Comment

Comment by Dr. Krishna Kumari Challa 8 hours ago

Are one in 200 men really related to Genghis Khan? Maybe not, according to a new study

In present day Kazakhstan, both local folklore and genetic evidence found buried in royal tombs have shone a light on the region's ties to Genghis Khan and the Mongol Empire. New DNA analysis of ruling elites from the Golden Horde—the northwestern extension of the Mongol Empire—reveals implications for the genetic ancestry of the broader Mongolian Empire. The findings were recently published in the Proceedings of the National Academy of Sciences.

The Golden Horde was founded and ruled by Genghis Khan's eldest son, Joshi, and his descendants. According to local folklore, one of the four tombs analyzed for this study belongs to Joshi himself and houses his remains. The additional three tombs analyzed in this study belonged to other Golden Horde ruling elites and provide evidence of Mongol cultural practices blending with local culture.

Inspired, Askapuli and his archaeologist colleagues in Kazakhstan decided to investigate whether the tales were true, in collaboration with researchers at the National Institute of Genetics, Japan.

About twenty years ago, researchers traced fragments of DNA found on the Y-chromosome, called the C3* cluster, back to medieval inhabitants of the Mongolian plateau. Today, many people across central Eurasia have this C3* cluster in their genome. Some scholars have hypothesized one reason the C3* cluster is so widespread is because of the Mongol Empire's vast sphere of control. It's even fueled the popular belief that one in 200 men is related to Genghis Khan.

But this new study's data reveal a more complicated possibility: While they did find evidence of the C3* cluster in the genome of the ruling elites, it appears in the genome of modern individuals at a much lower frequency.

Ayken Askapuli et al, Genomes of the Golden Horde elites and their implications for the rulers of the Mongol Empire, Proceedings of the National Academy of Sciences (2026). DOI: 10.1073/pnas.2531003123

**

Comment by Dr. Krishna Kumari Challa 8 hours ago

Microplastics discovered in prostate tumors
Microplastic particles were detected in 90% of prostate tumor samples and at higher concentrations than in adjacent noncancerous tissue, averaging 2.5 times more plastic per gram. These findings suggest a possible association between microplastic accumulation and prostate cancer, though further research with larger cohorts is needed to clarify causality and underlying mechanisms.
Experts have found that when plastic from food packaging, cosmetics, and other sources is used, heated, or chemically treated, it can break down into smaller pieces and become ingested. People are also exposed to plastics by inhaling them from the air and by absorbing them through the skin. Past studies have identified these microplastics in nearly every human organ, as well as in bodily fluids and the placenta. However, how they may affect human health has remained poorly understood.

Analyzing tissue samples collected from 10 patients with prostate cancer, the research team identified plastic particles in 90% of tumor samples and 70% of benign tissue samples.

In addition, the cancerous tissue contained on average 2.5 times the amount of plastic as the healthy prostate tissue samples (about 40 micrograms of plastic per gram of tissue compared with 16 micrograms per gram).
This pilot study provides important evidence that microplastic exposure may be a risk factor for prostate cancer.

Microplastics Identified in Human Prostate Cancer, American Society of Clinical Oncology's Genitourinary Cancers Symposium (2026).

https://scitechdaily.com/90-of-prostate-cancer-tumors-contained-mic...

Comment by Dr. Krishna Kumari Challa 8 hours ago

Women may face heart events at lower plaque levels than men, study finds

Less artery-clogging plaque in women's arteries did not appear to protect them from heart disease compared to men, according to a study published in Circulation: Cardiovascular Imaging. While heart disease is the leading cause of illness and death worldwide, according to the American Heart Association's 2026 Heart Disease and Stroke Statistics, women tend to have a lower prevalence of artery plaque than men, according to previous research.

The study evaluated health data for more than 4,200 adults (more than half of whom were women) to compare how quantity of plaque influenced the risk of major heart conditions. The study included people with stable chest pain and no prior history of coronary artery disease. Participants were randomized to undergo diagnostic evaluation via coronary computed tomography angiography (X-ray images of the heart and blood vessels) and followed for about two years. Key findings of the study: Fewer women had plaque in their coronary arteries than men (55% of women vs. 75% of men). Women also had a lower volume of artery plaque than men (a median of 78 mm3 among women vs. 156 mm3 in men). Despite less plaque, women were just as likely as men to die from any cause, have a non-fatal heart attack or be hospitalized for chest pain (2.3% of women vs. 3.4% of men). In addition, women faced increased heart risk at lower levels of plaque compared to men. For total plaque burden, women's risk began to rise at 20% plaque burden, while men's risk started at 28%. With increasing plaque levels, risk rose more sharply for women than for men.

