Abstract
Background
The familial nonmedullary thyroid cancer (FNMTC) is suspected to be a Mendelian condition in up to 3–8% of thyroid cancers. The susceptibility chromosomal loci and genes of 95% of FNMTC cases remain to be characterized. The inheritance of FNMTC appears to be autosomal dominant with incomplete penetrance and variable expressivity. The finding of the causative gene of FNMTC and the identification of patients at risk that need genetic testing were our aim.
Methods
We analyzed by whole-exome sequencing patients and non-affected relatives of five families with at least two family members affected by papillary thyroid cancer, selecting for new or extremely rare variants with predicted pathogenic value.
Results
A family showed, in all three affected members, a new loss-of-function variant (frameshift deletion) in BROX gene at 1q41 that was absent from all internal and external databases. In a second family with three affected relatives, we found an additional new BROX variant. The smaller families presented no variants in BROX or in the other causative genes studied.
Conclusions
BROX could be a new causative gene for FNMTC. Variants in BROX may result in the haploinsufficiency of a key gene involved in the morphogenesis of MVBs, in the endosomal sorting of cargo proteins, and in EGFR. Functional studies are needed to support this result. The thorough genomic analysis by NGS in all families with three or more affected members should become a routine approach to obtain a comprehensive genetic view and find confirmative second cases.
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Data availability
The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Acknowledgements
We thank the study participants, their families, and all the investigators and study staff members. VN Supported by grants from Telethon 2015 “Medicina Traslazionale in Oncologia: Dalla Ricerca alla Terapia PON01_02418”, Telethon 2016–2018 “Telethon Undiagnosed Disease Program”, 2018-22 EU Research Funding H2020-HEALTH-SC1-2017-RTD: “SOLVE RD”.
Funding
VN Supported by grants from Telethon 2015 “Medicina Traslazionale in Oncologia: Dalla Ricerca alla Terapia PON01_02418”, Telethon 2016–2018 “Telethon Undiagnosed Disease Program”, 2018-22 EU Research Funding H2020-HEALTH-SC1-2017-RTD: “SOLVE RD”.
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The study was approved by the local ethical committee of the Università della Campania “Luigi Vanvitelli” protocol n°54 del 2/5/2019 on Horizon 2020 Solve the Unsolved project.
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Pasquali, D., Torella, A., Accardo, G. et al. BROX haploinsufficiency in familial nonmedullary thyroid cancer. J Endocrinol Invest 44, 165–171 (2021). https://doi.org/10.1007/s40618-020-01286-6
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DOI: https://doi.org/10.1007/s40618-020-01286-6