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Histone Variants at the Centromere

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 Chromosomes

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 Chromosomes

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...

Centrioles and Centrosomes

Centrioles and Centrosomes

Most animal cells comprise a pair of centrioles together called a centrosome. The cell duplicates its centrosome and contains two centrosomes side-by-side, which begin to move apart during the prophase. As the centrosomes migrate to two different sides of the cell, microtubules start extending from each centrosome toward the other end. The mitotic spindle is composed of the centrosomes and their emerging microtubules.
Near the end of the prophase, also called late prophase or "prometaphase,"...

Centrosome Duplication

Centrosome Duplication

The primary microtubule organizing center (MTOC) in animal cells is the centrosome. A centrosome has two cylindrical centrioles at its core. Each centriole consists of nine sets of three microtubules held together by proteins. The centrioles are positioned at right angles to each other and surrounded by a shapeless protein cloud called the pericentriolar matrix, or pericentriolar material (PCM).
To ensure that each daughter cell receives a centrosome after cell division, centrosome duplication...

Centrosome Duplication

Centrosome Duplication

The primary microtubule organizing center (MTOC) in animal cells is the centrosome. A centrosome has two cylindrical centrioles at its core. Each centriole consists of nine sets of three microtubules held together by proteins. The centrioles are positioned at right angles to each other and surrounded by a shapeless protein cloud called the pericentriolar matrix, or pericentriolar material (PCM).
To ensure that each daughter cell receives a centrosome after cell division, centrosome duplication...

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Related Experiment Video

Updated: Jul 5, 2026

Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins

Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins

Published on: March 3, 2016

Centromeres: old tales and new tools.

P Vagnarelli¹, S A Ribeiro, W C Earnshaw

¹Wellcome Trust Centre for Cell Biology, Institute of Cell and Molecular Biology, University of Edinburgh, Swann Building, King's Buildings, Mayfield Road, Edinburgh EH9 3JR, UK. p.vagnarelli@ed.ac.uk

|April 26, 2008

Summary

The centromere is a specialized chromosome region crucial for cell division. This review examines centromere organization, chromatin types, and arrangements impacting mitosis and cell segregation.

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Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins

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Area of Science:

Cell Biology
Genetics
Molecular Biology

Background:

The centromere is essential for eukaryotic chromosome segregation during mitosis.
Kinetochores at the centromere mediate microtubule attachment, chromosome alignment, and checkpoint control.
Centromere function is critical for ensuring accurate distribution of genetic material.

Purpose of the Study:

To analyze the organization of centromeres.
To explore the relationship between centromere structure and chromatin types.
To understand how chromatin arrangements influence centromere function during mitosis.

Main Methods:

Literature review of studies on centromere structure and function.
Analysis of chromatin organization at centromeric regions.
Examination of kinetochore-microtubule interactions.

Main Results:

Centromeres are characterized by specific chromatin types and arrangements.
These organizational features are critical for kinetochore assembly and function.
Centromere structure directly impacts the fidelity of chromosome segregation.

Conclusions:

Centromere organization, including chromatin types and arrangements, is fundamental to accurate mitosis.
Understanding centromere structure provides insights into chromosome segregation mechanisms.
Further research into centromere chromatin is vital for comprehending cell division.