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Toldrà, Anna; O'Sullivan, Ciara K.; Diogène, Jorge; Campàs, Mònica
The Science of the total environment, 12/2020, Volume: 749Journal Article
Harmful algal blooms (HABs) represent a growing threat to aquatic ecosystems and humans. Effective HAB management and mitigation efforts strongly rely on the availability of timely and in-situ tools for the detection of microalgae. In this sense, nucleic acid-based (molecular) methods are being considered for the unequivocal identification of microalgae as an attractive alternative to the currently used time-consuming and laboratory-based light microscopy techniques. This review provides an overview of the progress made on new molecular biotechnological tools for microalgal detection, particularly focusing on those that combine a nucleic acid (DNA or RNA) amplification step with detection. Different types of amplification processes (thermal and isothermal) and detection formats (e.g. microarrays, biosensors, lateral flows) are presented, and a comprehensive overview of their advantages and limitations is provided Although isothermal techniques are an attractive alternative to thermal amplification to reach in-situ analysis, further development is still required. Finally, current challenges, critical steps and future directions of the whole analysis process (from sample procurement to in-situ implementation) are described. Display omitted •A description of PCR and isothermal techniques to amplify microalgal DNA/RNA is provided.•Isothermal techniques are being used but major development is still required.•The critical steps to achieve true implementation of the molecular tools are considered.•Application of these new sensing tools is possible for an unlimited number of microalgal species.
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