Healthy babies born in UK using DNA from 3 people to prevent hereditary diseases
It's an innovation made possible by a 2016 change in British law. Though banned in the United States and many other countries, the technique is also permitted in Australia.
The news 'marks an important milestone,' said Dr. Zev Williams, who directs the Columbia University Fertility Centre but was not involved in the work.
'Expanding the range of reproductive options will empower more couples to pursue safe and healthy pregnancies'.
Related
Patients with mysterious rare diseases get a second chance at diagnosis with data-sharing project
First IVF baby born in the UK with DNA from three parents in major trial to avoid defective genes
Why mitochondrial diseases are so dangerous
Most of our DNA comes from the nucleus of a cell, inherited from both mother and father. But there's also some DNA outside of the cell's nucleus, in structures called mitochondria - tiny energy-producing structures that come only from the mother.
When mitochondrial DNA carries dangerous mutations, it can lead to severe and often untreatable conditions in children, from seizures and muscle weakness to organ failure and early death.
Screening embryos during IVF can sometimes detect these mutations - but not always. As a result of these rare and uncertain cases, scientists have been developing a pioneering workaround: replacing the mutated mitochondria with healthy ones from a donor egg.
The mother's genetic material is extracted and inserted into a donor egg that has had its own nucleus removed, keeping the donor's mitochondria intact but none of her traits. The resulting embryo contains DNA from three people: the mother, the father, and a third-party mitochondrial donor.
Outcomes and early results from the UK study
Researchers from Newcastle University in the UK and Monash University in Australia, writing in the New England Journal of Medicine, reported that they applied the technique to embryos from 22 women. Eight healthy babies have been born so far, and one woman remains pregnant.
One of the babies showed slightly elevated levels of abnormal mitochondria - but not high enough to cause disease, experts say. Still, doctors will continue to monitor development.
Dr. Andy Greenfield, a reproductive health expert at the University of Oxford, called the work 'a triumph of scientific innovation,' and said the method of exchanging mitochondria would only be used for a small number of women for whom other ways of avoiding passing on genetic diseases, like testing embryos at an early stage, was not effective.
While the term 'three-parent baby' makes headlines, the amount of donor DNA involved is tiny - less than 1 per cent of the child's genome.
"If you had a bone marrow transplant from a donor... you will have much more DNA from another person,' noted stem cell expert Robin Lovell-Badge.
So far, 35 families in the UK have been approved to use the technique, which is closely regulated.
Critics have voiced concerns over the long-term effects of heritable genetic changes, which is partly why the US currently prohibits clinical research into such methods. Federal restrictions have blocked the FDA from even considering applications involving embryos altered in this way
But for families like Liz Curtis', the technique offers something they never had before: hope. Her daughter Lily died of a mitochondrial disease in 2006 at just eight months old.
She said the diagnosis 'turned our world upside down, and yet nobody could tell us very much about it, what it was or how it was going to affect Lily.'
Curtis later founded the Lily Foundation in her daughter's name to raise awareness and support research into the disease, including the latest work done at Newcastle University.
'It's super exciting for families that don't have much hope in their lives,' Curtis said.
