Abstract:
:Machado-Joseph disease (MJD) is an autosomal dominant neurodegenerative disorder that is clinically characterized by cerebellar ataxia and various associated symptoms. The disease is caused by an unstable expansion of the CAG repeat in the MJD gene. This gene is mapped to chromosome 14q32.1. To determine its genomic structure, we constructed a contig composed of six cosmid clones and eight bacterial artificial chromosome (BAC) clones. It spans approximately 300kb and includes MJD. We also determined the complete sequence (175,330bp) of B445M7, a human BAC clone that contains MJD. The MJD gene was found to span 48,240bp and to contain 11 exons. Northern blot analysis showed that MJD mRNA is ubiquitously expressed in human tissues, and in at least four different sizes; namely, 1.4, 1.8, 4.5, and 7.5kb. These different mRNA species probably result from differential splicing and polyadenylation, as shown by sequences of the 21 independent cDNA clones isolated after the screening of four human cDNA libraries prepared from whole brain, caudate, retina, and testis. The sequences of these latter clones relative to the MJD gene in B445M7 indicate that there are three alternative splicing sites and eight polyadenylation signals in MJD that are used to generate the differently sized transcripts.
journal_name
J Hum Genetjournal_title
Journal of human geneticsauthors
Ichikawa Y,Goto J,Hattori M,Toyoda A,Ishii K,Jeong SY,Hashida H,Masuda N,Ogata K,Kasai F,Hirai M,Maciel P,Rouleau GA,Sakaki Y,Kanazawa Idoi
10.1007/s100380170060keywords:
subject
Has Abstractpub_date
2001-01-01 00:00:00pages
413-22issue
7eissn
1434-5161issn
1435-232Xjournal_volume
46pub_type
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