Recent scientific advances have indicated that it may be technically feasible to sustain human embryos in vitro beyond 14 days. Research beyond this stage is currently restricted by a guideline known as the 14-day rule. Since the advances in embryo culturing there have been calls to extend the current limit. Much of the current debate concerning an extension has regarded the 14-day rule as a political compromise and has, therefore, focused on policy concerns rather than assessing the philosophical foundations (...) of the limit. While there are relevant political considerations, I maintain that the success of extension arguments will ultimately depend on the strength of the justifications supporting the current 14-day limit. I argue that the strongest and most prevalent justifications for the 14-day rule—an appeal to individuation and neural development—do not provide adequate support for the limit of 14 days. I instead suggest that an alternative justification based on sentience would constitute a more defensible basis for embryo protection and that a consideration of such grounds appears to support an amendment to the current limit, rather than the retention of it. While these conclusions do not establish conclusively that the current limit should be extended; they do suggest that an extension may be warranted and permissible. As such, this paper offers grounds on which a reassessment of the 14-day rule may be justified. (shrink)

New developments in reproductive technology have made headlines since the birth of the world's first in vitro fertilization baby in 1978. But is embryo experimentation ethically acceptable? What is the moral status of the early human embryo? And how should a democratic society deal with so controversial an issue, where conflicting views are based on differing religious and philosophical positions? These controversial questions are the subject of this book, which, as a current compendium of ideas and arguments (...) on the subject, makes an original contribution of major importance to this debate. (shrink)

Moral dilemmas can arise from uncertainty, including uncertainty of the real values involved. One interesting example of this is that of experimentation on human embryos and foetuses, If these have a moral stauts similar to that of human persons then there will be server constraitns on what may be done to them. If embryous have a moral status similar to that of other small clusters of cells, then constraints will be motivated largely by consideration for the persons into whom (...) the embryos may develop. If the truth lies somewhere between these two extremes, the embryo having neither the full moral weight of persons, nor a completely negligible moral weight, then different kinds of constraints will be appropriate. On the face of it, in order to know what kinds of experiements, if any, we are morally justified in performing on embryos we have to know what the moral weight of the embryo is. But then an impasse threatens, for it seems implausible that we can settle with certainty the exact moral status of the human embryo. It is the purpose of this paper to show that moral uncertainty need not make rational moral justification impossible. I develop a framework which distinguishes between what is morally right/wrong, and what is morally justified/unjustified, and applies standard decision theoretic tools to the case of moral uncertainties. (This was the first published account of what has subsequently become known as Expected Moral Value Theory. An earlier version of the paper, "A decision theoretic argument against human embryo experimentation", was published in M. Fricke (ed.), Essays in honor of Bob Durrant. (University of Otago Press, 1986) 111-27.). (shrink)

In Embryo: A Defense of Human Life (Doubleday, 2008), Robert P. George and Christopher Tollefsen argue that human embryo-destructive experimentation is morally wrong and should not be supported with state funds. I argue that their arguments fail.

The objective of this paper is to explore the Buddhist position particularly within the Mahāyāna sect about the use of human embryos which may be either surplus embryos thawedinthe laboratoryorembryosculturedfor researchpurposes.Buddhismdoesnot give prominence to any supreme creation whose plan might be distorted by human intervention with nature. Buddhism postulates the cyclic course of human existence as eternal. There is no starting point to the series of lives lived and obviously there is no end. In the Buddhist thought, there is a (...) belief that every individual had existence prior to the present birth. Following this, the paper made a study of the details of the conception and gestation as found in the Buddhist literature and sources. Buddhism aims to do away with pain. Intention is an intrinsic aspect in Buddhism referred to as sankalpa, which is beyond mere goals and objectives. An action is deemed as good karma because of its intentions. To Buddhism, a selfless action gains significance. (shrink)

