Abstract
Familial hemiplegie migraine (FHM) is an autosomal dominant subtype of migraine with attacks, associated with transient episodes of hemiparesis. One of the genes for FHM has been assigned to chromosome 19p13. Detailed analysis of critical recombinants from two different chromosome 19-linked FHM families, using new markers indicated a 6-cM candidate region on 19p13.1–p13.2 flanked by loci D19S394 and D19S226. Another paroxysmal neurological disorder, episodic ataxia type 2 (EA-2), has also been linked to the same chromosomal region. Most of the interval was completely covered by YAC and cosmid contigs; the physical map yielded approximately 3 Mb encompassing several genes including the protein kinase substrate 80K-H (PRKCSH) gene. Since PRKCSH is involved in neuronal signal transduction, it was considered to be an FHM candidate gene. The genomic structure of this gene was established and mutation analysis for all exon and flanking intron sequences was performed in FHM- and EA-2-affected individuals. Five polymorphisms were identified, including a trinucleotide repeat length variation in the coding sequence. However, no potential disease causing mutation was found and therefore the PRKCSH gene can be excluded for both FHM and EA-2.
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Acknowledgements
We thank Dr. M. Ferrari (Milan, Italy), Dr. S. Peroutka (Menlo Park, Calif., USA), Dr. K.M.A. Welch (Detroit, Mich., USA) for providing DNA samples of several FHM families.
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Ophoff, R.A., Terwindt, G.M., Vergouwe, M.N. et al. A 3-Mb Region for the Familial Hemiplegic Migraine Locus on 19p13.1–p13.2: Exclusion of PRKCSH as a Candidate Gene. Eur J Hum Genet 4, 321–328 (1996). https://doi.org/10.1159/000472226
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DOI: https://doi.org/10.1159/000472226
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