Case 10: Savior Sibling
In the early 1990s, Molly Nash was born with Fanconi anemia, a rare disease that results in
the decreased production of blood cells.
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Only a toddler, her bone marrow started to fail. When a
bone marrow donor couldn't be found, it seemed hope was lost. That is, until Dr. John Wagner,
director of the Division of Hematology-Oncology and Blood and Marrow Transplantation at the
University of Minnesota, stepped in. Using a procedure that increases egg production, embryos
could be genetically diagnosed before implantation and then born as an ideal match through in vitro
fertilization (IVF). Lisa and Josh Nash, Molly's parents, decided to have a baby that was
selected to match Molly's bone marrow perfectly. Lisa conceived a son, Adam, and immediately
after his birth, doctors used the blood of the umbilical cord to give Molly a life-saving transfusion.
Most parents are willing to do anything to keep their child safe: "It was my baby and you
know what, I was going to take care of her no matter what she had," Lisa Nash once said.
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The
benefits of preimplantation genetic diagnosis (PGD) can be very high. Parents can screen for known
genetic diseases or conditions, preventing unhealthy embryos from being implanted.
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This can
decrease the risk of having a child who will inherit a disease from a parent. And, as in the Nash's
case, it can be used to screen for genetic matches. However, this procedure does not come without
risks. Using IVF-PGD, there is only a 54% delivery rate. Further, tests cannot check for every
type of disorder and disease; it does not guarantee that a healthy child will be born. Finally, there is
always the risk of false negatives.
The Nash's case is highly controversial, and there are others like it. Starting in the 90's,
cases like theirs have been subjected to much media attention. It even inspired the popular book-
turned- movie "My Sister's Keeper'' by Jodi Picoult. Some opponents argue that the procedure is a
slippery slope toward "designer babies," where parents screen for traits such as athletic ability, skin,
eye, hair color, height, or intelligence to create the so-called perfect child. There is also a fear of
having children not only to collect bone marrow, but to harvest organs
Other opponents argue that having a child intended to save a sibling places an undue burden
on the new child. The thought that one was brought into the world to provide bone marrow, an
organ, or blood for a sick sibling may be a difficult existential weight. The child must live with
the fact that they are alive to save a sibling.
At the end of the day, what really matters is that the child is loved and cared for. Dr. Paul
Billings, a board member of the Council for Responsible Genetics, said: "On the one hand this
could theoretically commodify children, but on the other hand there is no evidence that children
conceived this way are loved any less. As long as this family loves the child, then we should stay
out of their business."
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