PatientID: 19
KindredID: C
Case: Sex Unknown, 30Y0M, Mexican (Latino/Admixed American)
DiseaseAssertion: assumed VHL
FamilyInfo: At least 13 members in this family presented with the mutation. 5 were asymptomatic (ages 9, 12, 13, 17, and 29Y). Other family manifestations include: cerebellar, spinal, retinal HBs, pancreatic, hepatic, suprarenal and kidney cysts, epididymal cystadenoma, and RCC. Fig 1 displays family pedigree.
CasePresentingHPOs: HP:0009713 (spinal hemangioblastoma)
CaseHPOFreeText: Patient had 2 spinal HBs. They however appeared absent of clinical manifestations of VHL disease prior to clinical and imaging scrutiny.
CaseNotHPOs: N/A
CaseNotHPOFreeText: N/A
CasePreviousTesting: N/A
PreviouslyPublished: 20064270 (Here, the family cohort is given with a reportedly different variant of: p.G34Rfs*98 (c.99_100insA). Unclear of why this is or which most correctly corresponds to the family).
SupplementalData: N/A
Variant: p.T100Nfs*32 (c.298dupA)
LegacyVariant: c.1012_1013insA
CaseProblemVariantFreeText: The ‘1012_1013insA’ mutation is out-of-frame, leading to a modification of 31 amino acids downstream and a premature stop codon at nucleotides 5441-5443 (amino acid residue 131).
ClinVarID: N/A
CAID: CA2573129737 https://reg.clinicalgenome.org/redmine/projects/registry/genboree_registry/allele?hgvsOrDescriptor=NM_000551.3%3Ac.298dupA
gnomAD: N/A
VariantEvidence: The modified amino acids are located in a domain common to all pVHL isoforms, the highly conserved cctbinding domain of the protein, involved in the formation of the pVHL elongin complex that is crucial for tumor suppression. Furthermore, the mutant protein is prematurely truncated and lacks the C-terminal half of exon 2 and exon 3 completely, which includes the nuclear export signal and the elongin C binding site of pVHL. Thus, this truncated protein would affect the two functional isoforms of pVHL: the major isoform pVHL30 and pVHL19, but not isoform 2, which lacks exon 2 but is not functional
MutationType: plus_1_frameshift_variant; duplication
CivicName: T100Nfs*32 (c.298dupA)
MultipleGeneVariants: N/A