Reprogramming of HUMAN skin cells into EMBRYONIC stem cells

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ThaG

Sicc OG
Jun 30, 2005
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#1
Yes, that's right

SCNT is obsolete for therapeutic purposes now

I haven't read the paper because it will appear in the online edition of Science on Thursady, but this is the press-release

http://www.news.wisc.edu/14474
UW-Madison scientists guide human skin cells to embryonic state

Nov. 20, 2007

by Terry Devitt

In a paper to be published Nov. 22 in the online edition of the journal Science, a team of University of Wisconsin-Madison researchers reports the genetic reprogramming of human skin cells to create cells indistinguishable from embryonic stem cells.

The finding is not only a critical scientific accomplishment, but potentially remakes the tumultuous political and ethical landscape of stem cell biology as human embryos may no longer be needed to obtain the blank slate stem cells capable of becoming any of the 220 types of cells in the human body. Perfected, the new technique would bring stem cells within easy reach of many more scientists as they could be easily made in labs of moderate sophistication, and without the ethical and legal constraints that now hamper their use by scientists.

The new study was conducted in the laboratory of UW-Madison biologist James Thomson, the scientist who first coaxed stem cells from human embryos in 1998. It was led by Junying Yu of the Genome Center of Wisconsin and the Wisconsin National Primate Research Center.

"The induced cells do all the things embryonic stem cells do," explains Thomson, a professor of anatomy in the University of Wisconsin School of Medicine and Public Health. "It's going to completely change the field."

In addition to exorcising the ethical and political dimensions of the stem cell debate, the advantage of using reprogrammed skin cells is that any cells developed for therapeutic purposes can be customized to the patient.

"They are probably more clinically relevant than embryonic stem cells," Thomson explains. "Immune rejection should not be a problem using these cells."

An important caveat, Thomson notes, is that more study of the newly-made cells is required to ensure that the "cells do not differ from embryonic stem cells in a clinically significant or unexpected way, so it is hardly time to discontinue embryonic stem cell research."

The successful isolation and culturing of human embryonic stem cells in 1998 sparked a huge amount of scientific and public interest, as stem cells are capable of becoming any of the cells or tissues that make up the human body.

The potential for transplant medicine was immediately recognized, as was their promise as a window to the earliest stages of human development, and for novel drug discovery schemes. The capacity to generate cells that could be used to treat diseases such as Parkinson's, diabetes and spinal cord injuries, among others, garnered much interest by patients and patient advocacy groups.

But embryonic stem cells also sparked significant controversy as embryos were destroyed in the process of obtaining them, and they became a potent national political issue beginning with the 2000 presidential campaign. Since 2001, a national policy has permitted only limited use of some embryonic stem cell lines by scientists receiving public funding.

In the new study, to induce the skin cells to what scientists call a pluripotent state, a condition that is essentially the same as that of embryonic stem cells, Yu, Thomson and their colleagues introduced a set of four genes into human fibroblasts, skin cells that are easy to obtain and grow in culture.

Finding a combination of genes capable of transforming differentiated skin cells to undifferentiated stem cells helps resolve a critical question posed by Dolly, the famous sheep cloned in 1996. Dolly was the result of the nucleus of an adult cell transferred to an oocyte, an unfertilized egg. An unknown combination of factors in the egg caused the adult cell nucleus to be reprogrammed and, when implanted in a surrogate mother, develop into a fully formed animal.

The new study by Yu and Thomson reveal some of those genetic factors. The ability to reprogram human cells through well defined factors would permit the generation of patient-specific stem cell lines without use of the cloning techniques employed by the creators of Dolly.

"These are embryonic stem cell-specific genes which we identified through a combinatorial screen," Thomson says. "Getting rid of the oocyte means that any lab with standard molecular biology can do reprogramming without difficulty to obtain oocytes."

Although Thomson is encouraged that the new cells will speed new cell-based therapies to treat disease, more work is required, he says, to refine the techniques through which the cells were generated to prevent the incorporation of the introduced genes into the genome of the cells. In addition, to ensure their safety for therapy, methods to remove the vectors, the viruses used to ferry the genes into the skin cells, need to be developed.

Using the new reprogramming techniques, the Wisconsin group has developed eight new stem cell lines. As of the writing of the new Science paper, which will appear in the Dec. 21, 2007 print edition of the journal Science, some of the new cell lines have been growing continuously in culture for as long as 22 weeks.

