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Related Concept Videos

Karyotyping01:17

Karyotyping

Describing the number and physical features of chromosomes can reveal abnormalities that underlie genetic diseases. This description is facilitated by special staining techniques that produce a particular banding pattern on each chromosome. State-of-the-art techniques make this approach even more powerful, enabling the detection of individual genes that cause disease.A Simple Chromosome Staining Technique Provides Valuable Scientific InsightSome genetic diseases can be detected by looking at...
Heterochromatin02:38

Heterochromatin

The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
Heterochromatin02:38

Heterochromatin

The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
Histone Variants at the Centromere02:30

Histone Variants at the Centromere

Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3 variants are also...
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...
Duplication of Chromatin Structure02:05

Duplication of Chromatin Structure

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.
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...

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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

Human chromosomal bands: nested structure, high-definition map and molecular basis.

Maria Costantini1, Oliver Clay, Concetta Federico

  • 1Laboratory of Molecular Evolution, Stazione Zoologica Anton Dohrn, Naples, Italy.

Chromosoma
|October 31, 2006
PubMed
Summary

Researchers uncovered the ordered, nested structure of human chromosomes, revealing how isochores form chromosomal bands. This work defines chromosomal bands at the DNA sequence level, offering a higher resolution than previously possible.

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High-throughput Physical Mapping of Chromosomes using Automated in situ Hybridization
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Related Experiment Videos

Last Updated: Jul 19, 2026

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

High-throughput Physical Mapping of Chromosomes using Automated in situ Hybridization
08:48

High-throughput Physical Mapping of Chromosomes using Automated in situ Hybridization

Published on: June 28, 2012

Deciphering High-Resolution 3D Chromatin Organization via Capture Hi-C
09:32

Deciphering High-Resolution 3D Chromatin Organization via Capture Hi-C

Published on: October 14, 2022

Area of Science:

  • Genomics
  • Molecular Biology
  • Cytogenetics

Background:

  • Human chromosomes exhibit distinct banding patterns (Giemsa and Reverse bands) crucial for cytogenetic analysis.
  • The underlying molecular basis and precise organization of these bands have remained incompletely understood.

Purpose of the Study:

  • To investigate the nested structure and high-definition mapping of human chromosomal bands.
  • To elucidate the molecular basis of these bands using DNA sequence composition.

Main Methods:

  • Analysis of the human genome's isochore structure and its assembly into chromosomal bands.
  • High-resolution mapping of isochores and their correlation with cytogenetic band definitions.
  • Identification of band borders at the DNA sequence level.

Main Results:

  • Established the rules governing the assembly of approximately 3,200 isochores into 850-band and 400-band resolution chromosomal bands.
  • Identified the DNA sequence-level borders of chromosomal bands based on an isochore map.
  • Demonstrated that isochore composition provides a molecular definition for chromosomal bands at 100-kb resolution, surpassing the 2-3 Mb cytogenetic level.

Conclusions:

  • Human chromosomal bands possess a highly ordered, nested mosaic structure.
  • Isochore composition alone can define chromosomal bands, resolving a long-standing question in molecular cytogenetics.
  • This provides a molecular framework for understanding chromosomal organization and banding patterns.