The use of modern medical technologies and interventions involves ethical and legal dilemmas which are yet to be solved. For the religious Jews the answer lies in Halakhah. The objective of this paper is to unscramble the difficult conundrum possessed by the halakhalic standing concerning the use of human embryonic cell for research. It also aims to take contemporary ethical issues arising from the use of technologies and medical advances made in human reproduction and study them from an abstract philosophical (...) perspective. Instead of providing any Jewish practical ruling the paper have tried to incite, stimulate and encourage philosophical thoughts about the issue through the intensive understanding of traditional Jewish thoughts. In this paper, an objective as well as a deep-rooted study has been adopted about the use of human embryos for research and the Jewish adoption of assisted reproductive technologies through the prism of the knowledge of Halakhah, Torah and Talmud. The paper finds that the embryo research sits at the crossroads of many halakhalic issues. Judaism adopts the belief that God has created man in his own image. The Jews not being dogmatic decipher “the image” of the creator as the ability to discern and reason. It follows that Judaism does not subscribe to the notion that tampering with nature is prohibited. To the Jews the mitzvah for procreation is so great that they are open to reason and adopt newer medical advancement in procreation. The Jewish laws are not only for engagement in intellectual exercise or academic pursuit but subscribe to a higher order of moral conduct. The Jewish approach is not situational but also casuistic in resolving conflicting medical issues. (shrink)

Karl-Heinz Narjes, Scientific Commissioner for the European Economic Community, revealed how profoundly views of embryo research differ when he stated, "We cannot have a situation in which the same research might lead to a Nobel Prize in some member states... and to prison in others." Through 19 essays contained in this volume, the editors seek "to scrutinize the scientific, ethical, public policy, and legal issues which must be addressed wherever the new technology exists".

Whenever embryo experimentation is discussed the question of whether it is preferable to use spare or specifically produced (‘research’) embryos for destructive embryo experimentation always enters the debate at some stage. This question is analysed, and it is suggested that the distinction is morally uninteresting, but rhetorically useful for both sides in the debate. It is further suggested that part of the force of this distinction is caused by the fact that it is parasitic on a (...) real moral distinction based on the degree to which the gametes used in the experiment are obtained by explicit or implicit coercion. (shrink)

ABSTRACT This article deals with a cluster of moral problems raised by the new techniques of human fertilisation. It is concerned primarily with the putative rights of embryos brought into being as a by‐product of the practice of in vitro fertilisation. In this connection it investigates the basis for the ascription of rights to entities and asserts the view that consciousness is a pre‐requisite for the possession of rights. It draws attention to the speciesism implicit in attitudes of some of (...) those who have contributed to the debate. It also examines other issues briefly, raising, for example, the question whether children by AID (or by in vitro fertilisation by donor) must be denied access to information about their genetic fathers; and looking at objections to the new techniques based on the so‐called unnaturalness of the procedures involved. (shrink)

Book reviewed in this article: Embryo Experhentation. Edited by Peter Singer et al.

In bioethics as in the sciences, enormous discussions often concern the very small. Central to public debate over emerging reproductive and regenerative biotechnologies is the question of the moral status of the human embryo. Because news media have played a prominent role in framing the vocabulary of the debate, this study surveyed the use of language reporting on human embryo research in news articles spanning a two-year period. Terminology that devalued moral status - for example, the descriptors things, (...) property, tissue, or experimental material - was found to outnumber fivefold those that affirmed any degree of moral status above that of inanimate cellular matter ; for example, living, human life, or human being. A quarter of the articles failed to note that the embryos under discussion were human. These findings confirm that even among scientific and philosophical experts a diversity of opinion exists on society's moral obligations to nascent human life. The skewed linguistic distribution also indicates a distinct bias. Concerned readers should take notice when any category of humanity becomes subject to prejudicial and disparaging language and the value of vulnerable human life is trivialized alongside sensational assertions of anticipated medical cures. The responsibility for holding the media to a higher standard of truth and fairness falls to us all. (shrink)