The new work was funded by grants from the Charlotte Geyer Foundation and the National Institutes of Health. In addition to Yu and Thomson, authors of the new study include Maxim A. Vodyanik, Kim Smuga-Otto, Jessica Antosiewicz-Bourget, Jennifer L. Frane and Igor I. Slukvin, all of UW-Madison; and Shulan Tian, Jeff Nie, Gudrun A. Jonsdottir, Victor Ruotti and Ron Stewart, all of the WiCell Research Institute.
^^^discuss


I will say some things a little bit later
 
Jun 27, 2005
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Cant wait to grow my brother a new pancreas! Hopefully this will speed up the process, but I have a feeling some hillbilly from a billion dollar pentecostal mega church will find some way to turn this into some type of science vs God thing again and progress will be held up AGAIN.
 
Sep 28, 2002
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Why you keep maken me read so much?

Correct me if im wrong but you already have pluripotent cells in your bone marrow as an adult and they aren't stem cells for every cell type only blood and immune cells so a pluripotent stem cell derived from a skin cell would seem to be a germ cell of ectodermally derived cell types skin nervous tissue etc....
 
Apr 27, 2005
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I have a feeling some hillbilly from a billion dollar pentecostal mega church will find some way to turn this into some type of science vs God thing again and progress will be held up AGAIN.
i dont know about that man, this pretty much solves the problem that churches have with stem cell research.
 
Jun 27, 2005
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#5
i dont know about that man, this pretty much solves the problem that churches have with stem cell research.
You're right. But my thinking is that these simple minded fuckheads already have their minds made up the stem cells are "evil" because they have associated stem cells with killing babies for so many years already and they are not about to change their stance because "EEEEVIL SCIENTISTS" have made progress that fucks off their position.
 

ThaG

Sicc OG
Jun 30, 2005
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#6
Why you keep maken me read so much?

Correct me if im wrong but you already have pluripotent cells in your bone marrow as an adult and they aren't stem cells for every cell type only blood and immune cells so a pluripotent stem cell derived from a skin cell would seem to be a germ cell of ectodermally derived cell types skin nervous tissue etc....
these are EMBRYONIC STEM CELLS, not pluripotent

the original paper by Takahashi & Yamanaka from last summer described the induction of iPSCs (induced pluripotent stem cells) by four transcription factors - Oct4, Sox2, Myc and Klf4 (yeah, no Nanog)

Takahashi K, Yamanaka S. Induction of pluripotent stem cells from mouse embryonic and adult fibroblast cultures by defined factors. Cell. 2006 Aug 25;126(4):663-76. Epub 2006 Aug 10

but they weren't real ESCs

then in June 2007 came 4 papers like this one:

Wernig M, Meissner A, Foreman R, Brambrink T, Ku M, Hochedlinger K, Bernstein BE, Jaenisch R. In vitro reprogramming of fibroblasts into a pluripotent ES-cell-like state. Nature. 2007 Jul 19;448(7151):318-24. Epub 2007 Jun 6

where they made ESCs, but the mouse was engineered for selection purposes

and in August came this paper:

Meissner A, Wernig M, Jaenisch R. Direct reprogramming of genetically unmodified fibroblasts into pluripotent stem cells. Nat Biotechnol. 2007 Oct;25(10):1177-81. Epub 2007 Aug 27

with non-engineered mice

and now these are human cells (which are of course non-engineered) and therapeutic cloning is obsolete if they can really reprogram these cells...
 

ThaG

Sicc OG
Jun 30, 2005
9,597
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#7
i dont know about that man, this pretty much solves the problem that churches have with stem cell research.
This was the thing I wanted to comment on in the beginning, but from a slightly different perspective:

Yes, this will be a big triumph for science, a big fat middle finger for the wingnuts, telling them "You can do whatever you want, we are smart enough to overcome it"

But in the long run, this will turn against us and bite us back..

Because the truth is that they actually won. The opposition to destroying human embryos wins, because they will not be necessary for therapeutic purposes anymore and the limitations will not be lifted...

Which would be fine, if embryos weren't necessary for other purposes, but they are. Imagine that you want to study human development, which is almost entirely unexplored area precisely because of "ethical reasons". You're basically screwed forever...
 

