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All Publications


  • Deep hierarchical embedding for simultaneous modeling of GPCR proteins in a unified metric space. Scientific reports Lee, T., Lee, S., Kang, M., Kim, S. 2021; 11 (1): 9543

    Abstract

    GPCR proteins belong to diverse families of proteins that are defined at multiple hierarchical levels. Inspecting relationships between GPCR proteins on the hierarchical structure is important, since characteristics of the protein can be inferred from proteins in similar hierarchical information. However, modeling of GPCR families has been performed separately for each of the family, subfamily, and sub-subfamily level. Relationships between GPCR proteins are ignored in these approaches as they process the information in the proteins with several disconnected models. In this study, we propose DeepHier, a deep learning model to simultaneously learn representations of GPCR family hierarchy from the protein sequences with a unified single model. Novel loss term based on metric learning is introduced to incorporate hierarchical relations between proteins. We tested our approach using a public GPCR sequence dataset. Metric distances in the deep feature space corresponded to the hierarchical family relation between GPCR proteins. Furthermore, we demonstrated that further downstream tasks, like phylogenetic reconstruction and motif discovery, are feasible in the constructed embedding space. These results show that hierarchical relations between sequences were successfully captured in both of technical and biological aspects.

    View details for DOI 10.1038/s41598-021-88623-8

    View details for PubMedID 33953216

  • Learning Cell-Type-Specific Gene Regulation Mechanisms by Multi-Attention Based Deep Learning With Regulatory Latent Space FRONTIERS IN GENETICS Kang, M., Lee, S., Lee, D., Kim, S. 2020; 11: 869

    Abstract

    Epigenetic gene regulation is a major control mechanism of gene expression. Most existing methods for modeling control mechanisms of gene expression use only a single epigenetic marker and very few methods are successful in modeling complex mechanisms of gene regulations using multiple epigenetic markers on transcriptional regulation. In this paper, we propose a multi-attention based deep learning model that integrates multiple markers to characterize complex gene regulation mechanisms. In experiments with 18 cell line multi-omics data, our proposed model predicted the gene expression level more accurately than the state-of-the-art model. Moreover, the model successfully revealed cell-type-specific gene expression control mechanisms. Finally, the model was used to identify genes enriched for specific cell types in terms of their functions and epigenetic regulation.

    View details for DOI 10.3389/fgene.2020.00869

    View details for Web of Science ID 000577591400001

    View details for PubMedID 33133123

    View details for PubMedCentralID PMC7561362

  • RansomBlocker: a Low-Overhead Ransomware-Proof SSD Park, J., Jung, Y., Won, J., Kang, M., Lee, S., Kim, J., ACM ASSOC COMPUTING MACHINERY. 2019