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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Further localization of X-linked hydrocephalus in the chromosomal region Xq28.

X-linked hydrocephalus (HSAS) is the most frequent genetic form of hydrocephalus. Clinical symptoms of HSAS include hydrocephalus, mental retardation, clasped thumbs, and spastic paraparesis. Recently we have assigned the HSAS gene to Xq28 by linkage analysis. In the present study we used a panel of 18 Xq27-q28 marker loci to further localize the HSAS gene in 13 HSAS families of different ethnic origins. Among the Xq27-q28 marker loci used, DXS52, DXS15, and F8C gave the highest combined lod scores, of 14.64, 6.53 and 6.33, respectively, at recombination fractions of .04, 0, and .05, respectively. Multipoint linkage analysis localizes the HSAS gene in the telomeric part of the Xq28 region, with a maximal lod score of 20.91 at 0.5 cM distal to DXS52. Several recombinations between the HSAS gene and the Xq28 markers DXS455, DXS304, DXS305, and DXS52 confirm that the HSAS locus is distal to DXS52. One crossover between HSAS and F8C suggests that HSAS gene to be proximal to F8C. Therefore, data from multipoint linkage analysis and the localization of key crossovers indicate that the HSAS gene is most likely located between DXS52 and F8C. This high-resolution genetic mapping places the HSAS locus within a region of less than 2 Mb in length, which is now amenable to positional cloning.[1]


  1. Further localization of X-linked hydrocephalus in the chromosomal region Xq28. Willems, P.J., Vits, L., Raeymaekers, P., Beuten, J., Coucke, P., Holden, J.J., Van Broeckhoven, C., Warren, S.T., Sagi, M., Robinson, D. Am. J. Hum. Genet. (1992) [Pubmed]
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