ThaG

Sicc OG
Jun 30, 2005
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#11
interesting viewpoint:

http://scienceblogs.com/transcript/2007/11/some_thoughts_on_the_ips_cell.php

Yesterday was an action packed day. I got to lab early and made a major discovery. Then last night we had an excellent NERD Club meeting. Then as I walked into the front door at 9PM last night, my wife asks me "Did you hear the news?" Sure enough they have been able to make induced pluripotent strem cells (IPS cells) from human cells. Fantastic. As a biologist, I consider the very first and second experiments on mouse cells to be much more important, and the extension of the technique to another mammalian cell as being secondary.

Now a couple of additional points.

1) From initial rumours it seemed that human cells could not be converted to IPS cells with the technique used on mouse cells. We had speculated that this difference may have been due to the fact that it is generally harder for human than mouse cells to become cancerous. Remember that cancer cells and stem cells share many characteristics - they multiply without stopping, and they are dedifferentiated. Why would humans be less predisposed to cancer? Probably with our long life spans, we are much more prone to getting cancer and our cells have many more mechanisms to halt dedifferentiation.

Now in Yamanaka's paper we are learning that the same four genes that can turn on the dedifferentiating process in mouse cells also works in human cells ... so we are not that different after all. But I'll have to look at the Yamanaka paper to see if anything was changed in the IPS cell generation protocol.

Another point to remember -the 4 gene protocol is still very inefficient. Less than one in a few thousands (and this estimate is low) get converted.

2) It would seem like the magic 4 genes that are needed to convert somatic cells to IPS cells are not absolute. Thomson's group from the University of Wisconsin (yes, the same guy who first isolated human stem cells), used 2 genes that had been used before (Sox2 and Oct 3/4) but substituted the two oncogenes (myc and klf4) with two other genes (Nanog and lin28). Interestingly, all but one of these molecules are transcription factors, proteins used to turn on other genes. But one of the new guys, lin28, is an RNA binding protein. So it looks like some of the transformative power could lie not only in altering global transcription (DNA => RNA) but also in altering global translation (RNA => protein).

3) This is a major advance not in terms of generating stem cells, but more importantly for understanding how cells take on different fates. We've basically discovered how to kick start the program that resets the clock. This reprogramming event seems complicated - it take a couple of weeks to transform normal cells into stem cells - that's a long time. The reprogramming involves a resetting of epigenetic markers, an activation of certain genetic algorithms that help reprogram the cells, and a turning off of other genetic programs that repress dedifferentitation and cancer. It is a big deal for those who want to understand how cell fate is specified - one of the biggest mysteries in science. But all the talk in the media is on how now we can hope to make stem cells for clinical treatments. That day is far away - the major advance here is in our knowledge of biological systems and of (what I like to call) "self-understanding". Yes we have a further clue into what makes a human body tick and that is cool in of itself.

4) The implications. One of the biggest implications of this research is this: the whole idea that a "soul" is created upon conception is not a tenable view anymore. Lets look at the facts - you can take any skin cell, turn on four genes and *presto* you get a cell that can potentially make a new organism, with its own brain, its own mind and its own "soul". Conception is not required to make a soul. This new person will be one of us and even if he or she has teratomas, he/she will feel, love, hate, cry and laugh just like any other member of our species. It is probable that one day the cells that we created by the activation of four genes will be indistinguishable from the cells from a blastocyst. So how can religious conservatives champion one line of research and not another? How can religious conservatives think that one clump of cells have a soul and the other doesn't? It just doesn't add up.

Let me rephrase this ... If we can create IPS cells then it means that a "soul" can be created without conception.


Ref:
Kazutoshi Takahashi, Koji Tanabe, Mari Ohnuki, Megumi Narita, Tomoko Ichisaka, Kiichiro Tomoda, and Shinya Yamanaka
Induction of Pluripotent Stem Cells from Adult Human Fibroblasts by Defined Factors
Cell (07) advance online publication DOI:10.1016/j.cell.2007.11.019 (Yes you can get this paper without a subscription - bravo Cell!)

Junying Yu, Maxim A. Vodyanik, Kim Smuga-Otto, Jessica Antosiewicz-Bourget, Jennifer L Frane, Shulan Tian, Jeff Nie, Gudrun A. Jonsdottir, Victor Ruotti, Ron Stewart, Igor I. Slukvin, James A. Thomson
Induced Pluripotent Stem Cell Lines Derived from Human Somatic Cells
Science (07) advance online publication DOI: 10.1126/science.1151526
 

ThaG

Sicc OG
Jun 30, 2005
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#13
that's what I was talking about

http://scienceblogs.com/scientificactivist/2007/11/embryonic_stem_cell_debate.php

Embryonic Stem Cell Debate Over; Thousands of Researchers Now Jobless

That could easily have been the shared title of a pair of articles in today's New York Times discussing the science and political implications of two very significant stem cell papers published online yesterday. The biggest offender was Sheryl Stolberg:

It has been more than six years since President Bush, in the first major televised address of his presidency, drew a stark moral line against the destruction of human embryos in medical research.

