“For the first time, scientists have put together a picture of what it might have looked like genetically. But not everyone is convinced. The portrait comes from new research published July 25, in which scientists sorted through 6 million genes to settle on 355 they think Luca may have carried.”
" Genes change in a predictable way over time, which means that comparing the DNA sequences of living organisms lets scientists make hypotheses about organisms we have no other way of studying. So the scientists, led by William Martin at Heinrich Heine University in Germany, looked at genes from bacteria and archaea: the two large umbrella groups of single-celled life. Genes that could be found in at least two groups of bacteria and two groups of archaea were considered likely to have belonged to Luca."
“The 355 genes the researchers picked out suggest Luca survived without oxygen, pulling energy from carbon dioxide and hydrogen instead, that it could survive very high temperatures, and that it required the presence of metals.”