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Study of multiple genetic variations caused by persistent hepatitis C virus replication in long-term cell culture

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Abstract

The most characteristic feature of the hepatitis C virus (HCV) genome in patients with chronic hepatitis C is its remarkable variability and diversity. To better understand this feature, we performed genetic analysis of HCV replicons recovered from two human hepatoma HuH-7-derived cell lines after 1, 3, 5, 7, and 9 years in culture: The cell lines 50-1 and sO harbored HCV 1B-1 and O strain-derived HCV replicons established in 2002 and 2003, respectively. The results revealed that genetic variations in both replicons accumulated in a time-dependent manner at a constant rate despite the maintenance of moderate diversity (less than 1.8% difference) between the clones and that the mutation rate in the 50-1 and sO replicons was 2.5 and 2.9 × 10−3 base substitutions/site/year, respectively. We found that the genetic distance of both replicons increased from 7.9% to 10.5% after 9 years in culture. In addition, we observed that the guanine + cytosine (GC) content of both replicon RNAs increased in a time-dependent manner, as observed in our previous studies. Finally, we demonstrated that the high sensitivity of both replicons to direct-acting antivirals was maintained even after 9 years in culture. Our results suggest that long-term cultured HCV replicon-harboring cells are a useful model for understanding the variability and diversity of the HCV genome and the drug sensitivity of HCV in patients with chronic hepatitis C.

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Acknowledgements

We thank Takashi Nakamura, Keiko Takeshita, Narumi Yamane, and Naoko Kimura for their technical assistance. We also thank Dr. Kyoko Mori, Dr. Yasuo Ariumi, Dr. Ken-ichi Abe, Dr. Kazuhito Naka, Dr. Akito Nozaki, and Dr. Kazuo Sugiyama for their helpful suggestions. This study was supported by a JSPS KAKENHI grant (no. 16H05196) and a grant for Practical Research on Hepatitis from the Japan Agency for Medical Research and Development (AMED) (no. JP19fk0210053h0301).

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Correspondence to Nobuyuki Kato.

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Fig. S1

Genetic variations occurring during the 9-year replication of HCV 50-1 and sO replicon RNAs. (A) Genetic variations in the first 2-kb region of the HCV 50-1 replicon. The horizontal line indicates the culture time (in years). The genetic distance (%) of the clones obtained from 50-1(1Y), 50-1(3Y), 50-1(5Y), 50-1(7Y), and 50-1(9Y) cells from the 50-1(0Y) cell-derived HCV replicon [16] is shown in the figure. (B) Genetic variations in the first 2-kb region of the HCV sO replicon. The genetic distance (%) of the clones obtained from sO(1Y), sO(3Y), sO(5Y), sO(7Y), and sO(9Y) cells from the sO(0Y) cell-derived HCV replicon [11] is shown in the figure (TIFF 1241 kb)

Fig. S2

Phylogenetic trees based on deduced amino acid sequences of the NS 6-kb regions of HCV 50-1 and sO replicon populations obtained over a 9-year time period. (A) Phylogenetic tree of the NS 6-kb region of the HCV 50-1 replicon based on the deduced 1987-amino-acid sequences of all cDNA clones obtained from 50-1(1Y), 50-1(3Y), 50-1(5Y), 50-1(7Y), and 50-1(9Y) cells. 50-1(0Y, Origin) indicates the original sequences of the NS 6-kb region of the HCV 50-1 replicon [10]. (B) Phylogenetic tree of the NS 6-kb region of the HCV sO replicon based on the deduced 1987-amino-acid sequences of all cDNA clones obtained from sO(1Y), sO(3Y), sO(5Y), sO(7Y), and sO(9Y) cells. sO(0Y, Origin) indicates the original sequences of the NS 6 kb region of the HCV sO replicon [11] (TIFF 1350 kb)

705_2019_4461_MOESM3_ESM.tif

Phylogenetic trees of HCV 50-1 and sO replicon populations obtained over a 9-year period. (A) Phylogenetic tree of the first 2-kb region of the HCV 50-1 replicon based on the nucleotide sequences of all cDNA clones obtained from 50-1(1Y), 50-1(3Y), 50-1(5Y), 50-1(7Y), and 50-1(9Y) cells. 50-1(0Y, Origin) indicates the original sequences of the first 2-kb region of the HCV 50-1 replicon [10]. (B) Phylogenetic tree of the first 2-kb region of the HCV sO replicon based on the nucleotide sequences of all cDNA clones obtained from sO(1Y), sO(3Y), sO(5Y), sO(7Y), and sO(9Y) cells. sO(0Y, Origin) indicates the original sequences of the first 2-kb region of the HCV sO replicon [11] (TIFF 1354 kb)

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Kato, N., Ueda, Y., Sejima, H. et al. Study of multiple genetic variations caused by persistent hepatitis C virus replication in long-term cell culture. Arch Virol 165, 331–343 (2020). https://doi.org/10.1007/s00705-019-04461-0

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