Using chemical ecosystem selection (CES) techniques we are searching for emergence of evolution-like dynamics and autocatalysis in complex "prebiotic soups" - mixtures of compounds likely present on early Earth. CES involves recursive transfers-with-dilution and allows us to monitor changes in chemical composition over multiple generations. I conducted several experiments of this type, processed using untargeted metabolomics workflows with liquid chromatography-mass spectrometry (LCMS). To asses chemical diversity, I analyze LCMS data with methods used in organismal ecology - as chemical ecosystems are essentially equivalent to biological ones. So far, my results show CES consistently produces "messy" systems, with non-linear dynamics in almost every parameter. Currently, we are conducting computational analyses to test whether this is due to high sensitivity to initial conditions of our systems. Several publications, hopefully, coming soon...

Detecting seed-dependent autocatalysis

Computational models have shown that autocatalytic cycles (ACs) can sometimes be triggered by a one-time addition of a “seed” – a member species of the AC or a molecule that leads to production of a member species (Peng et al., 2022). Seed-dependent ACs could represent a mechanism for chemical memory, vital for emergence of biological evolution. Using LCMS, we look for seed-dependent ACs in prebiotic soups subjected to transfers-with-dilution and a one-time addition of candidate seed compounds in the beginning of the experiment. If a seed-dependent AC does not emerge, we expect the seed compound to be eventually diluted out of existence after multiple generations. 

In addition to autocatalytic cycles, I am interested in whether simple compartments, such as fatty acid vesicles, can show heritability and response to selection. We have published a study discussing some of our findings regarding heritability in vesicle systems. Currently, I am testing whether vesicle populations can show a definitive response to selection. I conduct experiments with the goal to select for vesicles with desired properties. This is analogous to artificial selection of biological organisms – but applied to chemistry. If I find that vesicles can respond to selection, this will support the idea that they could have been the first evolvers.

During Blue Marble Space Institute of Science (BMSIS) Young Scientist Program in the summer of 2021 I worked with Dr. Shiladitya DasSarma to study the evolution of reductive TCA cycle enzymes using a bioinformatical approach. We found that rTCA cycle evolution was highly complex and involved numerous horizontal gene transfers and we find it unlikely that it represents an ancestral carbon fixation process. Additionally, we found that syntrophy, or microbial mutualisms, may be involved in the functioning of rTCA. This highlights the role cooperative interactions could have played in the eovlution of metabolisms and, potentially, origins of life. This research was published in International Journal of Astrobiology in 2023.

From 2018-2021 I was part of the Meyer lab at Duke University. I worked with my mentor Dr. Tess Leuthner on examining the effect of environmental toxicants on mitochondrial DNA damage in C. elegans worms (Leuthner et al., 2022). I also worked on an independent research project studying the effects of Aflatoxin B1 on C. elegans gut microbiome. We found that when grown on a diverse compost-derived microbial substrate C. elegans become more resistant to aflatoxin toxicity (Sokolskyi et al., 2020). We also examined the microbiomes of Poikilolaimus oxycercus worms isolated from the same compost pile. Two publications on these projects are in the works!

Fossils were how I became interested in science and since early school I was collecting fossil shark teeth from various places. I participated in multiple field trips from 2013-2021 to Cretaceous deposits in Kaniv Natural Reserve with the help of Dr. Lilia Popova from TSKNU. We published a description of this locality in 2015: Popova et al., 2015.  Then with the help of Dr. Guillaume Guinot from University of Montpellier, France we published a detailed description of Kaniv shark fauna: Sokolskyi & Guinot, 2021. I also recently published a brief description of the first pterosaur findings from the region.

While studying in North Carolina in 2019 I worked with Dr. Lindsay Zanno in NC Museum of Natural Sciences to study tooth replacement in a dinosaur from Utah: Sokolskyi et al., 2019. I also participated in a 2-week field trip to Arches National Park, UT in the summer of 2019.