Abstract
Hereditary spastic paraplegia (HSP) is a neurodegenerative condition defined clinically by lower limb spasticity and weakness. Homozygous mutations in CYP7B1 have been identified in several consanguineous families that represented HSP type 5 (SPG5), one of the many genetic forms of the disease. We used direct sequencing and multiplex ligation-dependent probe amplification to screen for CYP7B1 alterations in apparently sporadic HSP patients (n = 12) as well as index patients from non-consanguineous families with recessive (n = 8) and dominant (n = 8) transmission of HSP. One sporadic patient showing HSP as well as optic atrophy carried a homozygous nonsense mutation. Compound heterozygosity was observed in a recessive family with a clinically pure phenotype. A heterozygous missense change segregated in a small dominant family. We also found a significant association of a known coding polymorphism with cerebellar signs complicating a primary HSP phenotype. Our findings suggest CYP7B1 alterations to represent a rather frequent cause of HSP that should be considered in patients with various clinical presentations.
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Acknowledgements
The authors thank the patients for participating and K. Stein for excellent technical assistance. This study was supported by the Deutsche Forschungsgemeinschaft (BE 4069/1-1 to C.B.) and the German Ministry for Education and Research (01GM0603 GeNeMove). All experiments reported in this study comply with the current laws of the country in which they were performed.
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Previous genetic screens on primary cohort patients (DOC 35.0 KB)
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Schüle, R., Brandt, E., Karle, K.N. et al. Analysis of CYP7B1 in non-consanguineous cases of hereditary spastic paraplegia. Neurogenetics 10, 97–104 (2009). https://doi.org/10.1007/s10048-008-0158-9
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DOI: https://doi.org/10.1007/s10048-008-0158-9