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Home Science News Marine

Bacterial glitter

July 9, 2024
in Marine
Reading Time: 3 mins read
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Marinobacter alginolytica
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The iridescent colors known from peacock feathers or butterfly wings are created by tiny structures that reflect light in a special way. Some bacterial colonies form similar glittering structures. In collaboration with the Max Planck Institute of Colloids and Interfaces, Leibniz Institute DSMZ-German Collection of Microorganisms and Cell Cultures, Utrecht University, University of Cambridge, and the Netherlands Institute for Sea Research, the scientists sequenced the DNA of 87 structurally colored bacteria and 30 colorless strains and identified genes that are responsible for these fascinating colonies. These findings could lead to the development of environmentally friendly dyes and materials, a key interest of the collaborating biotechnology company Hoekmine BV.

Marinobacter alginolytica

Credit: Picture: Colin Ingham

The iridescent colors known from peacock feathers or butterfly wings are created by tiny structures that reflect light in a special way. Some bacterial colonies form similar glittering structures. In collaboration with the Max Planck Institute of Colloids and Interfaces, Leibniz Institute DSMZ-German Collection of Microorganisms and Cell Cultures, Utrecht University, University of Cambridge, and the Netherlands Institute for Sea Research, the scientists sequenced the DNA of 87 structurally colored bacteria and 30 colorless strains and identified genes that are responsible for these fascinating colonies. These findings could lead to the development of environmentally friendly dyes and materials, a key interest of the collaborating biotechnology company Hoekmine BV.

Predictions with artificial intelligence

The researchers trained an artificial intelligence model to predict which bacteria produce iridescent colors based on their DNA. “With this model, we analyzed over 250,000 bacterial genomes and 14,000 environmental samples from international open science repositories”, says Prof. Bas E. Dutilh, Professor of Viral Ecology at the University of Jena and researcher in the Cluster of Excellence ‘Balance of the Microverse’. “We discovered that the genes responsible for structural color are mainly found in oceans, freshwater, and special habitats such as intertidal zones and deep-sea areas. In contrast, microbes in host-associated habitats such as the human microbiome displayed very limited structural color.”

Ecological significance and future applications

The study results indicate that the colorful bacterial colony structures are not only used to reflect light. Surprisingly, these genes are also found in bacteria that live in deep oceans without sunlight. This could imply that the colors could reflect deeper processes of cell organization with important functions, such as protecting the bacteria from viruses, or efficiently colonizing floating food particles. These findings could inspire new, sustainable technologies based on these natural structures.

Excellent collaborative research

The international research project exemplifies how two profile lines of the Friedrich Schiller University Jena, LIFE and LIGHT, can find each other. It also addresses the goals of the Cluster of Excellence “Balance of the Microverse”, where Prof. Dutilh has held one of four ‘Microverse Professorships’ as an Alexander von Humboldt Professor since 2021. The cluster investigates the complex relationships within microbial communities, and the role of colony structure in microbial interaction is one of the key research questions.



Journal

Proceedings of the National Academy of Sciences

DOI

10.1073/pnas.2309757121

Method of Research

News article

Subject of Research

Cells

Article Title

Structural color in the bacterial domain: The ecogenomics of a 2-dimensional optical phenotype

Article Publication Date

8-Jul-2024

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