ClinGen Glaucoma Variant Curation Expert Panel recommendations enhance classification of myocilin variants
Tompson, S. W. J.; Graham, P.; Hadler, J.; Pasutto, F.; Whisenhunt, K. N.; Chakrabarti, S.; Young, T. L.; Craig, J. E.; Hewitt, A. W.; Siggs, O. M.; Hulleman, J. D.; Mackey, D. A.; Burdon, K. P.; Dubowsky, A.; Souzeau, E.
Show abstract
Pathogenic variants in the myocilin (MYOC) gene are the most common cause of Mendelian open-angle glaucoma. In 2022, the Clinical Genome Resource (ClinGen) Glaucoma Variant Curation Expert Panel (VCEP) published rule specifications for MYOC variant interpretation, including a pilot study of 81 variants. Here, we present the results of curating 271 MYOC variants reported in people with open-angle glaucoma using updated specification rules. Of all the variants, 11 were classified as benign (B), 45 as likely benign (LB), 166 as variants of uncertain significance (VUS), 35 as likely pathogenic (LP), and 14 as pathogenic (P). All LP/P variants were located within the conserved olfactomedin domain encoded by exon 3. The updated variant curation guidelines from the Glaucoma VCEP increased the number of clinically definitive classifications from 28% (74/265) to 39% (105/271), with 95% (41/43) of reclassified variants moving to greater clinical relevance. Functional evidence was lacking for 93% (154/166) of VUS. Additional functional evidence could further enhance classification by halving (85/166) the proportion of those classified as VUS. These findings highlight the role of rule calibration and rigorous functional evidence assessment toward improving variant classification with clinical utility for patients.
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