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'No one wants to be on strike but what I do want is to not be paid less than doctors were in 2008'
Outside Manchester Royal Infirmary a few dozen doctors in orange baseball caps and tabards are waving placards as passing drivers beep their horns in support. 'Overworked, underpaid, undervalued,' reads one hand-drawn sign. 'Pay restoration for doctors,' demand several others A five-day walkout by resident doctors in England got under way today, with members of the British Medical Association manning picket lines across the country. The BMA has argued that real-terms pay has fallen by around 20% since 2008, and is pushing for full 'pay restoration'. READ MORE: LIVE M6 and M56 traffic updates as crashes cause severe delays on both motorways as holiday getaway begins READ MORE: Family of teenager killed in alleged e-bike crash murder call for 'peace' as they issue tribute The union took out national newspaper adverts on Friday, saying it wanted to 'make clear that while a newly qualified doctor's assistant is taking home over £24 per hour, a newly qualified doctor with years of medical school experience is on just £18.62 per hour'. Never miss a story with the MEN's daily Catch Up newsletter - get it in your inbox by signing up here Ross Nieuwoudt, co-chair of the BMA resident doctors committee, was among those manning the MRI picket line today. The 29-year-old, who has been a resident doctor for going on five years, said: "Morale among doctors is mixed. If we didn't have hope that there could be change, we wouldn't be here on strike at all, we would be voting with our feet and leaving the country. "The truth is many doctors are leaving. 7,000 to 9,000 applied to leave the country last year - many have left and the majority of those don't return. Unless something is done about pay and conditions, that is going to continue happening. "There has been a huge amount of support coming by, people coming by to say they support us, reports of patients coming out of hospital to picket lines today to show support. I think support is there but I also fully sympathise with the patients that are worried or concerned or don't support. "No one wants to be on strike - I don't want to - but what I do want is to feel valued and respected and not paid less than doctors were in 2008. All we need is for [Health and Social Care Secretary] Wes Streeting to come to us with a credible offer and a credible next step to restore our pay. Then it can stop right now - that's all we're asking for." Join the Manchester Evening News WhatsApp group HERE Mr Streeting said: "This government is doing all it can over this strike period to minimise patient harm and disruption. Working with NHS leaders, we've put in measures to keep as much urgent and planned care available and safe as we possibly can. "The truth is that patients and NHS staff did not need to be in this position today. Despite a 28.9% pay rise for their members over the last three years, and constructive talks on range of measures to improve the working lives of resident doctors, the BMA leadership chose to walk away from talks and lay the damage at the NHS's door. "There is no getting around the fact that these strikes will hit the progress we are making in turning the NHS around. But I am determined to keep disruption to patients at a minimum and continue with the recovery we have begun delivering in the last 12 months after a decade and a half of neglect. We will not be knocked off course."
Medscape
2 hours ago
- Medscape
Jul 25 2025 This Week in Cardiology
Please note that the text below is not a full transcript and has not been copyedited. For more insight and commentary on these stories, subscribe to the This Week in Cardiology podcast , download the Medscape app or subscribe on Apple Podcasts, Spotify, or your preferred podcast provider. This podcast is intended for healthcare professionals only. In This Week's Podcast For the week ending July 25, 2025, John Mandrola, MD, comments on the following topics: The group at the University of Leeds in the UK have published an interesting paper on endurance athletes, cardiac fibrosis, and ventricular arrhythmia. They cheekily named it Ventoux to correspond to a recent Tour de France stage finishing on Mount Ventoux. I've climbed Ventoux. It took me 1 hour 42 minutes. Tadej and Jonas did it this week in 54 minutes—a record by a minute. Imagine liking, no, loving, the notion of climbing a 10% gradient for well more than hour and you will understand the mindset of older endurance athletes. Thinking this is fun is a sort of disease. People who do this day in and day out for decades have an affliction. I know because I do. We are like rodents who, given a