Abstract:
:Leber congenital amaurosis (LCA) is a blinding retinal disease that presents within the first year after birth. Using exome sequencing, we identified mutations in the nicotinamide adenine dinucleotide (NAD) synthase gene NMNAT1 encoding nicotinamide mononucleotide adenylyltransferase 1 in eight families with LCA, including the family in which LCA was originally linked to the LCA9 locus. Notably, all individuals with NMNAT1 mutations also have macular colobomas, which are severe degenerative entities of the central retina (fovea) devoid of tissue and photoreceptors. Functional assays of the proteins encoded by the mutant alleles identified in our study showed that the mutations reduce the enzymatic activity of NMNAT1 in NAD biosynthesis and affect protein folding. Of note, recent characterization of the slow Wallerian degeneration (Wld(s)) mouse model, in which prolonged axonal survival after injury is observed, identified NMNAT1 as a neuroprotective protein when ectopically expressed. Our findings identify a new disease mechanism underlying LCA and provide the first link between endogenous NMNAT1 dysfunction and a human nervous system disorder.
journal_name
Nat Genetjournal_title
Nature geneticsauthors
Koenekoop RK,Wang H,Majewski J,Wang X,Lopez I,Ren H,Chen Y,Li Y,Fishman GA,Genead M,Schwartzentruber J,Solanki N,Traboulsi EI,Cheng J,Logan CV,McKibbin M,Hayward BE,Parry DA,Johnson CA,Nageeb M,Finding of Rare Disdoi
10.1038/ng.2356subject
Has Abstractpub_date
2012-09-01 00:00:00pages
1035-9issue
9eissn
1061-4036issn
1546-1718pii
ng.2356journal_volume
44pub_type
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