PatientID: III-2

KindredID: 1

Case: M, 16Y0M, ethnicity unknown

DiseaseAssertion: VHL

FamilyInfo:  2 young male twins were examined with the VHL gene mutation with simultaneously manifesting hemangioblastomas of the right cerebellar hemisphere. Both parents were examined with no VHL mutation, detecting a de novo mutation in the twins. A third sibling, two years older, presented with a cafè au lait skin spot. Grand mother had bilateral high myopia and glaucoma. The medical history of the pedigree shows that member (I-1) had severe hypertension and died at 60 from a stroke, member (I-2) died at 40 from ovarian carcinoma, and member (I-3) died at 54 from clinically diagnosed intracerebral haemorrhage.

CasePresentingHPOs: HP:0006880; HP:0009713 (cerebellar hemangioblastoma, spinal hemangioblastoma)

CaseHPOFreeText: in 1994 patient came complaining of blurred vision thought to be due to his myopia. MRI showed a large cyst and a 4.3 cm mural ovoid nodule in the right cerebellar hemisphere. Another small mural nodule was present in the infero-posterolateral portion of the right cerebellar hemisphere. CT disclosed a round homogeneous, hyperintense nodule at T1 in the spinal cord. Raised intracranial pressure due to the compression of aqueduct from the tumour accounted for hydrocephalus and enlarged lateral and 3rd ventricles.

CaseNotHPOs: HP:0001901 (polycythemia)

CaseNotHPOFreeText: N/A

CasePreviousTesting: N/A

PreviouslyPublished: N/A

SupplementalData: N/A

Variant: p.N78S (c.233A>G)

CaseProblemVariantFreeText: N/A

LegacyVariant: p.N78S (c.446A>G)

ClinVarID: 93326 https://www.ncbi.nlm.nih.gov/clinvar/variation/93326/

CAID: N/A

gnomAD: N/A

VariantEvidence: N/A

MutationType: missense_variant; transition

CivicName: N/A

MultipleGeneVariants: N/A

PatientID: II-a

KindredID: 1

Case: F, 16Y0M, Greek

DiseaseAssertion: Assumed VHL

FamilyInfo: The patient’s 50-year-old father has VHL consisting of retinal HBs diagnosed at the age of 20 years. He also has spinal cord HBs located in the neck. He was also found to carry the mutation NM_000551.3:c.433C>T that the patient carried. The patient’s 18-year-old brother and her 20-year-old sister are phenotypically healthy and repeated biochemical evaluation and imaging studies are negative. Her paternal uncle, aunt and cousins are also phenotypically healthy with no indications from either biochemical or imaging studies as they denied further evaluation. In addition, her paternal grandfather of unknown genotype died at the age of 85 years while her paternal grandmother is alive and has no problems, being 86 years old at time of writing.

CasePresentingHPOs: HP:0009713; HP:0006880; HP:0009711; HP:0001737 (Spinal hemangioblastoma, cerebellar hemangioblastoma, retinal hemangioblastoma, pancreatic cyst)

CaseHPOFreeText: The 16Y female patient first presented with back pain, headaches, numbness, dizziness, weakness and pain in the arms and the legs at 12Y. A hemangioblastoma in the thoracic spine and a hemangioblastoma in the neck were found. A year later, at the age of 13, multiple HBs in the right and smaller lesions in the left eye were found. Two asymptomatic cysts (2 cm and 0.8 cm) in the body of the pancreas were also found. During her recent evaluation, at the age of 16 years, MRI imaging revealed a large HB extending from the cerebellum to the Th8 vertebrae, with extensive solid and cystic nodules inside the mass and increased dimensions of the spinal cord.

CaseNotHPOs: N/A

CaseNotHPOFreeText: N/A

CasePreviousTesting: N/A

PreviouslyPublished: N/A

SupplementalData: N/A

Variant: p.Q145*(c.433C>T)

LegacyVariant: N/A

ClinVarID: 625249, https://www.ncbi.nlm.nih.gov/clinvar/variation/625249/

gnomAD: N/A

VariantEvidence: It has been documented that dynamic organisation of pVHL–HIF1α recognition is focally centred on Gln145 within the L7 loop, and its tumourigenic mutant Q145H abolishes almost all of the correlated dynamic motions. In this report, Q145 is substituted by a stop codon, p.Q145X. This is a nonsense mutation resulting to a truncated VHL protein that lacks the last 68 amino acids and thus its function is abolished.

MutationType: stop_gained

CivicName: Q145*(c.433C>T)

MultipleGeneVariants: N/A