A Drosophila model of GSS syndrome suggests defects in active zones are responsible for pathogenesis of GSS syndrome.

Abstract:

:We have established a Drosophila model of Gerstmann-Sträussler-Scheinker (GSS) syndrome by expressing mouse prion protein (PrP) having leucine substitution at residue 101 (MoPrP(P101L)). Flies expressing MoPrP(P101L), but not wild-type MoPrP (MoPrP(3F4)), showed severe defects in climbing ability and early death. Expressed MoPrP(P101L) in Drosophila was differentially glycosylated, localized at the synaptic terminals and mainly present as deposits in adult brains. We found that behavioral defects and early death of MoPrP(P101L) flies were not due to Caspase 3-dependent programmed cell death signaling. In addition, we found that Type 1 glutamatergic synaptic boutons in larval neuromuscular junctions of MoPrP(P101L) flies showed significantly increased numbers of satellite synaptic boutons. Furthermore, the amount of Bruchpilot and Discs large in MoPrP(P101L) flies was significantly reduced. Brains from scrapie-infected mice showed significantly decreased ELKS, an active zone matrix marker compared with those of age-matched control mice. Thus, altered active zone structures at the molecular level may be involved in the pathogenesis of GSS syndrome in Drosophila and scrapie-infected mice.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Choi JK,Jeon YC,Lee DW,Oh JM,Lee HP,Jeong BH,Carp RI,Koh YH,Kim YS

doi

10.1093/hmg/ddq379

subject

Has Abstract

pub_date

2010-11-15 00:00:00

pages

4474-89

issue

22

eissn

0964-6906

issn

1460-2083

pii

ddq379

journal_volume

19

pub_type

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