Related Experiment Video

Updated: Aug 11, 2026

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

High-resolution organization of mouse centromeric and pericentromeric DNA

I Kuznetsova1, O Podgornaya, M A Ferguson-Smith

  • 1Institute of Cytology, RAS, St. Petersburg, Russia. kis@mail.cytspb.rssi.ru

Cytogenetic and Genome Research
|February 18, 2006
PubMed

Insights

This study reveals the complex organization of mouse satellite DNA in centromeric regions. Different satellite DNA families intermingle, with varying methylation patterns, suggesting unknown sequences exist in mouse centromeres.

Area of Science:

  • Genomics and Molecular Biology
  • Epigenetics
  • Chromosome Organization

Background:

  • Satellite DNA (satDNA) plays crucial roles in centromere structure and function.
  • Understanding satDNA organization is key to deciphering chromosome stability and evolution.
  • Mouse centromeres contain diverse satDNA families with distinct genomic distributions.

Purpose of the Study:

  • To investigate the spatial organization of mouse satellite 3 (MS3) and satellite 4 (MS4) DNA.
  • To compare MS3 and MS4 organization with major (MaSat) and minor (MiSat) satellite DNA sequences.
  • To analyze the methylation patterns of these satellite DNA families in centromeric and pericentromeric regions.

Main Methods:

  • Fiber-FISH (Fluorescence In Situ Hybridization) was employed to visualize DNA organization.
  • Analysis of DNA methylation patterns was performed.
  • Estimation of fragment lengths and inter-fragment distances was conducted.

Main Results:

  • MS3 and MS4 intermingle with MaSat and MiSat in a specific pattern within centromeric and pericentromeric regions.
  • GC-rich fragments (MS3, MS4) show less strict distribution than AT-rich fragments.
  • Methylation patterns varied, with GC-rich and pericentromeric regions showing higher methylation; MS4 was most methylated, MiSat least.

Conclusions:

  • Mouse centromeric regions exhibit complex intermingling of different satellite DNA families.
  • Methylation patterns are not uniform across satDNA families and chromosome regions.
  • The study suggests the presence of uncharacterized sequences within the mouse centromere.

More Related Videos

Robust 3D DNA FISH Using Directly Labeled Probes12:16

Robust 3D DNA FISH Using Directly Labeled Probes

Published on: August 15, 2013

Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins05:35

Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins

Published on: March 3, 2016

Related Concept Videos

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...
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...
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...
Chromatin Packaging02:21

Chromatin Packaging

Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter? 
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order structures.
Chromatin Packaging01:32

Chromatin Packaging

Each human somatic cell contains 6 billion base pairs of DNA. Each base pair is 0.34 nm long, meaning each diploid cell contains a staggering 2 meters of DNA. This long DNA strand is packed inside a nucleus measuring only 10-20 microns in diameter with the help of specialized DNA-binding proteins called histones. Together they form a compact DNA-protein complex called chromatin. The chromatin is further compacted into higher-order structures. The highest level of compaction is achieved during...
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...