Structure analysis of human gut microbiota associated with single-celled gut protists using Next-Generation Sequencing of 16S and 18S rRNA genesOriginal paper
Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease, four years before the first published case study.
Read MoreWhat was studied?
The study asked how single-celled gut protists relate to human gut bacterial community structure. Researchers profiled stool with amplicon sequencing of 16S and 18S rRNA genes. They compared carriers and non-carriers of Blastocystis, Giardia, Entamoeba, and other Archamoebae. Methods included alpha and beta diversity, LEfSe differential abundance, and random forest prediction of carrier status from bacteria.
Who was studied?
The cohort was 91 people in Algeria who were suspected of intestinal parasitosis based on symptoms like abdominal pain, diarrhea, or bloating. Samples were collected from 2013 to 2018 across hospitals in Algiers and Biskra. Participants included 48 males, 39 females, and four of unknown sex. Ages spanned 2 to 74 years. By testing, 60 were Blastocystis-positive and 31 negative. Co-colonization with other protists, including Entamoeba, Giardia, and other Archamoebae, was also assessed.
What were the most important findings?
Blastocystis carriage did not shift overall diversity, but Entamoeba did. Blastocystis-positive and negative individuals differed for neither alpha (p=0.62) nor beta diversity (ANOSIM p=0.141). Entamoeba-positive people had higher richness (p=0.00086) and distinct communities (ANOSIM p=0.001). When stratified, Entamoeba drove diversity even independent of Blastocystis. Random forest predicted Entamoeba carriage from bacteria with AUC 0.96, Giardia 0.89, Archamoebae 0.87, and Blastocystis 0.77.
What are the greatest implications of this study?
The findings suggest Entamoeba, not Blastocystis alone, may actively drive gut bacterial diversity. Blastocystis-positive people showed eubiosis-like features, but possibly only when co-colonized with Entamoeba. That hints testing for Entamoeba could help interpret whether Blastocystis carriage signals a healthy gut. The authors stress the data are descriptive associations from one Algerian cohort. The small sample and low Giardia sequencing sensitivity limit firm causal conclusions.