Title: Scientists Find Differences in Brains of Those With Dyslexia
Category: Health News
Created: 8/29/2014 9:36:00 AM
Last Editorial Review: 8/29/2014 12:00:00 AM

Title: Autism-Linked Genes Often Differ Between Siblings
Category: Health News
Created: 8/25/2016 12:00:00 AM
Last Editorial Review: 8/26/2016 12:00:00 AM

Title: College Grades Low? Try a Different Seat in the Classroom
Category: Health News
Created: 8/24/2018 12:00:00 AM
Last Editorial Review: 8/27/2018 12:00:00 AM

Title: Kids With ADHD Have Differences in 'Neural Flexibility,' Brain Study Shows
Category: Health News
Created: 7/29/2022 12:00:00 AM
Last Editorial Review: 8/1/2022 12:00:00 AM

High-throughput sequencing (HTS) technologies have been instrumental in investigating biological questions at the bulk and single-cell levels. Comparative analysis of two HTS data sets often relies on testing the statistical significance for the difference of two negative binomial distributions (DOTNB). Although negative binomial distributions are well studied, the theoretical results for DOTNB remain largely unexplored. Here, we derive basic analytical results for DOTNB and examine its asymptotic properties. As a state-of-the-art application of DOTNB, we introduce DEGage, a computational method for detecting differentially expressed genes (DEGs) in scRNA-seq data. DEGage calculates the mean of the sample-wise differences of gene expression levels as the test statistic and determines significant differential expression by computing the P-value with DOTNB. Extensive validation using simulated and real scRNA-seq data sets demonstrates that DEGage outperforms five popular DEG analysis tools: DEGseq2, DEsingle, edgeR, Monocle3, and scDD. DEGage is robust against high dropout levels and exhibits superior sensitivity when applied to balanced and imbalanced data sets, even with small sample sizes. We utilize DEGage to analyze prostate cancer scRNA-seq data sets and identify marker genes for 17 cell types. Furthermore, we apply DEGage to scRNA-seq data sets of mouse neurons with and without fear memory and reveal eight potential memory-related genes overlooked in previous analyses. The theoretical results and supporting software for DOTNB can be widely applied to comparative analyses of dispersed count data in HTS and broad research questions.

Background

Recently, cough reflex hypersensitivity has been proposed as a common underlying feature of chronic cough in adults. However, symptoms and clinical characteristics of cough hypersensitivity have not been studied amongst phenotypes of chronic cough. This study aimed to compare symptom features, such as cough triggers and associated throat sensations, of cough hypersensitivity in patients with asthmatic chronic cough and those with refractory chronic cough (RCC).

Protein abundance data of drug-metabolizing enzymes and transporters (DMETs) are useful for scaling in vitro and animal data to humans for accurate prediction and interpretation of drug clearance and toxicity. Targeted DMET proteomics that relies on synthetic stable isotope-labeled surrogate peptides as calibrators is routinely used for the quantification of selected proteins; however, the technique is limited to the quantification of a small number of proteins. Although the global proteomics-based total protein approach (TPA) is emerging as a better alternative for large-scale protein quantification, the conventional TPA does not consider differential sequence coverage by identifying unique peptides across proteins. Here, we optimized the TPA approach by correcting protein abundance data by the sequence coverage, which was applied to quantify 54 DMETs for characterization of 1) differential tissue DMET abundance in the human liver, kidney, and intestine, and 2) interindividual variability of DMET proteins in individual intestinal samples (n = 13). Uridine diphosphate-glucuronosyltransferase 2B7 (UGT2B7), microsomal glutathione S-transferases (MGST1, MGST2, and MGST3) carboxylesterase 2 (CES2), and multidrug resistance-associated protein 2 (MRP2) were expressed in all three tissues, whereas, as expected, four cytochrome P450s (CYP3A4, CYP3A5, CYP2C9, and CYP4F2), UGT1A1, UGT2B17, CES1, flavin-containing monooxygenase 5, MRP3, and P-glycoprotein were present in the liver and intestine. The top three DMET proteins in individual tissues were: CES1>CYP2E1>UGT2B7 (liver), CES2>UGT2B17>CYP3A4 (intestine), and MGST1>UGT1A6>MGST2 (kidney). CYP3A4, CYP3A5, UGT2B17, CES2, and MGST2 showed high interindividual variability in the intestine. These data are relevant for enhancing in vitro to in vivo extrapolation of drug absorption and disposition and can be used to enhance the accuracy of physiologically based pharmacokinetic prediction of systemic and tissue concentration of drugs.

