Análisis del patrón de expresión de genes implicados en el desarrollo Gonadal de Xenopus Tropicalis
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2018-03-16
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Jaén: Universidad de Jaén
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[ES] El desarrollo gonadal es uno de los aspectos más interesantes de la biología del desarrollo, ya que el primordio gonadal es el único primordio indiferenciado con la capacidad de escoger entre dos rutas de diferenciación bien distintas, de las que dependerá el sexo fenotípico del individuo. Que la gónada se diferencie como ovario o como testículo depende de una señal inicial, conocida como determinación del sexo, que será la que ponga en marcha el proceso de diferenciación gonadal. A pesar de la importancia de la determinación del sexo, los mecanismos moleculares implicados son una incógnita en la mayoría de vertebrados.
El gen DM-W de X. laevis, parálogo de DMRTl, no está presente en X. tropicalis y solo se ha encontrado en algunas especies del género Xenopus. Esta distribución indica que debe tratarse de un gen de reciente adquisición, posterior a la separación de los linajes que dieron lugar a las especies del género con un número cromosómico múltiplo de 20 (entre las que se encuentra X. tropicalis y para las que se propone establecer el género Silurana) y aquellas con n múltiplo de 18 (entre las que se encuentra X.
laevis).
[EN] Gonadal development is one of the most interesting aspects of developmental biology, considering that the gonadal primordium is the only undifferentiated primordium with the ability to choose between two very distinct pathways, on which the phenotypic sex of the individual will depend. The gonad differentiates as ovary or testis depending on an initial signal, known as sex determination, which will initiate the process of gonadal differentiation. Despite the importance of sex determination, the molecular mechanisms involved are unknown in most vertebrates. The DM-W gene of X. laevis, a DMRTl analogue, is not present in X. tropicalis and has only been found in sorne species of the genus Xenopus. This distribution indicates that this gene must be of recent acquisition that appeared after the separation of the lineages that gave rise to the species of the genus with a number of chromosomes multiple of 20 (such as X. tropicalis and other species for which the genus Silurana is proposed) and other species with n multiple of 18 (including X. laevis).
[EN] Gonadal development is one of the most interesting aspects of developmental biology, considering that the gonadal primordium is the only undifferentiated primordium with the ability to choose between two very distinct pathways, on which the phenotypic sex of the individual will depend. The gonad differentiates as ovary or testis depending on an initial signal, known as sex determination, which will initiate the process of gonadal differentiation. Despite the importance of sex determination, the molecular mechanisms involved are unknown in most vertebrates. The DM-W gene of X. laevis, a DMRTl analogue, is not present in X. tropicalis and has only been found in sorne species of the genus Xenopus. This distribution indicates that this gene must be of recent acquisition that appeared after the separation of the lineages that gave rise to the species of the genus with a number of chromosomes multiple of 20 (such as X. tropicalis and other species for which the genus Silurana is proposed) and other species with n multiple of 18 (including X. laevis).