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Ophthalmic Genet. 2016 Sep;37(3):290-3. doi: 10.3109/13816810.2015.1066830. Epub 2016 Feb 8.

C8orf37 is mutated in Bardet-Biedl syndrome and constitutes a locus allelic to non-syndromic retinal dystrophies.

Author information

1
a Eye Institute , Cleveland Clinic Abu Dhabi , Abu Dhabi , UAE.
2
b Division of Pediatric Ophthalmology , King Khaled Eye Specialist Hospital , Riyadh , Saudi Arabia.
3
c Center for Human Genetics, Bioscientia , Ingelheim , Germany.
4
d Institute of Human Genetics , University of Cologne , Cologne , Germany.
5
e Department of Medicine , University of Freiburg Medical Center , Freiburg , Germany.

Abstract

Bardet-Biedl syndrome (BBS) is a pleiotropic and clinically and genetically heterogeneous ciliopathy. Primary features are early-onset retinal dystrophy that is typically rod-cone, obesity, polydactyly, renal abnormalities, hypogonadism, and learning difficulties, but most patients do not present with the full clinical picture. In a BBS patient from a consanguineous marriage we performed next-generation sequencing targeting all known BBS genes and other genes known or hypothesized to cause ciliopathies. While no mutation was present in any of the recognized genes for BBS, we were able to identify the homozygous non-conservative mutation c.529C>T (p.Arg177Trp) in C8orf37 that segregated with the phenotype, affects an evolutionarily highly conserved residue, and is bioinformatically predicted to be pathogenic. The same mutation has been described in unrelated patients with non-syndromic cone-rod dystrophy and other C8orf37 changes were found in individuals with retinitis pigmentosa. We conclude that C8orf37 should be added to BBS screening panels as a probable rare cause of the disease and that individuals with C8orf37-related retinal dystrophy should be screened for BBS features.

KEYWORDS:

Bardet-Biedl syndrome (BBS); C8orf37; cilia/ciliopathies; cone-rod dystrophy; pleiotropy; retinitis pigmentosa (RP)

PMID:
26854863
DOI:
10.3109/13816810.2015.1066830
[Indexed for MEDLINE]

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