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Completely resolved structural variants by optical genome mapping with adaptive sampling from CNV discovery.

Li Fu1,2, Chong Ae Kim3, Masatoshi Tokita4

  • 1Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Japan.

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Summary

Optical genome mapping (OGM) combined with long-read sequencing effectively detects complex structural variants (SVs) missed by other methods. This integrated approach enhances diagnostic resolution for rare genetic diseases.

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Area of Science:

  • Genomics
  • Genetic Medicine
  • Molecular Biology

Background:

  • Structural variants (SVs) are crucial for human phenotypic diversity but challenging to detect due to size and complexity.
  • Existing methods often struggle with comprehensive SV characterization, impacting genetic diagnoses.

Purpose of the Study:

  • To fully characterize structural variants (SVs) using Optical Genome Mapping (OGM).
  • To evaluate the diagnostic utility of combining OGM with long-read sequencing for complex SV detection.

Main Methods:

  • Applied Optical Genome Mapping (OGM) to 30 cases with known copy number variants.
  • Utilized Oxford Nanopore long-read sequencing with adaptive sampling to pinpoint SV breakpoints.

Main Results:

  • Undetected SVs were revealed in 46.7% of cases.
  • Gene disruptions or copy number alterations explaining clinical features were identified in 23.3% of cases.
  • Complex SVs involving multiple chromosomal segments were efficiently resolved.

Conclusions:

  • Integrating OGM and long-read sequencing significantly improves diagnostic resolution compared to sequencing alone.
  • This combined approach offers a robust framework for interpreting complex SVs.
  • The findings support the clinical utility of OGM and long-read sequencing for precision medicine in rare genetic diseases.