Video Experimental Relacionado
Updated: Aug 6, 2026

04:27
Live-cell Imaging of Sensory Organ Precursor Cells in Intact Drosophila Pupae
Published on: May 27, 2011
Los nanos del gen del grupo posterior de Drosophila funcionan reprimiendo la actividad de la jorobada
Nature
|April 20, 1989
Resumen
Los determinantes posteriores maternos en embriones de Drosophila, como los nanos (nos), son cruciales para el desarrollo del segmento abdominal. La eliminación de la actividad génica nos puede ser compensada por la eliminación de la actividad materna jorobada (hb), lo que sugiere que nos reprime hb.
Área de la Ciencia:
- Biología del desarrollo Biología del desarrollo.
- Genética La genética.
- Biología Molecular Biología Molecular
Sus antecedentes:
- El desarrollo embrionario de Drosophila depende de los determinantes maternos para la formación del plan corporal.
- La polaridad del eje anterior-posterior (AP) y la expresión génica de segmentación dependen de estos determinantes.
- Si bien se entienden los determinantes anteriores como el bicoide, los determinantes posteriores permanecen menos caracterizados.
Objetivo del estudio:
- Investigar el papel de los genes del grupo posterior en el desarrollo embrionario de Drosophila.
- Para dilucidar la interacción entre los genes nanos (nos) y jorobados (hb) en la formación de patrones posteriores.
Principales métodos:
- Analizando mutaciones en los genes del grupo posterior materno.
- Realización de experimentos de trasplante citoplasmático.
- Investigando los efectos de las deficiencias combinadas de los productos de los genes nos y hb.
Principales resultados:
- Las mutaciones genéticas del grupo posterior materno conducen a la ausencia de segmentos abdominales.
- El producto del gen nanos (nos) actúa como un potencial determinante abdominal.
- La ausencia del producto del gen nos puede rescatarse eliminando la actividad de la jorobada materna (hb).
- Los embriones que carecen tanto de nariz materna como de hb son viables.
Conclusiones:
- El producto del gen nanos (nos) probablemente funciona reprimiendo la actividad de la jorobada materna (hb) en el polo posterior.
- Esta interacción es crítica para establecer el plan corporal y la segmentación correctos en los embriones de Drosophila.
Más Videos Relacionados
Videos de Conceptos Relacionados
Organization of Genes
Overview
Types of RNA
Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
piRNA - Piwi-interacting RNAs
PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...
Experimental RNAi
RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
Transducer Mechanism: Nuclear Receptors
Nuclear receptors, or NRs, are unique transcription factors that regulate gene transcription and affect the cellular pathways involved in reproduction, development, or metabolism. Their ability to be stimulated by small lipophilic ligands and control vital cellular processes makes them ideal drug targets. Nearly 10-15% of currently prescribed drugs target these receptors.
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:
Transcriptional Regulation: Riboswitches
Riboswitches are RNA elements that regulate gene expression by altering their secondary structures in response to specific effector molecules. These elements, located in the leader regions of certain mRNAs, act as transcriptional regulators by toggling between alternative conformations to control downstream gene expression. Riboswitch-mediated regulation is a precise mechanism for modulating biosynthetic pathways, as exemplified by the riboflavin biosynthesis pathway in Bacillus...

