How Genetic Engineering Could Save the Coral Reefs
Coral reefs are usually relegated to bit player status in television and movies, providing splashes of background color for "Shark Week," "Finding Nemo," and other marine-based entertainment.
In real life, the reefs are an absolutely crucial component of the ecosystem for both oceans and land, rivaling only the rain forests in their biological complexity. They provide shelter and sustenance for up to a quarter of all marine life, oxygenate the water, help protect coastlines from erosion, and support thousands of tourism jobs and businesses.
Genetic engineering could help scientists rebuild the reefs that have been lost, and turn those still alive into a souped-up version that can withstand warmer and even more acidic waters.
But the warming of the world's oceans -- exacerbated by an El Nino event that occurred between 2014 and 2016 -- has been putting the world's reefs under tremendous pressure. Their vibrant colors are being replaced by sepulchral whites and tans.
That's the result of bleaching -- a phenomenon that occurs when the warming waters impact the efficiency of the algae that live within the corals in a symbiotic relationship, providing nourishment via photosynthesis and eliminating waste products. The corals will often "shuffle" their resident algae, reacting in much the same way a landlord does with a non-performing tenant -- evicting them in the hopes of finding a better resident. But when better-performing algae does not appear, the corals become malnourished, eventually becoming deprived of their color and then their lives.
The situation is dire: Two-thirds of Australia's Great Barrier Reef have undergone a bleaching event in recent years, and it's believed up to half of that reef has died.
Moreover, hard corals are the ocean's redwood trees. They take centuries to grow, meaning it could take centuries or more to replace them.
Recent developments in genetic engineering -- and an accidental discovery by researchers at a Florida aquarium -- provide opportunities for scientists to potentially rebuild a large proportion of the reefs that have been lost, and perhaps turn those still alive into a souped-up version that can withstand warmer and even more acidic waters. But many questions have yet to be answered about both the biological impact on the world's oceans, and the ethics of reengineering the linchpin of its ecosystem.
How did we get here?
Coral bleaching was a regular event in the oceans even before they began to warm. As a result, natural selection weeds out the weaker species, says Rachel Levin, an American-born scientist who has performed much of her graduate work in Australia. But the current water warming trend is happening at a much higher rate than it ever has in nature, and neither the coral nor the algae can keep up.
"There is a big concern about giving one variant a huge fitness advantage, have it take over and impact the natural variation that is critical in changing environments."
In a widely-read paper published last year in the journal Frontiers in Microbiology, Levin and her colleagues put forth a fairly radical notion for preserving the coral reefs: Genetically modify their resident algae.
Levin says the focus on algae is a pragmatic decision. Unlike coral, they reproduce extremely rapidly. In theory, a modified version could quickly inhabit and stabilize a reef. About 70 percent of algae -- all part of the genus symbiodinium -- are host generalists. That means they will insert themselves into any species of coral.
In recent years, work on mapping the genomes of both algae and coral has been progressing rapidly. Scientists at Stanford University have recently been manipulating coral genomes using larvae manipulated with the CRISPR/Cas9 technology, although the experimentation has mostly been limited to its fluorescence.
Genetically modifying the coral reefs could seem like a straightforward proposition, but complications are on the horizon. Levin notes that as many as 20 different species of algae can reside within a single coral, so selecting the best ones to tweak may pose a challenge.
"The entire genus is made up of thousands of subspecies, all very genetically distinct variants. There is a huge genetic diversity, and there is a big concern about giving one variant a huge fitness advantage, have it take over and impact the natural variation that is critical in changing environments," Levin says.
Genetic modifications to an algae's thermal tolerance also poses the risk of what Levin calls an "off-target effect." That means a change to one part of the genome could lead to changes in other genes, such as those regulating growth, reproduction, or other elements crucial to its relationship with coral.
Phillip Cleves, a postdoctoral researcher at Stanford who has participated in the CRISPR/Cas9 work, says that future research will focus on studying the genes in coral that regulate the relationship with the algae. But he is so concerned about the ethical issues of genetically manipulating coral to adapt to a changing climate that he declined to discuss it in detail. And most coral species have not yet had their genomes fully mapped, he notes, suggesting that such work could still take years.
An Alternative: Coral Micro-fragmentation
In the meantime, there is another technique for coral preservation led by David Vaughan, senior scientist and program manager at the Mote Marine Laboratory and Aquarium in Sarasota, Florida.
Vaughan's research team has been experimenting in the past decade with hard coral regeneration. Their work had been slow and painstaking, since growing larvae into a coral the size of a quarter takes three years.
The micro-fragmenting process in some ways raises fewer ethical questions than genetically altering the species.
But then, one day in 2006, Vaughan accidentally broke off a tiny piece of coral in the research aquarium. That fragment grew to the size of a quarter in three months, apparently the result of the coral's ability to rapidly regenerate when injured. Further research found that breaking coral in this manner -- even to the size of a single polyp -- led to rapid growth in more than two-dozen species.
