Imprimis

Releasing the Genetic Genie: How Risky?

Liebe Cavalieri
Professor of Biochemistry, Graduate School of Medical Sciences, Cornell University


Liebe CavalieriLiebe F. Cavalieri is Professor of Biochemistry at the Graduate School of Medical Sciences, Cornell University. He has also had a long association with the Sloan-Kettering Institute for Cancer Research. As a researcher, he is credited with pioneering discoveries in the molecular biology of DNA. As a science writer, his publications include the book The Double-Edged Helix: Science in the Real World. The editors extend special thanks to Professors Samuel Townsend, Donald Heckenlively, and Ted Platt of the Hillsdale natural sciences faculty for their invaluable assistance in assembling the CCA seminar on which this issue is based.


Editor's Preview: What actually goes on at a seminar of the Center for Constructive Alternatives?

Leading thinkers from around the world gather with Hillsdale College students and faculty for a week of exploring ideas and values in collision. Issues in public policy and ethics are clarified. Genuine liberal arts education—rare on today's vocational-minded, relativist campuses—occurs.

Both conservative and liberal viewpoints are presented in the CCA, without labels so students can weigh them on their merits. Imprimis this month invites its readers to join in that experience of responsible choice between clashing ideas.

Professors Alexander Capron and Liebe Cavalieri were among ten speakers at a CCA seminar on the genetic revolution in March 1983. One's theme was promise; the other's, concern. Which, in your opinion, makes the more liberal argument and which the more conservative? How do their premises differ? Which side do you take?

 

We Do Not Have the Wisdom

The very core of life has been put at man’s disposal. What had been a scholarly, reflective science, molecular biology, was transformed, ten years ago, into a force that not only can examine the living organism but now can manipulate it in ways never before possible, at the will of the scientist.

Life systems can be restructured by creating a new architecture for DNA. Living cells of all types can be engineered so that they can perform tasks foreign to their species. Bacteria can be transformed so that they carry out human functions. Cancer viruses can be propagated inside bacteria. Mice can be grown to twice their normal size. Intervention in the germ line (reproductive cells) of mice has been achieved, opening the way for similar procedures in humans.

We can anticipate that recombinant DNA technology will present problems that are as pervasive and disquieting as those that have sprung from nuclear fission. Both are major scientific accomplishments that confer a power on humans for which they are psychologically and morally unprepared. The physicists have already learned this, to their dismay; the biologists, not yet.

Nobel laureate David Baltimore has recently proclaimed: “We can outdo evolution”—a signal that molecular biologists are about to translate genetic engineering into an instrument of power, much the way the physicists did when they exploited their discoveries at the beginning of the nuclear age.

Economic Demands vs. Human Needs

In the habitual manner of our times, scientists are pursuing their interests and then rationalizing the pursuit by looking for uses for their discoveries, whether society needs them or not, rather than starting with the most pressing problems and looking for solutions. This may have been acceptable in the past but I’m not sure society can afford this luxury right now, when it is facing an alarming series of threats that have recently become apparent.

These threats include water and air pollution by industrial products and wastes, accelerating soil erosion and desertification, exhaustion of renewable resources such as water and forests faster than they can be replenished, the “greenhouse” effect, acid rain, ozone depletion, species extinction, depletion of mineral resources, excessive population growth, malnutrition—not to mention the nuclear arms race.

These are not separate problems; all are interrelated, and in the long run they are exacerbated by the fact that solutions are sought on an individual basis, with no regard for the consequences that any given “solution” might have for other members of the set. Too often, economic demands are pitted against human needs.

Recombinant DNA technology has been so widely promoted by scientists and the news media that industrial giants from all over the world have been induced to invest heavily in it. Genetic manipulation of micro-organisms by the new techniques has proceeded rapidly and is now widespread. More than 150 genetic engineering firms mainly oriented just now toward the design of industrially useful micro-organisms, have formed in the last few years. The technology has been translated into economic power, and with it molecular biologists have become entrepreneurs, leaving the Ivory Tower far behind.

The profound ecological, social, and ethical implications of genetic engineering have been obscured by its marketability. All forms of life are vulnerable to this technology—any DNA can be connected to any other DNA; human DNA can be put into viruses and bacteria and vice versa; cancer virus DNA has already been put into bacteria, and so on. The gene pool of the Earth, the life-determinant of the future, is the experimental subject for genetic engineering. This precious, irreplaceable legacy of natural evolution is in the truest sense a one-time occurrence, and it would be naive to assume that we can manipulate it without harming ourselves. We do not have the requisite infinite wisdom.

Delicate Mechanism

In the face of the infinite complexity of natural systems, the idea that we could improve on the design of nature is not only hubris, it is frightening. In Lewis Thomas’s words, we are ignorant “most of all about the enormous, imponderable system of life in which we are embedded as working parts. We do not really understand nature at all.” We know that the Earth behaves like an indivisible, delicately tuned mechanism, in which the inanimate environment is strongly conditioned by living things, and vice versa; but we have only begun to decipher the influence of each part on the whole.

For example, we recognize that certain microorganisms convert organic wastes to usable nutrients, and that this recycling process is critical in maintaining the composition of the atmosphere and other conditions favorable to human life and to the web of species that sustain us. But we cannot predict the effects on these vital microorganisms of accelerated evolution, engineered by man, coupled with the accelerated environmental changes now produced by human activities.

