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Mutations are not uniformly distributed throughout the OCRL1 gene in Lowe syndrome patients.
Molecular Genetics and Metabolism 1998 May
Lowe syndrome (OCRL) is an X-linked disorder involving the eyes, kidney, and nervous system that is caused by loss of function in the OCRL1 gene. OCRL1 contains 24 exons (23 of which are coding) and encodes a 105-kDa enzyme with phosphatidylinositol 4,5 bisphosphate (PtdIns[4,5]P2) 5-phosphatase activity. We published previously (1,2) 13 different mutations in 10 families. Four are missense other 8 mutations in 10 families. Four are missense mutations in highly conserved PtdIns (4,5)P2 5-phosphatase caused by nonsense mutations, and three others are premature terminations caused by frameshift mutations. One frameshift, a GT deletion in exon 21, has been observed previously in two unrelated Lowe syndrome patients, suggesting that it may be a relative "hotspot" for mutation in a disorder marked otherwise by allelic heterogeneity. We have also seen two other recurrent mutations. One is a nonsense mutation CGA > TGA in exon 2 observed in two patients and the second is a missense mutation CGA > CAA in exon 15 present in two unrelated patients. These 21 distinct mutations we have found in 25 Lowe syndrome patients occur in only 9 of the 24 exons: 10, 12, 13, 14, 15, 18, 19, 21, and 22. Interestingly, missense mutations have occurred only in exons 12 through 15 in highly conserved residues among the phosphatidylinositol 5-phosphatases. These observations suggest useful strategies for mutation screening in OCRL.
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