142: PALB2 ACMG/AMP Specifications

Richardson M et al., The American Journal of Human Genetics - An international HBOP Variant Curation Expert Panel developed PALB2-specific specifications of the 2015 ACMG/AMP variant-interpretation guidelines by tailoring, limiting, or removing existing codes and tested them on 39 pilot variants to improve ClinVar concordance and harmonize classification. Key terms: PALB2, ACMG/AMP, variant curation, HBOP VCEP, ClinVar. Study Highlights:The HBOP VCEP reviewed ACMG/AMP codes and advised against 13 codes, limited six, and tailored nine to PALB2-specific biology. They set conservative population thresholds (BA1 0.1%, BS1 0.01%) and refined PVS1/PVS1(RNA) application, defining Tyr1183 as a C-terminal boundary for loss-of-function evidence. A pilot curation of 39 variants produced concordant classifications for 31 of 37 ClinVar variants (84%) and led to reclassification of several VUS/conflicting entries. The recommendations are conservative and evidence-based to support harmonized PALB2 variant interpretation and clinical reporting. Conclusion:PALB2-specific ACMG/AMP specifications provide a conservative, evidence-based framework that improves harmonization and accuracy of variant classification, supporting ClinVar deposition and clinical management of carriers. Music:Enjoy the music based on this article at the end of the episode. Article title:Specifications of the ACMG/AMP variant curation guidelines for the analysis of germline PALB2 sequence variants First author:Richardson M Journal:The American Journal of Human Genetics DOI:10.1016/j.ajhg.2025.08.020 Reference:Richardson M.E. et al., Specifications of the ACMG/AMP variant curation guidelines for the analysis of germline PALB2 sequence variants. The American Journal of Human Genetics. 2025;112:1–15. https://doi.org/10.1016/j.ajhg.2025.08.020 License:This episode is based on an open-access article published under the Creative Commons Attribution 4.0 International License (CC BY 4.0) – https://creativecommons.org/licenses/by/4.0/ Support:Base by Base – Stripe donations: https://donate.stripe.com/7sY4gz71B2sN3RWac5gEg00 Official website https://basebybase.com On PaperCast Base by Base you'll discover the latest in genomics, functional genomics, structural genomics, and proteomics. Episode link: https://basebybase.com/episodes/specifications-of-the-acmg-amp-guidelines-for-palb2-variant-interpretation QC:This episode was checked against the original article PDF and publication metadata for the episode release published on 2025-09-19. QC Scope:- article metadata and core scientific claims from the narration- excludes analogies, intro/outro, and music- transcript coverage: Audited the transcript sections on PALB2 biology, HBOPVCEP PALB2 specifications, ACMG/AMP code modifications, pilot study outcomes, missense/pathogenicity limitations, PVS1/Tyr1183 boundary, splicing guidance, VUS backlog, and the need for high-throughput functional assays.- transcript topics: PALB2 role in homologous recombination repair; HBOPVCEP PALB2 specifications and code changes; Pilot study results and ClinVar concordance; VUS resolution outcomes; Missense pathogenicity limitations and splicing considerations; PVS1, Tyr1183 boundary and RNA splicing guidance QC Summary:- factual score: 10/10- metadata score: 10/10- supported core claims: 7- claims flagged for review: 0- metadata checks passed: 4- metadata issues found: 0 Metadata Audited:- article_doi- article_title- article_journal- license Factual Items Audited:- HBOPVCEP PALB2 specifications exist and tailor/limit ACMG/AMP codes for PALB2- Pilot with 39 PALB2 variants; 37 in ClinVar; 84% concordance with ClinVar classifications- Among ClinVar VUS/...