Reinvestigating the work of the anatomist Wilhelm His (1831-1904) shows how engaging with models in three dimensions can revise our accounts of scientific change. His is known to historians of biology for articulating a mechanical approach to embryology and for inventing a section cutter, or microtome. Focusing on the wax models that he also made in the late 1860s shows how the other two innovations were linked; reconstructing embryos from the sections, His claimed, provided compelling evidence for mechanical views. The (...) next generation of embryologists appropriated His's work selectively. In the 1880s anatomists took up "plastic reconstruction" to visualize the complex forms of higher vertebrate, especially human, embryos. An increasingly dominant experimental embryology, by contrast, drew on His's mechanical approach but had little use for the waxes and effaced them from the history of his work. Recovering these models offers a fresh perspective on the transformation of a central science of animal life and enriches our understanding of the relations between representation in two dimensions and three. (shrink)

Religion has a considerable influence over the public’s attitudes towards science and technologies. The objective of the paper is to understand the ethical and religious problems concerning the use of embryo for research in assisting conception for infertile couples from the perspective of Catholic Christians. This paper seeks to explain our preliminary reflections on how religious communities particularly the Catholic Christian communities respond to and assess the ethics of reproductive technologies and embryo research. Christianity as a whole lacks (...) a unified and definitive statement on when an embryo becomes a person, although fundamentalist Christians tend to be opposed to embryo experimentation. Roman Catholics tend to believe that the embryo should be treated as human life from the moment of conception or fertilisation. As opposed to this preconception I have tried to point out that a foetus is a clump of cells and lacks individuality as a conscientious human being and thus can be used for research for therapeutic reason. The paper concluded that the Church accepts techniques on embryo that respect their life. So they would allow procedures that are akin with healing and improvement of life without involving undue risks. The Church feels children should arise out of act of love between man and his wife in co-operation with God. In this regard, it may be pointed out though the creation of a child through a conjugal act in a wed lock is the preferred method since it is the most natural, least expensive one. But that does not mean, it should be the only acceptable means to conception. To state a child born using ARTs would be less perfect compared to a child born through conjugal act of husband and wife is absurd one to be mentioned. (shrink)

Robert George and Christopher Tollefsen argue that human beings have fundamental dignity and basic rights (“human rights”) in virtue of the kind of entity they are—creatures bearing a rational nature. The indicia of a rational nature are the basic natural capacities—which obtain from the point a rational creature comes into existence—for thinking, deliberating, and choosing, whether or not these capacities are immediately exercisable. All human beings, including those who are asleep, or under general anesthesia, or who are in deep comas (...) or persistent minimally conscious states, are bearers of a rational nature. The same is true of those suffering even severe cognitive disabilities. A person with advanced Alzheimer’s disease, for example, has not undergone a change of nature—he is not a creature different in species or otherwise different in kind from what he was before the onset of the disease. Bearers of fundamental dignity and basic rights, which includes all human beings, must not be treated as mere objects or instruments by, for example, subjecting them to damaging or deadly experimentation designed for the benefit of others. So the question at the heart of debates over human embryo research is the empirical one, fully accessible to inquiry using scientific methods of analysis: Is the human embryo, from the formation of the zygote forward, a human being, viz., a living member of the species Homo sapiens. George and Tollefsen assess the evidence and conclude that the answer to that question is unambiguously yes. (shrink)

The creation of embryos for research use has drawn a great deal of criticism. It is difficult to defend an ethical distinction between what one can do to "spare" embryos and what one can do to "research" embryos. The strongest ground on which to argue against the creation of embryos for research is a symbolic one, having to do with respect for human life. Ronald Dworkin's work in Life's Dominion on the symbolic meaning of the abortion debate throws a helpful (...) light on this dispute. By understanding the basic question to be, Does the creation of research embryos weaken or insult our communal respect for the sanctity of human life in some way that in vitro fertilization (IVF) or the experimental use of "spare" embryos does not?, the debate can move in a more constructive direction. (shrink)

