Investigating Impact of Differential Metabolic Gene Expressions on a Panel of Cancers

Rachel Tbeile Mann, Verrazzano Class of 2024, completed major in Psychology and minor in Biology

I have always enjoyed researching topics that interest me, and this project was no different. I had decided to graduate earlier than I expected to, so I was working on a shorter timeline but still enjoyed the process of researching and developing this thesis.

After taking radiation biology with Dr. Liu-Sullivan, I knew that I wanted to explore this topic further and reached out to her at the end of the semester about doing research. Initially, the focus of the research was going to be an investigation of drinking water quality of zip codes that are near the now closed Fresh Kills Landfill. However, the project had to be redesigned.

The Environmental Working Group’s (EWG) water quality database is only based on one water sample for all of New York, making a comparison of different zip codes impossible. As I had been a part of a research group, we decided to base our project instead on studying five types of cancers that are unusually prevalent among the Staten Island population. We each studied one of those cancers (I studied pancreatic cancer) and how varying levels of gene expression of three genes impact patient prognostics and overall survival.

To analyze the impact of gene expression on patient prognostics and overall survival, I used the KAPLAN-MEIER PLOTTER, which is a comprehensive database that provides information on differential gene expressions using Affimetrix, RNAseq, and DNA sets. This website provides figures that can then be analyzed to gain insight on differential gene expression.

The three genes I studied were: leptin, insulin, and insulin-growth factor. Insulin, which is secreted by the pancreas, controls blood sugar levels to maintain homeostasis. A regulatory protein called insulin-like growth factor (IGF-1) controls growth hormones and stimulates the formation of new bones and tissues. Leptin is a protein hormone that is secreted by adipocytes and is vital to the body's energy balance. Leptin stimulates the growth of cancer cells, motility, and metastasis when a malignant tumor appears, although it is not always a cause of cancer.

It is interesting to note that while I expected differential levels of gene expression to have significant impacts on patient prognostic and survival in pancreatic cancer, that was not the case for all of the genes I had studied. Since my results weren’t what I expected, I feel like I gained even more insight on this topic than anticipated.

Through this thesis, I gained a better understanding of how research is conducted in the science world and learned that it doesn’t always go as expected. I also improved my collaboration and data analysis skills. Overall, I am grateful for this experience and especially for the unwavering guidance and support of my mentor throughout this process.