Optical Genome Mapping in Routine Human Genetic Diagnostics-Its Advantages and Limitations

Area of Science:

• Genomics
• Molecular Biology
• Medical Diagnostics

Background:

• Optical genome mapping (OGM) is an emerging technology for detecting large-scale structural variants (SVs) in the human genome.
• OGM offers potential for identifying SVs that are challenging for conventional methods, positioning it as a possible frontline diagnostic approach.

Purpose of the Study:

• To evaluate the capabilities and limitations of optical genome mapping (OGM) using the Saphyr system for human genetic diagnostics.
• To explore the prerequisites for detecting various chromosomal variants and assess OGM's applicability in routine diagnostic settings.

Main Methods:

• The study utilized the Saphyr system for optical genome mapping.
• Fourteen DNA samples with known structural or numerical chromosomal variants (deletions, duplications, inversions, trisomies, translocations) were analyzed.
• OGM data from 54 samples were reviewed to understand variant detection prerequisites and limitations.

Main Results:

• OGM successfully confirmed 12 out of 14 previously identified structural or numerical chromosomal variants.
• One deletion and one inversion variant could not be confirmed by OGM.
• The study identified limitations of OGM, some related to its novelty and others inherent to the technology.

Conclusions:

• Optical genome mapping (OGM) demonstrates significant potential as a diagnostic tool for detecting large structural variants in human genomes.
• Further experience and methodological refinement are needed to overcome current limitations and optimize OGM for routine genetic diagnostics.
• Challenges associated with implementing OGM in clinical settings were identified, requiring careful consideration for widespread adoption.