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. 1994 Jul;55(1):120–125.

Machado-Joseph Disease in Pedigrees of Azorean descent is Linked to Chromosome 14

P St George-Hyslop, E Rogaeva, J Huterer, T Tsuda, J Santos, J L Haines, K Schlumpf, E I Rogaev, Y Liang, D R Crapper McLachlan, J Kennedy, J Weissenbach, G D Billingsley, D W Cox, A E Lang, J R Wherrett
PMCID: PMC1918207  PMID: 8023841

Abstract

A locus for Machado-Joseph disease (MJD) has recently been mapped to a 30-cM region of chromosome 14q in five pedigrees of Japanese descent. MJD is a clinically pleomorphic neurodegenerative disease that was originally described in subjects of Azorean descent. In light of the nonallelic heterogeneity in other inherited spinocere-bellar ataxias, we were interested to determine if the MJD phenotype in Japanese and Azorean pedigrees arose from mutations at the same locus. We provide evidence that MJD in five pedigrees of Azorean descent is also linked to chromosome 14q in an 18-cM region between the markers D14S67 and AACT (multipoint lod score +7.00 near D14S81). We also report molecular evidence for homozy-gosity at the MJD locus in an MJD-affected subject with severe, early-onset symptoms. These observations confirm the initial report of linkage of MJD to chromosome 14; suggest that MJD in Japanese and Azorean subjects may represent allelic or identical mutations at the same locus; and provide one possible explanation (MJD gene dosage) for the observed phenotypic heterogeneity in this disease.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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