2017 · Journal of applied oral science : revista FOB · open access
Human DNA extraction from whole saliva that was fresh or stored for 3, 6 or 12 months using five different protocols
Garbieri et al.
The finding, in our words
Across five extraction protocols, storage time generally reduced DNA quantity but protocol 1 (Oragene) maintained yield; DNA purity was largely unaffected by storage for commercial protocols but declined for non‑commercial methods; only protocol 1 consistently gave unfragmented DNA and protocols 1–4 yielded amplifiable DNA while protocol 5 rarely did. This supports reliable saliva self‑collection and long‑term storage for genotyping in decentralised settings.
A paraphrase to the Library’s standard, never the abstract. The source is one link away and is always the authority.
An evaluation of five saliva collection kits found that only Norgen and Stratec achieved DNA yields comparable to Oragene of 30 µg or more, whilst Oasis was the easiest for sample collection. All commercial kits outperformed an in-house protocol, offering viable, cost-effective options for decentralised sampling.
The study found that combining the Oragene saliva collector with the miRNeasy kit gave the most sensitive detection of seven saliva miRNAs, and that different collector-kit combinations can be selected to suit different study needs.
The study found that the Oragene OG-600 receptacle provided the highest concentration of salivary DNA, including short fragments suitable for analysis, and successfully detected HPV DNA from patient saliva. This matters for decentralised sampling as it supports the use of a standardised, self-collection device for non-invasive cancer biomarker detection.
Self-collected saliva samples provided adequate DNA for genotyping in preterm birth research, though questionnaire data on birth details had limited concordance with prospective records, indicating that while DNA sampling is feasible via post, phenotyping requires more reliable data collection methods for genetic studies.
Telomere length measurements vary significantly depending on the sample type used, with Oragene saliva showing a moderate correlation to venous buffy coat, whereas Oasis saliva and dried blood spots did not yield comparable or adequate results for this assay.