Video Experimental Relacionado
Updated: May 4, 2026

05:48
A Behavioral Assay for Mechanosensation of MARCM-based Clones in Drosophila melanogaster
Published on: December 30, 2015
9.7K
El control de las funciones del complejo bithorax por el gen de segmentación fushi tarazu de D. melanogaster
Cell
|October 24, 1986
Resumen
Las nuevas mutaciones genéticas de la mosca de la fruta (ftz) alteran el desarrollo del segmento abdominal. Un nuevo modelo sugiere que estas mutaciones ftz surgen de ligeros cambios en el patrón de expresión, lo que afecta la segmentación del cuerpo.
Área de la Ciencia:
- Biología del desarrollo Biología del desarrollo.
- Genética La genética.
- Biología Molecular Biología Molecular
Sus antecedentes:
- El gen *sin fruto* (ftz) es crucial para la segmentación embrionaria en *Drosophila melanogaster*.
- Los alelos específicos *ftz* exhiben efectos únicos en el desarrollo, distintos de las mutaciones nulas.
- Comprender la función *ftz* es clave para descifrar la formación del plano corporal.
Objetivo del estudio:
- Caracterizar las consecuencias del desarrollo de tres alelos *ftz* dominantes.
- Proponer un modelo que explique los distintos fenotipos causados por estos alelos.
- Para investigar el papel de *ftz* en la subdivisión de parasegmentos y la activación de genes.
Principales métodos:
- Análisis de alelos *ftz* dominantes y sus efectos en el desarrollo del segmento abdominal.
- Comparación de fenotipos mutantes con alelos nulos *ftz*.
- Desarrollo de un modelo genético para la función *ftz*.
Principales resultados:
- Los alelos *ftz* dominantes inducen transformaciones del primer segmento abdominal al tercero.
- Estos alelos causan deleciones de segmentos fuera de fase con fenotipos nulos *ftz*.
- Se propone un modelo donde *ftz+* subdivide el cuerpo y regula los genes complejos *bithorax*.
- Los efectos observados se atribuyen a un ligero ensanchamiento de las franjas de expresión *ftz*.
Conclusiones:
- El gen *ftz* juega un doble papel en el establecimiento de la segmentación corporal.
- Los patrones de expresión alterados de *ftz* pueden conducir a defectos específicos del desarrollo.
- El modelo propuesto proporciona un marco para comprender las variaciones alélicas *ftz* y su impacto en el desarrollo.
Más Videos Relacionados
Videos de Conceptos Relacionados
Position-effect Variegation
5.6K
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.
5.6K
Cis-regulatory Sequences
9.5K
Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
9.5K
Combinatorial Gene Control
8.6K
Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
8.6K
The Ratio of X Chromosome to Autosomes
11.5K
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...
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female...
11.5K
Dosage Compensation
6.3K
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...
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...
6.3K
Exon Recombination
3.1K
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...
Exon shuffling follows “splice frame rules.” Each exon...
3.1K

