PatientID: II-1

KindredID: 1

Case: M, 57Y0M, Ethnicity Unknown

DiseaseAssertion: VHL

FamilyInfo: Family in India but Ethnicity not explicitly confirmed. Two children with the same mutation. Eldest son presented at age 10 with severe hypertension and bilateral pheochromocytoma. Daughter presented at age 17 with palpitation, blurred vision, blurring vision, bilateral papilledema and bilateral pheochromocytoma. Wife and brother were negative for the mutation.

CasePresentingHPOs: HP:0000822; HP:0002666; HP:0006748; HP:0002315; HP:0001250; HP:0031657 (Hypertension, Pheochromocytoma, Adrenal pheochromocytoma, Headache, Seizure, Abnormal heart sound)

CaseHPOFreeText: Presented at 14 years-old with severe hypertension. On evaluation he was found to have a right adrenal mass with elevated urinary VMA, confirming the diagnosis of a right adrenal pheochromocytoma. Presented at age 22 with severe headache and recurrent seizures. Cardiac auscultation revealed a loud 2nd heart sound and a 3rd heart sound. Examination of the abdomen revealed a palpable mass in the left hypochondrium. This mass was confirmed as a pheochromocytoma. Asymptomatic at age 57.

CaseNotHPOs: HP:0030148 (Heart murmur)

CaseNotHPOFreeText: There were no heart murmurs during evaluation at age 22.

CasePreviousTesting: N/A

PreviouslyPublished: N/A

SupplementalData: Figure 1

Variant: p.R82L (c.245G>T)

LegacyVariant: N/A

CaseProblemVariantFreeText: N/A

ClinVarID: 526675, https://www.ncbi.nlm.nih.gov/clinvar/variation/526675/

CAID: N/A

gnomAD: N/A

VariantEvidence: Authors carried out analysis of VHL variant p.Arg82Leu with six different in silico tools namely SIFT, I-Mutant3, PhD-SNP, MutPred, PolyPhen2 and SNPs&GO in order to determine the pathogenic potential of the variant.

MutationType: missense_variant;transversion

CivicName: R82L (c.245G>T)

MultipleGeneVariants: N/A

PatientID: None

KindredID: 1

Case: F, 24Y0M, Ethnicity Unknown

DiseaseAssertion: Assumed VHL

FamilyInfo: Third child of healthy unrelated parents; she has two healthy older sisters.

CasePresentingHPOs: HP:0001511; HP:0001999; HP:0000952; HP:0001943; HP:0001508; HP:0000851; HP:0001250; HP:0002650; HP:0001332; HP:0001263; HP:0006880 (Intrauterine growth retardation, Abnormal facial shape, Jaundice, Hypoglycemia, Failure to thrive, Congenital hypothyroidism, Seizure, Scoliosis, Dystonia, Global developmental delay, Cerebellar hemangioblastoma)

CaseHPOFreeText: Normally born after 37 weeks pregnancy. During the prenatal period, she showed intrauterine growth retardation of unknown cause. At birth, dysmorphic features were noted (full list in table 1). After birth, she was treated for physiological jaundice and hypoglycemia. In addition, she has problem for failure to thrive and feeding difficulties associated with poor sucking and regurgitation. Furthermore, she was diagnosed with a congenital hypothyroidism in the neonatal screening. At 26 months old, she developed epilepsy. At 7Y, was considered to have Rett syndrome because of stereotypic hand movements since 2 years old, scoliosis and dystonia. Her psychomotor development was severely delayed: she had no ability to move by herself, visual contact, or social interaction. Brain MRI was performed at 1 year old and 6 years old. Both of these showed no abnormal findings. At 16 years old, follow-up MRI unexpectedly demonstrated a solid tumor with peritumoral edema at right cerebellum; diagnosed a cerebellar hemangioblastoma and confirmed through histopathology.

CaseNotHPOs: HP:0002012 (Abnormality of the abdominal organs)

CaseNotHPOFreeText: Repeat brain MRI, fundoscopy, abdominal echography and CT, blood and urine testing revealed no other tumors associated with VHL.

CasePreviousTesting: N/A

PreviouslyPublished: N/A

SupplementalData: N/A

Variant: Complete Deletion

LegacyVariant: N/A

CaseProblemVariantFreeText: N/A

ClinVarID: N/A

CAID: N/A

gnomAD: N/A

VariantEvidence: No mutation was detected in MECP2 on chromosome Xq28. At 5 months old, her chromosome analysis of the white blood cells revealed a distal deletion of the short arm of chromosome 3. Genomic DNA from the patient and her parents revealed a de novo 11.0-Mb deletion at 3p26.3-25.3 that included VHL and a paternally inherited 740-kb gain at Xp22.2-22.13, which was predicted to be a benign copy number variation. Unfortunately, since the mutation analysis of VHL was not performed using resected tumor tissues in the present case, “the second hit” could not be confirmed. Thus, the reason remains unclear why a cerebellar hemangioblastoma developed in her.

MutationType: deletion

CivicName: 3p26.3-25.3 11Mb del

MultipleGeneVariants: see VariantEvidence.