Since then, he has steadfastly maintained that scientists would come up with an alternative method of developing embryonic stem cells, one that did not involve killing embryos.

Critics were skeptical. But now that scientists in Japan and Wisconsin have apparently achieved what Mr. Bush envisioned, the White House is saying, "I told you so."

Conservative Republican presidential hopefuls like former Gov. Mitt Romney of Massachusetts are breathing a sigh of relief. And opponents of embryonic stem cell research are congratulating themselves.

I think I just threw up a little bit.

Oh no... there's more!

On Tuesday, senior aides to Mr. Bush said he drove the experiments by holding his moral ground.

"This is very much in accord with the president's vision from the get-go," said Karl Zinsmeister, a domestic policy adviser to Mr. Bush who kept the president apprised of the work. "I don't think there's any doubt that the president's drawing of lines on cloning and embryo use was a positive factor in making this come to fruition."

OK, OK, that last part wasn't Stolberg's fault: it was just the Bush Administration being completely fucking insane! Yes, that's right: by doing everything in his power to prevent embryonic stem cell research from happening, George Bush is now inexplicably its savior. The Administration is able to claim this with a straight face despite the fact that (1) this isn't the end of the embryonic stem cell debate (see below) and (2) one of the two studies reported yesterday (and the original work that directly led to these breakthroughs) comes from Japan! Maybe what the Administration means is that by inhibiting embryonic stem cell research in the US to such a large degree, it all but ensured that this major breakthrough would come from overseas.

Getting back to the media coverage, I should note that although Stolberg has a tendency to write these disappointingly credulous articles, I have to admit that I reproduced only the worst parts here. Surprisingly, though, Gina Kolata's article in the Times wasn't much better. This is a shame, because the two papers published today are quite significant and very interesting.

I won't go too much into detail about the science, since there already some good explanations in the blogosphere (Pharyngula, Denialism Blog, The Daily Transcript, Hope for Pandora) and in Cell. One paper (Takahashi et al.) was published in Cell and came out of Shinya Yamanaka's group in Japan. The other (Yu et al.) was published in Science and came out of James Thomson's group in Wisconsin. Thomson's group was the first to isolate human embryonic stem cells in 1998, and Takahashi's and Yamanaka's work last year on mice first validated the approach published yesterday. Both groups yesterday reported infecting fibroblasts from grown humans with retroviruses containing four key genes. The expression of these four genes transforms these fibroblasts into "induced pluripotent stem (iPS) cells", which are very similar to totipotent embryonic stem cells. Like embryonic stem cells, these iPS cells can differentiate into any type of tissue and (in mice, at least) can give rise to an entire organism. Interestingly, both research teams accomplished this feat with a different set of four genes. Both used Sox2 and Oct 3/4, genes that encode transcription factors (proteins that control the expression of other genes). In addition, Takahashi et al. included two other transcription factors: Klf4 and c-Myc (c-Myc is a notorious oncogene that when mutated or overexpressed can promote cancer development). This was the combination of four genes used in their original mouse studies, and I think that many scientists were surprised that this strategy worked in humans considering some significant differences between human and mouse stem cell biology. Instead of Klf4 and c-Myc, though, Yu et al. used Nanog (a transcription factor) and Lin28 (an RNA-binding protein involved in regulating the translation of RNA into protein). While Lin28 seemed to improve the efficiency of their system, it was not necessary for the creation of iPS cells.

