Cornell University establishes Center for Reproductive Genomics

May 10 2007

Cornell University has established the Center for Reproductive Genomics, which will combine basic research in reproductive sciences on Cornell's Ithaca campus with one of the country's leading fertility clinics at Weill Cornell Medical College (WCMC) in New York City.

Infertility affects 10 to 15 percent of couples of childbearing age.

“This is an area of research that is important to people on a personal basis,” said Cornell Vice Provost for Life Sciences Stephen Kresovich. “The great capabilities both at Ithaca and Weill Cornell to do this type of research make this center a natural fit for the university.”

The collaborative center will focus on the genetics of infertility, with specific emphasis on meiosis, the specialized cell division that results in recombination of genetic material and the production of sperm in the male throughout life and eggs in the female fetus, which then develop over 20-plus years.

The center now has about 15 faculty members from the two campuses engaged in collaborations. All consulted on or wrote a $5 million grant proposal recently submitted to the National Institutes of Health to help fund the center.

“Ultimately, about 100 faculty members from both campuses will be part of the
center, which is unique for its distinct focus on genetic mechanisms,” said Paula Cohen, the center's director and an assistant professor of genetics in the Department of Biomedical Sciences at Cornell's College of Veterinary Medicine. “We can now look at how reproductive performance is genetically determined.”
The center will target both human and animal health. Observations of the role of genetics in infertile human patients from WCMC can now be studied further through animal models at the Ithaca campus. For animals, fertility studies will help with everything from wildlife conservation to breeding cattle and horses.

“This is an example of a collaborative translational research process that brings together the best of a world-renowned clinical research program in male and female infertility with strong basic research from Ithaca that is likely to grow beyond the sum of its individual parts through its synergistic opportunities,” said Peter Schlegel, chairman of urology at WCMC and urologist-in-chief at NewYork-Presbyterian Hospital/Weill Cornell Medical Center. Schlegel has led efforts at WCMC to establish the center.

Schlegel and Darius Paduch, assistant professor of urology and reproductive medicine at WCMC's Brady Urological Health Center, have previously shown that up to one-third of men with severe male infertility have defective recombination of chromosomes during meiosis, which can often disrupt sperm production. John Schimenti, professor of genetics in the veterinary college and director of Cornell's Center for Vertebrate Genomics, has taken this discovery one step further by producing mice with specific gene defects that lead to abnormal meiosis, allowing him to examine the genetic basis of similar processes that Schlegel and Paduch observed in humans.

Also, part of Cohen's work aims to answer why defects in male meiosis lead to the death of sperm cells, while similar defects in female meiosis preserve eggs. These defective eggs survive, but errors in female meiosis are responsible for high rates of birth defects in humans, including Down syndrome, for example. To study these genetic processes, Cohen and her colleagues have grafted human fetal ovarian tissue into mice. Within 20 weeks, the mice produced tiny human ovaries containing human eggs.

“Female meiosis takes 20 odd years in normal woman,” Cohen said, because eggs in humans don't mature until puberty. “What we can do now is study the process in a few months in a mouse.”

As the genes responsible for disrupting female meiosis are identified in mice, Cohen will work with physicians within the Center for Reproductive Medicine and Infertility at WCMC, headed by Zev Rosenwaks, to find genetic markers in human female patients to determine whether defective meiosis might be causing infertility.

The Center for Reproductive Genomics already has a functional and fully equipped laboratory at WCMC, while Cornell's Veterinary College handles the center's administrative functions.