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Comparative analysis of CpG islands in equine infectious anemia virus strains

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Abstract

Increasing evidence suggests that DNA methylation has key roles in the replication of retroviruses, including lentiviruses, and pathogenesis of diseases. However, the precise characteristics of CpG islands are not known for many retroviruses. In this study, we compared the distribution of CpG islands among strains of equine infectious anemia virus (EIAV), a lentivirus in the family Retroviridae and a model for HIV research. We identified CpG islands in 32 full-length EIAV genomic sequences obtained from the GenBank database using MethPrimer. Only one CpG island, from 100 to 120 bp, was identified in the genomes of EIAV strains DV10, DLV3-A, and DLV5-10 from China, V26 and V70 from Japan, and IRE H3, IRE F2, IRE F3, and IRE F4 from Ireland. Importantly, the CpG island was located within the Rev gene, which is required for the expression of viral cis-acting elements and the production of new virions. These results suggest that the distribution, length, and genetic properties of CpG islands differ among EIAV strains. Future research should focus on the biological significance of this CpG island within rev to improve our understanding of the precise roles of CpG islands in epigenetic regulation in the species.

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Acknowledgements

This study was supported by a grant from the Nanchong Vocational and Technical College fund for basic scientific research (Grant Nos. ZRA1904 and NZYBZ2002).

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Authors and Affiliations

  1. Nanchong Key Laboratory of Disease Prevention, Control and Detection in Livestock and Poultry, Nanchong Vocational and Technical College, Nanchong, 637131, China

    Qiang Liu, Yue-Yang Yu & Huai-Yu Wang

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  1. Qiang Liu
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  2. Yue-Yang Yu
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Contributions

YYY and WHY conducted the phylogenetic and sequence analyses. LQ conducted CpG analyses and wrote the manuscript. All authors have read and approved the fnal manuscript.

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Correspondence to Qiang Liu.

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Liu, Q., Yu, YY. & Wang, HY. Comparative analysis of CpG islands in equine infectious anemia virus strains. Virus Genes 56, 339–346 (2020). https://doi.org/10.1007/s11262-020-01749-1

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  • DOI: https://doi.org/10.1007/s11262-020-01749-1

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