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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...

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Updated: May 7, 2026

An Efficient Method for Quantitative, Single-cell Analysis of Chromatin Modification and Nuclear Architecture in Whole-mount Ovules in Arabidopsis

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Published on: June 19, 2014

Alternative polyadenylation dynamics shape pollen development at single-cell resolution.

Ziwei Zhao¹, Jiawen Zhou¹, Danhui Zhao¹

¹Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian 361102, China.

|May 5, 2026

Summary

This summary is machine-generated.

Alternative polyadenylation (APA) regulates gene expression. This study reveals APA dynamics during Arabidopsis pollen development, showing 3' untranslated region shortening in mature pollen and cell-type specific patterns.

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Area of Science:

Plant Biology
Molecular Biology
Genetics

Background:

Alternative polyadenylation (APA) is a key co-transcriptional mechanism controlling gene expression.
Pollen development is crucial for plant reproduction, but the role of APA in this process is not well understood.

Purpose of the Study:

To systematically characterize APA dynamics during Arabidopsis thaliana pollen development.
To investigate the contribution of APA to gene regulation in male gametophytes.

Main Methods:

Combined bulk RNA-sequencing (RNA-seq) across multiple tissues with single-nucleus transcriptomics.
Analyzed APA patterns at different pollen developmental stages and cell types.
Performed genetic analyses and in vivo reporter assays.

Main Results:

Mature pollen displays a distinct APA profile with widespread 3' untranslated region (3' UTR) shortening.
APA patterns show significant temporal and cell-type specificity during pollen development, especially in sperm nuclei.
Altered poly(A) site usage impacts transcript abundance and pollen development phenotypes.

Conclusions:

APA acts as a critical co-transcriptional regulatory layer in plant pollen development.
3' UTR configurations are sufficient to modulate gene expression at the transcript level.
Provides a framework for understanding 3' end-mediated gene regulation in male gametophytes.