Identifying group‐specific primers for environmental Heterolobosa by high‐throughput sequencing

• Published in: Microbial biotechnology 2022-09, Vol.15 (9), p.2476-2487
• Main Authors: Delafont, Vincent, Mercier, Anne, Barrouilhet, Stéphanie, Mollichella, Marie‐Laure, Herbelin, Pascaline, Héchard, Yann
• Format: Article
• Language: English
• Subjects: Biomonitoring; Freshwater environments; Health risks; Life Sciences; rRNA 18S; Taxonomy
• ISSN: 1751-7915; 1751-7915
• DOI: 10.1111/1751-7915.14080

Summary Diversity of Heterolobosea (Excavata) in environments is poorly understood despite their ecological occurrence and health‐associated risk, partly because this group tends to be under‐covered by most universal eukaryotic primers used for sequencing. To overcome the limits of the traditional morpho‐taxonomy‐based biomonitoring, we constructed a primer database listing existing and newly designed specific primer pairs that have been evaluated for Heterolobosea 18S rRNA sequencing. In silico taxonomy performance against the current SILVA SSU database allowed the selection of primer pairs that were next evaluated on reference culture amoebal strains. Two primer pairs were retained for monitoring the diversity of Heterolobosea in freshwater environments, using high‐throughput sequencing. Results showed that one of the newly designed primer pairs allowed species‐level identification of most heterolobosean sequences. Such primer pair could enable informative, cultivation‐free assays for characterizing heterolobosean populations in various environments. In this work, we designed and tested new primer pair that helps to target Heterolobosea, a group of protist that is often neglected and undercovered in conventional high throughput sequencing approaches