Evidence of DNA "scrunching" may one day lead to a new class of drugs against viruses, according to a research team from the Perelman School of Medicine at the University of Pennsylvania, the Georgia Institute of Technology, and Columbia University. The team is led by Stephen C. Harvey, PhD, an adjunct professor in the department of Biochemistry and Biophysics at Penn. The scientists report in The Journal of Physical Chemistry B that DNA may go through a repetitive cycle of contraction and elongation, or as they put it, "scrunching," to generate the forces required to drive the DNA into a virus during replication. A better understanding of viral reproduction could be the basis of new ways to fight infectious pathogens.