A YAC contig across the fragile X site defines the region of fragility. |
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| Authors: | M C Hirst K Rack Y Nakahori A Roche M V Bell G Flynn Z Christadoulou R N MacKinnon M Francis and A J Littler |
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| Affiliation: | Institute of Molecular Medicine, John Radcliffe Hospital, Oxford, UK. |
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| Abstract: | The fragile X syndrome is a common cause of mental retardation and is associated with a fragile site at Xq27.3 (FRAXA). Recently, evidence has been presented for the role of methylation and genomic imprinting in the expression of the disease. We have identified a site of methylation in patients by long range restriction mapping of the region. In this paper we present a YAC contig of this area, localise the CpG sequences which are methylated, and show by in situ hybridisation that the site of fragility lies within this region. |
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