Related Experiment Video
Updated: Mar 2, 2026
Multiplex Detection of Bacteria in Complex Clinical and Environmental Samples using Oligonucleotide-coupled Fluorescent Microspheres
Published on: October 23, 2011
One-step simultaneous detection of Ureaplasma parvum and genotypes SV1, SV3 and SV6 from clinical samples using
M S Payne1, L L Furfaro1, R Tucker2
1School of Women's and Infants' Health, University of Western Australia, Subiaco, WA, Australia.
Abstract:
Ureaplasma spp. are associated with preterm birth. In recent times, it has become apparent that Ureaplasma parvum, but not Ureaplasma urealyticum, is of most relevance. We recently demonstrated this in Australian pregnant women and using high-resolution melt (HRM) PCR, further showed that U. parvum genotype SV6 was of particular significance. However, our assay was unable to identify multiple genotypes in the same sample, required a separate species-level qPCR for low titre samples and was not ideal for diagnostic laboratories due to the nature of HRM PCR result interpretation. Consequently, our current study developed a novel, one-step PlexPCR assay capable of detecting U. parvum and genotypes SV1, SV3 and SV6 in a single reaction directly from clinical samples. We then validated this using vaginal swab DNA from our Australian cohort of pregnant women. The PlexPCR was highly sensitive, detecting all targets to between 0.4 × 10-5 ng DNA (SV3) and 0.4 × 10-6 ng DNA (U. parvum, SV1 and SV6). Compared to our HRM PCR, the PlexPCR defined genotype distribution in all seven cases previously reported as 'mixed', and detected another eight cases where multiple genotypes (two) were present in samples previously reported as single genotypes using HRM PCR.
Significance And Impact Of The Study:
Ureaplasma spp. have been associated with prematurity for decades, however, only a minority of studies have examined this beyond the genus level. In those that have, Ureaplasma parvum has been strongly associated with preterm birth. We recently demonstrated this in Australian women and further showed that U. parvum genotype SV6 was of particular significance. Our PlexPCR assay allows rapid detection and concurrent genotyping of U. parvum in clinical samples and may be of particular interest to obstetricians, particularly those caring for women at a high risk of preterm birth, and any other disease phenotypes where U. parvum is of interest.
Insights
A new PlexPCR test accurately detects Ureaplasma parvum and its specific genotypes, crucial for understanding preterm birth risks. This advancement aids in diagnosing infections and managing high-risk pregnancies.
Area of Science:
- Microbiology
- Genetics
- Obstetrics
Background:
- Ureaplasma species are linked to preterm birth, with Ureaplasma parvum identified as a significant factor.
- Previous methods for Ureaplasma parvum genotyping, like HRM PCR, had limitations in detecting multiple genotypes and were complex for routine diagnostics.
Purpose of the Study:
- To develop and validate a novel, one-step PlexPCR assay for the simultaneous detection and genotyping of Ureaplasma parvum (including SV1, SV3, and SV6) directly from clinical samples.
- To improve upon the limitations of existing diagnostic methods for Ureaplasma parvum detection and genotyping.
Main Methods:
- Development of a one-step multiplex PCR (PlexPCR) assay.
- Validation of the assay using vaginal swab DNA from a cohort of Australian pregnant women.
- Comparison of PlexPCR results with previous HRM PCR findings.
Main Results:
- The PlexPCR assay demonstrated high sensitivity, detecting targets at very low DNA concentrations (0.4 × 10⁻⁵ to 0.4 × 10⁻⁶ ng DNA).
- PlexPCR accurately identified mixed Ureaplasma parvum genotypes in samples previously classified as single genotypes or mixed by HRM PCR, detecting an additional eight cases of multiple genotypes.
- The assay successfully identified Ureaplasma parvum and genotypes SV1, SV3, and SV6 in a single reaction.
Conclusions:
- The developed PlexPCR assay provides a rapid and accurate method for detecting and concurrently genotyping Ureaplasma parvum in clinical samples.
- This assay is particularly relevant for obstetricians managing pregnancies at high risk of preterm birth and for other clinical scenarios involving Ureaplasma parvum.
- The ability to detect multiple genotypes simultaneously offers a significant advantage over previous methods for Ureaplasma parvum diagnostics.
