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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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A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
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The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
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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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Updated: Dec 21, 2025

Examination of Mitotic and Meiotic Fission Yeast Nuclear Dynamics by Fluorescence Live-cell Microscopy
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Zooming in on chromosome dynamics.

John K Eykelenboom1, Tomoyuki U Tanaka1

  • 1Centre for Gene Regulation and Expression, School of Life Sciences, University of Dundee , Dundee, UK.

Cell Cycle (Georgetown, Tex.)
|May 14, 2020
PubMed
Summary

CRISPR-Cas9 gene editing allows detailed visualization of chromosome organization in live cells. This technology improves upon traditional methods for studying chromosome dynamics without complex genetic manipulation.

Keywords:
CRISPR-Cas9 technologyChromosome structurechromosome dynamicsfluorescent visualizationlive-cell imaging

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Area of Science:

  • Cell Biology
  • Genetics
  • Molecular Biology

Background:

  • Traditional chromosome organization studies relied on low-resolution, large-scale analyses.
  • Visualizing specific chromosome regions in live cells was previously challenging.

Purpose of the Study:

  • To review traditional chromosome locus visualization methods.
  • To highlight the impact of CRISPR-Cas9 on chromosome organization studies.
  • To discuss novel CRISPR-Cas9 applications for chromosome visualization.

Main Methods:

  • Review of existing literature on chromosome visualization techniques.
  • Discussion of CRISPR-Cas9 gene-targeting for locus visualization.
  • Description of recent CRISPR-Cas9 advancements for simplified visualization.

Main Results:

  • CRISPR-Cas9 enables high-resolution visualization of specific chromosome regions.
  • Gene-targeting methodologies have enhanced chromosome locus visualization.
  • New CRISPR-Cas9 developments simplify visualization without complex genetic engineering.

Conclusions:

  • CRISPR-Cas9 technology revolutionizes the study of chromosome dynamics.
  • Advanced CRISPR-Cas9 tools offer accessible methods for detailed chromosome analysis.
  • This review provides insights into current and future chromosome organization research.