title: Differential expression of alpha-synuclein, parkin, and synphilin-1 isoforms in Lewy body disease.
abstract: Alpha-synuclein, parkin, and synphilin-1 are proteins mainly involved in the pathogenesis of Lewy body (LB) diseases. mRNAs of all three undergo alternative splicing, so that the existence of various isoforms has been described. Since increasing evidence supports the importance of differential isoform-expression changes in disease development, we have established isoform-expression profiles in frontal cortices of LB disease brains in comparison with those of Alzheimer disease (AD) and control frontal cortices. The differential expression of four alpha-synuclein, seven parkin, and four synphilin-1 isoforms was ascertained by the use of isoform-specific primers and relative expression analysis with SybrGreen and beta-actin as an internal standard. The establishment of isoform-expression profiles revealed that these are disease specific. Moreover, isoform-expression deregulation of mainly one gene in each disease could be observed. All four alpha-synuclein isoforms were affected in the case of the pure form of dementia with LB, most parkin transcript variants in common LB disease, and all synphilin-1 isoforms in Parkinson disease. Only minor involvement was detected in AD. Finally, the existence of a proprietary isoform-expression profile in common LB disease indicates that this disease develops as a result of its own molecular mechanisms, and so, at the molecular level, it does not exactly share changes found in pure dementia with LB and AD. In conclusion, isoform-expression profiles in LB diseases represent additional evidence for the direct involvement of isoform-expression deregulation in the development of neurodegenerative disorders.
authors.affiliation: Department of Pathology, Hospital Germans Trias i Pujol, Autonomous University of Barcelona, Barcelona, Spain. katrinbeyer@hotmail.com
authors.forename: Katrin
authors.initials: K
authors.lastname: Beyer
authors.forename: Montserrat
authors.initials: M
authors.lastname: Domingo-Sàbat
authors.forename: Jordi
authors.initials: J
authors.lastname: Humbert
authors.forename: Cristina
authors.initials: C
authors.lastname: Carrato
authors.forename: Isidro
authors.initials: I
authors.lastname: Ferrer
authors.forename: Aurelio
authors.initials: A
authors.lastname: Ariza
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000235:genetics / Q000378:metabolism; D001483:Base Sequence; D002352:Carrier Proteins / Q000235:genetics* / Q000378:metabolism; D016022:Case-Control Studies; D017931:DNA Primers / Q000235:genetics; D005260:Female; D005625:Frontal Lobe / Q000378:metabolism; D015870:Gene Expression; D020869:Gene Expression Profiling; D006801:Humans; D020961:Lewy Body Disease / Q000209:etiology / Q000235:genetics* / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D019578:Multiple System Atrophy / Q000235:genetics / Q000378:metabolism; D009419:Nerve Tissue Proteins / Q000235:genetics* / Q000378:metabolism; D010300:Parkinson Disease / Q000235:genetics / Q000378:metabolism; D016133:Polymerase Chain Reaction; D020033:Protein Isoforms / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D044767:Ubiquitin-Protein Ligases / Q000235:genetics* / Q000378:metabolism; D051844:alpha-Synuclein / Q000235:genetics* / Q000378:metabolism
chemical_list: D002352:Carrier Proteins; D017931:DNA Primers; D009419:Nerve Tissue Proteins; D020033:Protein Isoforms; D012333:RNA, Messenger; C118958:SNCAIP protein, human; D051844:alpha-Synuclein; D044767:Ubiquitin-Protein Ligases; C111567:parkin protein