Abstract
Various polymorphic markers with a random distribution along the X chromosome were used in a linkage analysis performed on a family with apparently Xlinked recessive inheritance of neural tube defects (NTD). The lod score values were used to generate an exclusion map of the X chromosome; this showed that the responsible gene was probably not located in the middle part of Xp or in the distal region of Xq. A further refining of these results was achieved by haplotype analysis, which indicated that the gene for X-linked NTD was located either within Xp21.1-pter, distal from the DMD locus, or in the region Xq12–q24 between DXS106 and DXS424. Multipoint linkage analysis revealed that the likelihood for gene location is highest for the region on Xp. The region Xq26–q28, which has syntenic homology with the segment of the murine X chromosome carrying the locus for ‘bent tail’ (Bn), a mouse model for X-linked NTD, is excluded as the location for the gene underlying X-linked NTD in the present family. Thus, the human homologue of the Bn gene and the present defective gene are not identical, suggesting that more than one gene on the X chromosome plays a role in the development of the neural tube.
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Hol, F.A., Geurds, M.P.A., Jensson, O. et al. Exclusion mapping of the gene for X-linked neural tube defects in an Icelandic family. Hum Genet 93, 452–456 (1994). https://doi.org/10.1007/BF00201674
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DOI: https://doi.org/10.1007/BF00201674