Screwworm Returns, and What is Being Done to Fight it.

 This past summer, an article was published in the New York Times detailing the re arrival of screwworm in the United States. Screwworm, largely eradicated in the 1970s in the United States, has made a reappearance due to breaching a barrier in Panama, sparking concern from both the U.S. and Mexico. The parasite is a flesh eating maggot that feasts on the open wounds of animals. It affects mostly livestock, but can also spread to other animals including deer, rabbits, and even humans.

  

The issue is, this problem had already been solved before. In the 1950s, it was discovered that scientists could create sterile male screwworm flies and release them into areas that contained massive amounts of screwworm. This would severely decrease the population as the females would mate with the sterile males, thus decimating the population. A barrier was created and maintained from 2006 onward, until 2022 where said barrier was somehow broken through, causing screwworm to start to make its way back into Central and North America. This means that these companies that were making the sterile flies will need to heavily ramp up production to drive down the population of these invaders and send them away for good. To me, this article highlights that safety and attention to detail that is needed to work in the field of science. If something like this can happen once, there is nothing stopping it from happening again. We need to ensure that  careful attention is payed to everything, so that something like this, or worse, doesn't happen again.

Cannabis Dependence and the Science Behind it

 This paper takes a close look at why some people are more at risk for cannabis dependence than others, and a big part of the story comes down to genetics. According to the article, cannabis is one of the most commonly used drugs worldwide, but only a portion of users end up developing dependence. The paper points out that global use ranges from about 2.8% to 5.1%, and men consistently show higher rates than women. It also explains that dependence isn’t just about using cannabis often, it’s about having a strong internal drive to keep using it, even when it causes problems.

The researchers report that cannabis dependence is partly inherited, with genetics accounting for about 55% of the overall risk. In the paper, they highlight 14 specific genes that seem most tied to cannabis dependence, including ANKFN1, CHRNA2, and NCAM1. These genes are connected to brain signaling and neural functioning, which makes sense given that cannabis affects the brain’s reward systems. The authors also mention several “candidate genes,” like CNR1 and ABCB1, that might influence how the body responds to cannabinoids, though they note the evidence for some of these is still being sorted out.

Even with all of these genetic clues, the paper makes it clear that genes aren’t destiny. Environmental factors, personal experiences, stress, mental health, and even how early someone starts using cannabis all play a role. The authors suggest that future work should look not only at DNA itself but epigenetic changes, basically, how gene activity gets switched on or off, to better understand why dependence develops in some people and not others. It’s a reminder that cannabis dependence is complicated, and genetics are just one piece of the puzzle.

Original Article: https://psychpersonality.com.ua/en/journals/tom-24-2-2023/genetika-zalezhnosti-vid-kanabisu

Secondary Article: https://link.springer.com/article/10.1186/s12920-021-01035-5?utm_source=chatgpt.com

Labels: "Cannabis" "Addiction" "Inheritability" 

Findings point to path forward for treatment of rare genetic disease

Friedreich’s ataxia is one of those rare disorders that most people don’t hear about, but it’s incredibly serious for the families affected by it. It causes muscle weakness, nerve damage, and major problems with coordination — and the hardest part is that there’s currently no real treatment that stops the disease from getting worse. That’s why this new research from the Broad Institute immediately caught my attention.

The scientists discovered a potential way to work around the genetic defect instead of trying to fix it directly. In Friedreich’s ataxia, the body loses a protein called frataxin, which the mitochondria need to make energy. Without enough frataxin, the cells basically struggle to function. What the researchers did was run genetic screens to find other genes that could “compensate” for that loss. Surprisingly, they found a couple of proteins, especially FDX2 and NFS1, that, when adjusted, helped cells overcome the frataxin shortage.

What I really liked about this study is that it opens the door to treatments that don’t rely only on CRISPR or gene therapy. Instead, these new findings suggest that traditional drugs could target these alternative pathways and still have a big impact on symptoms. In animal models, boosting these proteins actually improved the disease features, which feels like a huge step forward considering how limited current treatment options are.

Genetics of Spina Bifida

 

This review is about spina bifida (SB) as a complex congenital disorder of the central nervous system, emphasizing its significant genetic component alongside environmental factors. The authors detail that while the complete cause is not fully understood, research has identified over 250 associated genes in mouse models, pointing to disrupted pathways like the planar cell polarity (PCP) pathway, signaling, and folate metabolism. In humans, SB is considered an omnigenic trait, involving a combination of variants in genes such as VANGL1, VANGL2, CELSR1, and TBXT, as well as genes involved in folate processing like MTHFR. The review also covers the critical role of maternal factors (diabetes, folate deficiency) and the well-established preventive effect of folic acid supplementation. Beyond genetics, the article discusses the pathophysiology of the "two-hit" injury model and the evolution of treatment from postnatal surgical closure to groundbreaking fetal surgery, culminating in the introduction of the first FDA-approved clinical trial using placenta-derived mesenchymal stem cells (PMSCs) to augment in utero repair.

In my opinion, this research paper powerfully illustrates the convergence of genetic discovery and clinical innovation in tackling a devastating birth defect. The genetic narrative is particularly compelling; it moves SB from a condition historically attributed to simple folate deficiency or birth injury to a complex neurogenetic disorder with an "omnigenic" architecture. Understanding that hundreds of genes can disrupt fundamental embryological processes like neural tube closure reframes our approach, shifting focus from a singular cause to a web of vulnerabilities. This genetic complexity explains why folic acid, while hugely preventive, is not a universal cure. The most exciting implication lies in the therapeutic frontier: this genetic understanding lays the groundwork for the pioneering stem cell trial discussed. By identifying the specific cellular and signaling pathways that fail, researchers can now rationally design regenerative strategies, like using PMSCs, to protect or repair the developing spinal cord. This marks a paradigm shift from merely closing a physical defect to attempting a biologically-informed restoration of function, offering real hope for improving outcomes beyond the current limits of fetal surgery alone.

