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Comment by Dr. Krishna Kumari Challa on Friday

Microplastics block blood flow in the brain, mice study reveals

Real-time imaging shows how plastic-stuffed cells form clumps that affect mouse movement.

In mice, immune cells carry microplastics — specks of plastic less than 5 millimetres long — through the bloodstream, where they eventually become lodged in blood vessels in the brain. The plastic-packed cells appeared in the mice’s brains just hours after they were given polystyrene-laced water and piled up “like a car crash in the blood vessels”, says biomedical researcher and study author Haipeng Huang. The obstructions sometimes cleared eventually, but others stayed stuck for the entire month-long observation period and had effects including impairing the mice’s mobility. It’s not clear whether such blockages occur in people.

https://www.nature.com/articles/d41586-025-00178-0?utm_source=Live+...

https://www.science.org/doi/10.1126/sciadv.adr8243

Comment by Dr. Krishna Kumari Challa on Friday

Researchers first took all 17,841 genetic variants from the 136 "hot spots" and inserted them into human neural cells to see how they acted in a living system. After putting the variants through the massively parallel reporter assay, researchers found that 683 of the 17,841 genetic variants had a measurable effect on gene regulation.
The researchers then categorized the 683 variants into two groups: those shared across multiple disorders (pleiotropic variants) and those specific to a single disorder (disorder-specific variants). After dividing them into categories, researchers performed a tried-and-true scientific method: compare and contrast.

Pleiotropic variants were found to be more active and more sensitive to change compared to disorder-specific variants. Researchers noted that pleotropic variants were active for much longer during brain development, compared to disease-specific ones. This extended activity suggests that pleiotropic variants may be influencing multiple stages of neurodevelopment and potentially contributing to various observable traits and disorders.

Additionally, the genes affected by these pleiotropic variants appear to be more sensitive to changes, meaning disruptions in these genes could have a bigger impact on human health.

The proteins produced by these genes are also highly connected to other proteins. Changes to these proteins in particular could ripple through the network, potentially causing widespread effects on the brain.
These findings mark an important step toward understanding how genetics contributes to shared symptoms across psychiatric disorders. Targeting these variants, their associated genes, and pathways could pave the way for treatments that address multiple conditions at once.

Sool Lee et al, Massively parallel reporter assay investigates shared genetic variants of eight psychiatric disorders, Cell (2025). DOI: 10.1016/j.cell.2024.12.022

Part 2

Comment by Dr. Krishna Kumari Challa on Friday

Eight psychiatric disorders share the same genetic causes, study says

Psychiatric disorders often overlap and can make diagnosis difficult. Depression and anxiety, for example, can coexist and share symptoms. Schizophrenia and anorexia nervosa. Autism and attention deficit/hyperactivity disorder, too. But, why?

Life experiences, environment, and genetics can all influence psychiatric disorders, but much of it comes down to variations in our genetics. Over the past few years, scientists in the field of psychiatric genetics have found that there are common genetic threads that may be linking and causing coexisting psychiatric disorders.

In 2019, researchers at the Psychiatric Genomics Consortium, Harvard University, and the UNC School of Medicine identified 136 "hot spots" within the genome that are associated with eight psychiatric disorders. Among them, 109 hot spots were shared among multiple disorders, or "pleiotropic."

A new genetic study has successfully delineated the functional consequences of genetic variants into two groups. Their findings, which were published in Cell, suggest that pleiotropic variants may be optimal targets for treatment, due to their extended roles in development and sensitivity to change.

Pleiotropy was traditionally viewed as a challenge because it complicates the classification of psychiatric disorders. However, if we can understand the genetic basis of pleiotropy, it might allow us to develop treatments targeting these shared genetic factors, which could then help treat multiple psychiatric disorders with a common therapy.

The human genome acts as the body's operating manual, containing the instructions that helped us develop from a single cell into a whole person. However, everyone's genetic foundation is unique. There are specific regions of the genome that are prone to genetic variations.

Specific genetic variants can impact biological processes, like protein overproduction or altered synapse formation, affecting brain development and contributing to psychiatric disorder. But researchers are armed with tools to track these variants and learn more about the origins of disease.