Mote is using this process, known as micro-fragmentation, to grow large numbers of coral rapidly, often fusing them on top of larger pieces of dead coral. These coral heads are then planted in the Florida Keys, which has experienced bleaching events over 12 of the last 14 years. The process has sped up almost exponentially; Mote has planted some 36,000 pieces of coral to date, but Vaughan says it's on track to plant 35,000 more pieces this year alone. That sum represents between 20 to 30 acres of restored reef. Mote is on track to plant another 100,000 pieces next year.
This rapid reproduction technique in some ways allows Mote scientists to control for the swift changes in ocean temperature, acidification and other factors. For example, using surviving pieces of coral from areas that have undergone bleaching events means these hardier strains will propagate much faster than nature allows.
Vaughan recently visited the Yucatan Peninsula to work with Mexican researchers who are going to embark on a micro-fragmenting initiative of their own.
The micro-fragmenting process in some ways raises fewer ethical questions than genetically altering the species, although Levin notes that this could also lead to fewer varieties of corals on the ocean floor -- a potential flattening of the colorful backdrops seen in television and movies.
But Vaughan has few qualms, saying this is an ecological imperative. He suggests that micro-fragmentation could serve as a stopgap until genomic technologies further advance.
"We have to use the technology at hand," he says. "This is a lot like responding when a forest burns down. We don't ask questions. We plant trees."
Time to visit your TikTok doc? The good and bad of doctors on social media
Rakhi Patel has carved a hobby out of reviewing pizza — her favorite food — on Instagram. In a nod to her preferred topping, she calls herself thepepperoniqueen. Photos and videos show her savoring slices from scores of pizzerias. In some of them, she’s wearing scrubs — her attire as an inpatient neurology physician associate at Tufts Medical Center in Boston.
“Depending on how you dress your pizza, it can be more nutritious,” said Patel, who suggests a thin crust, sugarless tomato sauce and vegetables galore as healthier alternatives. “There are no boundaries for a health care professional to enjoy pizza.”
Beyond that, “pizza fuels my mental health and makes me happy, especially when loaded with pepperoni,” she said. “If I’m going to be a pizza connoisseur, then I also need to take care of my physical health by ensuring that I get at least three days of exercise per week and eat nutritiously when I’m not eating pizza.”
She’s among an increasing number of health care professionals, including doctors and nurses, who maintain an active persona on social media, according to bioethics researchers. They share their hobbies and interests with people inside and outside the world of medicine, helping patients and the public become acquainted with the humans behind the scrubs or white coats. Other health care experts limit their posts to medical topics, while some opt for a combination of personal and professional commentaries. Depending on the posts, ethical issues may come into play.
“Health care professionals are quite prevalent on social media,” said Mercer Gary, a postdoctoral researcher at The Hastings Center, an independent bioethics research institute in Garrison, New York. “They’ve been posting on #medTwitter for many years, mainly to communicate with one another, but, of course, anyone can see the threads. Most recently, doctors and nurses have become a presence on TikTok.”
On social media, many health care providers perceive themselves to be “humanizing” their profession by coming across as more approachable — “reminding patients that providers are people and workers, as well as repositories of medical expertise,” Gary said. As a result, she noted that patients who are often intimidated by clinicians may feel comfortable enough to overcome barriers to scheduling health care appointments. The use of TikTok in particular may help doctors and nurses connect with younger followers.
When health care providers post on social media, they must bear in mind that they have legal and ethical duties to their patients, profession and society, said Elizabeth Levy, founder and director of Physicians for Justice.
While enduring three years of pandemic conditions, many health care professionals have struggled with burnout, exhaustion and moral distress. “Much health care provider content on social media seeks to expose the difficulties of the work,” Gary added. “TikTok and Instagram reels have shown health care providers crying after losing a patient or exhausted after a night shift in the emergency department.”
A study conducted in Beijing, China and published last year found that TikTok is the world’s most rapidly growing video application, amassing 1.6 billion users in 2021. “More and more patients are searching for information on genitourinary cancers via TikTok,” the study’s authors wrote in Frontiers in Oncology, referring to cancers of the urinary tracts and male reproductive organs. Among the 61 sample videos examined by the researchers, health care practitioners contributed the content in 29, or 47 percent, of them. Yet, 22 posts, 36 percent, were misinformative, mostly due to outdated information.
More than half of the videos offered good content on disease symptoms and examinations. The authors concluded that “most videos on genitourinary cancers on TikTok are of poor to medium quality and reliability. However, videos posted by media agencies enjoyed great public attention and interaction. Medical practitioners could improve the video quality by cooperating with media agencies and avoiding unexplained terminologies.”
When health care providers post on social media, they must bear in mind that they have legal and ethical duties to their patients, profession and society, said Elizabeth Levy, founder and director of Physicians for Justice in Irvine, Calif., a nonprofit network of volunteer physicians partnering with public interest lawyers to address the social determinants of health.
“Providers are also responsible for understanding the mechanics of their posts,” such as who can see these messages and how long they stay up, Levy said. As a starting point for figuring what’s acceptable, providers could look at social media guidelines put out by their professional associations. Even beyond that, though, they must exercise prudent judgment. “As social media continues to evolve, providers will also need to stay updated with the changing risks and benefits of participation.”
