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Donna S. Mackay, Louise A. Ocaka, Arundhati Dev Borman, Panagiotis I. Sergouniotis, Robert H. Henderson, Phillip Moradi, Anthony G. Robson, Dorothy A. Thompson, Andrew R. Webster, Anthony T. Moore; Screening of SPATA7 in Patients with Leber Congenital Amaurosis and Severe Childhood-Onset Retinal Dystrophy Reveals Disease-Causing Mutations. Invest. Ophthalmol. Vis. Sci. 2011;52(6):3032-3038. doi: https://doi.org/10.1167/iovs.10-7025.
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© ARVO (1962-2015); The Authors (2016-present)
To investigate the prevalence of sequence variants in the gene SPATA7 in patients with Leber congenital amaurosis (LCA) and autosomal recessive, severe, early-onset retinal dystrophy (EORD) and to delineate the ocular phenotype associated with SPATA7 mutations.
Patients underwent standard ophthalmic evaluation after providing informed consent. One hundred forty-one DNA samples from patients with LCA and EORD had been analyzed for mutations by using a microarray, with negative results. One additional patient underwent SPATA7 screening due to a region of autozygosity surrounding this gene. A further patient was screened who had a compatible ocular phenotype. The entire SPATA7 coding sequence was assayed, including the intron–exon junctions, by using a combination of direct DNA sequencing and high-resolution melting screening.
Screening of SPATA7 identified several known and novel single-nucleotide polymorphisms (SNPs). Affected individuals from five unrelated families were identified to have coding changes. Clinical features demonstrated a severe infantile onset retinal dystrophy, similar to Leber congenital amaurosis. The retina had widespread retinal pigment epithelial atrophy, with minimal pigment migration into the neurosensory retina. Fundus autofluorescence imaging showed a parafoveal annulus of increased autofluorescence. High-definition optical coherence tomography showed preservation of the inner segment/outer segment junction at the fovea.
Mutations in SPATA7 are a rare cause of childhood retinal dystrophy accounting for 1.7% of disease in this cohort. Affected patients present in infancy with severe visual loss, but may have some preservation of the photoreceptor structure in the central retina.
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