symbiotic – BioQuakes

How Do Ancient Viruses Still Impact Humans?

On October 20, 2022

When one thinks of the similarities between modern and ancient humans, one will probably think of the basic genetic material that determines our physical structure. However, what is not so obvious are the viruses that infected them yet remain in our genes. It is known that DNA containing these ancient viruses make up about eight percent of the human genome (Ancient Viruses). These viruses have previously been believed to be insignificant, however, recent research has disproved this theory.

The viruses that have been genetically passed down are known as retroviruses. Retroviruses spread by making copies of themselves through the production of RNA which contains instructions for its DNA and replication. This reproduction process, called transcription, is similar to that which is done in the nucleus of eukaryotic cells. However, in this case, the synthesized DNA is then placed in the DNA of the cell it occupies. With that in mind, For the genes containing these viruses (or any gene) to be activated, they must contain specialized RNA with the information for its reproduction and it must be revealed by a protein called the transcription factor.

Using data from the Genotype-Tissue and Expression project, scientists Aidan Burn, Farrah Roy, Michael Freeman, and John M. Coffin searched for these active virus genomes in healthy tissue. They specifically sought out HML-2 which is a relatively new virus. They also looked for the RNA which would indicate its activation. This virus was found in all of the tissue they examined and they found the highest activity of it in the cerebellum.

Though they were once harmful to humans, these viruses found within healthy cells and tissues no longer serve as functioning viruses. They are now known as Endogenous Retroviruses (ERV). They cannot infect, but rather they serve us in our immune system. Their activation has been shown to have a vital role in embryonic development and aid in the detection of cancer.

I found the origination of ERV in human genomes to be similar to that of mitochondria and chloroplasts’ origin in eukaryotic cells. It is likely that mitochondria and Chloroplasts were engulfed by bacteria cells and are now able to carry out their functions (reproduction) within them while also benefiting the cell (providing it with ATP). Similarly, at some point during human evolution, the virus entered humans and was then able to utilize its environment (the host cell) to reproduce. I would also describe the relationship between ERV and modern-day humans as symbiotic due to the recent research which has revealed their benefits.

Discovering and Using Your Personal, Biological, Tiny Army

By jednetic

On November 14, 2019

In Student Post

Bacteria is an important part of our biology, so important that we are essentially 99% bacteria. A lot of this bacteria is part of the human gut microbiome. This topic has been picking up interest in the field of biology, and have shown linkage to many diseases such as inflammatory bowel disease and obesity. Not only do the bacteria in our gut play a role in preventing these diseases, but their symbiotic relationship helps us maintain metabolic functions.

This is a depiction of the numerous types of bacteria in our microbiome.

Until recently we were unable to study these bacteria due to our inability to cultivate them in a lab; however, due to new advancements in sequencing technology we can now see how big of role they play in our biology and our functions. These bacteria are “estimated to harbor 50- to 100-fold more genes, compared to the hose. These extra genes have added various type of enzymatic proteins which were non-encoded by the host, and play a critical role in facilitating host metabolism.” For example, gut microbiata is very important in fermenting unabsorbed starches. These bacteria also aid in the production of ATP. A certain type of bacteria generates about 70% of ATP for the colon with a substance called butyrate as the fuel.

This image shows the interaction between the gut and the immune system. The immune system targets bacteria, but somehow not our gut bacteria.

Another large role of the gut microbiome is its interactions with out immune system and nervous system. The bacteria in our gut suppress the inflammatory response in order to not be targeted by the immune system. This allows for a symbiotic relationship between us and the bacteria inside of us. This allows the gut bacteria to help regulate the inflammatory response without being stopped by the very thing it’s regulating. Without these bacteria our inflammatory responses would be completely out of the ordinary.

These findings with gut bacteria are fairly new and there is much more to come regarding their use in the field of medicine. Something to think about that I found fun was how little of us is really human. Ninety nine percent of you is bacteria, which essentially means that we are pretty much just giant colonies of bacteria. Kind of gross/amazing when you think about it.

What are Biofilms?

By xraychristollography

On November 19, 2018

In Student Post

Biofilm being formed. (Pixnio)

Medicine has made great advancements in patient care and treatment over the last decade. However, everyday viruses and bacteria alike have become stronger and more resilient – even to the latest antibiotics. One such threat that has led to “…thousands of deaths…” in “…American Hospitals alone…” are biofilms. These bacterial cells “…gather [together] and develop structures that bond them in a gooey substance…” insulating them from the outside world. Biofilms ability to become impervious to antibiotics at a moment’s notice has led biologists to wonder both how they develop, and how to stop them.

To find out how and why these bacteria form biofilms, researchers at the Levchenko Lab, at Yale University, as well as from the University of California – San Diego, “…designed and built microfluidic devices and novel gels that housed uropathogenic E. coli cells, which are often the cause of urinary tract infections. These devices mimicked the environment inside human cells that host the invading bacteria during infections.” From this experiment, the scientist discovered that the bacteria would multiply until physical constraints inhibited them from further reproduction. At this point, the bacteria would become “stressed” and thus this “stress would induce the formation of a biofilm.

With the numerous mimicking devices that the researchers utilized in the experiment, they can now create many biofilms in predictable ways, and further analyze their behavior in similar environments. “This would allow for screening drugs that could potentially breach the protective layer of the biofilms and break it down.” It is an amazing solution to a stubborn and persistent biological threat, that has already robbed enough, otherwise healthy, people of their lives.

It is imperative that we continue to make great strides in the advancement of medical technologies and treatments, as this will enable us to live healthier, more disease-free lives for the future to come. As viruses and bacteria get stronger, we need to make sure to keep up.

BioQuakes

AP Biology class blog for discussing current research in Biology

Tag: symbiotic

How Do Ancient Viruses Still Impact Humans?

Discovering and Using Your Personal, Biological, Tiny Army

What are Biofilms?

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