However, as the result of current efforts to design industrially useful organisms, microorganisms with properties taken from higher forms of life will inevitably escape into the ecosphere; other engineered forms will eventually be released intentionally into the environment for purposes such as the solubilization of trace metals in mining operations or the digestion of oil spills. We are laying the groundwork for unforeseen evolutionary changes that may create an environment inhospitable to present species.

Frequently, one is confronted with specious arguments about how well evolutionary forces have managed thus far and how they will continue to provide viable ecosystems. Certainly, we can find some assurance in nature’s resiliency; life has survived environmental upheavals for millions of years. But as conditions have changed, so has the balance of life, with incompatible forms disappearing and new ones arising. If there were a drastic change in the environment, some forms of life would undoubtedly adapt, but humans, with their many, exacting biological requirements, could not evolve fast enough to become compatible with the new environment.

Genetic engineers have many visions. They plan to introduce foreign genes into crop plants in the hope of solving the problem of world hunger. But food experts and agronomists recognize that enough is already produced to feed everyone in the world. Distribution is the problem; it is not scientific but rather economic and political.

It is obvious that it would be naive to attempt to solve the food problem with recombinant DNA technology. Even if that technology should someday succeed in producing plants that can fix atmospheric nitrogen, the most that could be hoped for would be a small contribution of a temporary respite—a technological fix that has no bearing on the fundamental population problem and might have adverse side effects that would exacerbate the situation by producing ecological instability.

Bacterias that will consume oil from oil spills on the oceans have already been produced. In addition to ecological questions, the social implications of this procedure are far-reaching. It has been shown that crude oil spilled from faulty tankers has an adverse effect on marine life. The application of vast numbers of bacteria to consume the spill would doubtlessly lead to mutant forms with an altered metabolism, so that some might find a niche in the oceans or even on land, causing ecological disturbances.

‘When Do We Start?’

Genetic engineers have not overlooked the possibility of changing man himself. It will not be long before single-gene replacement therapy—the correction of a defective gene—will be possible. Although in this case the change will die with the patient, more radical experiments are underway in which eggs or sperm are altered to produce individuals with hereditary alterations. Considerable success along these lines has already been achieved in mice.

The rationale for these experiments is that they provide information about mammalian genetics and fetal development. But when the technology for intervention in human evolution has been perfected, will it remain unused? Preliminary experiments with human embryos have been underway in England, for example, for several years. What is more seductive than the power to design human beings?

Although the repair of genetic defects appears laudable, the indistinct boundary between repair and improvement raises serious problems. Who is to decide what qualities define a perfect human? In a changing world, the genetic engineering of perfection would imply a divine intelligence that could peer far into the future. There are some scientists who think they have such power. Professor James Bonner of Cal Tech has recently suggested:

The logical outcome of activities in modifying the genetic make-up of man is to reach the stage where couples will want their children to have the best possible genes. Sexual procreation will be virtually ended. One suggestion has been to remove genetic material from each individual immediately after birth and then promptly sterilize that individual. During the individual’s lifetime, record would be kept of accomplishments and characteristics. After the individual’s death, a committee decides if the accomplishments are worthy of procreation into other individuals. If so, genetic material would be removed from the depository and stimulated to clone a new individual. If the committee decides the genetic material is unworthy of procreation it is destroyed…The question is indeed not a moral one but a temporal one—when do we start?

Such men have fallen into the trap that often stands between scientists and the realization of a mature social conscience: reductionism, the operational form of modern scientific research. It requires that the system under investigation be first separated into its most minute components. The forest as a whole may thereby pass unnoticed.

This is a common pattern in our society. The focus is on specific and immediate problems, considered individually and in isolation from life as a whole. It is inevitable under these circumstances that the chosen solution to one problem will exacerbate another. Long-range social and economic well-being can never be attained by systematically ignoring the interrelatedness of our problems and the side effects and more distant consequences of our decisions; this fragmented approach is condemning us to crisis after crisis.

The Global 2000 Report to the President, which appeared in 1980, is a stark testimony to this. The report projects that if we continue on the same path, “the world in the year 2000 will be more crowded, more polluted, less stable ecologically, and more vulnerable to disruption than the world we live in now. Despite greater material output, the world’s people will be poorer in many ways than they are today.” The report calls for “new initiatives, if worsening poverty, human suffering, environmental degradation and international tension and conflicts are to be prevented. There are no quick fixes. New and imaginative ideas—and a willingness to act on them—are essential.”

Insofar as the scientific community has been distinguished by the purity of its motivation and its lack of bias and self-interest, to that same extent it has been free of corrupting power. But today power is thrust upon the scientist by the comprehensive knowledge he has gained, as well as by the vast technological influence of science in our society. To be true to itself, science must reject power in favor of responsibility. The scientist must have a conscience. Hand wringing after the fact offers no solution, as we have learned from the nuclear experience.

The discoveries that energy can be released from the atomic nucleus and that DNA, the material of the cell nucleus, is the genetic stuff of life are without parallel in human experience. These twin scientific feats, one at the core of matter, the other at the core of life, demand a new consciousness if human life on this planet is to continue.

We have mismanaged the applications of the first discovery. Now, as the second is about to be exploited, we must not permit the biosphere, surpassing as it does our understanding, to become an experimental subject. There is only one Earth, one earthly biosphere, and we are part of it. There is no margin for error.