2023-01-08Zeitschriftenartikel
Insertions and deletions in the hypervariable region of the hepatitis E virus genome in individuals with acute and chronic infection
Biedermann, Paula
Klink, Patrycja
Nocke, Maximilian K.
Papp, Christian-Patrick
Harms, Dominik
Kebelmann, Marianne
Thürmer, Andrea
Choi, Mira
Altmann, Britta
Todt, Daniel
Hofmann, Jörg
Bock, Claus-Thomas
Background and Aims:
Hepatitis E virus is a major cause of acute hepatitis worldwide and can progress to chronicity in immunocompromised individuals. Various virus–host recombination events have been reported in the hypervariable region of the hepatitis E virus genome, but the patterns of assembly and selection remain unclear.
Methods:
To gain further insight into viral evolution, we assessed the presence of low abundance variants in 16 samples from individuals with acute or chronic infection using a targeted next-generation sequencing approach.
Results:
In seven samples, different variants with insertions and/or deletions were identified. Among them, eight insertions originating either from human genes or from the hepatitis E virus genome. Five different deletions could be identified. The amino acid composition of sequences with insertions showed a higher frequency of lysine and a lower abundance of proline, and additionally acetylation and ubiquitination sites were more frequent than in hepatitis E virus wild-type sequences.
Conclusions:
These findings suggest that the nucleotide composition of insertions and sites for post-translational modification may contribute to recombination events. Although the impact of low-level hepatitis E virus variants is uncertain, our results highlight the importance of a highly sensitive next-generation sequencing approach to capture the full diversity of hypervariable region.
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