In 2019, an international team of researchers at the UNC School of Medicine and the Psychiatric Genomics Consortium conducted genome-wide association studies (GWAS) on eight disorders: autism spectrum disorder, attention deficit/hyperactivity disorder (ADD), schizophrenia, bipolar disorder, major depressive disorder, Tourette syndrome, obsessive-compulsive disorder (OCD), and anorexia nervosa, to better understand the shared genetic underpinnings between psychiatric disorders. The analysis previously revealed 136 "hot spots" on the genome that have a causal effect on one or more of the eight psychiatric disorders. Of those, 109 of these locations were identical across more than one disorder.

As part of their latest study, researchers wanted to pry more information from the genetic variants embedded within these 136 "hot spots." Using a powerful technology, called a massively parallel reporter assay, they sought to determine which causal variants could be interfering with gene regulation.

Gene regulation controls how and when proteins are produced in the body, allowing the tiny machines to carry out a wide array of functions in the body. If certain variants are interfering with this important process, researchers can use that information to home in on the variants of interest and use them as new targets for treatment.

Part 1

Comment by Dr. Krishna Kumari Challa on Friday

Mitochondria may be a promising therapeutic target for inflammatory diseases

Scientists have discovered how mitochondria influence the body's immune response through modulating specific cell signaling pathways, according to a study published in Science Advances.

The findings highlight the potential of targeting mitochondrial function specifically in immune cells to treat a range of inflammation-related diseases.

Therapies aimed at improving mitochondrial activity could benefit inflammatory diseases such as inflammatory bowel disease, sepsis, and chronic infections by enhancing the immune system's ability to regulate inflammation.

Mitochondria contain the mitochondrial electron transport chain (ETC), or a series of protein complexes in which electrons pass through and produce ATP, or energy, for the cell. Mitochondrial ETC function also controls macrophages, or specialized immune cells that are essential for fighting infections and regulating inflammation in the body.

Macrophages also release an anti-inflammatory protein called IL-10, which reduces inflammation and prevents excess immune responses that can harm the body. The underlying mechanisms that allow mitochondrial ETC to control macrophage immune responses, however, have remained poorly understood.

Using bulk-RNA sequencing to study mice with macrophages deficient in mitochondria ETC complex III, the scientists discovered that a type of reactive oxygen species (ROS), or unstable molecules that contain oxygen and easily react with other molecules in a cell, that is produced by mitochondrial complex III, called superoxide, is critical for macrophages to release IL-10.

The scientists also discovered those mice with the defective mitochondrial complex also struggled to recover from infection and inflammation because their cells released less IL-10. However, activating a specific ROS dependent signaling pathway in the cells restored IL-10 release, according to the study.

This finding highlights a previously unknown connection between mitochondrial activity, inflammation control and the signaling pathways that regulate it.

Overall, the findings underscore mitochondria's essential role beyond energy production and suggest that mitochondria may be a promising therapeutic target for treating a range of inflammatory diseases and enhancing current therapies, according to the researchers.

Boosting IL-10 levels through mitochondrial pathways offers promise for managing autoimmune disorders like rheumatoid arthritis and lupus, where the immune system mistakenly attacks the body. Enhancing the function of mitochondrial complex III, or mimicking its effects, may also improve recovery from severe infections. Additionally, inhibiting mitochondrial complex III would decrease IL-10 suppression of inflammation, and could cooperate with existing immunotherapies.

 Joshua S. Stoolman et al, Mitochondria complex III–generated superoxide is essential for IL-10 secretion in macrophages, Science Advances (2025). DOI: 10.1126/sciadv.adu4369

Comment by Dr. Krishna Kumari Challa on Friday

Mane attraction: Molecular 'switch' may control long scalp hair

Treating hair loss may be as simple as developing therapies to flip a molecular "switch," according to a new study by researchers .

The researchers reviewed the biological and social evolution of human scalp hair. Based on their analysis, they proposed a novel theory that points to a molecular basis underlying the ability to grow long scalp hair. In short, human ancestors may have always had the ability to grow long scalp hair, but the trait remained dormant until certain environmental and biological conditions—like walking upright on two legs—turned on the molecular program.

The team published their findings, which they said could serve as the basis for future experimental work, in the British Journal of Dermatology.

Humans grow extremely long scalp hair.

Likewise, attributes of scalp hair—its length, shape, color and loss of hair—play an essential role in social communication. They signify our ancestry, age, health, sexual maturity and social status, to name but a few. And yet, despite the importance of having long scalp hair, we know very little about how this feature of human skin came about and how it is regulated.

