J Bacteriol Virol.  2019 Sep;49(3):115-123. 10.4167/jbv.2019.49.3.115.

Rapid Whole-genome Sequencing of Zika Viruses using Direct RNA Sequencing

Affiliations
  • 1Institute of Endemic Diseases, Seoul National University Medical Research Center, Seoul, 03080, Korea. hesss@snu.ac.kr
  • 2Department of Microbiology and Immunology, Seoul National University College of Medicine, Seoul, 03080, Korea.
  • 3National Primate Research Center, Korea Research Institute of Bioscience and Biotechnology, Cheongju, Korea.

Abstract

Zika virus (ZIKV) is one of the pathogens which is transmitted world widely, but there are no effective drugs and vaccines. Whole genome sequencing (WGS) of viruses could be applied to viral pathogen characterization, diagnosis, molecular surveillance, and even finding novel pathogens. We established an improved method using direct RNA sequencing with Nanopore technology to obtain WGS of ZIKV, after adding poly (A) tails to viral RNA. This established method does not require specific primers, complimentary DNA (cDNA) synthesis, and polymerase chain reaction (PCR)-based enrichment, resulting in the reduction of biases as well as of the ability to find novel RNA viruses. Nanopore technology also allows to read long sequences. It makes WGS easier and faster with long-read assembly. In this study, we obtained WGS of two strains of ZIKV following the established protocol. The sequenced reads resulted in 99% and 100% genome coverage with 63.5X and 21,136X, for the ZIKV PRVABC59 and MR 766 strains, respectively. The sequence identities of the ZIKV PRVABC59 and MR 766 strains for each reference genomes were 98.76% and 99.72%, respectively. We also found that the maximum length of reads was 10,311 bp which is almost the whole genome size of ZIKV. These long-reads could make overall structure of whole genome easily, and WGS faster and easier. The protocol in this study could provide rapid and efficient WGS that could be applied to study the biology of RNA viruses including identification, characterization, and global surveillance.

Keyword

Whole genome sequencing (WGS); Zika virus (ZIKV); Direct RNA sequencing

MeSH Terms

Bias (Epidemiology)
Biology
Diagnosis
DNA
Genome
Genome Size
Methods
Nanopores
Polymerase Chain Reaction
RNA Viruses
RNA*
RNA, Viral
Sequence Analysis, RNA*
Tail
Vaccines
Zika Virus*
DNA
RNA
RNA, Viral
Vaccines

Figure

  • Figure 1. Sequence alignment display on the reference ZIKV genome with Geneious Prime for three runs. (A) Sequence alignment for ZIKV PRVABC59 strain from the first run. (B) Sequence alignment for ZIKV PRVABC59 strain from the second run.(C) Sequence alignment for ZIKV MR 766 strain from the third run.

  • Figure 2. Analysis with EPI2ME. EPI2ME is a cloud-based data analysis platform of nanopore data in real-time. It shows the portion of reads for each microorganism. (A) The portion of reads for ZIKV PRVABC59 strain from the first run. (B) The portion of reads for ZIKV PRVABC59 strain from the second run. (C) The portion of reads for ZIKV MR 766 strain from the third run.

  • Figure 3. Long-reads with Nanopore technology. Several long sequences of ZIKV MR 766 were aligned to the reference genome. The maximum long sequence was 10,311bp.

  • Figure 4. Relative quantification of ZIKV. Original Sup represents the original viral supernatant, Sup after HC represents the viral supernatant after high-speed centrifugation, Pellet after HC represents the pellet after high-speed centrifugation of the viral supernatant, and Sup after UC represents the viral supernatant after ultra-centrifugation. Bars indicate SEM from three experiments.

  • Figure 5. The work flow for WGS of single-strand RNA virus using direct RNA sequencing with Nanopore technology. High-speed centrifugation was important to improve the efficiency of WGS and direct RNA sequencing with Nanopore technology could make WGS faster and easier with long-reads and without specific primers and PCR-based enrichment


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