Beyond the well‐known ethical issues involved in medical experimentation on human subjects, experimenting with embryos raises unique and particularly hard problems. Beside the psychological obstacles connected with the fear of ‘‘playing God" and the awe with which we hold the process of the creation of human beings, there are three philosophical problems which are the main subject of the article:1. The logical problem of circularity: the morality of experimenting on embryos is dependent on the status of the embryo, (...) which in turn is partly decided by experimentation.2. The metaphysical problem: experiments are justified by the benefits they bring to human subjects; but it is doubtful whether an early embryo is a ‘‘subject" and whether coming into being is a ‘‘benefit".3. The moral problem: the standard constraint on medical experiments is that they benefit either the individual subject or at least members of a relevantly defined group of patients suffering from the same syndrome. But embryo experimentation is often associated with potential cure to people of a completely different category .Finally, the article discusses the limits of the force of philosophical arguments in the formation of actual policies for regulating such practices as experimenting with embryos. The widely‐shared fourteen‐day limit is shown to be a sound practical compromise despite the difficulties in justifying it philosophically. (shrink)

Beyond the well‐known ethical issues involved in medical experimentation on human subjects, experimenting with embryos raises unique and particularly hard problems. Beside the psychological obstacles connected with the fear of ‘‘playing God" and the awe with which we hold the process of the creation of human beings, there are three philosophical problems which are the main subject of the article:1. The logical problem of circularity: the morality of experimenting on embryos is dependent on the status of the embryo, (...) which in turn is partly decided by experimentation.2. The metaphysical problem: experiments are justified by the benefits they bring to human subjects; but it is doubtful whether an early embryo is a ‘‘subject" and whether coming into being is a ‘‘benefit".3. The moral problem: the standard constraint on medical experiments is that they benefit either the individual subject or at least members of a relevantly defined group of patients suffering from the same syndrome. But embryo experimentation is often associated with potential cure to people of a completely different category.Finally, the article discusses the limits of the force of philosophical arguments in the formation of actual policies for regulating such practices as experimenting with embryos. The widely‐shared fourteen‐day limit is shown to be a sound practical compromise despite the difficulties in justifying it philosophically. (shrink)

The philosophical debate surrounding the moral status of the embryo has reached the public arena. The author of this paper examines some of the common arguments against embryo experimentation, including an influential article by Professor Ian Kennedy. He concludes that these arguments do not succeed in demonstrating that the intentional creation of embryos for research purposes is wrong, unless they also succeed in demonstrating that contemporary liberal abortion laws are also wrong. The author also criticises the conclusions (...) of the Warnock Report, and suggests that the reasons for permitting embryo research must be given a wider public audience. (shrink)

One major milestone in the development of the sea urchin embryo is the assembly of a single cilium on each blastomere just before hatching. These cilia are constructed both from pre‐existing protein building blocks, such as tubulin and dynein, and from a number of 9+2 architectural elements that are synthesized de novo at ciliogenesis. The finite or quantal synthesis of certain key architectural proteins is coincident with ciliary elongation and proportional to ciliary length. Upon deciliation, the synthesis of architectural (...) proteins occurs anew, a new cilium grows, and the stores of various building blocks are replenished. This routine of coordinated ciliary gene expression may be replayed experimentally many times without delaying normal development. The ability to regenerate cilia has allowed elucidation of these various protein synthetic relationships and has led to the discovery of the pathways by which membrane‐associated tubulin and axoneme‐associated architectural proteins are conveyed into the highly compartmentalized growing cilium. The sea urchin embryo thus provides a very convenient model system for studies of ciliary assembly and maintenance, coordinate gene expression and membrane dynamics. (shrink)

Issues surrounding human embryos are poignant and profound. Should research be conducted on them? Should they be discarded? Should they be donated to infertile couples? The Warnock Report was a landmark in providing guidelines limiting experimentation on human embryos to the first 14 days after fertilization, at which time implantation of the embryo is complete and the primitive streak has appeared.2 However, these embryological features were not considered sufficiently distinctive to bestow upon this 14‐day period a separate classification. (...) This situation changed when, in 1986, Anne McLaren suggested the use of the terms ‘pre‐embryo’ or ‘conceptus' to designate “the entire product of the fertilized egg up to the end of the implantation stage” and the term ’embryo‘ for “that small part of the pre‐embryo or conceptus, first distinguishable at the primitive streak stage, that later develops into the foetus.”3 In this paper we look critically at the term ‘pre‐embryo’, and we shall present the case for an alternative set of terms, namely, embryo‐placenta and embryo‐fetus. We consider this latter to be biologically‐based terminology, that does not have any connotation of restricted moral value as the term pre‐embryo does for some. (shrink)

