Video Experimental Relacionado
Updated: Aug 6, 2026
04:49
In Vitro Nuclear Assembly Using Fractionated Xenopus Egg Extracts
Published on: September 2, 2008
La remodelación activa de los núcleos somáticos en el citoplasma del huevo por la ATPasa nucleosómica ISWIWI
1Laboratory of Molecular Embryology, Building 18T, Room 106, National Institutes of Health, Bethesda, MD 20892, USA.
Science (New York, N.Y.)
|September 29, 2000
Resumen
Los investigadores identificaron la proteína ISWI como crucial para la remodelación nuclear durante la clonación. Este remodelador de cromatina elimina las proteínas clave, mejorando potencialmente la eficiencia de la clonación y la generación de células madre.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología molecular La biología molecular.
- Biología del desarrollo Biología del desarrollo.
Sus antecedentes:
- La transferencia nuclear de células somáticas (SCNT) para la clonación requiere una importante reprogramación nuclear.
- La reprogramación implica cambios extensos en la estructura de la cromatina, incluida la pérdida y ganancia de proteínas.
Objetivo del estudio:
- Identificar los actores moleculares clave involucrados en la remodelación de la cromatina esencial para el SCNT.
- Para comprender los mecanismos bioquímicos subyacentes a los cambios de arquitectura nuclear durante la clonación.
Principales métodos:
- Reconstitución in vitro del proceso de intercambio nuclear observado en SCNT.
- Pruebas bioquímicas para identificar proteínas que median la remodelación de la cromatina.
Principales resultados:
- La nucleosómica adenosina trifosfatasa (ATPasa) ISWI fue identificada como un factor clave.
- ISWI elimina activamente la proteína de unión TATA de la matriz nuclear.
- Esta acción contribuye a la remodelación global del núcleo.
Conclusiones:
- ISWI juega un papel crítico en la desdiferenciación de los núcleos somáticos para la clonación.
- Comprender la función del ISWI puede mejorar la eficiencia de la clonación y las terapias con células madre.
- Las ideas bioquímicas sobre la remodelación nuclear pueden avanzar en el establecimiento del linaje de células madre.
Más Videos Relacionados
09:22Manipulation and In Vitro Maturation of Xenopus laevis Oocytes, Followed by Intracytoplasmic Sperm Injection, to Study Embryonic Development
Published on: February 9, 2015
06:08Egg Microinjection and Efficient Mating for Genome Editing in the Firebrat Thermobia domestica
Published on: October 20, 2020
Videos de Conceptos Relacionados
01:57Meiosis II
Meiosis II is the second and final stage of meiosis. It relies on the haploid cells produced during meiosis I, each of which contain only 23 chromosomes—one from each homologous initial pair. Importantly, each chromosome in these cells is composed of two joined copies, and when these cells enter meiosis II, the goal is to separate such sister chromatids using the same microtubule-based network employed in other division processes. The result of meiosis II is two haploid cells, each containing...
01:38Fertilization
During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...
01:14Introduction to Nuclear Reprogramming
Nuclear reprogramming is the process of switching gene expression of one cell type to that of another cell type, usually from a differentiated cell state to an undifferentiated cell state. Differentiation occurs during processes such as development and morphogenesis, tissue regeneration, and malignancy. Cells can also be artificially induced to reprogram their gene expression by techniques such as nuclear transfer, induced pluripotency, and cell fusion. Such techniques have many applications in...
01:29Somatic to iPS Cell Reprogramming
Reprogramming alters the gene expression in somatic cells, transforming them into induced pluripotent stem (iPS) cells over several generations. Scientists can reprogram cells by introducing genes for four transcription factors—Oct4, Sox2, Klf4, and c-Myc (OSKM) by viral or non-viral methods. These factors are also known as Yamanaka factors after Shinya Yamanaka, who first generated iPS cells using mouse skin cells. Yamanaka was awarded the Nobel Prize in Physiology or Medicine in 2012 for this...
01:32Chromatin Modification in iPS Cells
Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
01:24Methods of Nuclear Reprogramming
Nuclear reprogramming is a process of transforming one cell type into an unrelated cell type by epigenetic changes that alter the cell’s original gene expression pattern. Such epigenetic changes force cells to express a different set of genes, which play a significant role in inducing transformation into other cell types. Nuclear reprogramming offers applications in reproductive cloning for livestock propagation and regenerative medicine — developing patient-specific cells for injury repair.