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Related Concept Videos

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...
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...
Crossing Over01:34

Crossing Over

Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...
Crossing Over01:30

Crossing Over

Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I, duplicated...
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...
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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Computational model of dose response for low-LET-induced complex chromosomal aberrations.

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Related Experiment Video

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Hi-C: A Method to Study the Three-dimensional Architecture of Genomes.
22:27

Hi-C: A Method to Study the Three-dimensional Architecture of Genomes.

Published on: May 6, 2010

Complex interchanges as a complex function of chromosome organisation.

Y A Eidelman1, S G Andreev

  • 1Institute of Biochemical Physics, Russian Academy of Sciences, Kosygin str.4, 119334 Moscow, Russia.

Radiation Protection Dosimetry
|November 27, 2010
PubMed
Summary
This summary is machine-generated.

A novel Monte Carlo technique models human chromosome organization to predict radiation-induced aberrations. While simple aberrations matched data, complex ones were underestimated, suggesting repair factories influence formation.

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Last Updated: Jun 6, 2026

Hi-C: A Method to Study the Three-dimensional Architecture of Genomes.
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Published on: May 6, 2010

Associated Chromosome Trap for Identifying Long-range DNA Interactions
14:49

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Getting an A with the 3Cs: Chromosome Conformation Capture for Undergraduates
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Getting an A with the 3Cs: Chromosome Conformation Capture for Undergraduates

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Area of Science:

  • Biophysics
  • Radiation Biology
  • Cell Biology

Background:

  • Understanding the 3D organization of chromatin within the human lymphocyte interphase nucleus is crucial for predicting DNA damage outcomes.
  • Existing models often simplify chromosome positioning and dynamics, potentially limiting accurate prediction of complex chromosomal aberrations.

Purpose of the Study:

  • To develop and apply a Monte Carlo technique for biophysical modeling of human lymphocyte interphase nucleus structural organization.
  • To simulate radiation-induced chromosomal exchange aberrations (CA) by considering chromatin organization, non-random chromosome localization, and loci dynamics.
  • To analyze the dose-response relationship for simple and complex CA and compare model predictions with experimental mFISH data.

Main Methods:

  • Developed a Monte Carlo technique modeling 46 chromosomes as polymer globules.
  • Incorporated different levels of chromatin organization, non-random chromosome localization, and chromosome loci dynamics.
  • Simulated intra/interchromosomal contacts and calculated distance-dependent interaction probabilities, including DNA break repair.
  • Calculated dose-response for simple and complex CA and compared with mFISH data for human lymphocytes.
  • Recalculated CA yields using the alternative SCD model to assess sensitivity to organizational uncertainty.

Main Results:

  • The Monte Carlo simulation accurately fitted experimental data for simple chromosomal aberration frequencies.
  • Complex chromosomal aberrations were consistently underestimated by the model, even with dense chromosome territory packaging.
  • Recalculation using the SCD model also underestimated complex aberration yields.
  • The underestimation persisted across different models of nuclear organization.

Conclusions:

  • The developed Monte Carlo technique provides a robust framework for modeling chromosome organization and predicting simple radiation-induced aberrations.
  • The underestimation of complex aberrations suggests that current models may not fully capture the mechanisms of their formation.
  • The movement of damaged loci to common DNA repair factories is proposed as a significant, additional mechanism contributing to complex CA formation.