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Class I Phosphoinositide 3-Kinase Exerts a Differential Role on Cell Survival and Cell Trafficking in Retina.

Advances in experimental medicine and biology·2015
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SNAREs Interact with Retinal Degeneration Slow and Rod Outer Segment Membrane Protein-1 during Conventional and Unconventional Outer Segment Targeting.

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RD3 loss dictates high-risk aggressive neuroblastoma and poor clinical outcomes.

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Impaired association of retinal degeneration-3 with guanylate cyclase-1 and guanylate cyclase-activating protein-1 leads to leber congenital amaurosis-1.

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Retinal degeneration 3 (RD3) protein inhibits catalytic activity of retinal membrane guanylyl cyclase (RetGC) and its stimulation by activating proteins.

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RD3: a challenge and a promise.

Seifollah Azadi1

  • 1Department of Ophthalmology, University of Oklahoma Health Sciences Center (OUHSC), Oklahoma City, OK, 73104, USA.

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|February 14, 2015
PubMed
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The RD3 protein is crucial for trafficking essential proteins in photoreceptor cells, and its dysfunction causes retinal degeneration similar to Leber Congenital Amaurosis 12. Restoring RD3 shows promise for treating these blinding diseases.

Keywords:
Guanylate cyclase1LCA12Leber Congenital Amaurosis 1 (LCA1)Protein traffickingRetinaRetina degeneration3

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Area of Science:

  • Ophthalmology
  • Cell Biology
  • Genetics

Background:

  • Photoreceptor (PR) cells require daily renewal of outer segment (OS) membranes, necessitating efficient protein trafficking via the connecting cilium.
  • Retinal degeneration (rd3) causes a form of Leber Congenital Amaurosis (LCA12) due to mutations in the RD3 gene, leading to progressive vision loss.
  • The precise mechanism of membrane protein trafficking and its link to retinal degenerative diseases remain incompletely understood.

Purpose of the Study:

  • To investigate the function of the RD3 protein in photoreceptor outer segment membrane protein trafficking.
  • To identify interacting partners of RD3 and elucidate its role in the trafficking pathway.
  • To explore the therapeutic potential of RD3 for inherited retinal degenerative diseases.

Main Methods:

  • Generation of the first antibody against the RD3 protein.
  • Protein-protein interaction analysis to identify RD3 binding partners.
  • Detection of the major binding site between RD3 and its interacting protein.

Main Results:

  • RD3 protein directly interacts with guanylate cyclase 1 (GC1) and is partially expressed in the photoreceptor OS.
  • RD3 plays a direct role in the trafficking of GC1, regulating its transport and preventing excessive cGMP production.
  • Mutations in RD3 are associated with visual difficulties and symptoms similar to LCA1, suggesting a broader role in retinal diseases.

Conclusions:

  • RD3 is essential for the trafficking of GC1, a critical protein in photoreceptor function.
  • RD3 dysfunction contributes to retinal degeneration, highlighting its importance in maintaining vision.
  • RD3 represents a potential therapeutic target for inherited retinal degenerative diseases, including LCA12 and potentially LCA1.