Abstract:
:The disease locus for the clinically heterogeneous childhood spinal muscular atrophies (SMA) maps to the chromosome 5 subregion, 5q11.2-13.3. The beta-subunit of beta-D-N-acetylhexosaminidase (hexosaminidase) (EC 3.2.1.52) (Hex B) maps to the same region, and the protein required for substrate recognition by this enzyme, GM2-activator protein, likewise maps to chromosome 5. We have investigated the possibility of allelic variation among some forms of SMA and hexosaminidase deficiency. Recombination between the Hex B and SMA loci eliminates this enzyme as a candidate site for defects causing the illness. Furthermore, we show that, despite previous evidence to the contrary, the GM2-activator locus does not map to chromosome 5, thereby eliminating it as a candidate gene for SMA.
journal_name
Neurologyjournal_title
Neurologyauthors
Kleyn PW,Brzustowicz LM,Wilhelmsen KC,Freimer NB,Miller JM,Munsat TL,Gilliam TCdoi
10.1212/wnl.41.9.1418subject
Has Abstractpub_date
1991-09-01 00:00:00pages
1418-22issue
9eissn
0028-3878issn
1526-632Xjournal_volume
41pub_type
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