wheel in our cage, will run on it, for no purpose other than to run on it. Before I say anything else, I want to start with the fact that exercise is one of the pillars of health. It's in every expert consensus document and oodles of observational studies correlate exercise with longevity. But 60-year-old people who cycle or run more than 10 hours per week for decades are not normal exercisers. For instance, if you do an hour ride 5 days per week, to get to that level of exercise, you have to do a 5-hour ride on the weekend or two 3-hour rides on Saturday and Sunday. That's a lot. I co-wrote a book called The Haywire Heart in which my chapters were basically narrative reviews of the cardiac effects of all this exercise. The one, single observation that got me interested in this topic is that endurance athletes have a heightened relative risk of getting atrial fibrillation (AF) and, electrically and structurally, their atria remodeling resembles that of a person of obesity and hypertension. Isn't that wild? But AF is not the topic of this paper. Endurance athletes can also develop both myocardial fibrosis (scar) and ventricular arrhythmias (VA). The VA story is less fleshed out than the AF story, perhaps because it is less common. But again, you have the paradox: endurance exercise correlates with scar seen in healed myocarditis and other cardiomyopathies. Something amazing for health — regular exercise — perhaps can be detrimental in huge doses. And we all know that myocardial scar can predispose to ventricular arrhythmias—which, can in rare cases, lead to sudden cardiac death. Now to the Ventoux study: The Leeds group recruited about 100 endurance athletes and 27 controls with the purpose of studying MRI, CMR, and monitoring for VA with implantable loop recorders (ILRs) over 2 years. All participants had to agree to an ILR implant, which is likely an important factor in the study's interpretation. This study is a great effort. I congratulate the authors. The average age was about 60. All were men. None could have any symptoms or heart disease. The athletes were pretty strong. The functional threshold power, what can be held for an hour, was around 244 watts. That's not close to elite but it's not Mickey Mouse either. Another factor was that the Leeds group is a well-known and experienced in imaging. So, the MRI imaging can be trusted, and an expert in imaging told me these are likely real findings. And here are the topline results: Nearly half (47%) had myocardial fibrosis on MRI, the vast majority had inferior lateral location of scar. The main way the authors display the results is with two groups—those with scar and those without scar. About 1in 5 athletes overall had some ventricular arrythmia on the ILR during 2 years of follow-up Those with fibrosis had a 4.7% higher relative risk of VA. (But crucially, the 95% CI were wide from 80% higher risk to 13x higher). Athletes with fibrosis were slightly older than athletes without fibrosis (62 years versus 57 years) Athletes with fibrosis exhibited a greater prevalence of premature ventricular contractions (PVC) during exercise testing than athletes without fibrosis (71% vs 42%; P =.003) All three of the athletes with VT longer than 30 seconds, which we call sustained VT, had fibrosis on cardiac MRI. And all 3 who experienced sustained VT were symptomatic and developed an episode of nonsustained VT before the onset of VT. One athlete received an ICD due to presyncope, one was scheduled for an EP study (the results of which were not known), and the third was advised to cease competing due to recurrent VT during exercise but declined further investigation Of those who experienced a ventricular arrhythmia, 78% of the athletes had myocardial fibrosis on CMR compared with 22% athletes who did not ( P < .001). Two other predictors of having VT were left ventricular (LV) dilation and exercise-induced PVCs. Late gadolinium enhancement (LGE) at the right ventricular (RV) insertion point was super common. This is also well known in athletes but it had no statistically significant correlation with VA. But confidence intervals (CI) were wide again. Both groups had normal left ventricular ejection fraction (LVEF). Both had similar and normal RV function. There were no significant differences in T2 times between athletes with and without ventricular arrhythmia. No athlete had T2 values indicative of acute myocardial edema, and no athlete fulfilled Lake Louise Criteria for acute myocarditis. The authors concluded that fibrosis incidence was high and associated with VA, and RV insertion point LGE was not associated with VA and…sit down for this conclusion: 'Further studies are needed to establish whether myocardial fibrosis itself is