Archive for June, 2017
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Scientists Modify Viruses with CRISPR to Kill Antibiotic-Resistant Bacteria – Futurism
CRISPR-Powered Viruses
Earlier this month, the annualCRISPR 2017 conferencewas held at Montana State University. Attendees were the first to hear about successes companies have had using CRISPR to engineer viruses to kill bacteria. One of the most exciting potential application for these viruses, called bacteriophages, would be killingbacteria that have becomeresistant to antibiotics. At least two of the companies aim to start clinical trials of these engineered viruses within 18 to 24 months.
The use of bacteriophages isnt new. In the past, they have been isolated in the wild and purified for use.Although bacteriophages are regarded as being safe and effective for use in humans, because they are found in the wild, research on them has been sluggish. New discoveries cant be patented, and furthermore, these discoveries can also betransient, because bacteria can, and often do, rapidly evolve.
However, usingCRISPR to engineer them is definitely innovative. It renders viruses uniquely lethal to the most dangerous bacteria in the world, and initial tests saved the lives of mice who were infected withantibiotic-resistant infections that would have ultimately killed them, explained conference speaker Rodolphe Barrangou, chief scientific officer of Locus Biosciences.
This ability has lead researchers from at least two companies to useCRISPR in an attempt to turnthe tables on antibiotic-resistant bacteria. Both companies cite treating bacterial infections linked to serious diseases as their primary goal. Eventually, they intend to engineer viruses that would allow them to do much more by taking a precision approach to the human microbiome as a whole. The idea would be to selectively remove any bacteria that occur naturally andhave been associatedwith various health conditions. This could be anything from autism to obesity and possibly even some forms of cancer.
Onecompany, Locus, is using CRISPR to send DNA that will create modified guide RNAs tofind pieces of the antibiotic-resistance gene. After the virus infects the bacterium and the guide RNA connects with the resistance gene, the bacterium produces a phage-killing enzyme called Cas3. This is the bacteriums usual response, only in this instance,it destroys its own antibiotic-resisting genetic sequence. Over time Cas3 destroys all of the DNA, and the bacterium dies.
Another company, Eligo Bioscience, is taking a slightly different approach. The team chose to insertthe DNA that creates guide RNAs (this time with the bacterial enzyme Cas9), which removes all genetic replication instructions. Cas9 then severs the DNA of the bacterium at a specific place, and that cut triggers the self-destruct mechanism in the bacterium.
The third approach, by Synthetic Genomics,involves creating supercharged phages thatcontain dozens of enzymes. Each enzyme offers its own unique set of benefits, including the ability to camouflage the phages from the human immune system by breaking down proteins or biofilms.
Despite these promising results thus far, there will be challenges to bringing successfulengineered phages to market. For example, there is a risk that phages could actually spread genes for antibiotic-resistance to non-resistant bacteria. Another potential issue is that it might take a very large number of phages to treat an infection, which in turn could trigger immune reactions that would sabotage the treatment.
Ideally, though, if clinical trials go well, engineered phages could provide humans with a powerful weapon in the fight against superbugs.A fight that has, thus far, included a variety of strategies. Whenever it happens, it wouldnt be soon enough:this past January, the Centers for Disease Control (CDC) reported that a patient died from a superbug that was resistant to all 26 antibiotics available in the US.
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Scientists Modify Viruses with CRISPR to Kill Antibiotic-Resistant Bacteria - Futurism
Brave Aimee delighted to be back at Barrow school after months in hospital – NW Evening Mail
A BRAVE Barrow girl is delighted to be back at school after eight months away fighting leukaemia and recovering from complications following a stem cell transplant.
Bubbly Aimee Robinson returned to St James' CE Junior School this week to a warm welcome from her friends and teachers, who have all missed having her at the Barrow primary.
The eleven-year-old last attended the Blake Street school for three weeks in September as she is a patient at the Royal Manchester Children's Hospital, where she has battled leukaemia.
Following aggressive chemotherapy, Aimee had a stem cell transplant using umbilical cord blood. She did well following the transplant and spent time in isolation. But she later developed graft versus host disease. This is when particular types of white blood cell in the donated bone marrow or stem cells attack a body's own cells.
Aimee had to spend further time in isolation as she recovered from GVHD.
Aimee, who was first diagnosed with leukaemia in January 2016, is now in remission and the treatment for GVHD is also working. She was eventually allowed home to Barrow last month, but she has treatment at the Manchester hospital every fortnight.
Medics then gave her the OK to return to school this week to complete her final year of primary school, Year Six, before she prepares to attend Furness Academy in September.
Aimee, who is a house captain and school council member at St James' school, said: "It feels great to be at school with my friends. St James' is the best school ever."
Her great friend, Abbie Gelling, 11, said it is really great to have Aimee back, as they had to keep in touch through FaceTime, texts and letters.
Angela Rawlinson, the headteacher at St James' CE Junior School, said: "We are so thrilled to have Aimee back at school. It's such great news. Aimee loves school and learning.
"It was very important for Aimee to get back to school before they all move on to secondary school."
