What makes us uniquely human

Washington, Sept 2 (ANI): In a remarkable piece of detective work, scientists working at Trinity College Dublin have discovered three genes that are unique to humans.

In the study published online in Genome Research, boffins have made a crucial discovery of genes that have evolved in humans after branching off from other primates.

In the field of molecular evolution, the prevailing wisdom was that new genes could only evolve from duplicated or rearranged versions of preexisting genes. It seemed highly unlikely that evolutionary processes could produce a functional protein-coding gene from what was once inactive DNA.

However, recent evidence suggests that this phenomenon does in fact occur. Researchers have found genes that arose from non-coding DNA in flies, yeast, and primates. No such genes had been found to be unique to humans until now, and the discovery raises fascinating questions about how these genes might make us different from other primates.

Now, in the latest study, David Knowles and Aoife McLysaght of the Smurfit Institute of Genetics at Trinity College Dublin undertook the task of finding protein-coding genes in the human genome that are absent from the chimp genome. Once they had performed a rigorous search and systematically ruled out false results, their list of candidate genes was trimmed down to just three. Then came the next challenge.

"We needed to demonstrate that the DNA in human is really active as a gene," said McLysaght.

The authors gathered evidence from other studies that these three genes are actively transcribed and translated into proteins, but furthermore, they needed to show that the corresponding DNA sequences in other primates are inactive. They found that these DNA sequences in several species of apes and monkeys contained differences that would likely disable a protein-coding gene, suggesting that these genes were inactive in the ancestral primate.

The authors also note that because of the strict set of filters employed, only about 20 percent of human genes were amenable to analysis. Therefore they estimate there may be approximately 18 human-specific genes that have arisen from non-coding DNA during human evolution. (ANI)