References: 

1. Hassan, A.-E. S., Du, Y. L., Lee, S. Y., Wang, A., & Farmer, D. L. (2022). Spina Bifida: A Review of the Genetics, Pathophysiology and Emerging Cellular Therapies. Journal of Developmental Biology, 10(2), 22. https://doi.org/10.3390/jdb10020022 

2. Spina bifida: MedlinePlus Genetics. (n.d.). Medlineplus.gov. https://medlineplus.gov/genetics/condition/spina-bifida/ 

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Neuron zapping help us understand Parkinson's

    Scientists at Johns Hopkins Medicine have taken an important step toward watching neurons communicate in real time. Using a clever “zap-and-freeze” approach, the research team was able to stop brain tissue—first in mice, then in human, at the exact moment one neuron sends a message to the next. Their findings, published in Neuron, give a rare glimpse into the split-second events at the synapse, the junction where most forms of Parkinson’s disease are thought to originate. Because synaptic disruptions drive the majority of Parkinson’s cases, being able to capture this process as it unfolds could bring researchers closer to understanding how communication starts to break down.

                       

    To test the method, the team stimulated neurons with a tiny electrical pulse and immediately froze the tissue, preserving every structure for analysis. Remarkably, samples taken from patients undergoing epilepsy surgery showed the same rapid recycling of synaptic vesicles that appeared in mice—including the presence of Dynamin1xA, a protein that enables ultrafast membrane recovery. This parallel between species reinforces the value of mouse models for human brain research. The researchers now hope to use zap-and-freeze on tissue from individuals with Parkinson’s disease, with the goal of pinpointing exactly how these shift in affected neurons and ultimately guiding new ideas.

Explanation on why modern Chinese cats are similar to cats from the west rather than native cats to China

     Researchers found that DNA samples from fossils in China recognized that early cats in ancient China weren't actually the housecats we think of today. The DNA found was dated about 5,400 years ago which shown that small cats living around early farming settlements were wild leopard cats not domestic house cats. These wild cats lived in close proximity to humans and likely hunted rodents attracted to stored crops but they weren't the species we keep as pets today. 

    True domestic house cats arrived much later. They descended from the Near Eastern African wildcat which only appeared in China during the Tang dynasty AD 700-900. Analysis of remains from that period shows genetics signatures linking them to cats from Central Asia suggesting they came from trade networks like the Silk Road. 

    For over 3,500 years humans and leopard cats coexisted in ancient China, but these wild felines didn't become domesticated in the same way the African bobcat did. This helps explain why modern Chinese cats are genetically similar to cats from the West rather than to native Chinese wild cats. 

Sources:

Brookshire, B. (2025, December 3). Ancient DNA reveals China’s first “pet” cat wasn’t the house cat. Science News. https://www.sciencenews.org/article/dna-china-first-cat-leopard-rodent

MSN. (n.d.-b). https://www.msn.com/en-us/pets-and-animals/cats/ancient-dna-says-china-s-first-pet-cat-wasn-t-the-house-cat/ar-AA1RQQ8u

    

Parts of Our DNA Evolve Faster Than We Thought

 A recent study using advanced sequencing technologies has revealed that some regions of the human genome mutate much faster than scientists previously understood. By analyzing genomes across multiple generations in the same family, researchers detected nearly 200 new genetic changes per person and found that certain “mutation hotspot” regions change at a high rate, almost every generation. 

This discovery is significant because a clearer picture of how and where mutations occur can help scientists predict genetic disease risk and better understand human evolution. Regions with high mutation rates might explain why some diseases appear spontaneously in children even when parents don’t carry the variant, refining genetic counseling and diagnostic strategies. 

Linking mutation rates with improved diagnostics is particularly timely. A new blood test presented at a recent genetics conference can now rapidly analyze proteins tied to more than 8,000 disease-related genes, enabling much faster diagnosis of rare genetic disorders. This kind of technology could make it easier to detect conditions tied to mutations in both common and rapidly evolving regions of DNA. 

Together, these advances show how research into genetic mutation dynamics and better testing tools are beginning to close the gap between DNA sequence variation and real-world health outcomes.

Main Article: https://www.sciencedaily.com/releases/2025/04/250423111908.htm

2nd Article: https://medicalxpress.com/news/2025-05-blood-enables-rapid-diagnosis-thousands.html

Bringing the Dire Wolf to Modern Times

 An article from 9 months ago from the New York Times highlights the process of de-extinction, and the efforts of a team of scientists to attempt to bring back the dire wolf species. Basically, DNA was extracted from the fossils of dire wolves, which was then studied. The scientists were able to edit 20 genes of gray wolves to have the distinct features that they discovered in the dire wolves. Embryos were then created of these new wolves and implanted in a surrogate mother, who then gave birth to three healthy wolves. These wolves are bigger than the average gray wolf and have a dense fur coat, both traits that belonged to dire wolves. The experiment is considered a success, and while these particular wolves remain in captivity, these scientists believe that the technology that was used and developed in this experiment could be used to help preserve endangered species today. They believe that they can make copies of endangered species and release them to the wild to help improve genetic diversity and help increase the species's numbers.

 

 

 Of course, these animals aren't going to ever actually be dire wolves, just animals that are coded to look like them. Bringing back an animal from extinction is an impossible task, however the animals that can be de-extinct can offer a unique perspective into what life looked like on this planet thousands of years ago. Also, if this technology can actually be used to help save animals from extinction and this is just the start, then there seems to be a bright future ahead of this planet's biodiversity.