A rapid detection system for cryptic rearrangements in idiopathic mental retardation Mental retardation(Mr)Occurs in 2 3% of the general population, and more than half of mr patients are categorised as idiopathic that Is, the cheap ralph lauren cause is unknown.1, 2 Patients with idiopathic MR are presumed to be affected with certain genetic disorders or undetectable chromosomal abnormalities. Comprise about half of segmental aneusomies, 3 and are one of the major causes of mr.4, 5 A recent review showed that subtelomeric rearrangements were detected in 131(5.1%)Of 2585 children with mr.1, 4 6 Conventional cytogenetic analysis can detect many, but not all, rearrangements, depending on its powers of resolution.4 Other methods, such as fluorescent in situ hybridisation(Fish)Using a complete set of subtelomeric probes, multicolourin situ labelling, and genotyping have been designed to detect subtelomeric rearrangements, but none of them is ideal in terms Of sensitivity and/or efficiency.4, 6 Microarray based CGH is a promising, high throughput method of detecting subtelomeric rearrangements.4 Veltman et al recently reported a microarray CGH system using crude bacterial/plasmid derived artificial chromosome(Bac/pac)Dna for the Analysis of subtelomeric aberrations, and suggested that degenerate oligonucleotide primed(Dop)Pcr products could also be Used instead of crude clone dna, although the performance of dop pcr products might be less sensitive.7 We have developed a microarray CGH system to identify rearrangements involving a subtelomeric region, using DOP PCR that Amplifies subtelomeric bac/pac dna.The sequence of dop a is the same as that Of 6mw by telenius et al.9 Two otherPrimers were randomly designed and confirmed as capable of amplifying clone DNAs as effectively as DOP A.Primers Were purchased from hokkaido system science co ltd(Sapporo, japan).Dop pcr was performed in a 100 l cocktail containing 50 ng BAC/PAC DNA, 1 mol/l of a DOP primer, 3 mmol/l MgCl2, 200 mmol/l of each dNTP, 1 ExTaq buffer(Takara bio, ohtsu, japan), and 0.5 U ExTaqHS enzyme(Takara bio).Pcr was cycled 30 times at 94c for 30 seconds, at linear ramping of 37 72c over 10 minutes, and At 72c for 1 minute.Successfully amplified pcr products, usually 0.2 2 kb in size, were used for subsequent experiments. Using dop a, dop b, or dop c, each pcr product(100 l)Was mixed with the same volume(300 l)Of 4print buffer(1 mol/l Sodium phosphate/0.001% N lauroyl sarcosine, pH 8.5)And concentrated to a final volume of 30 l using microcon 100(Millipore, bedford, ma, usa). The products were mixed with dmso and ddh2o to a final concentration of 1print buffer/20% dmso and were ready for prints. Genomic dna from 69 cases of idiopathic mr, whose karyotype was normal by g banding chromosome analysis at the 400 band level, Was analysed. We also used dna from five patients ralph lauren UK with whs(Whs1 5), who had been diagnosed as having various deletions for distal 4p, as Positive controls to examine the reliability of the microarray cgh ralph lauren uk online system described below(Table 2), and that from normal Controls as reference dna for the system. Each product was spotted in triplicate onto codelink activated slides(Amersham bioscience, buckinghamshire, uk)Using stampman(Nippon laser and electronics laboratory, nagoya, Japan)With a centre to centre distance of 1 mm between adjacent spots.The same triplicate spots were printed twice to block

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