GA4GH Connect session follow up - Variant Representation Alignment

[Beatrice Amos]

Dear Colleagues,

Thank you all for contributing to the GA4GH Connect session: Variant Representation Alignment / Variantüff - what a productive and engaging discussion! A big thank you to Alex Wagner, Larry Babb, and Melissa Cline for an excellent session, and to all participants for their valuable contributions and engaging discussions. Your input made this a truly meaningful conversation.

‼️ Please take a moment to review the meeting notes and share any edits or additions to help keep the summary accurate and complete. If you notice any mistakes, have resources to add, or want to share more details, please feel free to jump in and update the notes - we welcome your input! A link to the recording is available in the linked meeting notes.

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Key Takeaways

🔶 A unified, precise, and computable variant representation standard is needed to ensure interoperability and accurate cross-platform data exchange.
🔶 Current systems and legacy formats introduce ambiguities and inconsistencies that hinder accurate variant identification and integration.
🔶 Modern use cases, such as structural, complex, and pangenomic variants, require scalable, structured formats that support ambiguity handling, multi-assay data, and flexible aggregation.

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Meeting Summary

This session focused on the challenges in variant representation and interoperability. Different identifier systems were discussed and widespread issues with ambiguity, inconsistency, and misalignment across formats were highlighted. Specific challenges included:

• VCF: inconsistent implementations, non-standard separators, and ambiguous info fields.
• HGVS & SPDI: transcript ambiguities, outdated documentation, and coordinate confusion.
• RSIDs: location-based rather than variant-specific, limiting precision.
• Structural variants: fuzzy breakpoints and aggregation difficulties.
• Cross-cutting issues: liftover ambiguities, one-to-many mappings, and scaling limitations of text-based formats.

Breakout groups emphasised inertia in adopting updates, day-to-day pain points for researchers and bioinformaticians, and the need for standardisation, improved computational identifiers, and scalable formats to support complex variants.

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Action Items

🔶 Consolidate feedback from breakout sessions to inform future GA4GH standardisation efforts.
🔶 Encourage community alignment on a standardised, unambiguous variant representation format for display and search.
🔶 Improve documentation and tooling support for existing specifications to reduce implementation variability.

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Please take a moment to complete our Exit Survey: https://forms.ga4gh.org/t/qjHm9R1EGmus
Your feedback is invaluable and helps us improve future GA4GH Plenary and Connect meetings, ensuring they continue to provide the best possible experience for our community.

If there's anything we missed or anything you'd like to add, feel free to reach out!

Thanks again for your engagement and contributions!

Best,
Beatrice

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Beatrice Amos

Work Stream Manager

beatri...@ga4gh.org

ba...@sanger.ac.uk

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