It is becoming increasingly apparent that human embryo research has the very real potential to generate significant humanitarian benefits. Equally, it is clear that the destruction of embryos that such research inevitably involves is highly controversial within societies such as ours, where many hold either that from the moment of conception the embryo is morally considerable or that as a member of the human species it should not be treated as a mere means. How might we balance the (...) potential humanitarian benefits of embryo research against the various strongly felt moral objections to such use?In this rich and highly sophisticated work, Guenin argues for the experimental use of a bounded range of embryos, namely those which were intentionally produced for research ex utero and for which the progenitor has explicitly banned any intrauterine transfer. He argues that since they are not possible persons, it is morally permissible to perform experiments on this set of embryos .1 Indeed, he suggests that given the suffering that such research might relieve, it would be uncaring for us not to undertake it .As one might expect, the focus of the book is primarily on stem cell research. The ‘pluripotent’ stem cells one finds in …. (shrink)

Issues surrounding human embryos are poignant and profound. Should research be conducted on them? Should they be discarded? Should they be donated to infertile couples? The Warnock Report was a landmark in providing guidelines limiting experimentation on human embryos to the first 14 days after fertilization, at which time implantation of the embryo is complete and the primitive streak has appeared.2 However, these embryological features were not considered sufficiently distinctive to bestow upon this 14‐day period a separate classification. (...) This situation changed when, in 1986, Anne McLaren suggested the use of the terms ‘pre‐embryo’ or ‘conceptus' to designate “the entire product of the fertilized egg up to the end of the implantation stage” and the term ’embryo‘ for “that small part of the pre‐embryo or conceptus, first distinguishable at the primitive streak stage, that later develops into the foetus.”3In this paper we look critically at the term ‘pre‐embryo’, and we shall present the case for an alternative set of terms, namely, embryo‐placenta and embryo‐fetus. We consider this latter to be biologically‐based terminology, that does not have any connotation of restricted moral value as the term pre‐embryo does for some. (shrink)

This essay has two purposes. The first is to argue that our moral duties towards human embryos should be assessed in light of the Golden Rule by asking the normative question, “how would I want to be treated if I were an embryo?” Some reject the proposition “I was an embryo” on the basis that embryos should not be recognized as persons. This essay replies to five common arguments denying the personhood of human embryos: (1) that early human (...) embryos lack ontological individuation; (2) that they are members of the species Homo sapiens but not yet human persons; (3) that the argument for personhood commits the “heap argument” fallacy; (4) that since human procreation in nature is inefficient, human embryos cannot be persons; and (5) the “burning building” scenario proves that all arguments for personhood are irrational or inconsistent. The second purpose is to set forth and criticize in light of the normative judgement defended in part one the present legal situation of cryo-preserved embryos in the U.S. The essay ends by proposing legislative reforms to protect ex utero human embryos. (shrink)

Both experimental and therapeutic uses of the new reproductive technologies have been governed not by the medical ideology of the best interests of patients and their children, but by the market ideology of profit maximization under the guise of "reproductive liberty." Government in our constitutional, democratic society has the authority and obligation to make and enforce reasonable regulations to manage the new reproductive market in order to protect the interests of the public, prospective parents, and their future children. The "cloning" (...) debate provides a useful opportunity to compare and contrast the competing regulatory models of the free market, professional guidelines, and government restrictions. (shrink)

