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Igualdad de los sexos: encontrada en la traducción
Partho Sarothi Ray1, Paul L Fox
1Department of Cell Biology, The Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA.
Cell
|August 27, 2005
Resumen
La compensación de la dosis de genes asegura niveles iguales de proteínas ligadas a X en las moscas de la fruta macho. Un nuevo mecanismo de silenciamiento de traducción en dos etapas previene la síntesis de un activador específico masculino en las hembras, asegurando que la compensación se produzca solo en los machos.
Área de la Ciencia:
- Genética La genética.
- Biología Molecular Biología Molecular
- Biología del desarrollo Biología del desarrollo.
Sus antecedentes:
- La determinación del sexo en muchas especies, incluidas las moscas de la fruta y los humanos, implica complementos cromosómicos sexuales diferenciales (los machos suelen tener un cromosoma X, las hembras tienen dos).
- A pesar de la diferencia en el número de cromosomas X, los machos y las hembras a menudo exhiben niveles de expresión similares de genes vinculados a X, un fenómeno conocido como compensación de dosis génica.
- Los mecanismos moleculares precisos que subyacen a la compensación de la dosis génica son complejos y varían según las especies.
Objetivo del estudio:
- Para aclarar el mecanismo de la compensación de la dosis de genes específicos del sexo en las moscas de la fruta.
- Para identificar los actores moleculares involucrados en la regulación de la expresión génica vinculada a X.
Principales métodos:
- Análisis de los patrones de expresión génica en moscas de la fruta macho y hembra.
- Investigación de la síntesis de proteínas y la regulación traslacional.
- Identificación de los factores reguladores clave involucrados en el mecanismo de silenciamiento.
Principales resultados:
- Se identificó un mecanismo único de silenciamiento de la traducción en dos etapas.
- Este mecanismo se dirige específicamente a un activador de transcripción específico del macho en las moscas hembras.
- El silenciamiento asegura que la compensación de la dosis de genes se produzca exclusivamente en los machos.
Conclusiones:
- Los hallazgos revelan una nueva vía reguladora para la compensación de la dosis de genes.
- Este mecanismo asegura un control preciso de la expresión génica ligada al gen X en función del sexo.
- El estudio proporciona información sobre la evolución de los procesos regulatorios específicos del sexo.
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01:31Translation
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Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
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02:45The Ratio of X Chromosome to Autosomes
In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.
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Translation Produces the Building Blocks of Life
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
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01:31Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
Proteins are called the...
Translation Produces the Building Blocks of Life
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