Case#: Perrault_2012_Patient_FII1, male, 18 years of age at time of study, ethnicity not specified
CasePresentingHPOs: HP:0003577 (Congenital onset), HP:0000639 (Nystagmus), HP:0025573 (Mild myopia), HP:0007994 (Peripheral visual field loss), HP:0007663 (Reduced visual acuity), HP:0007814 (Retinal pigment epithelial mottling), HP:0000608 (Macular degeneration), HP:0000550 (Undetectable electroretinogram), HP:0010164 (Cone-shaped epiphyses of the toes), HP:0003774 (Stage 5 chronic kidney disease), HP:0002153 (Hyperkalemia), HP:0000113 (Polycystic kidney dysplasia), HP:0000556 (Retinal dystrophy), HP:0001396 (Cholestasis), HP:0010230 (Cone-shaped epiphyses of the phalanges of the hand)
CaseHPOFreeText: Photoattraction was listed as a phenotype. Acetylated alpha-tubulin staining in cultured fibroblasts showed an absence of primary cilia in a high number of cells from this patient.
CaseNotHPOs: HP:0004322 (Short stature), HP:0000773 (Short ribs), HP:0000900 (Thickened ribs), HP:0000929 (Abnormal skull morphology), HP:0040064 (Abnormality of limbs), HP:0001263 (Global developmental delay), HP:0004979 (Metaphyseal sclerosis)
CaseNotHPOFreeText: N/A
CasePreviousTesting: N/A
CaseMethod1: Ciliome resequencing of a customized target enrichment library (consisting of 1,666 genes)
CaseMethod2: Sanger sequencing of the 29 coding exons of IFT140
CaseGenotypingMethod: The patient was genotyped by ciliome resequencing of a customized target enrichment library (consisting of 1,666 genes), confirmed by Sanger sequencing of the 29 coding exons of IFT140
Variant: The patient is a compound heterozygote harboring the NM_014714.4(IFT140):c.932A>G (p.Tyr311Cys) and NM_014714.4(IFT140):c.857_860del (p.Ile286LysfsTer6) variants in IFT140.
ClinVar: 31681
CAID: CA129888
gnomAD: Neither variant was found in gnomAD.
VariantEvidence: Exogenous expression of the FLAG-tagged p.Tyr311Cys variant in the RPE1 (retinal pigment epithelial) cell line revealed an inability to co-localize with gamma-tubulin, indicating a defect in localization to the basal body in most cells, although milder than another suspected pathogenic missense variant (Figure 3A). The p.Ile286LysfsTer6) variant is a frameshift variant in exon 8 of 31, introducing a premature stop codon predicted to trigger nonsense-mediated decay or at least disrupt the C-terminal 81% of the protein product.
CaseAddInfo: The proband's parents are reportedly non-consanguineous.
CasePMIDs: N/A