When I speak to colleagues in and outside Europe and visit research portals and social media, including Facebook groups, I get the impression that Blastocystis subtyping is something that is still very rarely done, despite the fact that most clinical microbiologists and biologists acknowledge that subtypes may differ in terms of clinical significance and in other respects. We get new data on Blastocystis subtypes in various cohorts from time to time from research groups around the world, but all reports are characterised by relatively small sample sizes and subtyping methodology has not yet been standardised. This type of research is moreover challenged by the fact that Blastocystis is common in healthy individuals (i.e. people not seeing their GPs for gastrointestinal problems), and this makes it extremely difficult to identify the subtype distribution in the "background" population.
Although we recommend barcoding (see one of my previous posts) as the subtyping method of choice, there is no "official report" identifying the Blastocystis subtyping gold standard. Therefore, I'm currently setting up a lab project that is going to help us compare the most common methods used for subtyping in order to identify the one most suitable. I emphasise that the best method used for subtyping is not the PCR that should be used for diagnostic purposes, mostly due to the fact that PCRs for subtyping amplify 300-600 bp, which are much longer amplicons than the one we go for in diagnostic PCRs (typically 80-100 bp). We therefore recommend our novel TaqMan-based real-time PCR for initial diagnosis, or culture, which is inexpensive and relatively easy and provides you with a good source of cells for DNA extraction.
I hope that we will be able to come up with some robust data soon that will allow us to recommend the most suitable approach and hope to publish our results in a clinical microbiology journal of high impact, and I hope that this will prompt Blastocystis subtyping in many labs. Once this report has been published, I intend to upload a protocol here at the site where lab procedures for diagnosis and subtyping will be described in detail. Stay tuned!
Although we recommend barcoding (see one of my previous posts) as the subtyping method of choice, there is no "official report" identifying the Blastocystis subtyping gold standard. Therefore, I'm currently setting up a lab project that is going to help us compare the most common methods used for subtyping in order to identify the one most suitable. I emphasise that the best method used for subtyping is not the PCR that should be used for diagnostic purposes, mostly due to the fact that PCRs for subtyping amplify 300-600 bp, which are much longer amplicons than the one we go for in diagnostic PCRs (typically 80-100 bp). We therefore recommend our novel TaqMan-based real-time PCR for initial diagnosis, or culture, which is inexpensive and relatively easy and provides you with a good source of cells for DNA extraction.
I hope that we will be able to come up with some robust data soon that will allow us to recommend the most suitable approach and hope to publish our results in a clinical microbiology journal of high impact, and I hope that this will prompt Blastocystis subtyping in many labs. Once this report has been published, I intend to upload a protocol here at the site where lab procedures for diagnosis and subtyping will be described in detail. Stay tuned!
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