Modern Humans Came From at Least 2 Ancestral Populations

By analyzing the genome sequences, researchers found that modern humans are the result of 2 populations that diverged 1.5 million years ago. It has long been believed that Homo sapiens first appeared 2-300,000 years ago from a single lineage. The latest results reveal that once the 2 populations diverged, they came back together in an admixture event around 300 thousand years ago, in a ratio of 80:20%. This data shows a strong bottleneck in the major ancestor, while the minority correlates to distance to coding sequence, suggesting a deleterious effect on the majority population. Interbreeding and genetic exchange has long played a major role in the emergence of new species across the animal kingdom.

Sources:

 https://www.nature.com/articles/s41588-025-02117-1 

https://www.sciencedaily.com/releases/2025/03/250318141412.htm

Is Acne influenced by Genetics?

    Acne is influenced by both genetics and lifestyle choices, but lifestyle alone cannot always override a strong genetic predisposition. Genetics can affect factors such as oil production, pore clogging, hormone sensitivity, and inflammation, making some people more prone to acne regardless of how healthy they eat or how consistent their skincare routine is. Acne is considered polygenic, meaning many genes contribute to its development. For example, genes involving androgen receptors (AR) can influence how strongly the skin responds to testosterone; increased sensitivity can lead to higher sebum production. Inflammatory genes such as TLR2 and TLR4 recognize acne-related bacteria, and variations in these genes can affect how strong the inflammatory response will be. Genes involved in keratinization also play a role in how severe acne may become by influencing pore blockage.

This does not mean maintaining a healthy lifestyle is pointless. Factors such as a balanced diet, stress management, and proper skincare products can help reduce breakouts and keep acne much more manageable, especially in mild cases. However, for severe acne, such as cystic acne, medical treatments may be necessary. Treatments such as benzoyl peroxide, doxycycline, and isotretinoin can be considered. Isotretinoin (formerly known as Accutane), one of the most effective and widely used treatments, is often prescribed when genetics strongly drive acne. It works by dramatically shrinking oil glands, reducing sebum production so pores are less likely to become clogged. In short, lifestyle choices can help manage acne, but they may not fully overcome strong genetic factors.

Link:  https://biologyinsights.com/is-acne-inherited-from-your-mother-or-father/

Additonal Link: https://www.minarsdermatology.com/acne-and-genetics/

Creature that Breaks Codon Rules

 A microbe was discovered that used the codon UAG as a stop codon and as a code for the amino acid pyrrolysine. Pyrrolysine, found in archaea and bacteria, is required for methylamine-mediated methanogenesis, a form of anaerobic respiration. Typically, ambiguity in the code of DNA is deleterious, but with this microbe, it has created a new feature. This microbe has broken one of the fundamental rules of genetics, and biology as a whole, that each codon only has one meaning. The way that it is decided whether UAG will create the amino acid or to use it as a stop codon is seemingly random. The biggest connection that was found is that when less of the amino acid was around the cell, UAG more often acted as a stop codon. This study has created many questions around ways cells interpret stop codons, and if scientists have the ability to control them.

Sources:

https://www.pnas.org/doi/10.1073/pnas.2517473122 

https://www.aol.com/lifestyle/scientists-discovered-creature-breaks-fundamental-130000934.html

genetics plays a significant role in intelligence

  Intelligence is influenced by both genetics and environment, with genetic factors playing a significant role. It highlights that intelligence is shaped by many genes rather than by a single one, and that genetic influence tends to increase with age. The article also notes that genes can influence the environments people experience, such as their interests and learning opportunities, and that intelligence is linked to other traits, such as memory and problem-solving ability. It shows that intelligence is complex and results from the interaction between biological and environmental factors.

link: https://pmc.ncbi.nlm.nih.gov/articles/PMC4270739/

#genetics #intelligence 

Advancements in Skin Scarring Genetics

The highly complex process of wound healing requires the coordinated response of various cell types, as well as the proper delivery of nutrients and oxygen to repair the damaged tissue. While superficial wounds tend to heal within a matter of days, deeper and larger wounds tend to heal by leaving a scar. These scars can be painful, restrict mobility, or impair function.

