Tracing the start of COVID-19 in GA

At a time when COVID-19 appears to be receding in much of Georgia, it’s worth revisiting the start of the pandemic in early 2020. Emory virologist Anne Piantadosi and colleagues have a paper in Viral Evolution on the earliest SARS-CoV-2 genetic sequences detected in Georgia. Analyzing relationships between those virus sequences and samples from other states and countries can give us an idea about where the first COVID-19 infections in Georgia came from. We can draw Read more

Reddit as window into opioid withdrawal strategies

Drug abuse researchers are using the social media site Reddit as a window into the experiences of people living with opioid addiction. Abeed Sarker in Emory's Department of Biomedical Informatics has a paper in Clinical Toxicology focusing on the phenomenon of “precipitated withdrawal,” in collaboration with emergency medicine specialists from Penn, Rutgers and Mt Sinai. Precipitated withdrawal is a more intense form of withdrawal that can occur when someone who was using opioids starts medication-assisted treatment Read more

CROI: HIV cure report and ongoing research

The big news out of CROI (Conference on Retroviruses and Opportunistic Infections) was a report of a third person being cured of HIV infection, this time using umbilical cord blood for a hematopoetic stem cell transplant. Emory’s Carlos del Rio gave a nice overview of the achievement for NPR this morning. As del Rio explains, the field of HIV cure research took off over the last decade after Timothy Brown, known as “the Berlin patient,” Read more

Cancer

Personalized molecular medicine part 2

This is a continuation of the post from last week on the early-onset epilepsy patient, whom doctors were able to devise an individualized treatment for. The treatment was based on Emory research on the molecular effects of a mutation in the patient’s GRIN2A gene, discovered through whole exome sequencing.*

For this patient, investigators were able to find the Ray Ban Baratas cause for a previously difficult to diagnose case, and then use a medication usually used for Alzheimer’s disease (memantine) to reduce his seizure frequency.

Last week, I posed the question: how often do we move from a disease-causing mutation to tailored treatment? Read more

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Souped-up method for iPS cell reprogramming

Peng Jin and collaborators led by Da-Hua Chen from the Institute of Zoology, Chinese Academy of Sciences have a new paper in Stem Cell Reports. They describe a souped-up method for producing iPS cells (induced pluripotent stem cells).

Production of iPS cells in the laboratory is becoming more widespread. Many investigators, including those at Emory, are using the technology to establish “disease in a dish” models and derive iPS cells from patient donations, turning them into tools for personalized medicine research.

Read more

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True personalized medicine: from mutation to treatment

Stephen Traynelis and Hongjie Yuan

Stephen Traynelis, PhD and Hongjie Yuan, MD, PhD

How often can doctors go from encountering a patient with a mysterious disease, to finding a mutation in a gene that causes that disease, to developing a treatment crafted for that mutation?

This is true personalized molecular medicine, but it’s quite rare.

How rare this is, I’d like to explore more, but first I should explain the basics.

At Emory, Stephen Traynelis and Hongjie Yuan have been working with Tyler Pierson, David Adams, William Gahl, Cornelius Boerkoel and doctors at the National Institutes of Health’s Undiagnosed Diseases Program (UDP) to investigate the effects of mutations in the GRIN2A gene.

Their report on the molecular effects of one such mutation, which caused early-onset epilepsy and intractable seizures in a UDP patient, was recently published in Nature Communications.

With that information in hand, UDP investigators were able to repurpose an Alzheimer’s medication as an anticonvulsant that was effective in reducing seizure frequency in that patient. [The details on that are still unpublished but coming soon.]

Read more

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Local events: complex neuro diseases, DNA repair

Just a note for Atlanta-area readers about two interesting lecture series.

One is the Suddath Symposium, a two-day event today and Friday at Georgia Tech focusing on DNA repair in human disease. This is an area that Emory is strong in: Gray Crouse, Paul Doetsch, Willian Dynan and Gang Bao are speaking (all on Friday).

Another is a series of talks from Emory investigators on http://www.raybani.com/ complex neurological diseases, being put on by the Department of Cell Biology. Four, one a week (originally), all on Wednesdays at 4 pm in Whitehead 400.

Yesterday: Peter Wenner (homeostatic mechanisms/scaling). Feb. 26: Shannon Gourley (stress hormones/distorted decision-making/depression). March 5: Andrew Escayg (sodium channels/inherited epilepsy). Kerry Ressler (fear learning/PTSD) was supposed to be last week but that was derailed by ice. So Ressler will speak  on May 21, according to organizer Victor Faundez, who chose Picasso’s Guernica as the visual theme.

 

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Talkin’ about epigenetics

This intriguing research has received plenty of attention,  both when it was presented at the Society of Neuroscience meeting in the fall and then when the results were published in Nature Neuroscience.

The short summary is: researchers at Yerkes National Primate Research Center found that when a mouse learns to become afraid of a certain odor, his or her pups will be more Gafas Ray Ban Baratas sensitive to that odor, even though the pups have never encountered it. Both the parent mouse and pups have more space in the smell-processing part of their brains, called the olfactory bulb, devoted to the odor to which they are sensitive.

