Genetic engineering may undercut human diseases, but also could help restore extinct species, researcher says

18 hours ago by Alvin Powell In his talk, Adapting Species to a Changing World: The Potential of Genome Editing, Professor George Church spoke about his efforts to engineer a mammoth from its closest living relative, the African elephant, while also discussing the primary goal of such technology: improving human health. Credit: Ann Wang

Mammoth DNA in recovered cells frozen for thousands of years is likely too fragmented to clone an animal, according to Harvard geneticist George Church. So he's working instead to engineer one genetically from a close relative, the Asian elephant.

Genetic studies have shown that the Asian elephant is more closely related to the extinct mammoth than to its closest living relative, the African elephant. That provides scientists with the basic stock to build a mammoth, said Church, the Robert Winthrop Professor of Genetics at Harvard Medical School.

"The Asian elephant and the mammoth are really close, closer than the African elephant," Church said during a lecture yesterday. "We're assuming that the Asian elephant is basically right, a mutant [mammoth] that has a problem living at minus 50 C."

Church acknowledged there are important differences between the two animals and said current efforts are aimed at one key contrast: cold tolerance. Increasing that in Asian elephants would mean changing several traits, such as adding a double fur coat and a thick layer of fat to keep out the cold, and reducing ear size to cut heat loss. Church said researchers are testing possible changes in lab cultures and are still several years from trying them out in an elephant.

Church's mammoth work is part of a kaleidoscope of research efforts fueled by genetic engineering, he said. While health and medical goals are driving down the price of genome analysis and fostering the development of new technology, some of the most far-reaching applicationslike resurrecting the mammoth and other extinct creatureslie outside human health.

Another potential non-medical use involves using genetic engineering to manage existing species, such as building malaria resistance into mosquitoes to minimize the human suffering the disease causes, or "de-evolving" the herbicide resistance weeds develop over time to restore a herbicide's effectiveness.

Church spoke at the Harvard Museum of Natural History, one of the Harvard Museums of Science & Culture (HMSC). His presentation, "Adapting Species to a Changing World: The Potential of Genome Editing," was before a crowd of several hundred in a packed Geological Lecture Hall. He was introduced by HMSC Executive Director Jane Pickering.

Though much of Church's talk focused on "de-extinction" and the genetic engineering of species, he also discussed the primary goal of such technology: improving human health. With the cost of decoding the genome having dropped from $3 billion to $999, cheap, widespread genetic analysis may help people understand their risk for genetically influenced ailments. Rapid, portable analysis could be used in the environment to detect potential infectious agents, and in the doctor's office to guide more effective care.

Church acknowledged that many medical conditions have a complex genetic background and are influenced by several genessometimes even several hundred genesbut said there can be a relative handful that outstrip others in importance and so provide therapeutic targets. For example, height has been shown to be influenced by 700 genes, but just a couple, affecting growth hormone production and use, are known to have a sizeable effect on getting taller.

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Genetic engineering may undercut human diseases, but also could help restore extinct species, researcher says