JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
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Co-Expression of Wild-Type and Mutant S163R C1QTNF5 in Retinal Pigment Epithelium.

The pathogenic mutation S163R in C1QTNF5 causes a disorder known as autosomal dominant late-onset retinal degeneration (L-ORD), characterized by the presence of thick extracellular sub-RPE deposits, similar histopathologically to those found in AMD patients. We have previously shown that the S163R C1QTNF5 mutant forms globular aggregates within the RPE in vivo following its AAV-mediated expression in the RPE and exhibits a reversely polarized distribution, being routed toward the basal rather than apical RPE. We show here that when both wild-type and mutant S163R C1QTNF5 are simultaneously delivered subretinally to mouse RPE cells, the mutant impairs the wild-type protein secretion from the RPE, and both proteins are dispersed toward the basal and lateral RPE membrane. This result has mechanistic and therapeutic implications for L-ORD disorder.

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