Abstract:
:Distal hereditary motor neuropathy (dHMN) or distal spinal muscular atrophy (OMIM #182960) is a heterogeneous group of disorders characterized by an almost exclusive degeneration of motor nerve fibers, predominantly in the distal part of the limbs. Silver syndrome (OMIM #270685) is a rare form of hereditary spastic paraparesis mapped to chromosome 11q12-q14 (SPG17) in which spasticity of the legs is accompanied by amyotrophy of the hands and occasionally also the lower limbs. Silver syndrome and most forms of dHMN are autosomal dominantly inherited with incomplete penetrance and a broad variability in clinical expression. A genome-wide scan in an Austrian family with dHMN-V (ref. 4) showed linkage to the locus SPG17, which was confirmed in 16 additional families with a phenotype characteristic of dHMN or Silver syndrome. After refining the critical region to 1 Mb, we sequenced the gene Berardinelli-Seip congenital lipodystrophy (BSCL2) and identified two heterozygous missense mutations resulting in the amino acid substitutions N88S and S90L. Null mutations in BSCL2, which encodes the protein seipin, were previously shown to be associated with autosomal recessive Berardinelli-Seip congenital lipodystrophy (OMIM #269700). We show that seipin is an integral membrane protein of the endoplasmic reticulum (ER). The amino acid substitutions N88S and S90L affect glycosylation of seipin and result in aggregate formation leading to neurodegeneration.
journal_name
Nat Genetjournal_title
Nature geneticsauthors
Windpassinger C,Auer-Grumbach M,Irobi J,Patel H,Petek E,Hörl G,Malli R,Reed JA,Dierick I,Verpoorten N,Warner TT,Proukakis C,Van den Bergh P,Verellen C,Van Maldergem L,Merlini L,De Jonghe P,Timmerman V,Crosby AH,Wagndoi
10.1038/ng1313keywords:
subject
Has Abstractpub_date
2004-03-01 00:00:00pages
271-6issue
3eissn
1061-4036issn
1546-1718pii
ng1313journal_volume
36pub_type
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