2026-04-29T22:57:46Zhttps://repisalud.isciii.es/rest/oai/requestoai:repisalud.isciii.es:20.500.12105/260722025-12-18T12:55:59Zcom_20.500.12105_2327com_20.500.12105_2290col_20.500.12105_16991
Repisalud
author
Comino-Méndez, Iñaki
author
Tejera, Águeda M
author
Currás-Freixes, María
author
Remacha, Laura
author
Gonzalvo, Pablo
author
Tonda, Raúl
author
Letón, Rocío
author
Blasco, MA
author
Robledo Batanero, Mercedes
author
Cascon Soriano, Alberto
funder
Instituto de Salud Carlos III
funder
Severo Ochoa Excellence Programme
2025-01-20T15:12:35Z
2025-01-20T15:12:35Z
2016-06
Cancer Genet . 2016 Jun;209(6):272-7
Cancer Genetics
27209355
https://hdl.handle.net/20.500.12105/26072
Pheochromocytomas (PCCs) and paragangliomas (PGLs) are tumors arising from the adrenal medulla and sympathetic/parasympathetic paraganglia, respectively. Approximately 40% of PCCs/PGLs are due to germline mutations in one of 16 susceptibility genes, and a further 30% are due to somatic alterations in 5 main genes. Recently, somatic ATRX mutations have been found in succinate dehydrogenase (SDH)-associated hereditary PCCs/PGLs. In the present study we applied whole-exome sequencing to the germline and tumor DNA of a patient with metastatic composite PCC and no alterations in known PCC/PGL susceptibility genes. A somatic loss-of-function mutation affecting ATRX was identified in tumor DNA. Transcriptional profiling analysis classified the tumor within cluster 2 of PCCs/PGLs (without SDH gene mutations) and identified downregulation of genes involved in neuronal development and homeostasis (NLGN4, CD99 and CSF2RA) as well as upregulation of Drosha, an important gene involved in miRNA and rRNA processing. CpG island methylator phenotype typical of SDH gene-mutated tumors was ruled out, and SNP array data revealed a unique profile of gains and losses. Finally, we demonstrated the presence of alternative lengthening of telomeres in the tumor, probably associated with the failure of ATRX functions. In conclusion, somatic variants affecting ATRX may play a driver role in sporadic PCC/PGL.
eng
ALT
ATRX
exome sequencing
pheochromocytoma
ATRX driver mutation in a composite malignant pheochromocytoma.
research article
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