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svMIL: predicting the pathogenic effect of TAD boundary-disrupting somatic structural variants through multiple

Marleen M Nieboer1, Jeroen de Ridder1

  • 1Center for Molecular Medicine, Oncode Institute, University Medical Center Utrecht, Utrecht 3584 CG, The Netherlands.

Bioinformatics (Oxford, England)
|December 31, 2020
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Summary

Predicting the impact of structural variants (SVs) in cancer is challenging. Our new method, svMIL, uses multiple instance learning to identify pathogenic SVs disrupting Topologically Associated Domains (TADs) and their regulatory interactions.

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Area of Science:

  • Genomics
  • Cancer Biology
  • Bioinformatics

Background:

  • Structural variants (SVs) are crucial in cancer development, but predicting their functional impact, particularly in non-coding regions, remains a significant challenge.
  • Non-coding SVs can disrupt Topologically Associated Domain (TAD) boundaries, altering gene-regulatory element interactions, yet their pathogenicity is often unclear.
  • Current machine learning approaches struggle to represent the complex interaction disruptions caused by SVs within traditional feature matrices.

Purpose of the Study:

  • To develop a novel method, svMIL, for predicting the pathogenicity of SVs that disrupt TAD boundaries.
  • To overcome the limitations of traditional feature matrices in representing SV-induced interaction disruptions using multiple instance learning.
  • To analyze the distinct regulatory interaction alterations associated with pathogenic somatic SVs compared to non-pathogenic somatic and germline SVs.

Main Methods:

  • Introduction of svMIL, a multiple instance learning (MIL) based method for predicting pathogenic SV effects.
  • svMIL groups SVs into 'bags,' accommodating varying numbers of disrupted interactions without requiring a fixed feature matrix.
  • Validation of svMIL's predictive capability using gene expression aberration data from various cancer types.

Main Results:

  • svMIL successfully predicts the pathogenicity of TAD boundary-disrupting SVs across different cancer types, correlating with gene expression aberrations.
  • The study reveals distinct patterns of regulatory interaction disruption between pathogenic somatic SVs, non-pathogenic somatic SVs, and germline SVs.
  • svMIL demonstrates the utility of MIL in handling complex genomic interaction data for pathogenicity prediction.

Conclusions:

  • svMIL provides a robust method for identifying pathogenic SVs in non-coding regions by analyzing their impact on TAD boundaries and regulatory interactions.
  • The findings highlight the differential impact of various SV types on regulatory networks, offering insights into cancer mechanisms.
  • The developed method and its code are publicly available, facilitating further research in cancer genomics and SV analysis.