Mihir Bafna

selected publications

DiffRNAFold

NeurIPS MLSB

DiffRNAFold: Generating RNA Tertiary Structures with Latent Space Diffusion

Mihir Bafna, Vikranth Keerthipati, Subhash Kanaparthi, and Ruochi Zhang

In NeurIPS Workshop on Machine Learning for Structural Biology (NeurIPS MLSB) Dec 2023

Abs

Abstract RNA molecules provide an exciting frontier for novel therapeutics. Accurate determination of RNA structure could accelerate development of therapeutics through an improved understanding of function. However, the extremely large conformation space has kept the RNA 3D structure space largely unresolved. Using recent advances in generative modeling, we propose DiffRNAFold, a latent space diffusion model for RNA tertiary structure design. Our preliminary results suggest that DiffRNAFold generated molecules are similar in 3D space to true RNA molecules, providing an important first step towards accurate structure and function prediction in vivo.
Clarify

ISMB
CLARIFY: Cell-cell interaction and gene regulatory network refinement from spatially resolved transcriptomics

Mihir Bafna, Hechen Li, and Xiuwei Zhang

ISMB and Bioinformatics Jun 2023

Abs Paper Code Press Bib

Motivation: Gene regulatory networks (GRNs) in a cell provide the tight feedback needed to synchronize cell actions. However, genes in a cell also take input from, and provide signals to other neighboring cells. These cell-cell interactions (CCIs) and the GRNs deeply influence each other. Many computational methods have been developed for GRN inference in cells. More recently, methods were proposed to infer CCIs using single cell gene expression data with or without cell spatial location information. However, in reality, the two processes do not exist in isolation and are subject to spatial constraints. Despite this rationale, no methods currently exist to infer GRNs and CCIs using the same model. Results: We propose CLARIFY, a tool that takes GRNs as input, uses them and spatially resolved gene expression data to infer CCIs, while simultaneously outputs refined cell-specific GRNs. CLARIFY uses a novel multi-level graph autoencoder, which mimics cellular networks at a higher level and cell-specific GRNs at a deeper level. We applied CLARIFY to two real spatial transcriptomic datasets, one using seqFISH and the other using MERFISH, and also tested on simulated datasets from scMultiSim. We compared the quality of predicted GRNs and CCIs with state-of-the-art baseline methods that inferred either only GRNs or only CCIs. The results show that CLARIFY consistently outperforms the baseline in terms of commonly used evaluation metrics. Our results point to the importance of co-inference of CCIs and GRNs and to the use of layered graph neural networks as an inference tool for biological networks.
@article{Clarify, author = {Mihir, Bafna and Hechen, Li and Xiuwei, Zhang}, title = {CLARIFY: Cell-cell interaction and gene regulatory network refinement from spatially resolved transcriptomics}, booktitle = {31st Conference on Intelligent Systems for Molecular Biology}, short = {ISMB}, year = {2023}, journal = {Bioinformatics}, volume = {39}, number = {Supplement_1}, pages = {i484-i493}, month = jun, press = {https://www.cc.gatech.edu/news/award-winning-computer-models-propel-research-cellular-differentiation}, publisher = {Oxford University Press}, appear = {true}, }
DeepVifi

ACM-BCB
DeepViFi: Detecting Oncoviral Infections in Cancer Genomes Using Transformers

Utkrisht Rajkumar, Sara Javadzadeh, Mihir Bafna, Dongxia Wu, Rose Yu, Jingbo Shang, and Vineet Bafna

In Proceedings of the 13th ACM International Conference on Bioinformatics, Computational Biology and Health Informatics (ACM-BCB) Jun 2022

Abs Paper Code Bib

We consider the problem of identifying viral reads in human host genome data. We pose the problem as open-set classification as reads can originate from unknown sources such as bacterial and fungal genomes. Sequence-matching methods have low sensitivity in recognizing viral reads when the viral family is highly diverged. Hidden Markov models have higher sensitivity but require domain-specific training and are difficult to repurpose for identifying different viral families. Supervised learning methods can be trained with little domain-specific knowledge but have reduced sensitivity in open-set scenarios. We present DeepViFi, a transformer-based pipeline, to detect viral reads in short-read whole genome sequence data. At 90% precision, DeepViFi achieves 90% recall compared to 15% for other deep learning methods. DeepViFi provides a semi-supervised framework to learn representations of viral families without domain-specific knowledge, and rapidly and accurately identify target sequences in open-set settings.
@inproceedings{DeepVifi, author = {Utkrisht, Rajkumar and Sara, Javadzadeh and Mihir, Bafna and Dongxia, Wu and Rose, Yu and Jingbo, Shang and Vineet, Bafna}, title = {DeepViFi: Detecting Oncoviral Infections in Cancer Genomes Using Transformers}, year = {2022}, isbn = {9781450393867}, publisher = {Association for Computing Machinery}, address = {New York, NY, USA}, url = {https://doi.org/10.1145/3535508.3545551}, doi = {10.1145/3535508.3545551}, booktitle = {Proceedings of the 13th ACM International Conference on Bioinformatics, Computational Biology and Health Informatics}, shorttitle = {ACM-BCB}, short = {ACM-BCB}, articleno = {2}, numpages = {8}, keywords = {neural networks, viral detection, natural language processing, open-set classification}, location = {Northbrook, Illinois}, series = {BCB '22}, }

MetaDetect

Computer-implemented methods for quantitation of features of interest in whole slide imaging

Nam Nguyen, Lorena Mora-Blanco, Kristen Turner, Julie Weise, Jason Christiansen, and Mihir Bafna

Provisional patent. PCT/US2021/022308 Mar 2021

@patent{MetaDetect,
  title = {Computer-implemented methods for quantitation of features of interest in
  whole slide imaging},
  author = {Nam, Nguyen and Lorena, Mora-Blanco and Kristen, Turner and Julie, Weise and Jason, Christiansen and Mihir, Bafna},
  year = {2021},
  number = {022308},
  filing = {Provisional patent. PCT/US2021/022308},
  month = mar,
  notes = {filed March 15, 2021},
  abs = {}
}