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Selective Whole-Genome Amplification as a Tool to Enrich Specimens with Low Treponema pallidum Genomic DNA Copies for Whole-Genome Sequencing

Journal Article · · mSphere
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4];  [1];  [1];  [1];  [1];  [1];  [5];  [1];  [1];  [1]
  1. Centers for Disease Control and Prevention (CDC), Atlanta, GA (United States)
  2. Centers for Disease Control and Prevention (CDC), Atlanta, GA (United States); Emory Univ., Atlanta, GA (United States)
  3. San Francisco Department of Public Health, San Francisco, CA (United States)
  4. St. Louis County Sexual Health Clinic, St. Louis, MO (United States); Washington Univ., St. Louis, MO (United States)
  5. Emory Univ., Atlanta, GA (United States)
Downstream next-generation sequencing (NGS) of the syphilis spirochete Treponema pallidum subspecies pallidum (T. pallidum) is hindered by low bacterial loads and the overwhelming presence of background metagenomic DNA in clinical specimens. In this study, we investigated selective whole-genome amplification (SWGA) utilizing multiple displacement amplification (MDA) in conjunction with custom oligonucleotides with an increased specificity for the T. pallidum genome and the capture and removal of 5'-C-phosphate-G-3' (CpG) methylated host DNA using the NEBNext Microbiome DNA enrichment kit followed by MDA with the REPLI-g single cell kit as enrichment methods to improve the yields of T. pallidum DNA in isolates and lesion specimens from syphilis patients. Sequencing was performed using the Illumina MiSeq v2 500 cycle or NovaSeq 6000 SP platform. These two enrichment methods led to 93 to 98% genome coverage at 5 reads/site in 5 clinical specimens from the United States and rabbit-propagated isolates, containing >14 T. pallidum genomic copies/μL of sample for SWGA and >129 genomic copies/μL for CpG methylation capture with MDA. Variant analysis using sequencing data derived from SWGA-enriched specimens showed that all 5 clinical strains had the A2058G mutation associated with azithromycin resistance. SWGA is a robust method that allows direct whole-genome sequencing (WGS) of specimens containing very low numbers of T. pallidum, which has been challenging until now.
Research Organization:
Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, TN (United States)
Sponsoring Organization:
Centers for Disease Control and Prevention (CDC); USDOE Office of Science (SC)
Grant/Contract Number:
SC0014664
OSTI ID:
1982985
Journal Information:
mSphere, Journal Name: mSphere Journal Issue: 3 Vol. 7; ISSN 2379-5042
Publisher:
American Society for MicrobiologyCopyright Statement
Country of Publication:
United States
Language:
English

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