AI Article Synopsis
- Diatoms, a type of microalgae, have shifted from photosynthesis to becoming obligate heterotrophs, but the reasons behind this change are not fully understood.
- Research in Singapore identified new non-photosynthetic diatom strains with unique behaviors, including the ability to navigate using secreted substances and faster movement when following trails left by others.
- Findings suggest that these diatoms exhibit metabolic adaptations and a sophisticated motility system, including the ability to exert pushing forces and respond to environmental obstacles during movement.
Article Abstract
Diatoms are ancestrally photosynthetic microalgae. However, some underwent a major evolutionary transition, losing photosynthesis to become obligate heterotrophs. The molecular and physiological basis for this transition is unclear. Here, we isolate and characterize new strains of non-photosynthetic diatoms from the coastal waters of Singapore. These diatoms occupy diverse ecological niches and display glucose-mediated catabolite repression, a classical feature of bacterial and fungal heterotrophs. Live-cell imaging reveals deposition of secreted extracellular polymeric substance (EPS). Diatoms moving on pre-existing EPS trails (runners) move faster than those laying new trails (blazers). This leads to cell-to-cell coupling where runners can push blazers to make them move faster. Calibrated micropipettes measure substantial single-cell pushing forces, which are consistent with high-order myosin motor cooperativity. Collisions that impede forward motion induce reversal, revealing navigation-related force sensing. Together, these data identify aspects of metabolism and motility that are likely to promote and underpin diatom heterotrophy.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10547550 | PMC |
| http://dx.doi.org/10.1098/rsob.230148 | DOI Listing |
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