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Ablation of retinal ciliopathy protein RPGR results in altered photoreceptor ciliary composition

Kollu N Rao1, Linjing Li1, Manisha Anand1

  • 1Department of Ophthalmology, University of Massachusetts Medical School, Worcester, MA 01605, USA.

Scientific Reports
|June 13, 2015
PubMed

Insights

Retinitis pigmentosa GTPase regulator (RPGR) protein is vital for photoreceptor cilia function. RPGR regulates soluble protein entry into cilia, impacting visual processing and preventing blindness disorders.

Area of Science:

  • Cell Biology
  • Genetics
  • Ophthalmology

Background:

  • Cilia are crucial for cellular functions, including photoreceptor phototransduction.
  • Mutations in RPGR (retinitis pigmentosa GTPase regulator) cause severe inherited blindness.
  • The exact role of RPGR in ciliary function remains largely unknown.

Purpose of the Study:

  • To investigate the role of RPGR in the trafficking of proteins within photoreceptor sensory cilia (PSC).
  • To analyze the protein composition of PSC in a mouse model lacking RPGR (Rpgr(ko)).

Main Methods:

  • Tandem mass spectrometry was employed to analyze PSC composition in Rpgr(ko) retinas.
  • Immunoblotting was used to validate proteomic findings.
  • Analysis focused on proteins involved in proteasomal and vesicular trafficking.

Main Results:

  • RPGR deficiency led to alterations in proteasomal and vesicular trafficking proteins in PSC before degeneration onset.
  • Levels of high molecular weight soluble proteins were altered in Rpgr(ko) PSC.
  • Key structural and phototransduction proteins remained unaffected in their trafficking.

Conclusions:

  • RPGR plays a regulatory role in the entry or retention of soluble proteins within photoreceptor cilia.
  • This function is distinct from the trafficking of essential structural and phototransduction proteins.
  • Findings offer insights into ciliopathies and photoreceptor degeneration mechanisms linked to RPGR mutations.

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