Check out my google scholar or ORCID for a list of my publications! Note: it’s pretty short rn :)

new projects ?

I just began my work in Dr. Jean Fan’s lab in Spatial Transcriptomics, so I look forward to what the future has in store!

subtype discovery method utilizing scRNA-seq and microarray data

Our method, PHet, is able to distinguish multiple subtypes of data given only two labels (control and case)

Summary of Abstract

In disease diagnosis and targeted therapy, discovering subtypes is crucial as cells or patients can exhibit varied responses to treatments. Hence, understanding the heterogeneity of disease states is vital for comprehending pathological processes. However, selecting features for subtyping from high-dimensional datasets is challenging, with many algorithms focusing on known disease phenotypes and potentially overlooking valuable subtyping information. Our study aimed to address this issue by identifying feature sets that preserve heterogeneity while discriminating known disease states. Through a data-driven approach combining feature clustering and deep metric learning, we developed a statistical method called PHet (Preserving Heterogeneity). This method effectively identifies a minimal set of features that maintain heterogeneity while maximizing the quality of subtype clustering. PHet outperformed previous methods in identifying disease subtypes using microarray and single-cell RNA-seq datasets. Our research provides an innovative feature selection method that facilitates personalized medicine and enhances understanding of disease heterogeneity. I am co-first author with my former labmate Dr. Abdurrahman Abul-Basher.

Check out the preprint here.

image analysis of live-cell imaging

I worked under Dr. Kwonmoo Lee at Boston Children’s Hospital as a Research Assistant for two years after undergrad. My work included using various Convolutional Neural Networks (CNNs) for cell segmentation, utilizing cell tracking algorithms, honing my image manipulation skills (Fiji), working on my research writing aptitude, and much more! It was an incredible experience that has led me to where I am now :) Below are two papers I had the privilege of working on:

  • The Lee Lab developed a deep learning-based pipeline termed MARS-Net . While I did not contribute to it’s development, I helped the first author write the protocol for running it here.

  • I helped in optimizing the hyper parameters for the R-CNN in FNA-Net, a deep-learning based ensemble model aimed to screen the adequacy of unstained thyroid fine needle aspirations (FNA). Ideally, this will streamline the diagnostic process by eliminating the need for staining and expert interpretation.

  • My biggest project was a subtype discovery method termed PHet. The abstract and preprint are above!

undergraduate research at the University of Virginia

I started my research journey by collaborating with two incredible mentors, Dr. Tianxi Li and Dr. Frederic Padilla. Under Dr. Li’s guidance, I honed my coding skills in Python and R by converting his randnet package from R to Python. Later, I teamed up with Dr. Padilla to explore the effects of focused ultrasound on mouse tumors, which involved applying machine learning algorithms and statistical tests to understand its impact. In my final project my fourth year, I focused on classifying brain tumor regions in contrast-enhanced ultrasound images using microbubble intensity. I presented my final work via zoom (bc covid) where I expressed how well various unsupervised and supervised methods faired in this task. Though I didn’t publish any papers or achieve significant outcomes, this experience was incredibly valuable and marked the beginning of my research journey. I am immensely grateful to both mentors for the opportunity they gave me, as I don’t think I would be where I am now without them!

github contributions

Caleb Hallinan's Github chart