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The difference between prenatal sequencing and current genetic testing is the amount of information and its usefulness. Current tests look for specific genetic disorders. Prenatal sequencing is a fishing expedition, looking at everything.
At present, the information is of limited use. No one knows what 90 percent of genes do, and it usually takes more than one gene to do anything. Furthermore, genes are not destiny: Just because one has the genes for certain diseases, such as coronary heart disease, does not mean one will get it.
“All genetic stuff is probabilistic,” Caplan said.
Some say that raises the question of whether Jews should be undergoing genome sequencing at all.
“Just because you can get the whole genome, why do that?” asked Rabbi Elliot Dorff, chairman of the Conservative movement’s Committee on Law and Standards. “How much do you want to find out and how much do you want to share with the couple, and later with the child? Just because you can doesn’t mean you should.”
The operative question, he notes, is whether it will cure or detect a serious disease.
“With all questions of this type, the law doesn’t ask how something is being done; it asks what we are accomplishing,” Broyde said. “If sequencing makes people healthier, it’s a good thing. If it’s going to make people ill, it’s sinning.”
Knobel says, “We need what I call an ethics of anticipation. We need a serious set of conversations about the implications of using the new technology, about how we can understand the values and ethics and come to grips with what it means in the long term.”