Human Molecular Genetics, Vol 6, 1051-1056, Copyright © 1997 by Oxford University Press
ER Woodward, C Eng, R McMahon, R Voutilainen, NA Affara, BA Ponder and ER Maher
Inherited predisposition to phaeochromocytoma (MIM No 171300) occurs in
multiple endocrine neoplasia type 2 (MEN 2) (MIM No 171400), von Hippel-
Lindau (VHL) disease (MIM No 199300), and neurofibromatosis type 1 (NF1)
(MIM No 162200). In addition, familial phaeochromocytoma alone has also
been reported and we and others have identified germline VHL mutations in
five of six kindreds analysed previously. Germline mutations in the RET
proto-oncogene, which encodes a receptor tyrosine kinase, and in the VHL
tumour suppressor gene cause MEN 2 and VHL disease, respectively. To
further investigate the genetics of phaeochromocytoma predisposition, we
analysed three groups of patients with no evidence of VHL disease, MEN 2 or
NF1: Group A, eight kindreds with familial phaeochromocytoma; Group B, two
patients with isolated bilateral phaeochromocytoma; and Group C, six cases
of multiple extra- adrenal phaeochromocytoma or adrenal phaeochromocytoma
with a family history of neuroectodermal tumours. Germline missense VHL
mutations were identified in three of eight kindreds with familial
phaeochromocytoma. A germline VHL mutation was also characterised in one of
the two patients with bilateral phaeochromocytoma. No VHL or RET mutations
were detected in the final group of patients with multiple extra-adrenal
phaeochromocytoma or adrenal phaeochromocytoma with a family history of
neuroectodermal tumours. The absence of germline VHL and RET gene mutations
in many of these families suggested that other phaeochromoeytoma
susceptibility loci may exist. Glial cell line- derived neurotrophic factor
(GDNF) has been recently identified as a natural ligand for RET. Thus, it
seems plausible that GDNF is a good candidate gene to play a role in
phaeochromocytoma susceptibility. We searched for germline mutations in
GDNF in 16 cases of familial phaeochromocytoma (groups A, B and C) and
looked for evidence of somatic change in GDNF in 28 sporadic
phaeochromocytomas, 12 MEN 2 phaeochromocytomas and five VHL
phaeochromocytomas. No GDNF mutations were identified in patients with
familial phaeochromocytoma disease, but a c277C-->T (R93W) sequence
variant was identified in one of 28 sporadic tumours. This candidate
mutation was identified in the germline and tumour tissue but was not
present in 104 control GDNF alleles. GDNF sequence variants including R93W
have been suggested previously to represent low penetrance susceptibility
mutations for Hirschsprung disease and the R93W was not identified in 376
control alleles studied by others. These findings suggest that although
GDNF mutations do not appear to have a major role in the pathogenesis of
familial or sporadic phaeochromocytomas, allelic variation at the GDNF
locus may modify phaeochromocytoma susceptibility.
ARTICLES
Genetic predisposition to phaeochromocytoma: analysis of candidate genes GDNF, RET and VHL
Department of Pathology, Cambridge, UK.
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