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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 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...

Chromatin Position Affects Gene Expression

Chromatin Position Affects Gene Expression

Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area.
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the timing and level of...

Position-effect Variegation

Position-effect Variegation

In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.

Euchromatin

Euchromatin

The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...

Euchromatin

Euchromatin

The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...

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Related Experiment Video

Updated: Jun 28, 2026

Preparation of Drosophila Polytene Chromosome Squashes for Antibody Labeling

Preparation of Drosophila Polytene Chromosome Squashes for Antibody Labeling

Published on: February 9, 2010

Gene expression in polytene nuclei.

Petra Björk¹, Lars Wieslander

¹Department of Molecular Biology and Functional Genomics, Stockholm University, Stockholm, Sweden.

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

|October 28, 2008

Summary

Investigating gene expression in eukaryotic cells requires analyzing intranuclear steps. This study uses polytene nuclei to visualize and analyze gene-specific messenger ribonucleoprotein (mRNP) complexes during transcription and export.

Area of Science:

Molecular Biology
Cell Biology
Genetics

Background:

Gene expression in eukaryotes involves coordinated, quality-controlled steps like transcription, pre-messenger RNA (mRNA) processing, and export.
Dynamic interactions between transcription, processing, surveillance, and export machineries regulate these steps.
Understanding the molecular interactions and nuclear locations of these processes remains incomplete.

Purpose of the Study:

To analyze the intranuclear steps of gene expression in vivo.
To investigate the structure and composition of active chromatin and gene-specific pre-messenger ribonucleoprotein (mRNP) complexes.
To develop methods for studying gene expression in the context of polytene nuclei.

Main Methods:

Utilizing polytene nuclei for structural analysis of chromosomes and genes during transcription.

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Last Updated: Jun 28, 2026

Preparation of Drosophila Polytene Chromosome Squashes for Antibody Labeling

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Visualizing and analyzing gene-specific pre-mRNPs/mRNPs as they are synthesized on genes.

Tracking the path of pre-mRNPs/mRNPs from synthesis to the cytoplasm.

Main Results:

Polytene nuclei provide a unique system for in situ structural analysis of active chromatin and gene expression.
Methods were established to visualize and analyze gene-specific pre-mRNPs/mRNPs during their synthesis and transport.
The study provides insights into the dynamic interactions governing gene expression within the nucleus.

Conclusions:

Polytene nuclei are valuable for studying the spatiotemporal dynamics of gene expression in vivo.
The described methods facilitate detailed analysis of chromatin structure and mRNP biogenesis.
Further research using these methods can elucidate the intricate mechanisms of eukaryotic gene regulation.