SPG11 mutations are common in familial cases of complicated hereditary spastic paraplegia
C Paisan-Ruiz1, O Dogu, A Yilmaz
1Molecular Genetics Unit, National Institute on Aging, National Institutes of Health, 35 Lincoln Drive, Building 35, Room 1A1015, Bethesda, MD 20824, USA. C.Paisan-Ruiz@ion.ucl.ac.uk
Background:
Autosomal recessive hereditary spastic paraplegia (ARHSP) with thin corpus callosum (TCC) is a common form of complex hereditary spastic paraplegia. The genetic lesion underlying ARHSP-TCC was localized to chromosome 15q13-q15 and given the designation SPG11. Recently, the gene encoding spatacsin (KIAA1840) has been shown to contain mutations that underlie the majority of ARHSP-TCC cases.
Methods:
We present a complete analysis of the 40 coding exons of this gene in patients with sporadic (n = 25) or familial (20 probands) complex hereditary spastic paraplegia with and without thinning of the corpus callosum.
Results:
We identified seven mutations, including deletions, insertions, and nonsense mutations, which were all predicted to lead to premature truncation of the protein.
Conclusion:
We conclude that mutations on KIAA1840 are frequent in complex autosomal recessive hereditary spastic paraplegia but an infrequent cause of sporadic complex hereditary spastic paraplegia.
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