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Lowe syndrome: Between primary cilia assembly and Rac1-mediated membrane remodeling.

Lowe syndrome (LS) is a lethal X-linked genetic disease caused by functional deficiencies of the phosphatidlyinositol 5-phosphatase, Ocrl1. In the past four years, our lab described the first Ocrl1-specific cellular phenotypes using dermal fibroblasts from LS patients. These phenotypes, validated in an ocrl1-morphant zebrafish model, included membrane remodeling (cell migration/spreading, fluid-phase uptake) defects and primary cilia assembly abnormalities. On one hand, our findings unraveled cellular phenotypes likely to be involved in the observed developmental defects; on the other hand, these discoveries established LS as a ciliopathy-associated disease. This article discusses the possible mechanisms by which loss of Ocrl1 function may affect RhoGTPase signaling pathways leading to actin cytoskeleton rearrangements that underlie the observed cellular phenotypes.

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