AUTHOR=Aguiar Talita , Teixeira Anne , Scliar Marília O. , Sobral de Barros Juliana , Lemes Renan B. , Souza Silvia , Tolezano Giovanna , Santos Fernanda , Tojal Israel , Cypriano Monica , Caminada de Toledo Silvia Regina , Valadares Eugênia , Borges Pinto Raquel , Pinto Artigalas Osvaldo Afonso , Caetano de Aguirre Neto Joaquim , Novak Estela , Cristofani Lilian Maria , Miura Sugayama Sofia M. , Odone Vicente , Cunha Isabela Werneck , Lima da Costa Cecilia Maria , Rosenberg Carla , Krepischi Ana TITLE=Unraveling the Genetic Architecture of Hepatoblastoma Risk: Birth Defects and Increased Burden of Germline Damaging Variants in Gastrointestinal/Renal Cancer Predisposition and DNA Repair Genes JOURNAL=Frontiers in Genetics VOLUME=13 YEAR=2022 URL=https://www.frontiersin.org/journals/genetics/articles/10.3389/fgene.2022.858396 DOI=10.3389/fgene.2022.858396 ISSN=1664-8021 ABSTRACT=

The ultrarare hepatoblastoma (HB) is the most common pediatric liver cancer. HB risk is related to a few rare syndromes, and the molecular bases remain elusive for most cases. We investigated the burden of rare damaging germline variants in 30 Brazilian patients with HB and the presence of additional clinical signs. A high frequency of prematurity (20%) and birth defects (37%), especially craniofacial (17%, including craniosynostosis) and kidney (7%) anomalies, was observed. Putative pathogenic or likely pathogenic monoallelic germline variants mapped to 10 cancer predisposition genes (CPGs: APC, CHEK2, DROSHA, ERCC5, FAH, MSH2, MUTYH, RPS19, TGFBR2 and VHL) were detected in 33% of the patients, only 40% of them with a family history of cancer. These findings showed a predominance of CPGs with a known link to gastrointestinal/colorectal and renal cancer risk. A remarkable feature was an enrichment of rare damaging variants affecting different classes of DNA repair genes, particularly those known as Fanconi anemia genes. Moreover, several potentially deleterious variants mapped to genes impacting liver functions were disclosed. To our knowledge, this is the largest assessment of rare germline variants in HB patients to date, contributing to elucidate the genetic architecture of HB risk.