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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...

Chromatin Packaging

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...

Forces Acting on Chromosomes

Forces Acting on Chromosomes

During mitosis, chromosome movements occur through the interplay of multiple piconewton level forces. In prometaphase, these forces help in chromosome assembly or congression at the equatorial plane, eventually leading to their alignment at the metaphase plate. The forces acting on the chromosomes are space and time-dependent; therefore, they vary with the position of the chromosomes as the cell progresses through mitosis.
Microtubules and motor proteins exert two types of forces on...

Chromosome Structure

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...

Molecular Models

Molecular Models

Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.

Karyotyping

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Related Experiment Video

Updated: Oct 23, 2025

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

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

Published on: May 6, 2010

Predictive Polymer Models for 3D Chromosome Organization.

Michael Chiang¹, Giada Forte^1,2, Nick Gilbert²

¹SUPA, School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK.

Methods in Molecular Biology (Clifton, N.J.)

|August 20, 2021

Summary

This summary is machine-generated.

This review explores polymer simulations and mechanistic models for understanding eukaryotic chromosome organization. It highlights a new predictive model combining multiple mechanisms to explain chromosome structure and dynamics.

Keywords:

Bridging-induced attraction Chromosome organization HiP-HoP model Polymer simulation

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Last Updated: Oct 23, 2025

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

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Published on: May 6, 2010

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3D Multicolor DNA FISH Tool to Study Nuclear Architecture in Human Primary Cells

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Published on: January 25, 2020

Area of Science:

Computational Biology
Molecular Biology
Genetics

Background:

Eukaryotic chromosome organization is crucial for cellular functions.
Experimental methods alone face challenges in elucidating complex organizational principles.

Purpose of the Study:

To review prevalent mechanistic models of chromosome organization.
To introduce a novel simulation scheme integrating multiple mechanisms into a predictive model.
To discuss key findings from recent simulation studies.

Main Methods:

Review of existing polymer simulation and mechanistic modeling approaches.
Description of a new integrated simulation scheme.
Analysis of simulation results from the past few years.

Main Results:

Identified key models driving chromosome organization.
Presented a unified simulation approach for predictive modeling.
Summarized significant insights gained from computational studies.

Conclusions:

Polymer simulations and mechanistic models are powerful tools for studying chromosome organization.
Integrated predictive models offer a comprehensive approach to understanding chromosome dynamics.
Recent advancements provide deeper insights into the principles governing chromosome structure.