deadpan, un gen pan-neural esencial que codifica una proteína HLH, actúa como denominador en la determinación del sexo de Drosophila
Video Experimental Relacionado
Updated: Jun 16, 2026
08:03
Maintenance of a Drosophila melanogaster Population Cage
Published on: March 15, 2016
S Younger-Shepherd1, H Vaessin, E Bier
1Howard Hughes Medical Institute, University of California, San Francisco 94143.
Cell
|September 18, 1992
Resumen
El gen deadpan (dpn) actúa como elemento denominador en la determinación del sexo de Drosophila. Esto, junto con el escote (sc+), forma un interruptor genético crucial tanto para la determinación neuronal como para la determinación del sexo.
Área de la Ciencia:
- Biología del desarrollo Biología del desarrollo.
- Genética La genética.
- Biología Molecular Biología Molecular
Sus antecedentes:
- La determinación del sexo de Drosophila se basa en la proporción de cromosomas X:A.
- El gen ligado a X sisterless-b (scute) es un elemento numerador clave.
- Los factores de transcripción tipo HLH juegan un papel en la regulación de los genes.
Objetivo del estudio:
- Para identificar nuevos genes involucrados en la determinación del sexo de Drosophila.
- Para aclarar la función del gen deadpan (dpn) en este proceso.
- Investigar la interacción entre las vías neuronales y de determinación del sexo.
Principales métodos:
- Ensayos de interacción dominante dependientes de la dosis en Drosophila.
- Análisis de la expresión génica, específicamente el Sexo letal (Sxl).
- Examen de los efectos maternos de los genes HLH.
Principales resultados:
- El gen autosómico HLH deadpan (dpn) funciona como un elemento denominador.
- Un desequilibrio en la relación entre el escuto (sc+) y el espacio muerto (dpn+) conduce a la letalidad embrionaria.
- La expresión materna de extramacrocaetas (emc) y sin hijas (da) es vital para la señalización de la relación X:A.
Conclusiones:
- Un cassette de genes HLH, incluyendo dpn, scute, emc y da, forma un interruptor genético crítico.
- Este interruptor es esencial tanto para el desarrollo neuronal como para la determinación del sexo en Drosophila.
- Los hallazgos destacan el papel conservado de las proteínas HLH en los procesos de desarrollo.
Videos de Conceptos Relacionados
02:32Position-effect Variegation
In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
02:27Background and Environment Affect Phenotype
Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
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.
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...
02:50Dosage Compensation
In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with distinct numbers of X chromosomes will have...
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with distinct numbers of X chromosomes will have...
02:32Exon Recombination
The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Exon shuffling follows “splice frame rules.” Each exon has three reading...