A recent review calls attention to the need for improved techniques or developments to both treat and prevent scarring. Research could be improved with the use of population health approaches and experimental validation in animal models. In the past, a wide variety of animal models have been used to study scaring. It is possible to take these studies further with the performance of candidate gene validation. Overall, these strategies may uncover links between specific genetic loci and wound related phenotypes in humans. Future experimental work in animal models can then be used to validate these candidate genes and deepen insight into the biological mechanisms involved.




Source:
https://www.sciencedirect.com/science/article/pii/S1748681525006588#sec0030

Additional:

https://pmc.ncbi.nlm.nih.gov/articles/PMC10843200/

One Genetic Map Could Change How We Understand Mental Health

  

  A groundbreaking study published in Nature analyzed genetic data from over 6 million people to better understand how different mental health disorders are connected. Researchers found that conditions like depression, anxiety, schizophrenia, ADHD, and substance use disorders are not as separate as we once thought. Instead, they share underlying genetic patterns that group into five major clusters, such as neurodevelopmental disorders and internalizing disorders.

    This discovery helps explain why many individuals experience multiple mental health conditions at the same time. Rather than being completely distinct illnesses, these disorders may stem from shared biological pathways influenced by hundreds of genetic variants. The study even links certain disorders to specific brain cell types, offering deeper insight into how these conditions develop at a cellular level.

    What makes this research especially important is its potential to reshape how mental illness is diagnosed and treated. Currently, diagnoses are based mostly on symptoms, but this genetic approach could lead to a more accurate, biology-based system. In the future, treatments might target shared genetic mechanisms, helping multiple conditions at once instead of treating them separately.

    I found this study fascinating because it challenges the way we traditionally think about mental health. It shows that mental illness is far more interconnected and complex than simple labels suggest. This kind of research could reduce stigma and lead to more effective, personalized care, which feels especially important as mental health continues to impact so many people.

Article link: https://stories.tamu.edu/news/2026/01/12/one-genetic-map-could-rewrite-how-we-understand-mental-health/

Additional resource: https://www.nature.com/articles/s41586-025-09820-3

Genetic Components Linked to Neuropathy

In a recent study examining the causes of motor and sensory neuropathy, researchers have located a gene that has the potential to cause it. 

Neuropathy is a condition in which the peripheral nerves are damaged and can cause numbness and tingling, pain and weakness. This usually occurs in the outermost parts of the body but can also go up the individual's arms and legs. Due to this condition’s potential to severely limit mobility, neuropathy can be extremely debilitating and life altering.

In this study, researchers identified a missense mutation in a gene regulating nicotinamide phosphoribosyl transferase, an enzyme that regulates DNA repair and metabolic processes. Both in human individuals homozygous for the mutation and in mouse models, the missense mutation in the NAMPT gene disrupted metabolic processes and caused neuropathy. This study marks the first human neurological disease caused by a mutation in the NAMPT gene.

This research is very important because of how difficult it is to effectively treat neuropathy in many cases. By finding a genetic component to this disease, researchers in the medical field may also find new ways to treat it.

Sources:

https://www.science.org/doi/10.1126/sciadv.adx2407

https://pubmed.ncbi.nlm.nih.gov/28333140/

Genetic Influence on Oral Health

Carmine Martino

BIOL-2110-001

Dr. Guy Barbato

April 25th, 2026

    A recent study found that human genetics can influence the oral microbiome and may increase the risk of dental caries, like decay in some people. Scientists analyzed saliva-derived DNA from more than 12,500 individuals and measured the levels of 439 common microbial species found in the mouth.

    The findings showed a surprisingly large effect of human genetics on the abundance of microbes in the mouth. The team identified 11 regions of the human genome associated with differences in the levels of dozens of bacterial species. One gene called AMY1 was strongly linked to the composition of the oral microbiome and even denture use, suggesting that interactions between human genes and oral bacteria may play a role in dental health. The strongest relationship found was between a genetic variant that disrupts the FUT2 gene and the levels of 58 oral bacterial species. The article explains that these findings show a strong interaction between human DNA and the DNA of bacteria living in the mouth.

    I particularly enjoyed reading about this topic because I used to work as a dental assistant, and I would sometimes notice family member's of patients coming in with similar oral health problems even when they seemed to have good home care habits. Reading about how genetics can play a role in a patient's oral health made those experiences make more sense to me.

Article: 

https://medicalxpress.com/news/2026-01-genes-microbes-mouths-dental-health.html

Second Source:

https://www.frontiersin.org/journals/dental-medicine/articles/10.3389/fdmed.2022.1060177/full