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Related Concept Videos

Condensins02:15

Condensins

Condensins are large protein complexes that use ATP to fuel the assembly of chromosomes during mitosis. They transform the tangled, shapeless mass of post-interphase DNA into individualized chromosomes by compacting, organizing, and segregating chromosomal DNA.
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
Condensins02:15

Condensins

Condensins are large protein complexes that use ATP to fuel the assembly of chromosomes during mitosis. They transform the tangled, shapeless mass of post-interphase DNA into individualized chromosomes by compacting, organizing, and segregating chromosomal DNA.
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
Cohesins02:20

Cohesins

Cohesin protein complexes are a molecular glue that holds two sister chromatids together. They play an important role both in mitosis and meiosis. In mitosis, all cohesin complexes present on the chromosomes are removed before the start of the anaphase stage.
Cohesin complexes in Meiotic Division
Meiosis involves two distinct rounds of chromosomal segregation and cell divisions— Meiosis I followed by Meiosis II – producing four daughter cells. Meiosis I includes the separation of homologous...
Cohesins02:20

Cohesins

Cohesin protein complexes are a molecular glue that holds two sister chromatids together. They play an important role both in mitosis and meiosis. In mitosis, all cohesin complexes present on the chromosomes are removed before the start of the anaphase stage.
Cohesin complexes in Meiotic Division
Meiosis involves two distinct rounds of chromosomal segregation and cell divisions— Meiosis I followed by Meiosis II – producing four daughter cells. Meiosis I includes the separation of homologous...
Chromosome Structure02:40

Chromosome Structure

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...
Polytene Chromosomes02:04

Polytene Chromosomes

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 regularly...

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Related Experiment Video

Updated: Jun 26, 2026

Super-Resolution Microscopy of the Synaptonemal Complex Within the Caenorhabditis elegans Germline
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Published on: September 13, 2022

Three distinct condensin complexes control C. elegans chromosome dynamics.

Gyorgyi Csankovszki1, Karishma Collette, Karin Spahl

  • 1Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA. gyorgyi@umich.edu

Current Biology : CB
|January 3, 2009
PubMed
Summary

Researchers discovered a new condensin I complex in C. elegans, distinct from the dosage compensation complex. This finding reveals three distinct condensin complexes involved in chromosome segregation and gene regulation.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Condensin complexes are crucial for chromosome structure and segregation in eukaryotes.
  • C. elegans was thought to lack a canonical condensin I, possessing only condensin II and a related complex (condensin I(DC)) for dosage compensation.

Purpose of the Study:

  • To identify and characterize novel condensin complexes in C. elegans.
  • To elucidate the distinct roles of different condensin complexes in chromosome dynamics and gene regulation.

Main Methods:

  • Subunit identification and characterization.
  • Chromosomal localization studies using microscopy.
  • Analysis of condensin complex function in mitosis and meiosis.

Main Results:

  • Discovery of a third condensin complex, condensin I, in C. elegans, with a conserved five-subunit composition.
  • Condensin I functions in chromosome segregation in both sexes, binding autosomes and X chromosomes.
  • Condensin I(DC) specifically regulates X chromosome gene expression in hermaphrodites.
  • Condensin I and II associate with distinct chromosomal regions during mitosis and meiosis.
  • Condensin I localizes to meiotic chromosome cohesion sites prior to segregation.

Conclusions:

  • C. elegans possesses three condensin complexes: one for dosage compensation and two for chromosome segregation.
  • Duplication and divergence of condensin subunits allow adaptation to specialized chromosomal roles.
  • Condensins exhibit versatility, functioning in both gene regulation and chromosome segregation.