Identical-looking soil amoebas turn out to be metabolically distinct
Freudenthal J, Bonkowski M, Engelmann NM, Schlegel M, Dumack K
Soil Health
The soil under your garden beds teems with microscopic predators like these amoebas that graze on bacteria and recycle nutrients your plants depend on, and this study shows that even look-alike strains can behave very differently underground.
Researchers studied a group of tiny single-celled organisms called Rhogostoma that live in soil and eat bacteria, plus some of their relatives that eat other microbes. Even though different strains looked nearly identical under a microscope, their genetic activity revealed big differences in how they stick to surfaces, form clumps, and process fats and amino acids. The finding suggests that soil life is far more functionally diverse than it appears, even among organisms that look the same.
Key Findings
15 transcriptomes were assembled from bacteria-eating Rhogostoma strains and their predatory relatives that eat other microbes
Morphologically identical Rhogostoma strains split into two distinct genetic clusters with different genes for cell adhesion and biofilm formation
Rhogostoma showed considerable variation and reduced completeness in amino acid and lipid metabolism pathways compared to their eukaryvorous relatives, suggesting an ancestral narrowing of diet led to later metabolic diversification
chevron_right Technical Summary
Scientists compared the genetic blueprints of tiny soil-dwelling amoebas called Rhogostoma and found that even nearly identical-looking strains have surprisingly different metabolic toolkits and ways of sticking to surfaces, showing how much hidden diversity exists among microscopic predators that shape soil ecosystems.
Abstract Preview
Original paper
Physiological diversity and adaptation of Rhizaria revealed by phylogenomics and comparative transcriptomics.
Protists are vastly diverse, forming over 20 supergroups of the eukaryotic diversity and fulfilling plentiful functions. Rhizaria is a widespread and highly abundant clade comprising important para...
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