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Vol. 91, No. 1-4, 2000
Issue release date: 2000

Cloning and characterization of the breakpoint regions of a chromosome 11;18 translocation in a patient with hamartoma of the retinal pigment epithelium

Kutsche K. · Glauner E. · Knauf S. · Pomarino A. · Schmidt M. · Schröder B. · Nothwang H.G. · Schüler H.M. · Goecke T.O. · Kersten A.J. · Althaus C. · Gal A.
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Abstract

Mutations of various tumor suppressor genes, e.g., PTEN, TSC1, and TSC2, are known to be responsible for different inherited diseases presenting with multiple hamartomas, a benign tumor resembling neoplasia that results from faulty organ development. Combined hamartoma of the retinal pigment epithelium (RPE) and retina is a rare, congenital, focal malformation of the fundus. So far, no disease gene has been associated with this disorder. By molecular analysis of an apparently balanced and reciprocal translocation between the short arms of chromosomes 11 and 18, t(11;18)(p13;p11.31), in a patient with hamartoma of the RPE and retina, we selected PAC clones crossing the breakpoints on both derivative chromosomes 11 and 18. For the overlapping chromosome 11 clone, two EST clusters were identified, suggesting the existence of at least two genes in the breakpoint region. We constructed a PAC contig and showed that at least three exons of a novel gene map to the breakpoint region on chromosome 18. Based on the results of FISH analysis with the PAC clones of this contig, we suggest the occurrence of a complex rearrangement.   



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