Chemotherapy-induced peripheral neuropathy (CIPN) is a common side effect of chemotherapy treatment, routinely manifesting as increased pain sensitivity (allodynia) in distal extremities. Despite its prevalence, effective treatment options are limited. Cannabinoids are increasingly being evaluated for their ability to treat chronic pain conditions, including CIPN. While previous studies have revealed sex differences in cannabinoid-mediated antinociception in acute and chronic pain models, there is a paucity of studies addressing potential sex differences in the response of CIPN to cannabinoid treatment. Therefore, we evaluated the long-term antiallodynic efficacy of cannabinoid receptor type 1 (CB₁)-selective, cannabinoid receptor type 2 (CB₂)-selective, and CB₁/CB₂ mixed agonists in the cisplatin CIPN model, using both male and female mice. CB₁ selective agonism was observed to have sex differences in the development of tolerance to antiallodynic effects, with females developing tolerance more rapidly than males, while the antiallodynic effects of selective CB₂ agonism lacked tolerance development. Compound-specific changes to the female estrous cycle and female plasma estradiol levels were noted, with CB₁ selective agonism decreasing plasma estradiol while CB₂ selective agonism increased plasma estradiol. Chronic administration of a mixed CB₁/CB₂ agonist resulted in increased mRNA expression of proinflammatory cytokines and endocannabinoid regulatory enzymes in female spinal cord tissue. Ovarian tissue was noted to have proinflammatory cytokine mRNA expression following administration of a CB₂ acting compound while selective CB₁ agonism resulted in decreased proinflammatory cytokines and endocannabinoid regulatory enzymes in testes. These results support the need for further investigation into the role of sex and sex hormones signaling in pain and cannabinoid-mediated antinociceptive effects.

The consumption of ⁹-tetrahydrocannabinol (THC)- or cannabis-containing edibles has increased in recent years; however, the behavioral and neural circuit effects of such consumption remain unknown, especially in the context of ingestion of higher doses resulting in cannabis intoxication. We examined the neural and behavioral effects of acute high-dose edible cannabis consumption (AHDECC). Sprague-Dawley rats (six males, seven females) were implanted with electrodes in the prefrontal cortex (PFC), dorsal hippocampus (dHipp), cingulate cortex (Cg), and nucleus accumbens (NAc). Rats were provided access to a mixture of Nutella (6 g/kg) and THC-containing cannabis oil (20 mg/kg) for 10 minutes, during which they voluntarily consumed all of the provided Nutella and THC mixture. Cannabis tetrad and neural oscillations were examined 2, 4, 8, and 24 hours after exposure. In another cohort (16 males, 15 females), we examined the effects of AHDECC on learning and prepulse inhibition and serum and brain THC and 11-hydroxy-THC concentrations. AHDECC resulted in higher brain and serum THC and 11-hydroxy-THC levels in female rats over 24 hours. AHDECC also produced: 1) Cg, dHipp, and NAc gamma power suppression, with the suppression being greater in female rats, in a time-dependent manner; 2) hypolocomotion, hypothermia, and antinociception in a time-dependent manner; and 3) learning and prepulse inhibition impairments. Additionally, most neural activity and behavior changes appear 2 hours after ingestion, suggesting that interventions around this time might be effective in reversing/reducing the effects of AHDECC.