[Note: a feature on a similar phenomenon, transgenerational inheritance of the effects of chemical exposure, appeared in Science this week]

Somehow information about the parent’s experiences is being inherited. But how? Brian Dias and Kerry Ressler are now pursuing followup experiments to firmly establish what’s going on. They discuss their research in this video:

 

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Eyes on dopamine

Dopamine-restoring drugs already used to treat Parkinson’s disease may also be beneficial for the treatment of diabetic retinopathy, a leading cause of blindness in adults, researchers have discovered. The results were published recently in Journal of Neuroscience.

Diabetic retinopathy affects more than a quarter of adults with diabetes and threatens the vision of more than 600,000 people in the United States. Doctors had previously thought most of the impairment of vision in diabetic retinopathy came from damage to the blood vessels induced by high blood sugar, but had known that dopamine, a vital neurotransmitter in the brain, was also important in the retina.

“There was some evidence already that dopamine levels were reduced in diabetic retinopathy, but what’s new here is: we can restore dopamine levels and improve visual Ray Ban outlet function in an animal model of diabetes,” says Machelle Pardue, PhD, associate professor of ophthalmology at Emory University School of Medicine and research career scientist at the Atlanta VA Medical Center. Read more

Posted on by Quinn Eastman in Neuro 1 Comment

Estrogen receptor gene guides bird behavior

Please head over to our sister blog eScienceCommons to learn about how two types of white-throated sparrow have differences in behavior, which are driven by a chromosomal alteration. Scientists at Emory showed that changes in the estrogen receptor gene are responsible for the behavior differences.

White-striped birds tend to be http://www.magliettedacalcioit.com more aggressive and less parental than the tan-striped birds, you will learn. Hey, that sounds sort of like prairie voles and meadow voles.

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Hypoxia is bad, except when it’s good

Randy Trumbower and his colleagues in Emory’s Department of Rehabilitation Medicine recently published a study showing that “daily intermittent hypoxia,” combined with walking exercise, can help patients with incomplete spinal cord injury walk for longer times. What is it about being deprived of oxygen for short periods that has a positive effect?

This research was puzzling at first (at least to your correspondent) because “daily intermittent hypoxia” is a good description of the gasping and snorting interruptions of sleep apnea.

Sleep apnea is a very common condition that increases the risk of high blood pressure, diabetes, heart attack and stroke. On the other side of the coin, many endurance athletes have been harnessing the body’s ability to adapt to low oxygen levels — so-called altitude training — to increase their performance for years.

So we have an apparent clash: hypoxia is bad, except when it’s good. Looking closely, there are some critical differences between sleep apnea and therapeutic hypoxia. The dose makes the poison, right? Read more

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The classic epilepsy surgery case

The epilepsy patient Henry Molaison, known for most of the 20th century as H.M., is one of the most famous in neuroscience. His case played an important role in telling scientists about structures of the brain that are important for forming short-term and long-term memories.

To control H.M.’s epilepsy, neurosurgeon William Scoville http://www.raybandasoleit.com/ removed much of the hippocampi, amygdalae and nearby regions on both sides of his brain. After the surgery, H.M. suffered from severe anterograde amnesia, meaning that he could not commit new events to explicit memory. However, other forms of his memory were intact, such as short-term working memory and motor skills.Henry_Gustav_1

This classic case helps us understand the advances that neurosurgeons at Emory are achieving today. The surgeries now used to treat some medication-resistant forms of epilepsy are similar to what was performed on H.M., although they are considerably less drastic. Usually tissue on only one side of the brain is removed. Still, there can be cognitive side effects: loss of visual or verbal memory abilities, and deficiencies in the ability to name or recognize objects, places or people.

Neurosurgeon Robert Gross has been a pioneer in testing a more precise procedure, selective laser amygdalohippocampotomy (SLAH), which appears to control seizures while having less severe side effects. Neuropsychologist Daniel Drane reported at the recent American Epilepsy Society meeting on outcomes from a series of SLAH surgeries performed at Emory.

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Alzheimer’s drug discovery: looking under the right ROCK

Developing drugs that can change the progression of Alzheimer’s disease is a huge challenge. In the last few years, more than one pharmaceutical firm have abandoned clinical programs in Alzheimer’s that once looked promising. Still, Emory and Scripps scientists have found an approach that deserves a second look and more investigation.

One straightforward drug strategy against Alzheimer’s is to turn down the brain’s production of beta-amyloid, the key component of the disease’s characteristic plaques. A toxic fragment of a protein found in healthy brains, beta-amyloid accumulates in the brains of people affected by the disease.

The enzyme that determines how much beta-amyloid brain cells generate is called BACE (beta-secretase or beta-site APP cleaving enzyme). Yet finding drugs that inhibit that elusive enzyme has been far from straightforward.

Now researchers  have identified a way to shut down production of beta-amyloid by diverting BACE to a different part of the cell and inhibiting its activity. The results were published this week in Journal of Neuroscience. Read more

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