Von Hippel-Lindau (VHL) is a tumor suppressor that negatively regulates the production of angiogenic factors. Mutations in the VHL gene cause VHL syndrome, which is characterized by highly vascularized tumors. Here we report a c.464T>A mutation of the VHL gene in three patients with hemangioblastoma from a Chinese family. This mutation was not reported previously and was absent in the unaffected family members. The mutation is predicted to cause Val to Glu substitution at VHL protein residue 155 in a conserved region. Previous biochemical studies demonstrated that residue Val-155 was critical for VHL protein binding to chaperonin TRiC/CCT, an essential step for proper VHL protein folding. Our finding of naturally occurring VHL V155E mutation in patients with VHL syndrome supports the functional importance of Val-155 residue in VHL protein and illustrates the diversity of VHL gene defects underlying VHL syndrome.
PatientID: III-1
KindredID: 1
Case: F, 26Y0M, Chinese
DiseaseAssertion: assumed VHL
FamilyInfo: 10 members of this Chinese family were tested, and 3 were found with the same genetic mutation (c.464T>A). The proband’s grandmother (I-1, 79Y), and father (II-1, 53Y) had hemangioblastomas, and tested positive for the mutation. This mutation was not found in the other unaffected members in the family.
CasePresentingHPOs: HP:0006880; HP:0030405; HP:0002666 (cerebellar hemangioblastoma, endolyphmatic sac tumor, pheochromocytoma)
CaseHPOFreeText: patient suffered with dizziness and headache and frequent vomiting since 25Y (CT and MRI identified occupying lesions and obstructive hydrocephalus in the cerebellar vermis). The cerebellar tumor nodes were removed surgically. Abdominal CT showed multiple lesions in the liver, pancreas and posterior peritoneum. The tumors in the proband’s pancreatic tail and retroperitoneal space also were removed subsequently. Histological analysis indicated the tumors to be pancreatic isletcell tumor and phaeochromocytoma, respectively.
CaseNotHPOs: N/A
CaseNotHPOFreeText: patient was negative in the bilateral Babinski’s sign test
CasePreviousTesting: N/A
PreviouslyPublished: N/A
SupplementalData: N/A
Variant: p.V155E (c.464T>A)
LegacyVariant: N/A
CaseProblemVariantFreeText: N/A
ClinVarID: N/A
CAID: CA351756032 https://reg.clinicalgenome.org/redmine/projects/registry/genboree_registry/allele?hgvsOrDescriptor=NM_000551.3%3Ac.464T%3EA
gnomAD: N/A
VariantEvidence: N/A
MutationType: missense_variant;transversion
CivicName: V155E (c.464T>A)
MultipleGeneVariants: N/A