The latest developments are very significant, and they will have a major impact on embryonic stem cell research. And, they have already made an impact on the debate over embryonic stem cell research, although most of this has been trumped up by the media. This certainly isn't the first time that some newfangled finding has been heralded as the be-all and end-all to the stem cell debate. Here are a few reasons why those who claim the debate is over now are way out of line:

1. Although these iPS cells are very similar to embryonic stem cells, they are not identical. Takahashi et al. found that "DNA microarray analyses showed that the global gene-expression patterns are similar, but not identical, between human iPS cells and hES cells." Yu et al. reported that when injected into mice, different iPS lineages varied in how they tended to differentiate.
2. The retroviral technology used in the current studies is not appropriate for clinical applications. Scientists cannot control where the retrovirus integrates into the host cell's DNA, so it can potentially disrupt important genes, leading to complications down the line (cancer being the most likely). Also, Yamanaka reported earlier this year that 20% of the offspring of iPS-generated mice developed tumors at a young age, although this was attributed to c-Myc (one of the four genes used in creating iPS cells) being reactivated. The protocol of Takahashi et al., at least, avoids this particular downfall by not using c-Myc.
3. This is the big one: iPS cells appear to be totipotent. That means they are fully capable of forming embryos themselves (this has been demonstrated in mice). If these cells are no different from human embryonic stem cells in that respect, I'm not really sure what ethical issues are being addressed here.

In short, these findings in no way validate Bush's current ban on federal funding for human embryonic stem cell research (in fact, they happened in spite of the ban, since this work would not have been possible without prior and ongoing research on human embryonic stem cells). But, these findings are very cool and very significant. Although the press coverage has focused on clinical applications, these latest advances will be most valuable for basic research, allowing scientists to generate stem cells from patients with a variety of diseases to better understand the basic pathology. And, this will give scientists another effective tool for studying human development. This will surely lead to clinical breakthroughs down the line, and although the technology in its current form is not appropriate for therapeutic uses, after some tweaking it might be. But, not yet.
 

ThaG

Sicc OG
Jun 30, 2005
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#14
More of that:

http://article.nationalreview.com/?q=ZGVlNjZjNjFiY2Q0NWJkODhiY2E3Y2NjYjVhYjIzMGI=

Bush Bears Fruit
New discoveries pave the way for ethical stem-cell research, thanks to the president’s policies.

By Wesley J. Smith

Throughout his presidency, the Science Intelligentsia has castigated President Bush for placing limits on the federal funding of embryonic-stem-cell research (ESCR). Acting as if he had a banned ESCR, which of course he hadn’t, “the scientists” and their camp followers in the media and on Capital Hill accused the president of withholding cures from the ill in order to impose his religious beliefs on a reluctant public.

Little noted in all of the caterwauling, was that ESCR and human-cloning research (SCNT) have been funded bounteously — to the tune of nearly $2 billion. Not only has the National Institutes of Health put more than $150 million in recent years into human ESCR (about $40 annually), but according to a recent report put out by the Rockefeller Institute, to date about $1.7 billion has poured into ESCR and SCNT from philanthropic sources — and this doesn’t include the hundreds of millions granted annually by the states for cloning and ESCR experiments.

So what’s really going on here? Yes, the president’s policies have forced some research centers to set up separate labs for research on Bush-approved- and non-approved, stem-cell-research lines. But what really got under “the scientists” skin was the clarion moral message sent by the president: It is wrong to treat nascent human life as a mere natural resource to be sown, reaped, and consumed.

Big Biotech responded to the Bush policy by mounting a powerful public advocacy campaign aimed at both opening the federal spigots, and breaking the back of the moral opposition to ESCR and human cloning research. Railing against the president and supporters of his policy as “anti-science,” ESCR/SCNT advocates accused Bush of denying sick people needed medical breakthroughs. Human cloning via SCNT was redefined from “therapeutic cloning” in the advocates’ lexicon to merely “stem-cell research.” The change of term constituted a clever ruse that bundled and confused in people’s minds, the morally acceptable advances being made in adult stem-cell research, the morally dubious human cloning project, and the use of “spare” embryos for research that were “going to be discarded anyway.”

For awhile, the political tide ran powerfully in the cloners’ direction. In November 2004, California voters passed Proposition 71, agreeing to borrow $3 billion over ten years to pay private companies, and their business partners in major university research centers, to conduct human cloning research and ESCR. This was followed with bipartisan votes in Congress passing legislation to overturn Bush’s policy. To this, the president responded with his only veto of the first term. This year, with the Democrats in control of both houses of Congress, that bit of Kabuki Theater was repeated — but the President’s policy held.

Then, almost without being perceived, the tide began to turn. Amendment 2 in Missouri — which established a constitutional right in Missouri to conduct human cloning research — was expected to cruise to an easy victory, proving that even in the Bible Belt, people wanted scientists to pursue ESCR/SCNT. But in the last two weeks of the campaign, public support for the measure plummeted in the face of the sheer power of Rush Limbaugh’s broadcasting voice in the imbroglio over actor Michael J. Fox’s pro ESCR/cloning political ads, and an effective last minute advertising campaign featuring St. Louis Cardinal baseball stars and popular actors which warned voters “don’t be bought, don’t be fooled.” The measure limped home with a bare majority, winning the day politically, but denying its sponsors of the big moral boost they expected to receive from its passage.

