UC DAVIS (US) — Genes, like other living things, sometimes have to gain skills to succeed. New research shows that the genes that come out on top do so by a process of “innovation, amplification, and divergence.”
Researchers say the observation, reported October 19 in the journal Science, closes an important gap in the theory of natural selection.
Scientists have long wondered how living things evolve new functions from a limited set of genes. One popular explanation is that genes duplicate by accident; the duplicate undergoes mutations and picks up a new function; and, if that new function is useful, the gene spreads.
“It’s an old idea and it’s clear that this happens,” says John Roth, professor of microbiology at University of California, Davis and co-author of the paper.
Experiments in Roth’s laboratory and elsewhere led to a model for the origin of a novel gene by the process of “innovation, amplification, and divergence” where the original gene first gains a second, weak function alongside its main activity—just as an auto mechanic, for example, might develop a side interest in computers.
If conditions change such that the side activity becomes important, then selection of this side activity favors increasing the expression of the old gene. In the case of the mechanic, a slump in the auto industry or boom in the IT sector might lead to honing computer skills and looking for a position in IT.
The most common way to increase gene expression is by duplicating the gene, perhaps multiple times. Natural selection then works on all copies of the gene. Under selection, the copies accumulate mutations and recombine. Some copies develop an enhanced side function. Other copies retain their original function.
Ultimately, the cell winds up with two distinct genes, one providing each activity—and a new genetic function is born.
Joakim Nasvall, Lei Sun, and Dan Andersson of Uppsala University in Sweden tested this model using the bacterium Salmonella. The bacteria carried a gene involved in making the amino acid histidine that had a secondary, weak ability to contribute to the synthesis of another amino acid, tryptophan. In their study, they removed the main tryptophan-synthesis gene from the bacteria and watched what happened.
After growing the bacteria for 3,000 generations on a culture medium without tryptophan, they forced the bacteria to evolve a new mechanism for producing the amino acid. What emerged was a tryptophan-synthesizing activity provided by a duplicated copy of the original gene.
“The important improvement offered by our model is that the whole process occurs under constant selection—there’s no time off from selection during which the extra copy could be lost,” says Roth.
The work was supported by the Swedish Research Council and the National Institutes of Health.
Source: UC Davis