Anhydrobiotic Adaptations in Tardigrade Species
Summary
Anhydrobiosis is a reversible ametabolic state enabling tardigrades to endure near-complete desiccation by orchestrating integrated structural and molecular strategies. Upon drying, individuals contract into a compact “tun” through active musculature-mediated reorganisation and cuticular folding, minimising volume and water loss. Concurrently, water-replacement is achieved by intrinsically disordered proteins that stabilise membranes and proteins in the absence of liquid water. Unique heat-soluble protein families and specialised DNA-protective factors further preserve cellular and genomic integrity by preventing aggregation and oxidative damage. Genomic surveys have uncovered lineage-specific genes and instances of horizontal gene acquisition that underpin diverse dehydration-tolerance mechanisms. Together, these adaptations highlight tardigrades’ extraordinary resilience and suggest avenues for applications in biomolecule preservation, agriculture and novel therapeutics.
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Anhydrobiotic Adaptations in Tardigrade Species publication trend
The graph below shows the total number of articles in anhydrobiotic adaptations in tardigrade species across all publications each year (not limited to Nature Index journals).
Technical terms
Anhydrobiosis: Reversible suspension of metabolism induced by extreme dehydration.
Tun formation: Compact, dehydrated morphology adopted by tardigrades to minimise water loss.
Intrinsically disordered proteins: Polypeptides lacking stable tertiary structure that stabilise biomolecules under stress.
Heat-soluble proteins (CAHS/SAHS): Tardigrade-specific proteins that remain soluble when heated and form α-helices upon drying.
Damage suppressor (Dsup) protein: Nucleosome-binding factor that protects chromosomal DNA from oxidative damage.
Horizontal gene transfer: Acquisition of genetic material from another species, independent of inheritance.
References
- Molecular Strategies of the Caenorhabditis elegans Dauer Larva to Survive Extreme Desiccation. PLOS ONE (2013).
- Two Novel Heat-Soluble Protein Families Abundantly Expressed in an Anhydrobiotic Tardigrade. PLOS ONE (2012).
- The tardigrade damage suppressor protein binds to nucleosomes and protects DNA from hydroxyl radicals. eLife (2019).
- Comparative genomics of the tardigrades Hypsibius dujardini and Ramazzottius varieornatus. PLOS Biology (2017).
- Comparative transcriptomics suggest unique molecular adaptations within tardigrade lineages. BMC Genomics (2019).
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