This article traces how embryo research has been theorized in Canada from the late 1980s to the current day. We find that research on human embryos has gradually come to be viewed in dichotomous terms, with scientific research pulled apart from experimentation to improve assisted reproduction procedures within fertility clinics. This distinction has been made manifest most clearly in the federal government’s 2007 consent regulations. The distinction between ‘improvement of assisted reproduction procedures’ and ‘research’ is problematic on two (...) accounts. First, interviews reveal that many Canadian IVF patients do not distinguish between the improvement of assisted reproduction and broader conceptions of ‘research’. This suggests that patients may be consenting to participate in embryo experimentation even where they do not understand its purposes. Second, the dichotomy may allow researchers and clinicians to evade research protocols that might otherwise apply in Canadian law. This could permit fertility clinics to conduct what might in other contexts fall under the category of ‘research’ without prescribed oversight, and may even enable clinicians and researchers to engage in practices that policymakers deliberately sought to proscribe. We call for a re-evaluation of the legal distinctions on embryo experimentation built into Canadian law, and indeed built into broader discussions of embryo research. (shrink)

It has become common, in both popular and scholarly discourse, to appeal to ‘delayed animation’ as an argument for abortion (DAAA). Augustine and Aquinas seemingly held that the rational soul was infused midway in pregnancy, and therefore did not regard early abortion as homicide. The authority of these thinkers is thus cited by some contemporary Christians as a reason to tolerate or, for proportionate reasons, to promote first-trimester abortion and embryo experimentation. The present essay is an exercise in (...) aetiology. It examines the origins of DAAA. Distinctions are drawn between different forms of DAAA in historical context, premises, and conclusions. Some forms raise important anthropological questions, though these arguments are not indefeasible. The most popular forms of DAAA, which are typically framed as appeals to precedent, are the weakest, in that there is little precedent for DAAA before 1950. The argument is in fact a novelty in the tradition. (shrink)

It is becoming increasingly apparent that human embryo research has the very real potential to generate significant humanitarian benefits. Equally, it is clear that the destruction of embryos that such research inevitably involves is highly controversial within societies such as ours, where many hold either that from the moment of conception the embryo is morally considerable or that as a member of the human species it should not be treated as a mere means. How might we balance the (...) potential humanitarian benefits of embryo research against the various strongly felt moral objections to such use?In this rich and highly sophisticated work, Guenin argues for the experimental use of a bounded range of embryos, namely those which were intentionally produced for research ex utero and for which the progenitor has explicitly banned any intrauterine transfer. He argues that since they are not possible persons, it is morally permissible to perform experiments on this set of embryos.1 Indeed, he suggests that given the suffering that such research might relieve, it would be uncaring for us not to undertake it.As one might expect, the focus of the book is primarily on stem cell research. The ‘pluripotent’ stem cells one finds in …. (shrink)

The ascidian embryo has long provided a model system for ‘mosaic’ development. This article reviews recent advances in the study of ascidian developmental biology. These include: (a) the re‐analysis of cell lineages in ascidian embryos with the ascertainment of developmental fates of every blastomere of a 110‐cell embryo; (b) the development of several tissue‐specific monoclonal antibodies; (c) the investigation and description of cell cycle requirements for differentiation; it has been found that neither cytokinesis nor nuclear division is required (...) for differentiation, but that several rounds of DNA replication are essential for the expression of certain tissue‐specific genes; and (d) the demonstration by new descriptive and experimental studies of the presence of cytoplasmic factors or determinants responsible for specification of embryonic cell features; myoplasm which is thought to contain muscle determinants has been isolated, and immunological attempts to elucidate the molecular nature of the factors have begun. (shrink)

