EnsemblVEP Variant Recoder

Convert genetic variant identifiers between different nomenclature formats using the Ensembl Variant Recoder. Given a variant ID (e.g., rs number), returns equivalent representations in HGVS genomic (hgvsg), HGVS coding (hgvsc), HGVS protein (hgvsp), and SPDI format. Essential for cross-referencing variants across databases that use different notation systems. Example: 'rs429358' returns HGVS coding notation for all APOE transcripts.