Table 1

Four different MKS3/TMEM67 mutations in five families with nephronophthisis (NPHP) and associated liver fibrosis

FamilyEthnic originNucleotide change†Deduced protein change†Exon (mutation)Parental consanguinityKidney (age at ESRF in years)EyeLiverOtherBrain
A1011Germanyc.869 G→Tp.W290L8, 18 (compound heterozygous)NoNPHP, Bx (8)Strabismus, nystagmusLiver fibrosisMild statomotoric retardation, no MRI
c.1843 T→Cp.C615R
F585Turkeyc.1843 T→Cp.C615R18 (homozygous)1stdegree cousinNPHP, Bx (6)Retinal degenerationLiver fibrosisMild cortical atrophy, normal cerebellum
F519Germanyc.1843 T→Cp.C615R18 (homozygous)NoNPHP, Bx (6)NADLiver fibrosisEhlers–Danlos syndromeNo neurological anomalies, no MRI
F563*Turkeyc.2461 G→Ap.G821S24 (homozygous)4th degree cousinNPHP (14)Normal fundusLiver fibrosisNo neurological anomalies, no MRI
NPHP Bx (10),Normal fundusLiver fibrosisNo neurological anomalies, normal MRI (fig 4)
NPHP (9)Normal fundusLiver fibrosisNo neurological anomalies, no MRI
F1039Germanyc.2461 G→Cp.G821R24 (homozygous)NoNPHP (10)AnisocoriaLiver fibrosisNormal MRI, PR
  • Bx, Kidney biopsy is compatible with the diagnosis of nephronophthisis; ESRF, end stage renal failure; MRI, magnetic resonance imaging; NAD, nothing abnormal detected; ND, no data; NPHP, nephronophthisis; PR, psychomotor retardation.

  • *Family has three affected siblings.

  • †Mutation numbering is based on MKS3/TMEM67 human reference sequence NM_153704.5, where +1 corresponds to the A of ATG start translation codon.

  • Novel mutations are highlighted in bold. All mutations were absent from at least 91 healthy control subjects.