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Chromatin Position Affects Gene Expression

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Related Experiment Video

Updated: Mar 15, 2026

Deciphering Molecular Mechanism of Histone Assembly by DNA Curtain Technique

Deciphering Molecular Mechanism of Histone Assembly by DNA Curtain Technique

Published on: March 9, 2022

Nucleosome positioning shapes cryptic antisense transcription.

Jian Yi Kok^1,2, Zachary H Harvey¹, Elin Axelsson¹

¹Austrian Academy of Sciences, Gregor Mendel Institute, Vienna, Austria.

|March 13, 2026

Summary

This summary is machine-generated.

Nucleosome positioning by the Hrp3 chromatin remodeler suppresses harmful cryptic transcription. This mechanism maintains genome stability but can also enable the evolution of new regulatory antisense transcripts.

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Area of Science:

Molecular Biology
Epigenetics
Genomics

Background:

Transcriptional fidelity is crucial for gene regulation and genome stability.
Cryptic antisense transcription, occurring opposite to coding sequences, is widespread but poorly understood.
Mechanisms regulating cryptic transcription initiation sites remain incompletely elucidated.

Purpose of the Study:

To investigate the role of nucleosome arrays in gene bodies in suppressing cryptic transcription.
To identify the molecular players involved in positioning nucleosomes at cryptic transcription start sites.
To explore the functional implications of cryptic transcription, including its potential for regulatory innovation.

Main Methods:

Utilized the fission yeast Schizosomyces pombe as a model organism.
Investigated the function of the CHD-family chromatin remodeler Hrp3 and its interaction with the transcription elongation machinery (Prf1/RTF1).
Assessed nucleosome occupancy at gene bodies and analyzed cryptic transcription initiation in wild-type and mutant strains.

Main Results:

Demonstrated that nucleosome arrays within gene bodies suppress cryptic transcription initiation.
Showed that Hrp3, in coordination with Prf1/RTF1, positions nucleosomes at cryptic initiation sites.
Found that loss of Hrp3 leads to reduced nucleosome occupancy at AT-rich sequences, promoting cryptic transcription.
Identified a subset of cryptic antisense transcripts encoding essential meiotic genes.

Conclusions:

Established an elongation-coupled chromatin pathway that maintains transcriptional fidelity.
Revealed that nucleosome remodeling by Hrp3 shapes antisense transcription, impacting cellular homeostasis.
Highlighted that cryptic transcription, while often detrimental, can contribute to adaptive potential and regulatory innovation.