The findings underscore that women are not 'protected' from coronary events despite having lower plaque volumes.

Risk in Women Emerges at Lower Coronary Plaque Burden Than in Men: PROMISE Trial, Circulation Cardiovascular Imaging (2026). DOI: 10.1161/CIRCIMAGING.125.019011

Comment by Dr. Krishna Kumari Challa 9 hours ago

Your gut microbes can be anti-aging—scientists are uncovering how to keep your microbiome youthful
The gut microbiome changes with age, typically losing diversity and increasing inflammation-promoting bacteria, which correlates with aging. Maintaining a youthful microbiome is linked to healthier aging and longevity. Diets high in fiber and regular exercise support a beneficial microbiome, while interventions like fecal transplants, postbiotics, and targeted drugs or phages are being explored to promote healthy aging.

Comment by Dr. Krishna Kumari Challa 9 hours ago

Why do falls rise with age? Study points to cerebellar neuron firing
Age-related declines in Purkinje cell firing in the cerebellum directly impair motor coordination, balance, and gait. Experimental reduction of Purkinje cell activity in young mice induced motor deficits, while enhancing firing in older mice improved performance. These findings highlight cerebellar neuron dysfunction as a key factor in increased fall risk with aging.
A new study has found a direct link between age-related declines in neuron activity in the cerebellum and worsening motor skills, including gait, balance and agility. While it is well known that these abilities diminish with age, this is the first research to pinpoint how changes in Purkinje cells—a key type of cerebellar neuron—drive this decline and translate into measurable changes in behaviour and physical function.
Purkinje cells process sensory input and internal signals from the body and send corrective messages that finetune movement. However, unlike other neurons, they can also spontaneously fire electrical signals. To test how aging affects this activity, the researchers examined motor coordination in mice ranging from young adults (two months old) to elderly (18 to 24 months old). Older mice performed worse on several coordination tasks, including crossing an elevated beam and staying on a rotating rod (Rotarod), mirroring motor decline in humans.
The team then recorded electrical activity from Purkinje cells and found significantly lower firing frequencies in older mice. To determine whether this caused the behavioral decline, they used a genetically targeted tool called a DREADD, a type of designer receptor that increases or decreases neuron excitability when activated.
When they turned on the DREADD for young mice, which made their Purkinje cells fire at lower rates, mimicking the older Purkinje cells, the researchers found that they jumped off the Rotarod sooner than young mice who did not have the DREADD.
The reverse was also true: when the researchers boosted neuron firing in older mice, those mice stayed on the Rotarod longer, suggesting improved motor coordination.
The researchers showed that spontaneous firing rates in older Purkinje cells are reduced, and if we reverse this, we improve coordination. This indicates that the change plays a direct role in the age-related decline of motor coordination.

Eviatar Fields et al, Cerebellar Purkinje cell firing reduction contributes to aging-related declining motor coordination in mice, Proceedings of the National Academy of Sciences (2026). DOI: 10.1073/pnas.2525795122

Comment by Dr. Krishna Kumari Challa 9 hours ago

When influencers raise a glass, young viewers want to join them

Exposure to social media influencer posts featuring alcohol increases young adults' immediate desire to drink by 73% compared to similar posts without alcohol. This effect is amplified when influencers are perceived as trustworthy, honest, and knowledgeable. The findings highlight the subtle influence of everyday social media content on drinking intentions among young viewers.

