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According to our new research, sequencing human DNA from small amounts of water, sand and air in the environment has the potential to extract identifiable information such as genetic lineage, gender and health risks.
Every cell in the body contains DNA. DNA can be used to identify individuals because each person has a unique genetic code. Healthcare professionals and researchers typically obtain human DNA through direct sampling such as blood tests, swabs, or biopsies. However, all living things, including animals, plants and microbes, shed DNA all the time. Water, soil, and even air contain microscopic particles of biological material of living origin.
DNA that an organism has shed into the environment is known as environmental DNA or eDNA. Over the past decades, scientists have been able to collect and sequence eDNA from soil and water samples to monitor biodiversity, wildlife populations, and disease-causing agents. Tracking rare or elusive and endangered species via eDNA has been a boon to researchers, as traditional surveillance methods such as observation and trapping are difficult, often unsuccessful, and prone to invading the species of interest. I’m here.
Researchers using eDNA tools typically focus only on the species they are studying and ignore the DNA of other species. But humans also excrete her DNA, coughing up and flushing it out into the surrounding environment. And, as our team of geneticists, ecologists and marine biologists at the University of Florida’s Duffy Lab discovered, traces of human life can be found everywhere except in the most isolated places. .
Animals, Humans, and Viruses in eDNA
Our team uses environmental DNA to study endangered sea turtles and the viral tumors to which sea turtles are prone. Newly hatched tiny sea turtles release their DNA as they crawl along the beach on their way to the ocean. Sand skimmed from footprints contains enough DNA to gain valuable insight into turtles and the herpes keronitis and fibropapillomatosis tumors that plague turtles. A liter cup of water from a convalescent turtle tank under veterinary care provides similarly rich genetic information for research. Unlike blood or skin sampling, eDNA collection does not stress the animal.
The gene sequencing technology used to decode DNA has advanced rapidly in recent years, making it easy to sequence the DNA of any organism in environmental samples. Our team suspected that the sand and water samples they were using to study sea turtles might, of course, contain DNA from many other species, including humans. What we didn’t know was how beneficial her human DNA could be to extract.
To find out, we took samples from different locations in Florida. This includes the sands of urban and rural seas and rivers, secluded beaches and remote islands not normally visited by humans. Human DNA was found in all but the remote islands, and these samples were of high enough quality for analysis and sequencing.
We also tested the technology in Ireland, where a river meandered from a remote mountaintop, through a small rural village, and into a large town of 13,000 people into the sea. Human DNA has been found everywhere except in remote mountain tributaries where rivers begin, far from human habitation.
We also collected an air sample from a room at a wildlife hospital in Florida. The people in the room allowed me to take samples from the air. We recovered DNA that matched human, animal patients, and common animal viruses present at the time of collection.
Surprisingly, the human eDNA found in the local environment was complete enough to identify disease-associated mutations and to identify the genetic ancestry of people living in the area. Sequencing the DNA left by the volunteers in the sand footprints also revealed part of the sex chromosome.
Ethical implications of human eDNA collection
Our team calls the inadvertent removal of human DNA from environmental samples “human genetic bycatch”. We want a deeper discussion on how to ethically treat human environmental DNA.
Human eDNA has the potential to greatly advance research in fields as diverse as conservation, epidemiology, forensics, and agriculture. Done right, human eDNA can help archaeologists track undiscovered ancient human settlements, biologists monitor cancer mutations in specific populations, and provide useful forensic information to law enforcement. It helps to provide
However, there are also myriad ethical implications associated with the inadvertent or deliberate collection and analysis of human gene bycatch. Identifiable information can be extracted from eDNA, but accessing this level of detail about individuals or groups comes with responsibilities of consent and confidentiality.
We conducted our research with Institutional Review Board approval, which ensures that research involving human subjects complies with ethical research guidelines, but we do not believe that anyone should be using this type of information ethically. There is no guarantee that it will be treated appropriately.
Many questions arise about human environmental DNA. For example, who has access to human eDNA sequences? Should this information be made publicly available? Is consent required before taking human eDNA samples, and from whom? should human genetic information be removed from samples originally collected to identify other species?
We believe it is important to put regulations in place to ensure that data collection, analysis and storage are conducted ethically and appropriately. Policy makers, the scientific community, and other stakeholders must take human eDNA collection seriously and balance consent and privacy with the potential benefits of eDNA research. Raising these questions now will allow everyone to be aware of the function of her eDNA, and will help guide the development of protocols and regulations to ensure the proper use of eDNA technology and the ethical handling of human gene bycatch. You can spend more time developing.
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