Complex MAX rearrangement in a family with malignant pheochromocytoma, renal oncocytoma, and erythrocytosis

Esther Korpershoek, Djamailys Koffy, Bert H. Eussen, Lindsey Oudijk, Thomas G. Papathomas, Francien H. Van Nederveen, Eric J.T. Belt, Gaston J.H. Franssen, David F.J. Restuccia, Niels M.G. Krol, Rob B. Van Der Luijt, Richard A. Feelders, Rogier A. Oldenburg, Wilfred F.J. Van Ijcken, Annelies De Klein, Wouter W. De Herder, Ronald R. De Krijger, Winand N.M. DInjens

Onderzoeksoutput: Bijdrage aan tijdschriftArtikelpeer review

39 Citaten (Scopus)

Samenvatting

Context: Familial pheochromocytoma (PCC) has been associated with germline mutations in 16 genes. Here we investigated three siblings presenting with bilateral pheochromocytomas. In addition, the index patient also exhibited renal oncocytoma and erythrocytosis, whereas the second sibling presented with a lymph node metastasis. Design: First, single-nucleotide polymorphism array and exome sequencing were performed on germline and PCC-derived DNA to identify genomic alterations in the index patient. Second, alterations were confirmed and validated by Sanger sequencing, analyzed by (multiplexed) PCR to determine the loss of the wild-type allele,andinvestigated by immunohistochemistry in the tumors of the three siblings. Results: The index patient's germline DNA revealed a large complex genomic alteration encompassing the intragenic and promoter regions of Myc-associated factor X (MAX) and alpha-(1,6)-fucosyltransferase (FUT8). In all three siblings the MAX alteration was confirmed, and the loss of the wild-type MAX and FUT8 alleles was demonstrated in all tumors. Uniparental disomy of chromosome 14q, previously demonstrated as a hallmark forMAX-related PCC, was shown in the index patient's PCC by single-nucleotide polymorphism array. Loss of MAX and FUT8 protein expression was demonstrated by immunohistochemistry in the tumors from the three siblings. Conclusions: Our results indicate that large genomic deletions of MAX should be considered in familial and bilateral PCC with prior negative testing for gene mutations. In addition, our results confirm thatMAXis a tumor suppressor gene for renal oncocytomas.

Originele taal-2Engels
Pagina's (van-tot)453-460
Aantal pagina's8
TijdschriftJournal of Clinical Endocrinology and Metabolism
Volume101
Nummer van het tijdschrift2
DOI's
StatusGepubliceerd - feb. 2016
Extern gepubliceerdJa

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