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According to Purdue University's College of Agriculture, researchers discovered that the circadian clock has an unexpected function in age-related alterations in the retina.
A biological clock is an organism's inherent time-keeping mechanism that regulates its circadian rhythm cycle. They are made up of specialized molecules (proteins) that interact with the body's cells. Biological clocks may be found in almost every tissue and organ. Similar genes that manufacture the clocks' molecular components have been discovered in people, fruit flies, mice, plants, fungus, and various other creatures.
Circadian rhythms are 24-hour cycles that determine physical, mental, and behavioral changes in humans. The sleep-wake cycle, hormone production, cardiovascular health, glucose homeostasis, and body temperature control all rely on the circadian timing system, also known as the circadian clock. The circadian clock is important for many biological processes; the widespread use of television, the internet, and mobile phones for almost 24 hours a day has gradually reduced adequate sleeping time. According to a recent study, long-term circadian disturbances have been linked to various pathological illnesses, including early mortality, obesity, poor glucose tolerance, diabetes, mental disorders, retinal degradation, depression, and cancer development.
To understand circadian rhythms, scientists examine people and creatures with comparable biological clock genes, such as fruit flies and mice. The light and dark intervals in these tests are changed to control the subject's surroundings. The researchers then search for changes in gene activity or other biological markers. Scientists also look at species with erratic circadian rhythms to see whether genetic components of biological clocks are malfunctioning.
Most living things, including animals, plants, and bacteria, are affected by these natural processes, which are predominantly affected by light and dark. Sleeping at night and being awake during the day is an example of a light-related circadian rhythm. Every day, the delicate membranes of human eyes are broken down by light, and vital portions are rebuilt during the darkness of night. This process is controlled by our circadian rhythmic clock, and researchers have discovered that if the clock is interrupted, our eyes are more likely to develop retinal degeneration as we age.
According to Purdue University's College of Agriculture, researchers discovered that the circadian clock has an unexpected function in age-related alterations in the retina. "Imagine if we could slow or prevent vision loss from retinal degeneration," Vikki Weake, associate professor of biochemistry in the college, said in a university news release. To do so, Weake adds, the team must first comprehend the molecular mechanisms that drive age-related changes, as well as the environmental and internal factors that impact them. She mentioned that the circadian clock may be crucial in maintaining eye health and preventing retinal degeneration during old age.
The scientists analyzed the eyes of Drosophila flies, a typical model for the human eye. The study was unique in that it used numerous time periods during aging, focused on photoreceptor neurons, and used novel data processing techniques. The scientists were able to identify some of the transcription factors that drove the gene expression variations in the aging eye by considering changes in chromatin that affect access to the underlying DNA through the aging process. "In our earlier studies, just focusing on gene expression, we were missing part of the story," Weake said in the university news release.
"I came across a powerful bioinformatics technique that can identify changes in transcription factor activity, helping us to understand gene regulation," Jauregui-Lozano said in the university release. The findings of the study demonstrated that the transcription factors—Clock and Cycle, which play a role in circadian rhythm—exhibit gradual changes in activity as people become older, which is consistent with prior knowledge about eye biology. The impartial approach led the team to select Clock and Cycle as promising research methods. The diffTF approach, according to the researchers, looks at variations in DNA accessibility in chromatin across various situations. In contrast to research teams starting with a target gene in mind, it creates a panel of prospective possibilities to explore.
Weake further stated that controlling the timing at which these proteins are produced is critical for protecting light-sensing neurons and maintaining vision. "The proteins involved in light-sensing are fragile, and when exposed to light during the day, they decay," she added in the press statement. It is an issue if the circadian clock is off and these proteins are not generated at the proper moment.
According to the university, co-author Hana Hall, a research assistant professor of biochemistry at Purdue, conducted light and dark studies to see the influence on gene transcription when she was a researcher in Weake’s lab. Neurons, unlike most other cells in the human body, do not divide or multiply. According to Hall, degenerative illness is caused by the loss of neurons. As a result, the cellular mechanisms involved in their repair and regulation are very crucial.
The onset of retinal diseases can be prevented or reduced if scientists can determine the mechanics of how things get misregulated in an organism’s older years. Visual impairment has an impact on a person's life expectancy, independence, and quality of life. Even a five-year delay in onset might have a huge effect.
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