arrhythmogenic or in the case of athlete's indicative of a myopathic process.' I like this conclusion, and it's different from many of the posts I have seen on social media—which go too far in scaring people about exercise. There is much to say about these observations, but, sadly, most are questions rather than answers. First: Why was the fibrosis presence so high? Almost half of people. I think the issue here is a systemic bias in this study: it's a selection bias. Or more specifically , self-selection . A researcher who does a lot of normal volunteer studies told me that, after the fact, many asymptomatic volunteers admit to symptoms they wanted checked. Now…Recall this study was done in the UK, where getting checked out may not be so easy. So you enroll 100 people who have to agree to get ILRs. To me this is a special population, who are probably more than just curious; they are probably concerned. Endurance athletes tend to be obsessive and read a lot about the heart issues in athletes. I would almost consider getting an ILR a collider bias. You are not looking at a general population of endurance exercisers but rather those endurance exercisers interested in monitoring for some reason. Second issue: There is the issue of ILR monitoring . These things are always on. They, like pacemakers, pick up everything . They are far more sensitive than a 2-week ECG or even an Apple Watch. So you have a population enhanced by concern wearing a monitor that misses nothing. In my device clinic, I probably get three nonsustained VT alerts per day — 99% of which I say, just follow. I've become increasingly convinced that short episodes of atrial and ventricular tachycardia are probably normal in older adults. Indeed, in VENTOUX, only 3 of the 100 individuals had symptoms that required clinical action—an ICD, an EP study, results unknown, and an exercise restriction. All three were symptomatic, so clinically, I agree 100% with the authors, that there is nothing in this data that would suggest screening with MRIs and ILRs. Let me repeat: VENTOUX does not support screening athletes with MRI. You can and should wait for symptoms. The third matter is the degree of LGE. The scar burden was only 2%. These are tiny scars, and most serious VT we take care of in EP comes from much larger scars. But while it is true that any scar is abnormal, we don't know if it is from exercise or healed myocarditis. And we don't know the benefit/harm ratio of lifelong exercise. Lifelong exercise is protective against diabetes, hypertension, coronary artery disease (CAD), but it may cause small LGEs in a very small proportions of patients. Notice that all these are comments are questions. This study is interesting. Intensely interesting. It's a great effort, but to offer more actionable results, beyond, don't ignore symptoms , which is an easy thing to tell people, we would need larger samples that were crucially more random in sampling. Though they tried, VENTOUX is not all a random sampling of heavy exercisers. Imagine a study wherein you went to an endurance race, and you signed up one out of every five 30-year-olds and followed them serially, as they did in Framingham, with CMR every 5 years for two or three decades. Then we might know more. But such a study is vast and super expensive. For now, I recommend regular exercise as if it was a heart pill or AF pill. You take it daily. Todos los dias. The vast majority of people I see don't exercise enough. What bike racers like to do is not at all for health . It is for fun, or for sanity; whether it is a net harm remains to be seen. But even if it were, I am not sure most of us would stop doing it. Because rodents must run on the wheel. An Australian group of researchers have published a massive systematic review and meta-analysis of daily steps in and health. Lancet Public Health published the study, which was covered in 176 news outlets as of this morning. Most of the news stories say something like the 10,000-step myth has been busted and 7000 is sufficient. The news' stories are wrong. And I will briefly cover this study because it bookends the extreme exercise study quite well. The research team had 57 studies from 35 cohorts included in the systematic review and 31 studies from 24 cohorts included in meta-analyses. They looked at dose response (in steps) and many outcomes including all-cause mortality, cardiovascular disease incidence, dementia, falls, and type 2 diabetes. The comparator or control group was 2000 steps. Compared to that those who reported or documented with counter 7000 steps per day had a: 47% reduction in all-cause death (HR 0.53 [95% CI, 0.46–0.60]; I 2 =36.3; 14 studies) 25% reduction in CV disease incidence (HR 0·75 [0·67–0·85]; I 2 =38·3%; 6 studies) 47% reduction in CV mortality (HR 0·53 [0·37–0·77]; I 2 =78·2%; 3 studies) 37% reduction in cancer mortality (HR 0·63 [0·55–0·72]; I 2 =64·5%; 3 studies) 14% reduction type 2 diabetes (HR 0·86 [0·74–0·99]; I 2 =48·5%; 4 studies) 38% reduction in dementia (HR 0·62 [0·53–0·73]; I 2 =0%; 2 studies) 28% reduction in falls (HR 0·72 [0·65–0·81]; I 2=47·5%; four studies) My issue with this study is that when you go to the main figure, the plots with hazard ratio (HR) on the y-axis and step counts on the x-axis, you see a clear dose response of steps and specific outcomes. 