Influenza viruses contain many more of these noninfectious biologically active particles than researchers suspected. He is interested in what role they may play in the course of the disease.
In a career that has spanned more than 60 years of scientific research, Marcus has been associated with a number of breakthroughs:
• In 1955, a paper he wrote as a graduate student at the University of Colorado with biophysicist Theodore T. Puck, after a discussion with Leo Szilard, the co-inventor of the atomic bomb, de
scribed a technique for cloning mammalian cells – the first time this had been done. (The cells they cloned, HeLa cells, were from Henrietta Lack, the subject of a current bestseller, The Immortal Life of Henrietta Lacks.) He was the first person to clone HeLa cells.
• An “intrinsic interference test” he developed as a junior faculty member at Albert Einstein College of Medicine made it possible to quantitatively detect rubella virus, the cause of an epidemic in the 1960s.
• In 1957, interferon was discovered, and it occupied much of Marcus’s research attention for many years. His Virus and Interferon Resarch Laboratory at Torrey Life Sciences became the leading proponent of the theory that double-stranded ribonucleic acid, dsRNA, is the inducer of interferon, and that just one molecule of dsRNA is enough to induce interferon production in a cell, thus activating a cell’s response to a virus.
The chills or fever experienced during a viral infection such as the flu are caused not by the virus, he once explained, but by interferon going to work. Interferon was once touted as a “miracle drug” for cancer. While genetically engineered interferon is used as a therapy for some cancers and some forms of hepatitis, its workings have proved to be more complex than first thought.
For more than 30 years Marcus has taught virology at UConn, and for 18 years he was editor-in-chief of the Journal of Interferon and Cytokine Research. He also directed the Biotechnology Bioservices Center for many years before resigning recently. And in a recent issue of its magazine, the American Society for Microbiology announced that Marcus is among seven 60-year members of the ASM, which has about 38,000 members.