GSBS Student Publications

Title

ubiquilin antagonizes presenilin and promotes neurodegeneration in Drosophila

GSBS Program

Biochemistry & Molecular Pharmacology

UMMS Affiliation

Graduate School of Biomedical Sciences

Date

10-20-2007

Document Type

Article

Medical Subject Headings

Alzheimer Disease; Animals; Carrier Proteins; Cell Cycle Proteins; Drosophila Proteins; Drosophila melanogaster; Humans; Presenilins; Retinal Degeneration

Disciplines

Life Sciences | Medicine and Health Sciences

Abstract

The majority of familial Alzheimer's disease (AD) cases are caused by mutations in presenilins, therefore, identifying regulators of presenilins is crucial for understanding AD pathogenesis. Ubiquilin 1 (UBQLN1) binds Presenilins in mammalian cells; however, the functional significance of this interaction in vivo remains unclear. Moreover, while genetic variants in UBQLN1 have recently been reported to associate with an increased risk for AD, whether these variants have altered function is unknown. Here, we show that Drosophila Ubiquilin (Ubqn) binds to Drosophila Presenilin (Psn), and that loss of ubqn function suppresses phenotypes that arise from loss of psn function in vivo. In addition, overexpression of ubqn in the eye results in adult-onset, age-dependent retinal degeneration, which is at least partially apoptotic in nature. The degeneration associated with ubqn overexpression can also be suppressed by psn overexpression and enhanced by expression of a dominant negative version of Psn. Remarkably, expression of the human AD-associated variant of UBQLN1 leads to more severe degeneration than does comparable expression of the human wildtype UBQLN1. Together, these data identify Ubqn as a regulator of Psn, support an important role for UBQLN1 in AD pathogenesis, and suggest the possibility that expression of a human AD-associated variant can cause neurodegeneration independent of amyloid production.

Rights and Permissions

Citation: Hum Mol Genet. 2008 Jan 15;17(2):293-302. Epub 2007 Oct 18. Link to article on publisher's site

DOI of Published Version

10.1093/hmg/ddm305

Related Resources

Link to Article in PubMed

Journal Title

Human molecular genetics

PubMed ID

17947293