The aim of this study was to validate a previously developed deep learning model in 5 independent clinical trials. The predictive performance of this model was compared with the international prognostic index (IPI) and 2 models incorporating radiomic PET/CT features (clinical PET and PET models). Methods: In total, 1,132 diffuse large B-cell lymphoma patients were included: 296 for training and 836 for external validation. The primary outcome was 2-y time to progression. The deep learning model was trained on maximum-intensity projections from PET/CT scans. The clinical PET model included metabolic tumor volume, maximum distance from the bulkiest lesion to another lesion, SUV_peak, age, and performance status. The PET model included metabolic tumor volume, maximum distance from the bulkiest lesion to another lesion, and SUV_peak. Model performance was assessed using the area under the curve (AUC) and Kaplan–Meier curves. Results: The IPI yielded an AUC of 0.60 on all external data. The deep learning model yielded a significantly higher AUC of 0.66 (P < 0.01). For each individual clinical trial, the model was consistently better than IPI. Radiomic model AUCs remained higher for all clinical trials. The deep learning and clinical PET models showed equivalent performance (AUC, 0.69; P > 0.05). The PET model yielded the highest AUC of all models (AUC, 0.71; P < 0.05). Conclusion: The deep learning model predicted outcome in all trials with a higher performance than IPI and better survival curve separation. This model can predict treatment outcome in diffuse large B-cell lymphoma without tumor delineation but at the cost of a lower prognostic performance than with radiomics.

BACKGROUND AND PURPOSE:

Intracranial epidermoids temporal bone cholesteatomas, and head and neck epidermal inclusion cysts are typically slow-growing, benign conditions arising from ectodermal tissue. They exhibit increased signal on DWI. While much of the imaging literature describes these lesions as showing diffusion restriction, we investigated these qualitative signal intensities and interpretations of restricted diffusion with respect to normal brain structures. This study aimed to quantitatively evaluate the ADC values and histogram features of these lesions.

BACKGROUND AND PURPOSE:

World Health Organization (WHO) grade 2 and 3 diffuse gliomas account for approximately 5% of primary brain tumors. They are invasive and infiltrative tumors and have considerable morbidity, causing progressive neurologic deterioration. The mean survival time is <10 years from diagnosis. Surgical debulking represents first-line management. The extent of resection is associated with progression-free and overall survival. Radiologic assessment of the extent of resection is challenging. This can be underestimated on early postoperative MRI, meaning that accurate assessment may be achieved only on delayed follow-up imaging. We hypothesized that DWI may help facilitate more reliable estimates of the extent of resection on early postoperative MRI. This study aimed to assess the utility of DWI in early postoperative MRI to evaluate the extent of resection.

BACKGROUND AND PURPOSE:

There has been a distinction made in the 2001 Canadian C-Spine Rule regarding patients 65 and older and younger than 65 years of age as far as indications for cervical spine CT scanning. We sought to determine if there are differences in the symptoms, mechanisms of injury, fracture locations, and types that are still relevant in 2024.

We present a unique case of a single patient presenting with two mutationally distinct, PD-L1⁺ diffuse large B-cell lymphomas (DLBCLs). One of these DLBCLs demonstrated exceptionally high mutational burden (eight disease-associated variants and 41 variants of undetermined significance) with microsatellite instability (MSI) and an acquired PMS2 mutation with loss of PMS2 protein expression, detected postchemotherapy. This report, while highlighting the extent of possible tumor heterogeneity across separate clonal expansions as well as possible syndromic B-cell neoplasia, supports the notion that, although rare, PD-L1 expression and associated states permissive of high mutational burden (such as mismatch repair gene loss of function/MSI) should be more routinely considered in DLBCLs. Appropriate testing may be predictive of outcome and inform the utility of targeted therapy in these genetically diverse and historically treatment-refractory malignancies.

Diffuse large B-cell lymphoma (DLBCL) is a heterogenous group of lymphoid malignancies. Based on gene expression profiling, it has been subdivided into germinal center (GC)-derived and activated B-cell (ABC) types. Advances in molecular methodologies have further refined the subclassification of DLBCL, based on recurrent genetic abnormalities. Here, we describe a distinct case of DLBCL that presented in leukemic form. DNA sequencing targeting 275 genes revealed pathogenically relevant mutations of CD79B, MyD88, TP53, TBL1XR1, and PIM1 genes, indicating that this lymphoma would be best classified as MCD/C5 DLBCL, an ABC subtype. Despite an initial good clinical response to BTK inhibitor ibrutinib, anti-CD20 antibody rituxan, alkylating agent bendamustine, and hematopoietic stem-cell transplant, the lymphoma relapsed, accompanied by morphologic and molecular evidence of disease progression. Specifically, the recurrent tumor developed loss of TP53 heterozygosity (LOH) and additional chromosomal changes central to ABC DLBCL pathogenesis, such as PRDM1 loss. Acquired resistance to ibrutinib and rituxan was indicated by the emergence of BTK and FOXO1 mutations, respectively, as well as apparent activation of alternative cell-activation pathways, through copy-number alterations (CNAs), detected by high-resolution chromosomal microarrays. In vitro, studies of relapsed lymphoma cells confirmed resistance to standard BTK inhibitors but sensitivity to vecabrutinib, a noncovalent inhibitor active against both wild-type as well as mutated BTK. In summary, we provide in-depth molecular characterization of a de novo leukemic DLBCL and discuss mechanisms that may have contributed to the lymphoma establishment, progression, and development of drug resistance.

