Human Molecular Genetics Advance Access published online on February 11, 2008
Human Molecular Genetics, doi:10.1093/hmg/ddn041
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The intracellular accumulation of polymeric neuroserpin explains the severity of the dementia FENIB
1 Department of Medicine, University of Cambridge, Cambridge Institute for Medical Research, Wellcome Trust/MRC Building, Hills Road, Cambridge, CB2 0XY, United Kingdom 2 Departamento de Biología Celular, Genética y Fisiología, Universidad de Málaga, Facultad de Ciencias, Campus de Teatinos, Málaga, 29071, España 3 University of Trento, Center for Integrative Biology, via delle Regole, 101, 38100 Mattarello (Trento), Italy 4 Department of Genetics, University of Cambridge, Downing Street, Cambridge, CB2 3EH, United Kingdom
* To whom correspondence should be addressed: e-mail: em285{at}cam.ac.uk, phone: (+44) 1223 336825, Fax: (+44) 1223 336827
Received December 17, 2007; Revised February 7, 2008; Accepted February 7, 2008
Familial encephalopathy with neuroserpin inclusion bodies (FENIB) is an autosomal dominant dementia that is characterised by the retention of polymers of neuroserpin as inclusions within the endoplasmic reticulum (ER) of neurons. We have developed monoclonal antibodies that detect polymerised neuroserpin and have used COS-7 cells, stably transfected PC12 cell lines and transgenic Drosophila melanogaster to characterise the cellular handling of all four mutant forms of neuroserpin that cause FENIB. We show a direct correlation between the severity of the disease-causing mutation and the accumulation of neuroserpin polymers in cell and fly models of the disease. Moreover mutant neuroserpin causes locomotor deficits in the fly allowing us to demonstrate a direct link between polymer accumulation and neuronal toxicity.