2000 steps is where the HR is 0. If it's less than 2000 steps, the outcomes are actually higher, but as the step count increases the HR drops. The authors pick 7000, I assume because that is where the slope of benefit seems to plateau, but when you look at the curves, the HR keeps dropping with more steps. The authors quantify the added benefit of > 7000 steps per day in Table 8 of the supplement. For all-cause death, there is an added 10% lower HR with 10,000 vs 7000. Same for cancer mortality and depressive symptoms—an added 10% lower relative risk. So I don't think any myths were busted. 7000 is fine. 7000 steps per day is associated with lower bad health outcomes. But for many, including all-cause death, 10,000 is better. The added benefits reached statistical significance. So if a patient asks, the number is still 10,000. Though 7000 is also good. And 5000 is better than 4000, which is better than 3000. After reviewing this study, the thought about European vs American life popped into my head. We have probably 2000 people working at my hospital. Less than 5 of them walk to work; less than 10 of them ride their bike. When I visited the team at Basel, Switzerland last fall, it looked like more than 75% walked or cycled to work. Very few American cities are set up for walking. That's sad. So Americans have to make an effort to be active. I think it's worth it. And I recommend it in the clinic. For my height, 7000 steps is about 3 miles. 10,000 steps is nearly 5 miles. The optimal dose is the longer one. But some is better than none. Everyone Deserves a Shot at the American Dream: Sinus Rhythm Let me say a few words here about rate vs rhythm control, because this may actually be the number one issue in all of electrophysiology. The stimulus for writing such a review piece I think comes from the PRAGUE 25 trial of lifestyle modification vs AF ablation. I have opined on that in my July 11 podcast. In sum, AF ablation led to less AF than risk factor (RF) modification alone, though 35% (or 1 in 3 patients) in the risk factor modification group had sinus rhythm (SR) without ablation. And RF modification led to more weight loss, better glycemic control, and better fitness as measured by VO 2 max. PRAGUE 25 also found no statistical differences in AF burden nor quality of life measures. The sits in the literature as a 'positive' ablation trial, but I actually think, healthwise, it is a 'positive' trial for RF modification. The Medscape article cites a 'hybrid' approach wherein all patients who pursue rhythm control also get risk factor modification, which I totally agree with, and I have to say, is underused, at least in my zip code. The absolute wrong thing to do is ablate the AF and not help the patient lose weight and improve cardiometabolic health. Because if you do this, you have merely reduced a surrogate marker — AF episodes. Health is not improved if obesity, hypertension, diabetes, and poor exercise tolerance remain. You succeed as a proceduralist but fail as a doctor in this scenario. The Medscape article goes on to celebrate the benefits of SR over AF. The next logical step is to laud rhythm control over rate control. And here I have a problem. And I somewhat disagree with friend and colleague Eric Prystowsky, MD. Eric is well known for his criticism of AFFIRM and how that trial set EP back years. But I had the pleasure of speaking in Calgary and met the late Dr. George Wyse, the principal investigator of AFFIRM. AFFIRM is one of those landmark trials that deserves your attention. Published in 2002, a total of 4060 patients with AF were randomized to rate or rhythm control. Mortality was the primary endpoint. Patients in AFFIRM were like those we see every day. 70 years old. Most with hypertension, a third with CAD. At 5 years, 23.8% in the rhythm control arm died vs 21.3% in the rate control arm. The HR was 1.15, or 15% worse for rhythm control. CIs were 0.99-1.34 so the P value for arm was just outside 0.05 but the upper bound or worse case was a 34% higher rate of death in the rhythm control arm. More patients in the rhythm-control group than in the rate-control group were hospitalized, and