Video Experimental Relacionado
Updated: Jun 26, 2026
04:06
Efficient and Cost Effective Electroporation Method to Study Primary Cilium-Dependent Signaling Pathways in the Granule Cell Precursor
Published on: November 30, 2021
La señalización del erizo en el ratón requiere proteínas de transporte intraflagelares
Danwei Huangfu1, Aimin Liu, Andrew S Rakeman
1Developmental Biology Program, Sloan-Kettering Institute, 1275 York Avenue, New York, New York 10021, USA.
Nature
|November 7, 2003
Resumen
Las proteínas de transporte intraflagellar (IFT) son cruciales para la señalización de Sonic hedgehog (Hedgehog) en el desarrollo de los vertebrados. Este estudio identifica nuevos mutantes de ratón que afectan a las proteínas IFT, revelando su papel esencial en el patrón embrionario y la transducción de señales de Hedgehog.
Área de la Ciencia:
- Biología del desarrollo Biología del desarrollo.
- Biología celular Biología celular.
- Genética La genética.
Sus antecedentes:
- Las proteínas de transporte intraflagelar (IFT) son vitales para el ensamblaje y la función de las flagelas, identificadas inicialmente en Chlamydomonas reinhardtii.
- La señalización sónica del erizo (Hedgehog) es una vía crítica para el patrón y el desarrollo embrionario.
Objetivo del estudio:
- Investigar el papel de las proteínas IFT en el desarrollo embrionario de los vertebrados y en las vías de señalización.
- Identificar y caracterizar nuevos mutantes de ratón que afectan a las proteínas IFT y su impacto en la señalización de Hedgehog.
Principales métodos:
- Pantalla de mutagénesis de etilnitrosourea en ratones para identificar mutantes de patrones embrionarios.
- Análisis genético de mutantes identificados (wimple y flexo) para determinar los genes IFT afectados.
- Evaluación funcional de las proteínas IFT (Wim, Polaris, Kif3a) en la vía de señalización de Hedgehog.
Principales resultados:
- Se identificaron dos nuevos mutantes de ratón, wimple (wim) y flexo (fxo), con defectos en los tipos de células neuronales ventrales.
- Las mutaciones en wim y fxo interrumpen las proteínas IFT, específicamente los homólogos IFT172 e IFT88 respectivamente.
- Las proteínas IFT (Wim, Polaris, Kif3a) son esenciales para la señalización de Hedgehog aguas abajo de Patched1 y aguas arriba de la activación del gen objetivo.
Conclusiones:
- El estudio demuestra un papel esencial y específico para los vertebrados para la maquinaria IFT en la transducción de señales de Hedgehog.
- Las proteínas IFT son reguladores críticos del patrón embrionario a través de su participación en la señalización del erizo.
Videos de Conceptos Relacionados
01:32Microtubule Associated Motor Proteins
Eukaryotic cells have different motor proteins for transporting various cargo within the cell. These motor proteins differ based on the filament they associate with, the direction they move within the cell, and the type of cargo they transport. Motor proteins that associate with microtubules are known as microtubule-associated motor proteins. There are two families of microtubule-associated motor proteins —Kinesins and Dyneins. Both these proteins assist in the transport of cellular cargos...
01:39Mitochondrial Protein Sorting
Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death. Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
02:33Hedgehog Signaling Pathway
The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...
01:20Cotranslational Protein Translocation
Translocation of proteins across membranes is an ancient process that occurs even in bacteria and archaebacteria. In fact, the components of the translocation machinery are still conserved between prokaryotes and eukaryotes.
Sec61 channel partners for cotranslational translocation
During cotranslational translocation, the Sec61 channel partners with the signal recognition particle (SRP), the signal recognition particle receptor (SR), and the ribosomes to transport the nascent polypeptide chain...
Sec61 channel partners for cotranslational translocation
During cotranslational translocation, the Sec61 channel partners with the signal recognition particle (SRP), the signal recognition particle receptor (SR), and the ribosomes to transport the nascent polypeptide chain...
01:22Microtubules in Signaling
The primary cilium, made up of microtubules, acts as antennae on the cell surfaces for relaying external stimuli into the cells. These fine hair-like structures are present, generally one per cell. These are non-motile cilia in a 9+0 microtubules arrangement, where the central pair of microtubules are absent. The primary cilia arise from the basal body embedded in the cell membrane. Intraflagellar transport (IFT) carries requisite proteins from the cytoplasm to the cilium because the primary...
02:33Hedgehog Signaling Pathway
The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...