HBO's Casey Bloys was asked about the Game of Thrones author's spicy take on House of the Dragon season two.

In August, fellow reporter Jason Patinkin and I crossed on foot from northern Uganda into rebel-held South Sudan. Over the course of four days, we walked more than 40 miles through the bush, escorted by rebel soldiers, to shed light on one of the world’s most underreported conflicts.

Reporting on South Sudan’s war, which began in 2013, has always been a challenge due to the risk and logistical hurdles associated with accessing remote areas where fighting takes place. But over the past year, covering the war and its humanitarian fallout has become particularly difficult. Since the beginning of this year, South Sudan’s government has banned at least 20 foreign journalists in an apparent effort to silence reporters who had a track record of critically reporting on the government.

This systematic crackdown on the foreign press (South Sudanese journalists have long risked imprisonment and death for doing their work) coincided with two important developments. In November 2016, the United Nations warned that the violence being committed against civilians in the southern region of Equatoria risked spiraling into genocide. Then, in February, the UN declared a man-made famine, warning that 100,000 people were at risk of starving to death as a result of civil war.

Journalists seeking to cover these events were left with two equally unsavory options: self-censorship or a risky trip to rebel-held parts of the country. Only a handful of journalists have attempted the latter since fighting escalated in July last year. For us, this was our second embed with the rebels this year.

We set off from a town in northern Uganda at five in the morning, bouncing along a bumpy dirt track towards the South Sudan border. Crammed into our four-wheel drive were rebel commander Martin Abucha, a dual American and South Sudanese citizen who we planned to profile for our PBS NewsHour Weekend segment, a couple of guides, and several duffle bags stuffed with our tents, sleeping bags, emergency medical kits and provisions to last us four days.

Just as the sun began to rise above a distant range of hills that we aimed to cross later that day, our car came to a halt in front of a stream. Because of the rainy reason, it carried more water than usual. It was time to disembark and start walking, or “footing,” as South Sudanese tend to call it.

We took off our shoes and waded through the stream’s chilly waters. This was the first of a many rivers we’d have to cross along the way, either on foot or in small flimsy canoes dug out from tree trunks. Each time, we dreaded the idea of falling in with our camera gear.

The first part of our journey in northern Uganda felt very much like a hike through a national park. Passing beautiful landscapes and idyllic farming villages, one could almost forget we were headed into a war zone — but we were about to get a reality check.

We had just crossed into South Sudan when out of nowhere, two dozen armed men popped out of the tall grass and surrounded us at gunpoint.

“Stop! Who are you and where are you going?” a soldier called out in Juba Arabic from his hideout no more than 20 yards away, pointing his AK47 at us. Another one next to him had a rocket-propelled grenade propped on his shoulder, also unequivocally aiming it in our direction.

Instinctively, we threw our hands in the air and exchanged a baffled glance. Had we accidentally bumped into government soldiers? Or perhaps we had come onto the “wrong” rebels? Abucha’s group, called the Sudan People’s Liberation Army In Opposition, is the biggest but not the only armed group in Equatoria, an area rife with rival militia and bandits who exploit the security vacuum left by war.

To our relief, and only after Abucha answered a series of questions, this routine security check quickly gave way to a warm welcome. The platoon would be our escort for the next four days as we trekked to their base and to Loa, Abucha’s hometown.

Keeping up with the rebels was no easy task. Given the country’s pervasive lack of basic infrastructure, South Sudanese grow up walking for dozens of miles just to go about their daily lives. For sedentary Westerners, keeping the target pace of “two meters per second” (around five miles an hour) proved challenging amid 90-degree temperatures, all while filming and plowing our way through dense, itchy elephant grass.