Exposure to Alcohol-Related Social Media Content and Desire to Drink Among Young Adults, JAMA Pediatrics (2026). DOI: 10.1001/jamapediatrics.2025.6335

Comment by Dr. Krishna Kumari Challa 9 hours ago

Rare genetic variant protects against malaria-causing parasite by making red blood cells bigger
Scientists have found that a special component in some people's blood provides them with natural protection against malaria. A recent study has demonstrated that a genetic variant named rs112233623-T reduces the activity of CCND3, a gene that normally helps control how red blood cells divide and grow. This change prompts the body to make fewer but larger-than-normal red blood cells and also leads to higher levels of reactive oxygen species (ROS) inside the cells. Together, these factors create a hostile environment for the malaria parasite to thrive and replicate.
This genetic variant is present in 10% of the population in Sardinia, an island in the Mediterranean Sea, but is rare or absent elsewhere in the world. The researchers think this phenomenon to be positive selection—a trait that likely became common because it helped people survive the disease in areas where malaria had been a major problem for centuries.
As per the findings published in Nature, replicating the reduction in CCND3 and the resulting changes in red blood cells caused by the rs112233623-T genetic variant could provide a potential therapeutic strategy to combat malaria.

Maria Giuseppina Marini et al, Reduced cyclin D3 expression in erythroid cells protects against malaria, Nature (2026). DOI: 10.1038/s41586-026-10110-9

Comment by Dr. Krishna Kumari Challa 10 hours ago

158 giant tortoises reintroduced to a Galapagos island
A total of 158 giant tortoises, bred from individuals with high genetic similarity to Floreana Island’s extinct native species, have been reintroduced to Floreana after more than a century. These tortoises, important for ecosystem functions such as seed dispersal and habitat regeneration, underwent quarantine and microchipping before release as part of a broader rewilding effort.

Source: News Agencies

Comment by Dr. Krishna Kumari Challa 10 hours ago

How your body senses cold—and why menthol feels cool

When you step outside on a winter morning or pop a mint into your mouth, a tiny molecular sensor in your body springs into action, alerting your brain to the sensation of cold. Scientists have now captured the first detailed images of this sensor at work, revealing exactly how it detects both actual cold and the perceived cool of menthol, a compound derived from mint plants.

The study focused on a protein channel called TRPM8 which acts like a microscopic thermometer inside your body. It's the primary sensor that tells your brain when it's cold.

TRPM8 sits in the membranes of sensory neurons innervating the skin, oral cavity, and eyes. It responds to cold temperatures—roughly between 46°F and 82°F—by opening up and allowing ions to flow into the cell, which triggers a nerve signal to the brain. It's also the reason menthol, eucalyptus, and certain other compounds produce that characteristic cooling sensation.

Menthol is like a trick. It attaches to a specific part of the channel and triggers it to open, just like cold temperature would. So even though menthol isn't actually freezing anything, your body gets the same signal as if it were touching ice.

The researchers discovered that cold and menthol activate the channel through shared yet distinct allosteric networks: cold primarily triggers changes in the pore region (the part that actually opens to let ions through), while menthol binds a different part of the protein and induces shape changes that propagate to the pore. When cold is combined with menthol, the response is enhanced synergistically.

The findings have medical implications. When TRPM8 doesn't function properly, it has been linked to conditions including chronic pain, migraines, dry eye and certain cancers.

https://www.biophysics.org/news-room/scientists-show-how-your-body-....

Comment by Dr. Krishna Kumari Challa 10 hours ago

2-month-olds see the world in a more complex way than people thought: study

A new study suggests that babies are able to distinguish between the different objects they see around them at 2 months old.

The findings, published this week in Nature Neuroscience, may help doctors and researchers better understand cognitive development in infancy.

It really tells us that infants are interacting with the world in a lot more complex of a way than we might imagine.

The study looked at data from 130 2-month-olds who underwent brain scans while awake. The babies viewed images from a dozen categories commonly seen in the first year of life, such as trees and animals. When babies looked at an image like a cat, their brains might "fire" a certain way that researchers could record. If they looked at an inanimate object, their brains would fire differently.

The technique—known as functional magnetic resonance imaging, or fMRI—allowed scientists to examine visual function more precisely than in the past.

So even at 2 months of age, infants can distinguish between different objects, according to this new study.

Cliona O'Doherty, Infants have rich visual categories in ventrotemporal cortex at 2 months of age, Nature Neuroscience (2026). DOI: 10.1038/s41593-025-02187-8. www.nature.com/articles/s41593-025-02187-8

• ‹ Previous
• 1
• 2
• 3
• …
• 1194
• Next ›
• Page