New gene implicated in causing AD-HSP

BACKGROUND: Hereditary spastic paraplegia (HSP) is a group of inherited neurodegenerative disorders with the shared characteristics of slowly progressive spasticity and weakness of the lower limbs. Thirteen loci for autosomal dominant HSP have been mapped.

METHODS: A Chinese family with HSP was found in the Shandong province and Inner Mongolia Autonomous Region of China and genomic DNA of all 19 family members was isolated. After exclusion of known autosomal dominant loci, a genome wide scan and linkage analysis were performed.

RESULTS: The known autosomal dominant loci of SPG3A, SPG4, SPG6, SPG8, SPG9, SPG10, SPG12, SPG13, SPG17, SPG19, SPG29, SPG31 and SPG33 were excluded by linkage analysis. The results of a genome wide scan demonstrated candidate linkage to a locus on chromosome 11p14.1-p11.2, over an 18.88 cM interval between markers D11S1324 and D11S1933. A maximal, two point LOD score of 2.36 for marker D11S935 at a recombination fraction (theta) of 0 and a multipoint LOD score of 2.36 for markers D11S1776, D11S1751, D11S1392, D11S4203, D11S935, D11S4083, and D11S4148 at theta = 0, suggest linkage to this locus.

CONCLUSION: The HSP neuropathy in this family may represent a novel genetic entity, which will facilitate discovery of this causative gene.


Chin Med J (Engl). 2008 Mar 5;121(5):430-4.
A novel candidate locus on chromosome 11p14.1-p11.2 for autosomal dominant hereditary spastic paraplegia.
Zhao GH, Hu ZM, Shen L, Jiang H, Ren ZJ, Liu XM, Xia K, Guo P, Pan Q, Tang BS.
Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China.