there were more adverse drug effects in the rhythm-control group as well. AFFIRM was largely interpreted as showing no differences in the two strategies. But, really, there was a strong trend for worse outcomes in the rhythm-control arm. One of the major changes in knowledge that came from AFFIRM is the importance of maintaining oral anticoagulation (AC). In AFFIRM, patients in the rhythm control arm who were maintaining SR could stop their oral AC. This led to a difference in AC use 85% vs 70% rate vs rhythm control. In fact, AFFIRM largely changed the view that patients with AF with either strategy should remain on oral AC. The Sherman et al substudy in JAMA Internal Medicine found that patients who remained on warfarin were 68% less likely to have stroke. A large proportion of ischemic strokes (113 of 157) occurred in patients in whom anticoagulation had been stopped (on the basis of re-established normal sinus rhythm) and who had a subtherapeutic international normalized ratio. Eric's point about AFFIRM is it led to too many patients with AF being told that there was no reason to try to get into SR, and if you don't try, and you leave patients in AF, it becomes impossible to restore SR after a year or so. The other problems (or criticisms) of AFFIRM were that patients had to be able to tolerate rate-control. So highly symptomatic patients were excluded. AFFIRM should never have been applied to these patients. Many of these symptomatic patients were younger, and it is a serious error to just leave a symptomatic younger person with AF forever in AF. Another criticism of AFFIRM was that it only included antiarrhythmic drugs (AAD), and amiodarone was the most common one used. AAD were all that was available at the time. We now know that AF ablation is far more effective at rhythm control than drugs. So there is a like a bridge to SR early on, and many patients can be put into SR with rhythm control. Proponents of aggressive rhythm control also cite the EAST-AF trial, a rhythm vs rate control trial, which strongly favored rhythm control. But EAST-AF suffered from serious performance bias issues wherein the rhythm control arm got oodles more interactions with the health system. Here is my take of the decision: AFFIRM still applies. If you have an older person with minimal to no symptoms from AF, rate control is not only fine but maybe preferred. But if there are a) symptoms, and b) clues that rhythm control is possible (e.g., the LA size is not ginormous, or the patient can cooperate, and maybe the AF is not more than 2 years persistent), I try rhythm control. But I tell patients that while there is benefit from SR (in terms of quality of life) rhythm control is hard. It costs a lot, not only in money, but investment in their time and effort. Patients have to know that RF modification is crucial, they will also have to spend a few days in the hospital (for cardioversions, maybe drug initiation or ablation). Remember, when you are getting cardioversions and AAD and ablations you are not at work or on a bike. You are being a patient. It's fine. It's an investment but patients need to know that rhythm control is unlike a gallbladder operation or an appendectomy. Rhythm control is a process that requires a friendship with a cardiologist. It's not one and done. There are also risks to rhythm control. Drug side effects and ablation complications do occur. My friends, be careful flying close to the sun with rhythm control. One of the biggest mistakes I see in general cardiology is leaping to cardioversion without a plan. CV of AF is fine, but you have to have a plan for what will happen in a week or month when the patient is back in AF. CV doesn't modify the problem of AF. It just resets the heart. In the end: EP is here to help. Get us involved. Especially when there are symptoms. And doubly especially, when there is heart failure. But don't dismiss AFFIRM. It is important trial that shows that rate control is not a terrible strategy in selected patients. GLP-1 RAs Protective Against Stroke, Neurodegeneration? A GLP-1 study purports to show benefit in cerebrovascular health. It actually shows how observational studies can mislead you. The title of the study is, 'Neurodegeneration and Stroke After Semaglutide and Tirzepatide in Patients With Diabetes and Obesity.' It was published in JAMA Network Open . The goal of the Taiwan group was to evaluate the association of semaglutide and tirzepatide with the incidence of dementia, Parkinson disease, ischemic stroke, intracerebral hemorrhage, and all-cause mortality compared with other antidiabetic drugs in adults with type 2 diabetes and obesity. It's an important question. The best way would be to randomize, but that would be hard and