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Characterization of hepatitis B virus with complex structural variations.

Kei Fujiwara1, Kentaro Matsuura2, Kayoko Matsunami2

  • 1Department of Gastroenterology and Metabolism, Nagoya City University Graduate School of Medical Sciences, 1 Kawasumi, Mizuho, Nagoya, Aichi, 467-8601, Japan. keifuji@med.nagoya-cu.ac.jp.

BMC Microbiology
|December 5, 2018
PubMed
Summary

Hepatitis B virus (HBV) genetic research identified novel complex structural variations (SVs) in 70 HBV strains. These HBV SVs, frequently located between nt 1500-2000, often involved insertions and deletions.

Keywords:
Complex structural variationGenetic rearrangementHepatitis B virusHepatocyte nuclear factor 1 binding site

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Area of Science:

  • Virology
  • Genetics
  • Hepatology

Background:

  • Hepatitis B virus (HBV) infection poses a significant global health challenge.
  • Recent genetic studies reveal complex structural variations (SVs) in HBV, involving insertions, deletions, and duplications.
  • Understanding these HBV genetic rearrangements is crucial for comprehending disease pathogenesis.

Purpose of the Study:

  • To conduct an extensive search for complex structural variations (SVs) in Hepatitis B virus (HBV) genetic sequences.
  • To analyze the characteristics of identified HBV complex SVs.
  • To contribute to the understanding of HBV genetic diversity and its implications.

Main Methods:

  • Bioinformatical tools were employed to analyze HBV genetic sequences.
  • A comprehensive search identified 55 new HBV strains with complex SVs.
  • A total of 70 HBV strains, including previously reported ones, were analyzed for complex SVs.

Main Results:

  • Complex SVs were frequently located between nucleotides 1500 and 2000 in the HBV genome.
  • Insertions were a common feature, present in 92.9% of analyzed HBV strains with complex SVs.
  • The most frequent complex SV pattern involved a combination of insertion and deletion, classified into six distinct groups.

Conclusions:

  • This study identified novel HBV strains harboring complex SVs through extensive sequence analysis.
  • The characteristics of HBV with complex SVs were elucidated by analyzing 70 strains.
  • Further research is necessary to determine the role of these complex SVs in the pathogenesis of HBV-related liver diseases.