Harvesting human embryonic stem (hES) cells is a highly controversial field of research because it rests on the destruction of human embryos. Altering the procedure of nuclear transfer (NT) is suggested to generate hES cell lines without ethical obstacles by claiming that no embryo would be involved. While discussing the nature of an embryo and related central questions concerning their moral status and the respect they deserve, this paper argues that the entity created by somatic cell nuclear transfer (...) (SCNT) or altered nuclear transfer (ANT) is an embryo and has the same moral status as a natural embryo. Respect for the embryo is expressed by the ethical principles of proportionality, probability and subsidiarity. This paper argues that the human embryo should only be taken for research with high ranking goals, which are proven in animal experimentation and for which there are no alternatives. This makes ANT obsolete and shows that SCNT to produce hES cells is premature at the present time. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Future Directions for Human Cloning by Embryo Splitting:After the HullabalooCynthia B. Cohen (bio)In October 1993, a paper entitled, "Experimental Cloning of Human Polyploid Embryos Using an Artificial Zona Pellucida," was presented at a joint meeting of the American Fertility Society and the Canadian Fertility and Andrology Society. Although it was awarded a prize, its authors, who are affiliated with George Washington University, decided against calling a press conference (...) to announce their findings. Word of their experiment soon leaked out, however, and the New York Times blazoned on its front page that human embryo cloning had been achieved. The story was accompanied by a diagram of cloning by nuclear transplantation.Newspapers and television networks around the world picked up the story and embellished it. The idea of unlimited, xeroxed copies of human beings gripped the public imagination. Wild scenarios of hundreds of Hitlers plotting to take over the world and of clones giving birth to their own twins enlivened media reports. Only gradually did it become clear that the term "polyploid" in the title of the paper referred to abnormal embryos that could never develop into living human beings and that "cloning" referred to embryo splitting or twinning, not to nuclear transplantation or the transfer of a donor nucleus into an enucleated egg. Once this sank into public consciousness, the "hullabaloo," as Dr. Howard W Jones, Jr., called it, died down.It left in its wake unanswered questions about the ethics of splitting embryos. During the height of the publicity given to the George Washington experiment, newspaper and TV stories had not delved in any depth into the ethical issues it raised. Ethicists, given limited time to discuss the ethical questions at stake, had been quoted in quick, simplistic responses. Some had offered little analysis of the rights and wrongs of embryo splitting, but, revealing tremendous creative talent, had spun out [End Page 187] imaginary and frightening applications of the procedure. This was a story essentially about ethics in which ethics was never really discussed.The National Advisory Board on Ethics in Reproduction* (NABER), an independent, multidisciplinary group that addresses ethical issues in modern reproductive science, technology, and care, became concerned about the sparsity of reflective ethical debate about embryo splitting. NABER's chair, Albert Jonsen, observed that "reporters phoning ethicists for comment and ethicists appearing on talk shows do not a debate make. Debate requires face to face (or at least essay to essay) argument among persons sharing the same information. This has yet to take place." Consequently, NABER decided to convene a workshop on human cloning by embryo splitting at the National Academy of Sciences in February 1994. The board invited participants who would provide a broad range of opinion about the ethical and public policy issues entailed by human embryo splitting. Embryologists, ethicists, reproductive biologists, public policy experts, staff from the National Institutes of Health (NIH), legal scholars, journalists, and infertility specialists were among those who participated. The feature articles in this issue of the Kennedy Institute of Ethics Journal derive from that workshop. Their authors were given free rein to take whatever stance they deemed ethically supportable.The first article is designed to provide some understanding of the science of human cloning as a basis for exploring the ethical issues raised by this set of techniques. Jacques Cohen, a leading reproductive embryologist, and Giles Tomkin, a science writer, both of Cornell University Medical School, explain, in a way that is clear to laypersons and biologists alike, the meaning, nature, and function of cloning. They discuss recent: advances in this area and offer an assessment of feasible uses of human cloning procedures, hoping to dispel what they view as mistaken fears about its future applications. Dr. Howard W Jones, Jr., a pioneer infertility specialist, briefly comments on Cohen and Tomkin's paper, pointing out that embryo splitting may not improve pregnancy results if genetic heterogeneity is required for successful embryo transfer and implantation.In the next article, three major ethical arguments against human cloning by embryo splitting are analyzed and rejected by Ruth Macklin, an expert in reproductive ethics from Albert Einstein College of Medicine. She finds the first argument, that the worth of individuals... (shrink)

