Lake Bacteria Shed Half Genes in Michigan to Survive Better

Scientists in Michigan observed lake bacteria shedding half their genetic code. This is like a car getting rid of extra parts to become lighter and faster.
By Newsroom | Science, Environment |

GENOMIC STREAMLINING SEEN IN MICROBES

A distinct form of bacterial life, seemingly shedding half its genetic makeup, has been observed to thrive by stripping down to its essential functions. This 'genomic streamlining,' a process where bacteria discard non-critical genetic material, appears to offer an adaptive edge, according to recent scientific observations.

ESSENTIALS ONLY

The phenomenon is particularly noticeable in bacteria existing within well-defined, often symbiotic, environments. Examples include microbes living in partnership with insects and those inhabiting the vastness of the open ocean. A prime example, Candidatus Pelagibacter ubique strain HTCC1062, a member of the marine SAR11 clade, showcases this radical genetic editing.

Further illustrating this principle, the bacterium Carsonella ruddii presents an even more extreme case. Previously, scientists believed a minimum genome size of 400,000 base pairs was necessary for bacterial survival. However, Carsonella ruddii defies this, possessing a mere 160-kilobase genome. This drastic reduction indicates a profound reliance on its host, as many genes typical of independent bacteria are conspicuously absent.

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The drive for such genome reduction suggests an evolutionary strategy focused on maximizing efficiency. By retaining only the barest essentials, these bacteria may achieve faster replication rates or require fewer resources, conferring an advantage in their specific ecological niches. This genetic pruning appears to be a one-way street, with no indication of these bacteria reverting to more complex genetic structures.

Frequently Asked Questions

Q: What did scientists discover about lake bacteria in Michigan?
Scientists found that some bacteria in Michigan lakes are shedding about half of their genetic material. This helps them survive by using fewer resources and reproducing faster.
Q: Why are these bacteria shedding their genes?
This process, called genomic streamlining, helps bacteria become more efficient. By getting rid of unneeded genes, they can live with less energy and replicate more quickly in their specific environments.
Q: Is this a new discovery for all bacteria?
While genomic streamlining is seen in various bacteria, like those living with insects or in the ocean, this observation highlights its presence and importance in lake ecosystems.
Q: What is an example of a bacterium with a very small genome?
A bacterium called Carsonella ruddii has an extremely small genome, only 160-kilobases, which is much smaller than the previously thought minimum needed for survival, showing a strong dependence on its host.
Q: Will these bacteria get their genes back?
The scientific observations suggest this genetic reduction is a one-way process. These bacteria are not expected to regain the genes they have shed.