Research Jan. 2, 2020 The End of Infertility Is in Sight – UCSF News Services
By daniellenierenberg
Fertility expert Marcelle Cedars discusses the future of reproductive medicine.
By Ariel Bleicher UCSF Magazine
Advances in medicine and public health have dramatically extended the human lifespan. Our hearts, lungs, and other vital organs now last 79 years on average. For women, however, the ovaries which stop functioning at an average 51 years remain a stubborn exception. That may soon change, says fertility expert Marcelle Cedars, MD, during a conversation on the future of reproductive medicine.
There are two aspects. One is qualitative. As a woman ages, the quality of her eggs meaning their capacity to make a healthy baby declines. We understand very little about what causes this decline. If we understood that process better, we could dramatically impact fertility success rates.
The other aspect is quantitative. Women are born with a finite number of eggs, and they lose those eggs throughout their lifetime. In fact, that rapid decline in egg numbers starts even before birth. Theres a peak in utero of five to six million eggs. At birth, a woman has only about 1.5 million eggs; at the time of puberty, about 500,000. Through genetics research, were learning that the rate of this decline and the variability from woman to woman is largely driven by ones genes.
Exactly. But what if we could use your genetics and other biological data to understand your unique fertility risks and develop therapies specifically for you or for groups of women like you? This approach is called precision medicine. It has made a huge impact in the world of cancer in terms of improving survival rates. But in the field of reproductive health, precision medicine is still in its infancy.
Potentially. If we can pinpoint the mechanisms of ovarian aging, we could potentially develop a therapy that enables you to still have healthy eggs into your 50s, possibly your 60s. But just because we can do something doesnt always mean we should do it. We know that as women get older, pregnancies are more complicated. You have higher risk for things like high blood pressure, diabetes, and preterm labor. There are many downstream implications, both for the mothers health and the childs.
I dont think the goal should be to enable women to get pregnant into their 60s. Rather, we want women to have the best reproductive lifespan possible to be able to have children when they want to and to not have children when they don't want to and to have a society that supports women across that spectrum.
Were starting to believe that some of the same cellular mechanisms that underlie general aging might also control ovarian aging. This revelation makes the ovary even more interesting to study because its early demise could be a unique window into the bodys aging process. If we can identify cases of accelerated ovarian aging and understand the underlying causes, we might be able to improve not only reproductive function in individual women but also overall health and longevity for all women.
Samesex couples having genetically related children is probably on the horizon. Scientists are learning how to take skin cells or blood cells and turn them into stem cells, which can then be turned into eggs or sperm. Thats not science fiction; its already happening. We just need to figure out how to do it well and safely in humans.
Well probably also see germline engineering. Thats the process of editing genes in reproductive cells or embryos. It has the potential to cure disease before birth. This technology is here. But will society be ready to accept it? A lot of questions need to be answered before its put to use. In addition to technical hurdles, there are innumerable social issues. For instance, if we can eliminate a certain disease, will there be less focus on treatments for people who still have the disease? And what about access to care and social equity? Who would be able to afford these procedures? How will they be applied?
Restrictions are currently preventing the U.S. government from funding research that involves the manipulation of human embryos. As a result, funding for reproductive science is low, which has driven a lot of experts out of academia. If we want to see a revolution in reproductive health, like whats happening with precision cancer medicine, we need to invest in the development of scientific knowledge that will move this field forward.
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Research Jan. 2, 2020 The End of Infertility Is in Sight - UCSF News Services
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