Bjarki Johannesson, NYSCF

This colony of embryonic stem cells, created from a type 1 diabetes patient, is one of the first to be cloned from an adult human.

Two research groups have independently produced human embryonic stem-cell lines from embryos cloned from adult cells. Their success could reinvigorate efforts to use such cells to make patient-specific replacement tissues for degenerative diseases, for example to replace pancreatic cells in patients with type 1 diabetes. But further studies will be needed before such cells can be tested as therapies.

The first stem-cell lines from cloned human embryos were reported in May last year by a team led by reproductive biology specialist Shoukhrat Mitalipov of the Oregon Health & Science University in Beaverton (see 'Human stem cells created by cloning'). Those cells carried genomes taken from fetal cells or from cells of an eight-month-old baby1, and it was unclear whether this would be possible using cells from older individuals. (Errors were found in Mitalipov's paper, but were not deemed to affect the validity of its results.)

Now two teams have independently announced success. On 17 April, researchers led by Young Gie Chung and Dong Ryul Lee at the CHA University in Seoul reported inCell Stem Cell that they had cloned embryonic stem-cell (ES cell) lines made using nuclei from two healthy men, aged 35 and 752. And in a paper published on Nature's website today, a team led by regenerative medicine specialist Dieter Egli at the New York Stem Cell Foundation Research Institute describes ES cells derived from a cloned embryo containing the DNA from a 32-year-old woman with type 1 diabetes. The researchers also succeeded in differentiating these ES cells into insulin-producing cells3.

To produce the cloned embryos, all three groups used an optimized version of the laboratory technique called somatic-cell nuclear transfer (SCNT), where the nucleus from a patient's cell is placed into an unfertilized human egg which has been stripped of its own nucleus. This reprograms the cell into an embryonic state. SCNT was the technique used to create the first mammal cloned from an adult cell, Dolly the sheep, in 1996.

The studies show that the technique works for adult cells and in multiple labs, marking a major step. It's important for several reasons, says Robin Lovell-Badge, a stem-cell biologist at the MRC National Institute for Medical Research in London.

At present, studies to test potential cell therapies derived from ES cells are more likely to gain regulatory approval than those testing therapies derived from induced pluripotent stem (iPS) cells, which are made by adding genes to adult cells to reprogram them to an embryonic-like state. Compared with iPS cells, ES cells are less variable, says Lovell-Badge. Therapies for spinal-cord injury and eye disease using non-cloned ES cells have already been tested in human trials. But while many ES cell lines have been made using embryos left over from fertility treatments, stem cells made from cloned adult cells are genetically matched to patients and so are at less risk of being rejected when transplanted.

Lovell-Badge says cloned embryos could also be useful in other ways, in particular to improve techniques for reprogramming adult cells and to study cell types unique to early-stage embryos, such as those that go on to form the placenta.

Few, however, expect a huge influx of researchers making stem cells from cloned human embryos. The technique is expensive, technically difficult and ethically fraught. It creates an embryo only for the purpose of harvesting its cells. Obtaining human eggs also requires regulatory clearance to perform an invasive procedure on healthy young women, who are paid for their time and discomfort.

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Stem cells made by cloning adult humans

Scientists have used cloning technology to make stem cells from a woman with Type 1 diabetes that are genetically matched to her and to her disease.

They hope to someday use such cells as tailor-made transplants to treat or potentially even cure the disease, which affects millions and which now has few treatment options other than careful diet and regular use of insulin.

Its the second report his month of success in using cloning technology to make human embryonic stem cells the cells that eventually create a complete human being and that scientists hope to harness to treat diseases ranging from diabetes to Parkinsons and injuries that cause paralysis or organ damage.

I think this is going to become reality, Dr. Dieter Egli of the New York Stem Cell Foundation, whose report is published in the journal Nature on Monday, told reporters. It may be a bit in the future but it is going to happen.

The technique they use is called somatic cell nuclear transfer the same method used to make Dolly, the sheep who was the first mammal to be cloned, in 1996. Scientists remove the nucleus from a normal cell, clear the nucleus from a human egg cell, then inject the nucleus from the skin cell into the egg.

I think this is going to become reality."

Various chemical or electrical tricks can be used to start the egg growing as if it had been fertilized by sperm. In this case, they used DNA from a woman with Type 1 diabetes, and they said they used an improved method to trick the egg into developing.

It got to whats called a blastocyst a ball of cells that has not yet begun to differentiate into the different types of cells and tissues in the body, such as nerve cells, blood cells and bone cells. They removed individual cells and used various chemical baths to direct them to form into the desired cell type the beta cells in the pancreas that make insulin and that are destroyed in diabetes. These cells carry the patients own unique DNA, including whatever genetic mistakes led to her diabetes.

These stem cells could therefore be used to generate cells for therapeutic cell replacement, they wrote in their report.

Scientists have cloned sheep, pigs, mice and monkeys, but its been far harder to clone human beings. Its partly because of the controversy few people advocate cloning humans for the purpose of making babies, and many people object to destroying a human embryo, even one that only ever existed in a lab dish.

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Stem Cells Made From Cloning Diabetic Woman

Scientists have used cloning technology to make stem cells from a woman with Type 1 diabetes that are genetically matched to her and to her disease.

They hope to someday use such cells as tailor-made transplants to treat or potentially even cure the disease, which affects millions and which now has few treatment options other than careful diet and regular use of insulin.

Its the second report his month of success in using cloning technology to make human embryonic stem cells the cells that eventually create a complete human being and that scientists hope to harness to treat diseases ranging from diabetes to Parkinsons and injuries that cause paralysis or organ damage.

