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Updated: Oct 8, 2025

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Published on: October 16, 2018
Constraint of Base Pairing on HDV Genome Evolution.
Saki Nagata1, Ryoji Kiyohara1, Hiroyuki Toh1
1Department of Biomedical Chemistry, School of Science and Technology, Kwansei Gakuin University, Gakuen, Sanda 669-1337, Japan.
Base pairing in the hepatitis delta virus (HDV) genome significantly slows down evolution in non-coding regions. Unpaired nucleotides also face constraints, though weaker than paired ones.
Area of Science:
- Virology
- Molecular Biology
- Evolutionary Biology
Background:
- Hepatitis delta virus (HDV) is a single-stranded circular RNA virus.
- HDV exhibits high internal nucleotide self-complementarity, with up to 70% of its genome capable of base-pairing.
- Previous evolutionary studies of HDV have largely overlooked the impact of its secondary structure.
Purpose of the Study:
- To develop and apply a novel method for analyzing the influence of base pairing on nucleotide substitutions during HDV evolution.
- To investigate how secondary structure impacts the evolutionary rate of the HDV genome.
Main Methods:
- Development of a computational method to model base-pairing constraints on nucleotide substitutions.
- Application of this method to analyze the evolutionary rates within the HDV genome, specifically comparing paired and unpaired regions.
Main Results:
- Base pairing within the HDV genome acts as a significant constraint, reducing the evolutionary rate in non-coding regions.
- Non-coding nucleotides lacking base pairing are also subject to evolutionary constraints.
- The constraint on unpaired non-coding nucleotides is less intense than that imposed by base pairing but stronger than constraints on synonymous sites.
Conclusions:
- Secondary structure, specifically base pairing, plays a crucial role in shaping the evolutionary trajectory of the hepatitis delta virus.
- The findings highlight a nuanced evolutionary landscape for HDV, with varying degrees of constraint on different nucleotide types within the non-coding regions.
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