New VAPB deletion variant and exclusion of VAPB mutations in familial ALS

Landers, J E, Leigh, Nigel and et al, (2008) New VAPB deletion variant and exclusion of VAPB mutations in familial ALS. Neurology, 70 (14). pp. 1179-85. ISSN 1526-632X

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Abstract

OBJECTIVE

Amyotrophic lateral sclerosis (ALS) is a progressive, neurodegenerative disorder involving upper and lower motor neurons. The vesicle-associated membrane protein B (VAPB) gene has been genetically linked to ALS in several large Brazilian families in which the disorder is caused by a proline to serine mutation at codon 56 (P56S). No additional mutations have been identified.

METHODS

To establish the prevalence of VAPB mutations, we screened 80 familial ALS samples by DNA sequencing.

RESULTS

Our study failed to identify any novel VAPB gene mutations but identified a single Brazilian family harboring the P56S mutation. In a second familial ALS case, we identified a three-base pair deletion within exon 5 of the VAPB gene that deleted the serine residue at position 160 (Delta S160). This variant is detected in a normal population at low frequency (0.45%). Analyses of homology alignment and secondary structure predict that this deletion significantly alters the structure of VAPB, although a GFP-Delta S160 VAPB fusion protein demonstrates a wild-type subcellular localization. This contrasts the aberrant localization observed in a GFP-P56S VAPB fusion protein. The allele frequency of Delta S160 in patients with sporadic ALS does not differ significantly from that in the normal population.

CONCLUSIONS

Mutations in the VAPB gene are rare and the Delta S160 variant does not contribute to the development of amyotrophic lateral sclerosis

Item Type: Article
Additional Information: Additional authors: J. E. Landers, PhD, A. L. Leclerc, BA, L. Shi, MD, A. Virkud, T. Cho, BS, M. M. Maxwell, PhD, A. F. Henry, BS, M. Polak, RN, J. D. Glass, MD, T. J. Kwiatkowski, MD, A. Al-Chalabi, PhD, FRCP, C. E. Shaw, MD, FRACP, P. N. Leigh, FRCP, PhD, I. Rodriguez-Leyza, MD, D. McKenna-Yasek, RN, BSN, P. C. Sapp, BS and R. H. Brown Jr, MD, DPhil
Schools and Departments: Brighton and Sussex Medical School > Clinical Medicine
Subjects: R Medicine > RC Internal medicine > RC0321 Neurosciences. Biological psychiatry. Neuropsychiatry > RC0346 Neurology. Diseases of the nervous system Including speech disorders
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Depositing User: Patricia Butler
Date Deposited: 14 Nov 2012 17:35
Last Modified: 14 Nov 2012 17:35
URI: http://sro.sussex.ac.uk/id/eprint/42521
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