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Bacterium alters its genome to adapt to new conditions


Compartments formed by folded cell membrane might serve as gene archives:

The largest freshwater bacterium, Achromatium oxaliferum, is highly flexible in its requirements, as researchers led by the IGB have now discovered: It lives in places that differ extremely in environmental conditions such as hot springs and ice water. The bacterial strains from the different ecosystems do not differ in their gene content, but rather chose what to express. The adaptation is probably achieved by a process which is unique to these bacteria: only relevant genes are enriched in the genomes and transcribed, while others are archived in cell compartments.

Achromatium is special in many respects: It is 30,000 times larger than its “normal” counterparts that live in water and owing to its calcite deposits it is visible to the naked eye. It has several hundred chromosomes, which are most likely not identical. This makes Achromatium the only known bacterium with several different genomes.

The researchers have analyzed sequence data bases of sediments and show that Achromatium is universal. It is found in a broad range of environments: in shallow waters as well as in the ocean at a depth of 4000 metres. It can be found in hot springs and ice-cold water; in acidic and alkaline environments as well as in hypersaline waters.

Typically, such a wide range of environmental conditions would result in the establishment of new species, well-adapted to their specific environment. However, Achromatium defies this expectation. Though, equipped with equal functionality, the bacteria in the various ecosystems differ in their gene expression patterns by transcribing only relevant genes.

Forschungsverbund Berlin, “Giant aquatic bacterium is a master of adaptation” at ScienceDaily

The paper is open access.

Darwinians: "Typically, such a wide range of environmental conditions would result in the establishment of new species, well-adapted to their specific environment. However, Achromatium defies this expectation." in regards to the above, let me quote from Matti Leisola book HERETIC: “Evolution is slow and gradual except when it is fast. It is dynamic and creates huge changes over time, except when it keeps everything the same for millions of years. It explains both extreme complexity and elegant simplicity. It tells us how birds learned to fly and yet also lost that ability. Evolution made cheetahs fast and turtles slow. Some creatures it made big and others small; some gloriously beautiful and others boringly grey. It forced fish to walk and walking animals to return to the sea. It diverges except when it converges; it produces exquisitely fine-tuned designs except when it produces junk. Evolution is random and without direction except when it moves toward a target. Life under evolution is a cruel battlefield except when it displays altruism. Evolution explains virtues and vice, love and hate, religion and atheism. And it does all this with a growing number of ancillary hypotheses. Modern evolutionary theory is the Rube Goldberg of theoretical constructs. And what is the result of all this speculative ingenuity? Like the defunct theory of phlogiston, it explains everything while explaining nothing well” (p. 199). martin_r
It was not seen in the 30 year E. coli experiment. 1,000,000 yeas was the equivalent time to humans, which was expected to prove evolution exists beyond adaptation. 10s of thousands of generations were watched to prove evolution true, since there is no evidence to support the claim. 30 years should have produce something beyond adaptation if the Darwinists are right, but showed only adaptation. https://www.discovermagazine.com/planet-earth/how-a-30-year-experiment-has-fundamentally-changed-our-view-of-how BobRyan
"Typically, such a wide range of environmental conditions would result in the establishment of new species," Typically? Something that has never been seen is not typical. When environment changes too much in one location, a species moves elsewhere if it can, or dies out if it can't. Natural selection is real. Speciation isn't real. polistra
Once again, there is evidence of adaptation. It is something that can be witnessed and replicated. Evolution has never been witnessed by anyone. Without witnessing something and replication, it cannot be a valid theory no matter how much some would like it to be so. BobRyan

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