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Polytene Chromosomes02:04

Polytene Chromosomes

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Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
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Chromosome Structure02:40

Chromosome Structure

26.7K
A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
The centromere is a DNA sequence that links sister chromatids. This is also where kinetochores, protein complexes to which spindle microtubules attach, are constructed after the chromosome is replicated. The kinetochores allow the spindle microtubules to move the chromosomes within the cell during cell division.
Telomeres consist of non-coding repetitive nucleotide...
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Lampbrush Chromosomes01:51

Lampbrush Chromosomes

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In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops...
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Chromosome Replication02:31

Chromosome Replication

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Before a cell can divide, it must accurately replicate all of its chromosomes, including the DNA and its associated histone and non-histone proteins.  This process begins at numerous origins of replication during the S phase of the cell cycle in each of a cell’s chromosomes simultaneously. Certain nucleotides can act as origins of replication, but these sequences are not well defined - especially in complex, multi-cellular, eukaryotic species. The length of DNA that spans an origin...
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The Mitotic Spindle02:27

The Mitotic Spindle

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The mitotic spindle—or spindle apparatus—is a eukaryotic, cytoskeletal structure made up of long protein fibers called microtubules. Formed during cell division, the spindle separates sister chromatids and moves them to opposite ends of a parental cell, where the now individual chromosomes are distributed to two daughter cell nuclei.
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures...
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Chromosomal Theory of Inheritance01:39

Chromosomal Theory of Inheritance

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In 1866, Gregor Mendel published the results of his pea plant breeding experiments, providing evidence for predictable patterns in the inheritance of physical characteristics. The significance of his findings was not immediately recognized. In fact, the existence of genes was unknown at the time. Mendel referred to hereditary units as “factors.”
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Updated: Feb 15, 2026

Fluorescent in situ Hybridization on Mitotic Chromosomes of Mosquitoes
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Fluorescent in situ Hybridization on Mitotic Chromosomes of Mosquitoes

Published on: September 17, 2012

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Una vía para la formación de cromosomas mitóticos

Johan H Gibcus1, Kumiko Samejima2, Anton Goloborodko3

  • 1Program in Systems Biology, Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, 368 Plantation Street, Worcester, MA 01605, USA.

Science (New York, N.Y.)
|January 20, 2018
PubMed
Resumen
Este resumen es generado por máquina.

La formación de cromosomas mitóticos implica la pérdida rápida de la organización interfásica y la creación de bucles de cromatina en espiral anidados. Las proteínas de condensina juegan un papel clave en este proceso, con la condensina II esencial para el devanado helicoidal.

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Live Cell Imaging of Chromosome Segregation During Mitosis

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Área de la Ciencia:

  • Biología celular
  • Biología molecular
  • La genética

Sus antecedentes:

  • Los cromosomas mitóticos son estructuras muy compactas esenciales para la división celular precisa.
  • Los mecanismos precisos por los cuales la cromatina de interfase se remodela en cromosomas mitóticos permanecen incompletamente entendidos.
  • Los bucles de cromatina y el papel de los complejos de condensina son críticos en la condensación cromosómica.

Objetivo del estudio:

  • Para aclarar el camino paso a paso de la formación del cromosoma mitótico.
  • Investigar el papel de los complejos de condensina en la organización de los bucles de cromatina durante la mitosis.
  • Comprender el plegamiento jerárquico de la cromatina en estructuras mitóticas compactas.

Principales métodos:

  • Imágenes de células vivas de cultivos de células DT40 sincrónicos.
  • Análisis de captura de conformación cromosómica de alto rendimiento (Hi-C).
  • Simulaciones de polímeros para modelar la organización de la cromatina.

Principales resultados:

  • La organización interfásica se pierde rápidamente en la profase a través de un proceso dependiente de la condensina, formando bucles de 60 kilobases (kb).
  • Durante la prometafase, surgen estructuras de bucles anidados: bucles internos de ~ 80kb dentro de bucles externos de ~ 400kb.
  • La cromatina adopta una disposición helicoidal alrededor de un andamio de condensación central, con giros helicoidales que se expanden hasta ~ 12 megabases.
  • Se identificaron funciones diferenciadas de la condensina I y II, siendo la condensina II crucial para el devanado helicoidal.

Conclusiones:

  • La formación del cromosoma mitótico implica un proceso jerárquico de anidación en bucle y en espiral.
  • Los complejos de condensina, particularmente la condensina II, son reguladores esenciales de la organización de la cromatina durante la mitosis.
  • El estudio revela una vía detallada para el plegamiento del cromosoma mitótico, desde la formación inicial del bucle hasta las estructuras helicoidales a gran escala.