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Published on: December 22, 2014
FAM161A, a novel centrosomal-ciliary protein implicated in autosomal recessive retinitis pigmentosa
1Institute of Human Genetics, University Regensburg, Franz-Josef-Strauss-Allee 11, 93053, Regensburg, Germany, frank.zach@klinik.uni-regensburg.de.
Abstract:
Retinitis pigmentosa (RP) is an inherited disease of the retina leading to vision impairment due to progressive photoreceptor cell death. Homozygous and compound heterozygous null mutations in the CRX-regulated FAM161A gene of unknown function were identified as a cause for autosomal recessive RP (RP28) in patients from India, Germany, Israel, the Palestinian territories, and the USA. The FAM161A protein has been found to be localized to the connecting cilium, the basal body, and the adjacent centriole in mammalian photoreceptors and was also present in synaptic layers and ganglion cells of the retina. In addition, FAM161A was shown to be part of microtubule-organizing centers in cultured cells and associates with the intracellular microtubule network. Moreover, FAM161A directly binds to microtubules and increases the acetylation of α-tubulin. An evolutionary highly conserved, C-terminal protein domain (UPF0564) of FAM161A was shown to mediate microtubule association, homo- and heterotypic interaction among UPF0564-containing proteins and binding to several ciliopathy-associated proteins. In summary, FAM161A is a novel centrosomal-ciliary protein that likely is implicated in the regulation of microtubule-based cellular processes in the retina.
Insights
Mutations in the FAM161A gene cause a form of inherited blindness called retinitis pigmentosa (RP28). This protein is crucial for retinal cell structure and function, particularly involving microtubules.
Area of Science:
- Ophthalmology
- Genetics
- Cell Biology
Background:
- Retinitis pigmentosa (RP) is a group of inherited retinal diseases characterized by progressive photoreceptor cell death and vision loss.
- Autosomal recessive RP (RP28) is linked to mutations in the FAM161A gene, whose function was previously unknown.
Purpose of the Study:
- To elucidate the function of the FAM161A protein in the retina.
- To understand the molecular mechanisms underlying RP28.
Main Methods:
- Localization studies of FAM161A protein in mammalian photoreceptors and other retinal cells.
- Investigation of FAM161A's association with cellular structures, including microtubules and centrosomes.
- Biochemical assays to determine FAM161A's interaction with microtubules and tubulin acetylation.
Main Results:
- FAM161A localizes to the connecting cilium, basal body, centriole, synaptic layers, and ganglion cells in the retina.
- FAM161A is a component of microtubule-organizing centers and directly binds to microtubules.
- FAM161A enhances α-tubulin acetylation, mediated by its conserved C-terminal UPF0564 domain.
Conclusions:
- FAM161A is a novel centrosomal-ciliary protein essential for retinal structure and function.
- The protein's interaction with microtubules suggests a role in regulating microtubule-based cellular processes critical for photoreceptor survival.
- Dysfunction of FAM161A contributes to the pathogenesis of retinitis pigmentosa (RP28).
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