Previous research had shown that tightly curled hair, in particular, served as an effective shield against the sun, reducing the need for excessive sweating that can cause dangerous dehydration. 

Building on this work, the researchers proposed that long scalp hair initially evolved to protect early human ancestors in equatorial Africa from the intense heat and solar radiation of their environment, and then it came to have meaning in many other spheres of life, such as signaling age, health, maturity and social status.

Long, tightly curled hair was a crucial adaptation that allowed our ancestors to thrive in hot, open environments. Understanding when long scalp hair evolved will help to better appreciate when it acquired its essential non-biological purposes.

While long hair is rare among mammals, it is not entirely unique to humans. Animals like male lions, orangutans and even now-extinct wooly mammoths also grew remarkably long hair, albeit for different reasons, according to the researchers.

What these examples tell us is that the molecular blueprint for growing very long hair has always existed, albeit often in a 'silenced' state. When human ancestors evolved their ability to grow extremely long scalp hair, it was likely accomplished by just a few genetic tweaks that reactivated a dormant program rather than via the evolution of an entirely new molecular mechanism.

The findings have broader implications for medical research, particularly in addressing hair loss, a condition that impacts millions worldwide. Understanding how human scalp hair follicles normally grow very long hair will naturally result in novel molecular targets for more efficacious therapies for hair loss.

This knowledge could lead to treatments that help restore hair growth and alleviate the emotional distress that often accompanies hair loss.

Lo-Yu Chang et al, Evolution of long scalp hair in humans, British Journal of Dermatology (2025). DOI: 10.1093/bjd/ljae456

Comment by Dr. Krishna Kumari Challa on Friday

In addition to fieldwork, laboratory experiments revealed that methanotrophic microbes are remarkably adaptable. They thrive in a range of environmental conditions, including shifts in temperature, salinity, and methane levels.
As ecosystems change, methane-eating microbes adapt. When one group struggles, another takes over, keeping nature's methane filter running even in a warming world.

Tim de Groot. Environmental controls on microbial methane oxidation in the coasta... ( PhD Dissertation)

Part 2

Comment by Dr. Krishna Kumari Challa on Friday

An underestimated source of methane found in shallow coastal waters

Shallow coastal waters are hotspots for methane emissions, releasing significant amounts of this potent greenhouse gas into the atmosphere and contributing to global warming. New research highlights how tides, seasons, and ocean currents strongly influence methane emissions and how tiny microorganisms, called methanotrophs, help reduce their impact.

While human-made sources of methane are well-studied, natural sources like coastal waters remain less understood. These shallow, dynamic ecosystems are rich in methane, and because the water is not very deep, methane-eating microbes (methanotrophs) have little time to break it down before it escapes into the atmosphere.

The study investigated three regions: the Doggerbank seep area in the North Sea, the Dutch Wadden Sea, and coastal waters near Svalbard in the Arctic. Findings revealed that methane emissions are highly influenced by natural factors like tides and seasonal changes, which also affect the activity of methane-eating microbes.

In the Wadden Sea, methane levels and emissions were higher during warmer seasons when microbial activity was stronger. However, even in colder seasons, methane concentrations remained high, with windy conditions contributing to significant atmospheric releases. Tidal currents transported methane into neighboring waters, where it could still escape into the atmosphere, highlighting the broader impact of coastal methane dynamics.
At the Doggerbank seep area, falling tides triggered bursts of methane release while also stimulating microbial activity in deeper waters. However, during cooler autumn months, when water mixed, microbial activity decreased, leading to more methane escaping into the atmosphere compared to summer.

In the Arctic near Svalbard, methane concentrations were highest near the seafloor, where diverse and abundant microbial communities were present. Ocean currents played a key role in spreading methane and microbes, limiting their ability to fully break down the gas before it reached the atmosphere.
Part 1

Comment by Dr. Krishna Kumari Challa on Friday

Smart fabric can heat up by 30°C after 10 minutes of sun exposure

A new type of cloth developed by researchers at the University of Waterloo can heat up when exposed to the sun thanks to innovative nanoparticles embedded in the fabric's fibers. This advance represents an innovative and environmentally friendly option for staying warm in the winter.

Wearable heated clothing typically relies on metals or ceramic heating elements to heat up and an external power source, which could pose safety risks for users.

