Endocrine

, Volume 35, Issue 3, pp 347–355

Mutations and polymorphisms in the SDHB, SDHD, VHL, and RET genes in sporadic and familial pheochromocytomas

  • Jens Waldmann
  • Peter Langer
  • Nils Habbe
  • Volker Fendrich
  • Anette Ramaswamy
  • Matthias Rothmund
  • Detlef K. Bartsch
  • Emily P. Slater
Original Paper

DOI: 10.1007/s12020-009-9178-y

Cite this article as:
Waldmann, J., Langer, P., Habbe, N. et al. Endocr (2009) 35: 347. doi:10.1007/s12020-009-9178-y

Abstract

The prevalence of germ line mutations within the RET-protooncogene and the tumor suppressor genes SDHB, SDHD, and VHL in pheochromocytomas (PC) varies in recent studies from 12 to 24%, if one look at them collectively. DNA was extracted from frozen tumor tissue as well as from blood leukocytes of 36 PC (26 sporadic/10 MEN2). Exons 1-8 of the SDHB-gene, 1-4 of the SDHD-gene, 1-3 of the VHL-gene, and exons 10, 11, 13, 14, 16 of the RET-gene were amplified by PCR and analyzed by DHPLC with the Transgenomic WAVE®-System. Samples with aberrant wave profiles were subjected to direct sequencing. Genetic aberrations were correlated to clinical characteristics. Germ line mutations in sporadic PC were identified in four patients (11%) whereas somatic mutations were observed in two (5%) patients. Nine coding polymorphisms (PM) were identified in seven (19%) patients. Intronic variants were observed in six (17%) patients and were all located in the SHDB gene. Patients with wild type alleles in all assessed genes were older (53 vs. 37 years, P = 0.007) and presented with an increased tumor size (49 vs. 32 mm, P = 0.003) compared to patients with mutations. Malignant PC revealed multiple (>2) genetic alterations more frequently than benign PC (4/7 vs. 4/29, P = 0.03). Interestingly intronic variants of the SDHB gene occur more frequently in malignant than in benign PC (3/7 vs. 2/29, P = 0.04). The frequency of germ line mutations in sporadic pheochromocytomas was lower in our cohort than previously reported. Polymorphisms of the RET gene are common (17%) and occur in familial and sporadic PC. Multiple genetic alterations including mutations, polymorphisms and intronic variants are more frequently observed in malignant PC.

Keywords

PheochromocytomaGeneticsMutations

Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Jens Waldmann
    • 1
    • 2
  • Peter Langer
    • 1
  • Nils Habbe
    • 1
  • Volker Fendrich
    • 1
  • Anette Ramaswamy
    • 1
  • Matthias Rothmund
    • 1
  • Detlef K. Bartsch
    • 1
  • Emily P. Slater
    • 1
  1. 1.Department of SurgeryUniversity Hospital Giessen and MarburgMarburgGermany
  2. 2.Department of SurgeryPhilipps University MarburgMarburgGermany