The St James' school community raised 3,000 to help Aimee and her family who have spent so much time away from home. The community also fundraised to support the pupil.
Aimee has been doing her schooling in hospital with input from St James' school.
Aimee's mum, Joanne Robinson, said: "Aimee has been raring to get back to school, she missed all her friends and teachers. She wanted to go back as soon as possible.
"Nothing bothers Aimee, she just gets on with it. She is a superstar.
"There is no sign of the leukaemia now, her bone marrow is working brilliantly."
Mrs Robinson thanked all the medics, the St James' community and the wider community.
She said: "Thank you to everyone for the love and support they have given our family over the past 18 months and for the support we continue to receive."
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Brave Aimee delighted to be back at Barrow school after months in hospital - NW Evening Mail
Twins Separated at Birth Reveal Staggering Influence of …
WASHINGTON Jim Lewis and Jim Springer were identical twins raised apart from the age of 4 weeks. When the twins were finally reunited at the age of 39 in 1979, they discovered they both suffered from tension headaches, were prone to nail biting, smoked Salem cigarettes, drove the same type of car and even vacationed at the same beach in Florida.
The culprit for the odd similarities? Genes.
Genes can help explain why someone is gay or straight, religious or not, brainy or not, and even whether they're likely to develop gum disease, one psychologist explains.
Such broad-ranging genetic effects first came to light in a landmark study Minnesota Twin Family Study conducted from 1979 to 1999, which followed identical and fraternal twins who were separated at an early age. [Seeing Double: 8 Fascinating Facts About Twins]
"We were surprised by certain behaviors that showed a genetic influence, such as religiosity [and] social attitudes," said Nancy Segal, an evolutionary psychologist at California State University, Fullerton, who was part of the study for nine years. "Those surprised us, because we thought those certainly must come from the family [environment]," Segal told Live Science. Segal described the groundbreaking research on Aug. 7 here at a meeting of the American Psychological Association.
Born together, raised apart
Researchers at the University of Minnesota, led by Thomas Bouchard, launched the landmark study in 1979. Over the course of 20 years, they studied 137 pairs of twins 81 pairs of identical twins (twins who developed from one egg that split in two), and 56 pairs of fraternal twins (twins who developed from two eggs fertilized by two different sperm).
The Jim twins were probably the most famous set of twins involved in the study, but other pairs were equally fascinating. One pair of female twins in the study were separated from each other at 5 months old, and weren't reunited until age 78, making them the world's longest separated pair in Guinness World Records.
The Minnesota study resulted in more than 170 individual studies focusing on different medical and psychological characteristics.
In one study, the researchers took photographs of the twins, and found that identical twins would stand the same way, while fraternal twins had different postures.
Another study of four pairs of twins found that genetics had a stronger influence on sexual orientation in male twins than in female twins. A recent study in Sweden of 4,000 pairs of twins has replicated these findings, Segal said. [5 Myths About Gay People Debunked]
Nature vs. nurture
A 1986 study that was part of the larger Minnesota study found that genetics plays a larger role on personality than previously thought. Environment affected personality when twins were raised apart, but not when they were raised together, the study suggested.
Reporter Daniel Goleman wrote in The New York Times at the time that genetic makeup was more influential on personality than child rearing a finding he said would launch "fierce debate."
"We never said [family environment] didn't matter," Segal said at the APA meeting. "We just made the point that environment works in ways we hadn't expected."
Another study, commissioned by the editor of the journal Science, looked at genetics and IQ. The Minnesota researchers found that about 70 percent of IQ variation across the twin population was due to genetic differences among people, and 30 percent was due to environmental differences. The finding received both praise and criticism, but an updated study in 2009 containing new sets of twins found a similar correlation between genetics and IQ.
Moreover, a study in 1990 found that genetics account for 50 percent of the religiosity among the population in other words, both identical twins raised apart were more likely to be religious or to be not religious, compared with unrelated individuals.
Other studies found a strong genetic influence on dental or gum health. That research helped to show that gum disease isn't just caused by bacteria, it also has a genetic component, Segal said.
Another study found that happiness and well-being had a 50 percent genetic influence.
In another study, researchers surveyed the separated twins about how close they felt to their newfound sibling. Among identical twins, 80 percent of those surveyed reported feeling closer and more familiar with their twin than they did to their best friends, suggesting a strong genetic component in the bond between identical twins.
The Minnesota study gave scientists a new understanding of the role of genes and environment on human development, Segal said. In the future, twin studies will aim to link specific genes to specific behaviors, as well as investigate epigenetics what turns genes on or off, she said.
Segal, who wrote a book about the study called "Born Together Reared Apart: The Landmark Minnesota Twins Study" (Harvard University Press, 2012), is now doing a prospective study of Chinese twins raised apart, often in different countries, by adoptive families.
Follow Tanya Lewis on Twitterand Google+. Follow us @livescience, Facebook& Google+. Original article onLive Science.
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Twins Separated at Birth Reveal Staggering Influence of ...
Florida higher education official said women may earn less than men because of genetics – New York Daily News
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