Soumya Shraddhya Paul, Amity University Noida
Epigenetic changes in simple terms refer to an external stimulus that affects the way the gene works or functions. Epigenetic changes are different from genetic changes as these are reversible and do not alter the DNA sequences, it only alters how the body is going to read the DNA sequences. Usually when an organism mates it tends to share its genetic information, trying to make a replica of itself but it has been noted recently that epigenetic changes can also produce some active changes like maintenance and repair through positive and negative feedback respectively and can also cause passive dilution. Stable epigenetic changes have also been observed in various organisms that remain unchanged for hundreds of generations. E.g. Protein folding in wild Saccharomyces can persist for many generations; each of these changes is often time linked with a positive feedback mechanism. It is also important to note here that positive feedback alone won’t be able to bring stability to epigenetic changes throughout the generations. To understand more about epigenetic changes, scientists started studying more characters using mating.
Brief About the Study
To understand more about this study scientists from the University of Maryland introduce mating as a simple approach to reproducibly provoke RNA silencing of a single-copy transgene which can be prevalent for hundreds of generations. A minimal mixture of cis-regulatory sequences from this transgene can assist such stable alternate within the C. elegans germline. Genes that share subsets of those regulatory sequences may be silenced for some generations, however in the end recover from and even turn out to be resistant to a few styles of RNA silencing. As a consequence, the outcomes establish or show a paradigm for reading the regulatory differences that determine persistent epigenetic alternate versus epigenetic recuperation.
Results
Through this study, the scientists were able to find out while breeding nematode worms some of them lead to epigenetic changes which were visible in all the generations up till the scientists were able to breed these nematodes. To understand this phenomenon even more the scientists made the nematode carry a fluorescent tag gene either the male or the female was going to carry it, after attaching the gene the breeding process took place and it was noted that whenever the female (mother) carried the fluorescent gene the offspring always glowed, but when the male (father) carried it the offspring glowed very faintly or didn’t glow at all. This was the opposite of what was thought before, as the scientist believed no matter which parent carried the gene the offspring is always going to glow. It was also noted that when the slicing signal wins the gene is stopped for the rest of the generation, but slicing didn’t always win but rather won occasionally.
Conclusion
Through this study, we understood the importance of epigenetic genes and how they can play a huge role in the inheritance of traits and expressions. Further studies and research will be needed to fully understand the basics of this. But as of now, we can say external factors play a huge role in the expression of traits and how DNA will be read.
Also read: The emergence of the Kappa variant of SARS-CoV-2
Source:
- Devanapally, S., Raman, P., Chey, M., Allgood, S., Ettefa, F., Diop, M., Lin, Y., Cho, Y. E., & Jose, A. M. (2021). Mating can initiate stable RNA silencing that overcomes epigenetic recovery. Nature Communications, 12(1), 4239. https://doi.org/10.1038/s41467-021-24053-4
- Match matters: The right combination of parents can turn a gene off indefinitely: https://phys.org/news/2021-07-combination-parents-gene-indefinitely.html
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About the author: Soumya Shraddhya Paul is an undergrad biotechnology student who worked in building 3D prosthetics in Base Hospital Delhi Cantt, and holds a key interest in nutraceuticals and enzymology.
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