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ZIRC
ZFIN ID: ZDB-PUB-120111-34
The Lowe Syndrome Protein OCRL1 is Involved in Primary Cilia Assembly
Coon, B.G., Hernandez, V., Madhivanan, K., Mukherjee, D., Hanna, C.B., Ramirez, I.B., Lowe, M., Beales, P.L., and Aguilar, R.C.
Date: 2012
Source: Human molecular genetics 21(8): 1835-1847 (Journal)
Registered Authors: Lowe, Martin
Keywords: none
MeSH Terms:
  • Animals
  • Antigens/metabolism
  • Cell Line
  • Cells, Cultured
  • Cilia/metabolism*
  • Cilia/ultrastructure*
  • Disease Models, Animal
  • Embryo, Nonmammalian
  • Endosomes/metabolism
  • Humans
  • Interleukin-2 Receptor alpha Subunit/metabolism
  • Oculocerebrorenal Syndrome/genetics*
  • Oculocerebrorenal Syndrome/metabolism*
  • Oculocerebrorenal Syndrome/pathology
  • Phosphoric Monoester Hydrolases/deficiency
  • Phosphoric Monoester Hydrolases/genetics*
  • Phosphoric Monoester Hydrolases/metabolism*
  • Protein Transport
  • RNA, Small Interfering
  • Recombinant Fusion Proteins/metabolism
  • Signal Transduction
  • Zebrafish/embryology
PubMed: 22228094 Full text @ Hum. Mol. Genet.
FIGURES
ABSTRACT

Lowe syndrome is a devastating, X-linked genetic disease characterized by the presence of congenital cataracts, profound learning disabilities and renal dysfunction. Unfortunately, children affected with Lowe Syndrome often die early of health complications including renal failure. Although this syndrome was first described in the early 1950s and the affected gene, OCRL1, was identified more than 17 years ago, the mechanism by which Ocrl1 defects lead to Lowe syndrome’s symptoms remains unknown.

Here we show that Lowe syndrome display characteristics of a ciliopathy. Specifically, we found that patients’ cells have defects in the assembly of primary cilia and this phenotype was reproduced in cell lines by knock-down of Ocrl1. Importantly, this defect could be rescued by re-introduction of WT Ocrl1 in both, patient and Ocrl1 knock-down cells. In addition, a zebrafish animal model of Lowe syndrome exhibited cilia defects and multiple morphological and anatomical abnormalities typically seen in ciliopathies. Mechanistically, we show that Ocrl1 is involved in protein trafficking to the primary cilia in a Rab8-and IPIP27/Ses-dependent manner.

Taking into consideration the relevance of the signaling pathways hosted by the primary cilium, our results suggest hitherto unrecognized mechanisms by which Ocrl1 deficiency may contribute to the phenotypic characteristics of Lowe syndrome. This conceptual change in our understanding of the disease etiology may provide an alternative avenue for the development of therapies.

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