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. 1999 Jul;65(1):68-76.
doi: 10.1086/302443.

Characterization of a germline mosaicism in families with Lowe syndrome, and identification of seven novel mutations in the OCRL1 gene

V Satre  1 , N Monnier, F Berthoin, C Ayuso, A Joannard, P S Jouk, I Lopez-Pajares, A Megabarne, H J Philippe, H Plauchu, M L Torres, J Lunardi
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Characterization of a germline mosaicism in families with Lowe syndrome, and identification of seven novel mutations in the OCRL1 gene

V Satre et al. Am J Hum Genet. 1999 Jul.

Abstract

The oculocerebrorenal syndrome of Lowe (OCRL) is an X-linked disorder characterized by major abnormalities of eyes, nervous system, and kidneys. Mutations in the OCRL1 gene have been associated with the disease. OCRL1 encodes a phosphatidylinositol 4, 5-biphosphate (PtdIns[4,5]P2) 5-phosphatase. We have examined the OCRL1 gene in eight unrelated patients with OCRL and have found seven new mutations and one recurrent in-frame deletion. Among the new mutations, two nonsense mutations (R317X and E558X) and three other frameshift mutations caused premature termination of the protein. A missense mutation, R483G, was located in the highly conserved PtdIns(4,5)P2 5-phosphatase domain. Finally, one frameshift mutation, 2799delC, modifies the C-terminal part of OCRL1, with an extension of six amino acids. Altogether, 70% of missense mutations are located in exon 15, and 52% of all mutations cluster in exons 11-15. We also identified two new microsatellite markers for the OCRL1 locus, and we detected a germline mosaicism in one family. This observation has direct implications for genetic counseling of Lowe syndrome families.

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