The first Dutch SDHB founder deletion in paraganglioma-pheochromocytoma patients.
Publication year
2009Source
BMC Medical Genetics, 10, 10, (2009), pp. 34ISSN
Publication type
Article / Letter to editor
Display more detailsDisplay less details
Organization
Otorhinolaryngology
Internal Medicine
Human Genetics
Journal title
BMC Medical Genetics
Volume
vol. 10
Issue
iss. 10
Page start
p. 34
Page end
p. 34
Subject
DCN 2: Functional Neurogenomics; NCEBP 14: Cardiovascular diseasesAbstract
BACKGROUND: Germline mutations of the tumor suppressor genes SDHB, SDHC and SDHD play a major role in hereditary paraganglioma and pheochromocytoma. These three genes encode subunits of succinate dehydrogenase (SDH), the mitochondrial tricarboxylic acid cycle enzyme and complex II component of the electron transport chain. The majority of variants of the SDH genes are missense and nonsense mutations. To date few large deletions of the SDH genes have been described. METHODS: We carried out gene deletion scanning using MLPA in 126 patients negative for point mutations in the SDH genes. We then proceeded to the molecular characterization of deletions, mapping breakpoints in each patient and used haplotype analysis to determine whether the deletions are due to a mutation hotspot or if a common haplotype indicated a single founder mutation. RESULTS: A novel deletion of exon 3 of the SDHB gene was identified in nine apparently unrelated Dutch patients. An identical 7905 bp deletion, c.201-4429_287-933del, was found in all patients, resulting in a frameshift and a predicted truncated protein, p.Cys68HisfsX21. Haplotype analysis demonstrated a common haplotype at the SDHB locus. Index patients presented with pheochromocytoma, extra-adrenal PGL and HN-PGL. A lack of family history was seen in seven of the nine cases. CONCLUSION: The identical exon 3 deletions and common haplotype in nine patients indicates that this mutation is the first Dutch SDHB founder mutation. The predominantly non-familial presentation of these patients strongly suggests reduced penetrance. In this small series HN-PGL occurs as frequently as pheochromocytoma and extra-adrenal PGL.
This item appears in the following Collection(s)
- Academic publications [246936]
- Electronic publications [134293]
- Faculty of Medical Sciences [93487]
- Open Access publications [107816]
Upload full text
Use your RU credentials (u/z-number and password) to log in with SURFconext to upload a file for processing by the repository team.