costly. So this was a retrospective cohort study using electronic health records from the TriNetX US network, 2017-2024. The two groups in this study were those on GLP-1, either semaglutide or tirzepatide, vs those on any other diabetic medicines, such as metformin, sulfonylureas, DPP4, SGLT2 inhibitors, and others. This was a large study. About 30,000 in each of the two groups. The groups are not randomized. A doctor chose which of the two groups of drugs to use. So, since it's not randomized the authors did propensity matching. Age 57. Half female. BMI on average 40, and 70 % with hypertension. Here were the main results: During a 7-year follow-up, GLP-1 RA users had a lower risk of dementia (HR, 0.63; 95% CI, 0.50-0.81) lower risk of stroke (HR, 0.81; 95% CI, 0.70-0.93) lower all-cause mortality (HR, 0.70; 95% CI, 0.63-0.78) and had no significant differences in the risk of Parkinson disease or intracerebral hemorrhage. The authors concluded: 'These findings suggest potential neuroprotective and cerebrovascular benefits of GLP-1 receptor agonists beyond glycemic control, warranting further trials to confirm these outcomes.' Maybe these drugs are beneficial for cerebrovascular health, especially in young people (age 57 and diabetes and BMI of 40) But this is a hopelessly confounded study where healthier patients got the more pricey and newer drug. How do I know that? There are two clues. First, is that the Kaplan-Meier curve diverges immediately and continues in parallel. That's what you expect when healthier patients get one treatment. Immediately better outcomes. If the GLP-1 was better than other drugs, you'd see gradually increasing benefit. Second reason: the mortality benefit is huge. A 30% reduction in death. In the SELECT trial of semaglutide vs placebo in patients with heart disease and obesity, semaglutide only reduced CV mortality by 15%. In the SUSTAIN-6 trial of semaglutide vs placebo, semaglutide had no sig reduction in death or CV death and required a composite endpoint to drive positive results. My overall take, therefore, is that GLP-1 drugs induce weight loss. They do modify disease in patients with obesity and diabetes and patients with obesity and atherosclerotic disease. But whether they reduce important cerebrovascular outcomes like dementia cannot be answered by these confounded observational studies. I am not sure it's worth doing these studies because the only value is to show readers the signs of bias in non-random, retrospective comparison studies.
Yahoo
2 hours ago
- Yahoo
A science journal pulled a controversial study about a bizarre life form against the authors' wishes
NEW YORK (AP) — A microscopic discovery in a California lake sparked buzz and controversy more than a decade ago when it was first revealed. Scientists said they'd discovered bacteria that used the element arsenic — poisonous to life as we know it — to grow. If true, it expanded the possibilities for where life could exist on Earth — or on other worlds. Several research groups failed to replicate the results, and argue it's not possible for a living thing to use something so toxic to make DNA and proteins. Some scientists have suggested the results of the original experiments may have been skewed by undetected contaminants. On Thursday, the journal Science, which first published the research, retracted it, though not because of misconduct on the researchers' part. 'If the editors determine that a paper's reported experiments do not support its key conclusions, even if no fraud or manipulation occurred, a retraction is considered appropriate,' the journal's editor-in-chief Holden Thorp wrote in the statement announcing the retraction. The researchers disagree with the journal's decision and stand by their data. It's reasonable to pull a paper for major errors or suspected misconduct — but debates and disagreements over the findings are part of the scientific process, said study co-author Ariel Anbar of Arizona State University. 'One doesn't retract a paper because the interpretation is controversial, or even because most disagree with the interpretation,' wrote Anbar in an email. 'At least, that hasn't been the case until now.' Science has more frequently retracted papers for reasons beside fraud in recent years, said Thorp and Vada Vinson, Science's executive editor, wrote in a blog post. NASA helped fund the original work. The space agency's science mission chief Nicky Fox said in a statement that NASA does not support the retraction and encourages Science to reconsider. —- The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute's Department of Science Education and the Robert Wood Johnson Foundation. The AP is solely responsible for all content. Solve the daily Crossword