I think this is going to become reality, Dr. Dieter Egli of the New York Stem Cell Foundation, whose report is published in the journal Nature on Monday, told reporters. It may be a bit in the future but it is going to happen.

The technique they use is called somatic cell nuclear transfer the same method used to make Dolly, the sheep who was the first mammal to be cloned, in 1996. Scientists remove the nucleus from a normal cell, clear the nucleus from a human egg cell, then inject the nucleus from the skin cell into the egg.

I think this is going to become reality."

Various chemical or electrical tricks can be used to start the egg growing as if it had been fertilized by sperm. In this case, they used DNA from a woman with Type 1 diabetes, and they said they used an improved method to trick the egg into developing.

It got to whats called a blastocyst a ball of cells that has not yet begun to differentiate into the different types of cells and tissues in the body, such as nerve cells, blood cells and bone cells. They removed individual cells and used various chemical baths to direct them to form into the desired cell type the beta cells in the pancreas that make insulin and that are destroyed in diabetes. These cells carry the patients own unique DNA, including whatever genetic mistakes led to her diabetes.

These stem cells could therefore be used to generate cells for therapeutic cell replacement, they wrote in their report.

Scientists have cloned sheep, pigs, mice and monkeys, but its been far harder to clone human beings. Its partly because of the controversy few people advocate cloning humans for the purpose of making babies, and many people object to destroying a human embryo, even one that only ever existed in a lab dish.

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Diabetic Woman's Cells Are Turned Into Embryonic Stem Cells

(CNN) For the first time, cloning technologies have been used to generate stem cells that are genetically matched to adult patients.

Fear not: No legitimate scientist is in the business of cloning humans. But cloned embryos can be used as a source for stem cells that match a patient and can produce any cell type in that person.

Researchers in two studies published this month have created human embryos for this purpose. Usually an embryo forms when sperm fertilizes egg; in this case, scientists put the nucleus of an adult skin cell inside an egg, and that reconstructed egg went through the initial stages of embryonic development.

This is a dream that weve had for 15 years or so in the stem cell field, said John Gearhart, director of the Institute for Regenerative Medicine at the University of Pennsylvania. Gearhart first proposed this approach for patient-specific stem cell generation in the 1990s but was not involved in the recent studies.

Stem cells have the potential to develop into any kind of tissue in the human body. From growing organs to treating diabetes, many future medical advances are hoped to arise from stem cells.

Scientists wrote in the journal Cell Stem Cell this month that they used skin cells from a man, 35, and another man, 75, to create stem cells from cloned embryos.

We reaffirmed that it is possible to produce patient-specific stem cells using a nuclear transfer technology regardless of the patients age, said co-lead author Young Gie Chung at the CHA Stem Cell Institute in Seoul, South Korea.

On Monday, an independent group led by scientists at the New York Stem Cell Foundation Research Institute published results in Nature using a similar approach. They used skin cells from a 32-year-old woman with Type 1 diabetes to generate stem cells matched to her.

Both new reports follow the groundbreaking research published last year by Shoukhrat Mitalipov and colleagues at Oregon Health & Science University in the journal Cell. In that study, researchers produced cloned embryos and stem cells using skin cells from a fetus and an 8-month-old baby.

Its a remarkable process that gives us these master cells, these stems cells that are essentially the seeds for all of the tissues in our bodies, said George Daley, director of the Stem Cell Transplantation Program at Boston Childrens Hospital, who was not involved in the recent studies. Thats why its so important for medical research.

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Cloning used to make stem cells from adult humans

And now there are three: in the wake of announcements from laboratories in Oregon and California that they had created human embryos by cloning cells of living people, a lab in New York announced on Monday that it had done that and more.

In addition to cloning the cells of a woman with diabetes, producing embryos and stem cells that are her perfect genetic matches, scientists got the stem cells to differentiate into cells able to secrete insulin.

That raised hopes for realizing a long-held dream of stem cell research, namely, creating patient-specific replacement cells for people with diabetes, Parkinson's disease, heart failure and other devastating conditions. But it also suggested that what the Catholic Church and other right-to-life advocates have long warned of - scientists creating human embryos to order - could be imminent.

The trio of successes "increases the likelihood that human embryos will be produced to generate therapy for a specific individual," said bioethicist Insoo Hyun of Case Western Reserve University School of Medicine in Cleveland. And "the creation of more human embryos for scientific experiments is certain."

The accelerating progress in embryonic stem cell research began last May. Scientists, led by Shoukhrat Mitalipov of Oregon Health & Science University, reported they had created healthy, early-stage human embryos - hollow balls of about 150 cells - by fusing ova with cells from a fetus, in one experiment, and an infant in another.

Earlier this month, scientists at the CHA Stem Cell Institute in Seoul, South Korea, announced they had managed the same feat with skin cells from two adult men.

In each case, scientists used a version of the technique that created the sheep Dolly in 1996, the first clone of an adult mammal. Called somatic cell nuclear transfer (SCNT), the recipe calls for removing the nuclear DNA from an ovum, fusing it with a cell from a living person, and stimulating each ovum to begin dividing and multiplying. The resulting embryo includes stem cells that can differentiate into any human cell type.

While that sounds simple enough, immense technical hurdles kept scientists from achieving human SCNT over more than a decade of attempts. Now that they have a reliable recipe, including the right nutrients to sustain the eggs and the right timing to start it dividing, they have "a reproducible, reliable way to create patient-specific stem cells" via cloning, said Dr. Robert Lanza, chief scientific officer of Advanced Cell Technology and co-author of the CHA paper.

INCURABLE DISEASE

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Cloned embryos yield stem cells for diabetes