The controversies behind human cloning

InIan Wilmut effectively derived the first embryonic stem cells using SCNT in a mammal and effectively cloned the first mammal—Dolly the sheep [4]. This is primarily because of the technical challenges and ethical controversy arising from the procuring of human eggs solely for research purposes.

Cloning: How, why ... and why not

Looking back, in more than a half-century of research, reprogramming experiments have demonstrated the remarkable flexibility of our cells to be converted into different cell types that can serve as the basis for regenerative therapies.

Prior to implantation of the fertilized egg into the uterus of the surrogate mother, the inner cell mass of the egg can be removed, and the cells can be grown in culture to form an embryonic stem cell line generations of cells originating from the same group of parent cells.

In sum, the issue of pathogenic transmission is in the process of being solved, bringing one step further the potential for clinical application of therapeutic cloning in cell replacement therapy.

Ethics of cloning

Ethical controversy on the source and destruction of embryos as well as the contradictory legislations and scarcity of funding contribute to impede advancements in therapeutic cloning. Lanza said the chances of success look somewhat better if you look only at cloned animal embryos judged worthy of implanting in the uterus.

In addition, the development of induced pluripotent stem cellswhich are derived from somatic cells that have been reprogrammed to an embryonic state through the introduction of specific genetic factors into the cell nuclei, has challenged the use of cloning methods and of human eggs.

The guidelines were not legally binding but laid the foundation for stem cell research principles for many scientists and their laboratories. This technique, which was later refined and became known as somatic cell nuclear transfer SCNTrepresented an extraordinary advance in the science of cloning, because it resulted in the creation of a genetically identical clone of an already grown sheep.

Reproductive cloning using SCNT is considered very harmful since the fetuses of embryos cloned through SCNT rarely survive gestation and usually are born with birth defects. Their names were Fusion and Copy. Lanza said cloned offspring have evidenced dozens of health problems, including obesity, seizures, tumors, severe cardiovascular problems, thymus problems and joint problems.

For instance, patient-specific cardiomyocytes produced through SCNT will not integrate into the scarred heart tissue resulting from myocardial infarction. This paper revolutionized the field of cellular reprogramming because it provided an effective alternative to deriving cells equivalent to embryonic stem cells.

This famous lamb, named Dolly, brought cloning into the limelight. Theoretically, if pluripotent stem cells, i. Scientists such as Doug Melton have sought to explore the possibility of bypassing the pluripotent state altogether and directly reprogram one cell type to another.

Gurdon modified his experimental procedure to conduct serial nuclear transplantations in which he took the already transplanted nuclei, and transplanted them again. Knowing this, we can then try to drive stem cells such as pluripotent stem cells to differentiate into a cell type that we are interested in obtaining.

After taking your computer to the engineers, the engineers discover that a few of the small components of the motherboard are faulty, so they decide to replace it.

ScienceStruck Staff Last Updated: The embryo develops into a fetus that is then carried to term. This is a legitimate concern in some species and uses, such as in dairy cattle, in which one bull may sire thousands of offspring.

Thus, large-scale cloning might prove to be a serious blow to the entire human race in future. As reported by Nagy and Chang, artificial gametes 32 can be created by haploidization, through SCNT into an enucleated oocyte ready to undergo meiosis upon induction.

After the donor somatic cell genetic material is transferred into the host oocyte with a micropipette, the somatic cell genetic material is fused with the egg using an electric current. Likewise, the production of stem cells from human embryos has been fraught with the challenge of maintaining embryo viability.

Scientific organizations like the American Academy for the Advancement of Sciences have spoken in favor of a ban on human cloning until it can be done safely. Barberi et al derived, by SCNT with somatic nuclei from mouse cumulus and tail-tip cells, two ntESC lines which were induced to differentiate into motor, GABAminergic, serotonergic and dopaminergic neurons 11 forming synapses and displaying normal electrophysiological properties in vitro.

The Raelians, meanwhile, believe that humans could achieve a kind of immortality by cloning themselves, then somehow transferring their consciousness from one generation to the next.

Importantly, it suggested that cells retain all of their genetic material even as they divide and differentiate although some wondered if the donor DNA came from a stem cell, which can differentiate into multiple types of cells. Many human-specific signaling pathways have been discovered by studying human embryonic stem cells.

Chinen J, Puck JM. Adult phenotype in the mouse can be affected by epigenetic events in the early embryo. While SCNT is used for cloning animals, it can also be used to generate embryonic stem cells.

Should parents choose the traits of a future child as is possible with cloning? Porcine endogenous retrovirus integration sites in the human genome: Although a viable nonhuman primate has not yet been produced by SCNT, the success of Mitalipov and Wolf in creating a monkey by embryonic cloning from the nucleus of an allogenic blastomere supported the possibility that, through gene targeting, genetic defects can be reproduced in a wild-type genome to express a loss of function Reproductive cloning experiments were performed for more than 40 years through the process of embryo splitting, in which a single early-stage two-cell embryo is manually divided into two individual cells and then grows as two identical embryos.

An important fact - how will the cloned individual might react and behave with regards to his family and parents?In bioethics, the ethics of cloning refers to a variety of ethical positions regarding the practice and possibilities of cloning, especially human cheri197.com many of these views are religious in origin, some of the questions raised by cloning are faced by secular perspectives as well.

Perspectives on human cloning are theoretical, as human therapeutic and reproductive cloning are not. The Controversy Behind Human cloning essaysThe Controversy behind Human Cloning On Sunday November 25, a Massachusetts Cell Technology Firm based in Worcester announced that an elite group of their scientists had begun to make cloned human embryos.

This. Inthe California legislature declared a "five year moratorium on cloning of an entire human being" and requested that "a panel of representatives from the fields of medicine, religion, biotechnology, genetics, law, bioethics and the general public" be established to evaluate the "medical, ethical and social implications" of human cloning (SB ).

A major roadblock in the feasibility of human therapeutic cloning is the low availability of oocytes for research purposes. Currently, due to low SCNT efficiency, it is estimated that human oocytes would be needed in order to derive one observe patient-specific ntESC line.

The. Research into human embryo cloning has been driven primarily by the potential benefits of cloned tissue for treating disease, and the scientific mainstream has tried to discourage work in.

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The controversies behind human cloning
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