In bioethics as in the sciences, enormous discussions often concern the very small. Central to public debate over emerging reproductive and regenerative biotechnologies is the question of the moral status of the human embryo. Because news media have played a prominent role in framing the vocabulary of the debate, this study surveyed the use of language reporting on human embryo research in news articles spanning a two-year period. Terminology that devalued moral status—for example, the descriptors things, property, tissue, (...) or experimental material —was found to outnumber fivefold those that affirmed any degree of moral status above that of inanimate cellular matter; for example, living, human life, or human being. A quarter of the articles failed to note that the embryos under discussion were human. These findings confirm that even among scientific and philosophical experts a diversity of opinion exists on society's moral obligations to nascent human life. The skewed linguistic distribution also indicates a distinct bias. Concerned readers should take notice when any category of humanity becomes subject to prejudicial and disparaging language and the value of vulnerable human life is trivialized alongside sensational assertions of anticipated medical cures. The responsibility for holding the media to a higher standard of truth and fairness falls to us all. (shrink)

Gastrulation is the process of early development that reorganizes cells into the three fundamental tissue types of ectoderm, mesoderm, and endoderm. It is a coordinated series of morphogenetic and molecular changes that exemplify many developmental phenomena. In this review, we explore one of the classic developmental systems, the sea urchin embryo, where investigators from different backgrounds have converged on a common interest to study the origin, morphogenesis, and developmental regulation of the endoderm. The sea urchin embryo is remarkably (...) plastic in its developmental potential, and the endoderm is especially instructive for its morphological and molecular responsiveness to inductive cell interactions. We start by examining and integrating the several models for the morphogenetic mechanisms of invagination and tissue elongation, the basic processes of endoderm morphogenesis in this embryo. We next critique the proposed mechanisms of inductive gene regulation in the endoderm that exemplifies a concept of modular transcriptional regulation. Finally, we end with an examination of the current molecular models to explain cell fate determination of the endoderm. Recent progress at the molecular level should soon allow us to explain the seminal experimental observations made in this embryo over a hundred years ago. BioEssays 21:459–471, 1999. © 1999 John Wiley & Sons, Inc. (shrink)

Tendencies and efforts have shifted from genome description, DNA mapping, and DNA sequencing to active and profound re-programming, repairing life on genetic and molecular levels in some parts of contemporary life science research. Mirroring and materializing this atmosphere, various life engineering technologies have been used and established in many areas of life sciences in the last decades. A contemporary progressive example of one such technology is DNA editing. Novel developments related to reproductive technologies, particularly embryo editing, prenatal human life (...) engineering, and germline engineering need to be analyzed against the broader social and structural background. The crucial analytical scope for this paper is a specific field: the life-editing technologies used in reproductive medicine and performed experimentally on viable human embryos, particularly CRISPR/cas9 technology. This text argues that germline editing technologies, as a representative part of contemporary biomedicine, are merging ideas of treatment and enhancement to avoid future risks. Using this specific life manipulation of embryos and gametes, the text analyzes these processes within the concept of power over life—biopower and the specific governing rationality that imagines, classifies, and governs contemporary societies. The text specifically focuses on the potential to create, define, and manage future risks and uncertainties related to prenatal life. (shrink)

A major obstacel to the study of mammalian development, and to the practical application of knowledge gained from it in the clinic during therapeutic in vitro fertilisation and embryo transfer (IVF‐ET), is the propensity of embryos to become retarded or arrested during their culture in vitro. The precise developmental cell cycle in which embryos arrest or delay is characteristic for the species and coincides with the earliest period of embryonic gene expression. Much evidence reviewed here implicates free oxygen radicals (...) (FORs) in the process of arrest. Thus, studies on the development of mouse preimplantation embryos in vitro have shown that (i) FORs are elevated in vitro, but not in vivo, at the time at which embryos become arrested or delayed, (ii) systems for removing reactive oxygen species to limit the formation of hydroxy radicals are present, although they have not yet been assessed quantitatively and may differ qualitatively from those in adult cells, (iii) metabolic and possibly genetic adaptations to oxidative damage are evident, (iv) published procedures for overcoming in vitro arrest are explicable in terms of FOR‐mediated damage or responses and (v) the arrest or delay of most embryos in vitro can be reduced or prevented experimentally by addition of metal chelators to limit hydroxy radical formation and lipid hydroperoxidation. (shrink)