Patients often research their providers online, so finding them on social media can help inform about values and approaches to care, said M. Sara Rosenthal, a professor and founding director of the program for bioethics and chair of the hospital ethics committee at the University of Kentucky College of Medicine.
Health care providers’ posts on social media also could promote patient education. They can advance informed consent and help patients navigate the risks and benefits of various treatments or preventive options. However, providers could violate ethical principles if they espouse “harmful, risky or questionable therapies or medical advice that is contrary to clinical practice guidelines or accepted standards of care,” Rosenthal said.
Inappropriate self-disclosure also can affect a provider’s reputation, said Kelly Michelson, a professor of pediatrics and director of the Center for Bioethics and Medical Humanities at Northwestern University’s Feinberg School of Medicine. A clinician’s obligations to professionalism extend beyond those moments when they are directly taking care of their patients, she said. “Many experts recommend against clinicians ‘friending’ patients or the families on social media because it blurs the patient-clinician boundary.”
Meanwhile, clinicians need to adhere closely to confidentiality. In sharing a patient’s case online for educational purposes, safeguarding identity becomes paramount. Removing names and changing minor details is insufficient, Michelson said.
“The patient-clinician relationship is sacred, and it can only be effective if patients have 100 percent confidence that all that happens with their clinician is kept in the strictest of confidence,” she said, adding that health care providers also should avoid obtaining information about their patients from social media because it can lead to bias and risk jeopardizing objectivity.
Academic clinicians can use social media as a recruitment tool to expand the pool of research participants for their studies, Michelson said. Because the majority of clinical research is conducted at academic medical centers, large segments of the population are excluded. “This affects the quality of the data and knowledge we gain from research,” she said.
Don S. Dizon, a professor of medicine and surgery at the Warren Alpert Medical School of Brown University in Providence, Rhode Island, uses LinkedIn and Doximity, as well as Twitter, Instagram, TikTok, Facebook, and most recently, YouTube and Post. He’s on Twitter nearly every day, where he interacts with the oncology community and his medical colleagues.
Also, he said, “I really like Instagram. It’s where you will see a hybrid of who I am professionally and personally. I’ve become comfortable sharing both up to a limit, but where else can I combine my appreciation of clothes with my professional life?” On that site, he’s seen sporting shirts with polka dots or stripes and an occasional bow-tie. He also posts photos of his cats.
Don S. Dizon, a professor of medicine and surgery at Brown, started using TikTok several years ago, telling medical stories in short-form videos.
Don S. Dizon
Dizon started using TikTok several years ago, telling medical stories in short-form videos. He may talk about an inspirational patient, his views on end-of-life care and death, or memories of people who have passed. But he is careful not to divulge any details that would identify anyone.
Recently, some people have become his patients after viewing his content on social media or on the Internet in general, which he clearly states isn’t a forum for medical advice. “In both situations, they are so much more relaxed when we meet, because it’s as if they have a sense of who I am as a person,” Dizon said. “I think that has helped so much in talking through a cancer diagnosis and a treatment plan, and yes, even discussions about prognosis.”
He also posts about equity and diversity. “I have found myself more likely to repost or react to issues that are inherently political, including racism, homophobia, transphobia and lack-of-access issues, because medicine is not isolated from society, and I truly believe that medicine is a social justice issue,” said Dizon, who is vice chair of diversity, equity, inclusion and professional integrity at the SWOG Cancer Research Network.
Through it all, Dizon likes “to break through the notion of doctor as infallible and all-knowing, the doctor as deity,” he said. “Humanizing what I do, especially in oncology, is something that challenges me on social media, and I appreciate the opportunities to do it on TikTok.”
Could this habit related to eating slow down rates of aging?
Last Thursday, scientists at Columbia University published a new study finding that cutting down on calories could lead to longer, healthier lives. In the phase 2 trial, 220 healthy people without obesity dropped their calories significantly and, at least according to one test, their rate of biological aging slowed by 2 to 3 percent in over a couple of years. Small though that may seem, the researchers estimate that it would translate into a decline of about 10 percent in the risk of death as people get older. That's basically the same as quitting smoking.
Previous research has shown that restricting calories results in longer lives for mice, worms and flies. This research is unique because it applies those findings to people. It was published in Nature Aging.
But what did the researchers actually show? Why did two other tests indicate that the biological age of the research participants didn't budge? Does the new paper point to anything people should be doing for more years of healthy living? Spoiler alert: Maybe, but don't try anything before talking with a medical expert about it. I had the chance to chat with someone with inside knowledge of the research -- Dr. Evan Hadley, director of the National Institute of Aging's Division of Geriatrics and Clinical Gerontology, which funded the study. Dr. Hadley describes how the research participants went about reducing their calories, as well as the risks and benefits involved. He also explains the "aging clock" used to measure the benefits.
Evan Hadley, Director of the Division of Geriatrics and Clinical Gerontology at the National Institute of Aging
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