The NPHP1 gene deletion associated with juvenile nephronophthisis is present in a subset of individuals with Joubert syndrome

Melissa A. Parisi, Craig L. Bennett, Melissa L. Eckert, William B. Dobyns, Joseph G. Gleeson, Dennis W.W. Shaw, Ruth McDonald, Allison Eddy, Phillip F. Chance, Ian A. Glass

Research output: Contribution to journalArticlepeer-review

205 Scopus citations


Joubert syndrome (JS) is an autosomal recessive multisystem disease characterized by cerebellar vermis hypoplasia with prominent superior cerebellar peduncles (the "molar tooth sign" [MTS] on axial magnetic resonance imaging), mental retardation, hypotonia, irregular breathing pattern, and eye-movement abnormalities. Some individuals with JS have retinal dystrophy and/or progressive renal failure characterized by nephronophthisis (NPHP). Thus far, no mutations in the known NPHP genes, particularly the homozygous deletion of NPHP1 at 2q13, have been identified in subjects with JS. A cohort of 25 subjects with JS and either renal and/or retinal complications and 2 subjects with only juvenile NPHP were screened for mutations in the NPHP1 gene by standard methods. Two siblings affected with a mild form of JS were found to have a homozygous deletion of the NPHP1 gene identical, by mapping, to that in subjects with NPHP alone. A control subject with NPHP and with a homozygous NPHP1 deletion was also identified, retrospectively, as having a mild MTS and borderline intelligence. The NPHP1 deletion represents the first molecular defect associated with JS in a subset of mildly affected subjects. Cerebellar malformations consistent with the MTS may be relatively common in patients with juvenile NPHP without classic symptoms of JS.

Original languageEnglish (US)
Pages (from-to)82-91
Number of pages10
JournalAmerican Journal of Human Genetics
Issue number1
StatePublished - Jul 2004
Externally publishedYes

Bibliographical note

Funding Information:
We thank the patients and their families, for generously donating DNA samples and clinical information, and the Joubert Syndrome Foundation, for support of this research. M.A.P. is supported by National Institutes of Health grant K23 NS45832. We acknowledge Richard Peet and Huy Huynh,for cell-culture expertise and technical assistance, and KarenBarnett, for coordinating the genetic studies.


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