This new cloth incorporates conductive polymer nanoparticles that can heat up to 30°C when exposed to sunlight. The design requires no external power and can also change color to visually monitor temperature fluctuations. The study was recently published in Advanced Composites and Hybrid Materials.

The magic behind the temperature-sensitive color change lies in the combination of nanoparticles embedded in the polymer fibers. The nanoparticles are activated by sunlight, enabling the fabric to absorb heat and convert it into warmth.

The fiber is created using a scalable wet-spinning process, combining polyaniline and polydopamine nano particles to enhance light absorption and improve photothermal conversion. Thermoplastic polyurethane serves as the spinning matrix, while thermochromic dyes enable the reversible color-changing feature. The resultant fiber can be woven into fabric for wearable applications.

In addition to its temperature-changing capability, the Waterloo researchers' new fabric can stretch out by as much as five times its original shape and withstand as much as two-dozen washings while still maintaining its function and appearance. Its reversible color-changing ability provides a built-in temperature monitoring feature to ensure the wearer's safety and convenience.

The fabric's potential applications include aiding in cold rescue situations and solar-powered pet clothing to help keep them comfortable when outside during the winter.

 Fangqing Ge et al, Color tunable photo-thermochromic elastic fiber for flexible wearable heater, Advanced Composites and Hybrid Materials (2024). DOI: 10.1007/s42114-024-00994-4

Comment by Dr. Krishna Kumari Challa on Friday

Uncovering the role of Y chromosome genes in male fertility in mice

Researchers at the Crick have uncovered which genes on the Y chromosome regulate the development of sperm and impact fertility in male mice. This research could help us understand why some men don't produce enough sperm and are infertile.

Males typically have one copy of the Y chromosome and one copy of the X chromosome, whereas females typically have two X chromosomes. Scientists know that the Y chromosome is essential for male fertility, but which genes are the most important and how they work is less clear till now.

In research published in Science, a research team at the Crick resolved this question by generating 13 different mouse models, each with different Y genes removed, and investigated their fertility.

The researchers studied the ability of these adult mice to reproduce, including looking at the number of offspring, number of sperm produced and the appearance and motility of the sperm.

They found that several Y genes were critical for reproduction. If these genes were removed, the mice couldn't produce young, due to absence or reduced number of sperm, failure to produce a reservoir of sperm stem cells or abnormal sperm shape or movement.

Interestingly, some other genes had no impact when removed individually, but did lead to the production of abnormal sperm when removed together.

This was the case for a group of three genes which model a region of the chromosome called AZFa in humans. AZFa deletions are a common cause of the most severe cases of male infertility, but it has been hard to tell which genes in the region are responsible.

The results suggest that many Y genes play a role in fertility and can compensate for each other if one gene is lost. This also means that some cases of infertility likely result from multiple genes being deleted at the same time.

As well as regulating sperm generation, some Y genes are also active in other organs, like the heart and the brain, where they may be very important. Also, as they age, some men can lose their Y chromosomes in blood due to errors in cell division. 

This loss is associated with conditions like Alzheimer's disease or cancer, so the lab is now aiming to understand what happens in other organs in the mice with Y gene deletions.

Infertility is a big problem, with one in six couples struggling to conceive. In a significant proportion of cases,genetic factors, particularly those involving the Y chromosome, are the cause.

Now that scientists have shed light on the Y genes, it will be important to start sequencing the Y chromosome in more individuals, to potentially uncover unexplained causes of male infertility. With more research, we may be able to one day replace missing genes in the cells that make sperm to help couples have children through IVF.

Jeremie Subrini et al, Systematic identification of Y-chromosome gene functions in mouse spermatogenesis, Science (2025). DOI: 10.1126/science.ads6495. www.science.org/doi/10.1126/science.ads6495

Comment by Dr. Krishna Kumari Challa on Thursday

Insulin-producing cells avoid immune attack

Gene-edited insulin-producing beta cells have survived for a month after being injected into a man with type 1 di.... These tweaked cells have a protein called CD47 on their surface, which tells the immune system not to destroy them. Only a small number of cells were injected into the man’s arm, but they have produced insulin and avoided his immune system’s crosshairs so far, suggesting that they could become an effective treatment for diabetes.

https://ir.sana.com/news-releases/news-release-details/sana-biotech...

https://www.newscientist.com/article/2463508-gene-edited-cells-that...

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