There are some genes that have both positive and negative effects in different contexts. For example, researchers now suspect that people who carry one copy of the mutated gene that causes cystic fibrosis (which requires two copies) have an increased defense against tuberculosis. Even gene variants implicated in neurodegenerative diseases like Alzheimer’s may have benefits, such as improved cognitive function and better working memory in young adults. What decisions would you make?
Schizophrenia, depression, and bipolar disorder can be brutal, often deadly. While trying to eliminate similar disorders, we should consider whether there might be some cost to society, even to civilization. A reason that scientists will not eliminate conditions such as psychiatric disorders or conditions such as autism is that some of the risk for these disorders almost certainly comes in trade for small competitive advantages, such as heightened sensitivity, concentration, or openness to experience.
A study showed a 77 percent rate of psychiatric disorders in eminent fiction writers. Writers are 10 times, and poets 40 times, more likely to be bipolar than the general population. Vincent van Gogh had either schizophrenia or bipolar disorder. So did the mathematician John Nash. People with bipolar disorder include Ernest Hemingway, Mariah Carey, Francis Ford Coppola, Graham Greene, Sylvia Plath, Edgar Allan Poe, and hundreds of other artists and creators.
To what extent does dealing with mood swings, fantasies, delusions, compulsions, mania, and deep depression help spur, in some people, creativity and artistry? Would you cure your own child from being schizophrenic if you knew that, if you didn’t, he would become a Vincent van Gogh? We have to face the potential conflict between what is desired by the individual versus what is good for human civilization.
A reduction in mood disorders would be seen as a benefit when seen from the point of view of an individual and as a cost when seen from the point of view of society. As we learn to treat mood disorders with drugs and eventually with genetic editing, will we have more happiness but fewer Hemingways? Do we wish to live in a world in which there are no Van Goghs? But what moral right do we have to require another family to forgo a desired genetic intervention simply for the sake of adding to the diversity of society?
Decisions about genetic editing are likely to be driven by consumer choice and the persuasive power of marketing. Initially people will think that if we can do so safely, why shouldn’t we prevent abnormalities, diseases, and disabilities? That sounds reasonable and morally justified but it might prove to be a slippery slope. They will naturally start thinking: Why not improve our capabilities and create enhancements - changes in which DNA is altered not to correct a harmful gene variant but to provide some type of genetic advantage, perhaps high intelligence or athletic abilities. (Of course, there is a limit to what enhancements will be possible or safe to attempt.)
While thinking about correcting disabilities, we should keep one factor in mind: to what extent they are inherently disabling and to what extent the disadvantage is due to our social constructs and prejudices. The disadvantages from being deaf, for a human or any other animal, are very real. In contrast, any disadvantages to being gay or Black are due to social attitudes that can and should be changed. That is why we can make a moral distinction between using genetic techniques to prevent deafness and using these techniques to influence such things as skin color and sexual orientation.
Then comes the question of super-enhancements. These are traits and capacities that exceed what any human has ever had. Suppose people can choose for their kids to have super-eyesight? What about adding the capacity to see infrared light or some new color? DARPA, the Pentagon’s research agency, already has a project going to study how to create genetically enhanced soldiers.
For example, genetic enhancement may be possible for improving memory. Scientists have managed to manipulate a memory-linked gene in fruit flies. They have produced smart mice by inserting extra copies of a memory-related gene into mouse embryos and the improvement was passed on to offspring. Human memory is more complicated. Should research in this area be allowed? But the natural instinct of scientists is to pioneer procedures and make discoveries. If a nation imposes too many. restrictions, its scientists will move elsewhere and pursue the research.
Since the wealthy would be able to afford the procedure more often, and since any beneficial genetic modifications made to an embryo would be transmitted to all of that person’s offspring, linkages between class and genetics would keep growing from one generation to the next, no matter how small the disparity in access might be. Consider the effect this could have on the socioeconomic fabric of society. The co-discoverer of CRISPR, Jennifer Doudna says,
We could create a gene gap that would get wider with each new generation...If you think we face inequalities now, imagine what it would be like if society became genetically tiered along economic lines and we transcribed our financial inequality into our genetic code.
This may also create a different kind of injustice. Using gene editing to “fix” things like deafness or obesity could create a less inclusive society, one that pressures everyone to be the same. Part of what makes our species unique, and our society so strong, is its diversity. A fear is that gene editing will increase existing prejudices against people who fall outside a narrow range of genetic norms.