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/...