del esperma y la herencia.
- La actividad única de la cinasa de Tcr es fundamental para su función tanto en la competencia de espermatozoides como en el impulso meiotico.
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