The upside of the cumbersome terrain was that it kept us safe. During our four-day trip, we didn’t cross a single road, instead walking along a dizzying network of narrow bush paths the rebels seemed to know like the backs of their hands. An unwanted encounter with government troops, who tended to stick to roads and move around in vehicles as opposed to on foot, was highly unlikely.

The closest we got to government-controlled area was a visit to Loa, located just two kilometers away from a main road frequently patrolled by government soldiers. We couldn’t stay long, but the hour we spent on the ground offered us a glimpse into what villages must look like in many parts of Equatoria: burned mud huts, looted schools and clinics, fallow fields and – most strikingly – no civilians.

The war has had a devastating impact on South Sudanese communities like the one in Loa, but much of it has remained out of the limelight of international media. Our four-day venture into rebel-held South Sudan offered us a rare opportunity to report ground truths, and we are thankful for that.

The post Column: Why reporting from South Sudan is so difficult — and critically needed appeared first on PBS NewsHour.

In children aged 6 to 11, long covid seems to often present as sleep problems or abdominal issues, while adolescents report fatigue and pain

Mobile games don’t have to make sense, as evidenced by the enduring popularity of a franchise that sees players catapulting …

Continue reading "‘Foxy’s Football Islands’ Offers Up Something Very Different on Mobile"

20,000 Australian men are diagnosed with prostate cancer every year. Research conducted by Prostate Cancer Foundation of Australia (PCFA), the Australian Research Centre in Sex, Health and Society, at La ...

The post Prostate Cancer is different for gay and bisexual men appeared first on Star Observer.

The FDA doesn’t care about the First Amendment rights of the companies it regulates. It cares even less about the “free speech” rights of those companies’ sales and marketing representatives. And why should the agency care? One of FDA’s primary missions is to protect the public health and safety of the American people from illegal, adulterated and misbranded products. Doing so involves restraining food, drug, device and cosmetics companies from committing fraudulent and deceptive acts that are not protected by companies’ commercial free speech rights. Nonetheless, FDA Matters envisions opportunities for FDA and industry to broaden permissible product communications. The key is understanding history, not constitutional law.

By Ivana Magovčević-Liebisch, CEO of Vigil Neuroscience, as part of the From The Trenches feature of LifeSciVC In the last decade, our industry has made great strides in combating cancer by harnessing the body’s own immune system. As it was

The post Neuro-Immunology: The Promise Of A Differentiated Approach To Neurodegenerative Disease appeared first on LifeSciVC.

LONDON — Britain is to debate whether to legalise assisted dying for the terminally ill, potentially paving the way for the law to change. Below is a list of countries which allow people to choose to end their lives or are considering doing so.  Switzerland Switzerland legalised assisted dying in 1942 on the condition the motive is not selfish, making it the first country in the world to permit the practice. Doctors can prescribe drugs and administer them or had them over for self-administration. A number of Swiss organisations such as Dignitas offer their services to foreign nationals.   United States Medical aid in dying, also known as physician assisted dying is legal in 10 states: California, Colorado, Hawaii, Montana, Maine, New Jersey, New Mexico, Oregon, Vermont and Washington, plus the District of Columbia. Oregon was the first state to legalise it under a law which came into effect in 1997. It allows mentally competent patients who are terminally ill and with less than six months to live to ask for life-ending medication. People from outside Oregon may travel to the state to take advantage of the law. 

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The Hon'ble Madras High Court in the case of Asir Automobiles (P.) Ltd. v. Assistant Commissioner (ST), Tuticorin [Writ Petition (MD) No. 3785 to 3789 of 2024 dated July 24, 2024] held that when the Assessee had reversed credit availed on the supplies that were returned for which the supplier had is

Chimpanzee “helicopter moms” often protect their offspring from bullies, but bonobo moms are more hands-off

An analysis of thousands of cognitive tests carried out by chimpanzees finds that the number of spectators influenced their performance in different ways depending on the difficulty of the task

In the late 60s and early 70s there was an epidemic of “everything I hate is fascism.”  We seem to be back to that again.  But there are differences, and they are important. We warned then, and it is worth repeating now, that we use a narrow and precise definition of fascism because it is … Continue reading On Fascism–Things Are Different Now