Meanwhile, little reported by the mainstream media, adult stem-cell/umbilical-cord blood stem-cell research advanced at an exhilarating pace. Early human trials showed that adult stem cells from olfactory tissues restored feeling to patients paralyzed with spinal-cord injury. Bone-marrow stem cells appeared to prevent the worsening of progressive MS. People with Type-1 diabetes were cured with their own adult stem cells. Increasingly, Big Biotech’s circus barker-call of CURES! CURES! CURES! seemed to be wearing thin. Then, just a few weeks ago, New Jersey voters shocked the science and political worlds by rejecting a $450 million bond measure that, like California’s Proposition 71, would have funded human cloning and embryonic-stem-cell research.

Returning to President Bush’s stem-cell funding policy; even though it was politically unpopular, the President believed wholeheartedly that the raw talent, intelligence, and creativity of the science sector would find a way to obtain pluripotent stem cells (the ability to become any cell type) through ethical means. In speeches and news conference answers about the stem-cell issue, Bush repeatedly supported existing ethical areas of research, and called upon researchers to find “alternative” methods of developing stem-cell medicine without treating nascent human life “as an experiment.” Toward this end, earlier this year Bush signed an executive order requiring the NIH to identify all sources of human pluripotent stem cells, and invited “scientists to work with the NIH, so we can add new ethically derived stem-cell lines to the list of those eligible for federal funding.”

The Science Establishment pouted and the New York Times castigated the president’s call. But other scientists had already taken up the president’s challenge, and their work was paying off. Experiments in mice by Rudolf Jaenisch at Harvard demonstrated proof of principle for “altered nuclear transfer” (ANT), a theoretical method of deriving pluripotent stem cells without creating and destroying embryos. Don Landry, Professor at Columbia University Department of Medicine, developed a way to identify dead embryos for potential use in stem-cell research — which would be no more unethical than researching on cadavers. Perhaps most excitingly, Kyoto University’s Shinya Yamanaka reprogrammed skin cells from the tails of mice, and reverted them back to an embryonic-like stem-cell state — offering tremendous hope that every therapeutic benefit scientists believed could be derived from therapeutic cloning, could instead be achieved by regressing a patient’s own tissues.

Then, last week very big news: Ian Wilmut — who opened the Pandora’s Box of human cloning with the creation of Dolly the sheep, and who two years ago obtained a license from the United Kingdom’s Human Fertilization and Embryology Authority to create cloned human embryos from the cells of Lou Gehrig’s disease patients — stunned the scientific world with the sudden and unexpected announcement that he had rejected human cloning research, in favor of pursuing cell reprogramming as an ethical and uncontroversial means of obtaining pluripotent cells. Wilmut told the Telegraph:

The odds are that by the time we make nuclear transfer work in humans, direct reprogramming will work too.

I am anticipating that before too long we will be able to use the Yamanaka approach to achieve the same, without making human embryos. I have no doubt that in the long term, direct reprogramming will be more productive, though we can't be sure exactly when, next year or five years into the future.

Finally, today came the Krakatau of stem-cell announcements: Reprogramming has been achieved using human cells. As reported by the journal Science, researchers reverted human connective tissue cells back to an embryonic-stem-cell-like state — and then differentiated them into all three of the body’s major tissue types. If this work pans out, there will be no need to create human cloned embryos for use in embryonic-stem-cell therapies.

I believe that many of these exciting “alternative” methods would not have been achieved but for President Bush’s stalwart stand promoting ethical stem-cell research. Indeed, had the president followed the crowd instead of leading it, most research efforts would have been devoted to trying to perfect ESCR and human-cloning research — which, despite copious funding, have not worked out yet as scientists originally hoped.

So thank you for your courageous leadership, Mr. President. Because of your willingness to absorb the brickbats of the Science Establishment, the Media Elite, and weak-kneed Republican and Democratic politicians alike — we now have the very real potential of developing thriving and robust stem-cell medicine and scientific research sectors that will bridge, rather than exacerbate, our moral differences over the importance and meaning of human life.

they are trying to make it look as if Bush was the driving force these discoveries...