Usher syndrome and Leber congenital amaurosis are molecularly linked via a novel isoform of the centrosomal ninein-like protein.

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Publication year
2009Source
Human Molecular Genetics, 18, 1, (2009), pp. 51-64ISSN
Publication type
Article / Letter to editor

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Organization
Human Genetics
Ophthalmology
Otorhinolaryngology
Journal title
Human Molecular Genetics
Volume
vol. 18
Issue
iss. 1
Page start
p. 51
Page end
p. 64
Subject
DCN 2: Functional Neurogenomics; DCN 3: Neuroinformatics; NCMLS 6: Genetics and epigenetic pathways of diseaseAbstract
Usher syndrome (USH) and Leber congenital amaurosis (LCA) are autosomal recessive disorders resulting in syndromic and non-syndromic forms of blindness. In order to gain insight into the pathogenic mechanisms underlying retinal degeneration, we searched for interacting proteins of USH2A isoform B (USH2A(isoB)) and the LCA5-encoded protein lebercilin. We identified a novel isoform of the centrosomal ninein-like protein, hereby named Nlp isoform B (Nlp(isoB)), as a common interactor. Although we identified the capacity of this protein to bind calcium with one of its three EF-hand domains, the interacton with USH2A(isoB) did not depend on this. Upon expression in ARPE-19 cells, recombinant Nlp(isoB), lebercilin and USH2A(isoB) were all found to co-localize at the centrosomes. Staining of retinal sections with specific antibodies against all three proteins revealed their co-localization at the basal bodies of the photoreceptor-connecting cilia. Based on this subcellular localization and the nature of their previously identified binding partners, we hypothesize that the pathogenic mechanisms for LCA and USH show significant overlap and involve defects in ciliogenesis, cilia maintenance and intraflagellar and/or microtubule-based transport. The direct association of Nlp(isoB) with USH2A(isoB) and lebercilin indicates that Nlp can be considered as a novel candidate gene for USH, LCA and allied retinal ciliopathies.
This item appears in the following Collection(s)
- Academic publications [227425]
- Electronic publications [107141]
- Faculty of Medical Sciences [86157]
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