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Developmental control of Presenilin1 expression, endoproteolysis, and interaction in zebrafish embryos.

Abstract：

:Dominant mutations in presenilin1 (PS1) and presenilin2 (PS2) are a major cause of early-onset Alzheimer's disease. In this report we analyze the expression of the zebrafish presenilin1 (Psen1) and presenilin2 (Psen2) proteins during embryogenesis. We demonstrate that Psen1 and Psen2 holoproteins are relatively abundant in zebrafish embryos and are proteolytically processed. Psen1 is maternally expressed, whereas Psen2 is expressed at later stages during development. The Psen1 C-terminal proteolytic fragment (CTF) is present at varying levels during embryogenesis, indicating the existence of developmental control mechanisms regulating its production. We examine the codependency of Psen1 and Psen2 expression during early embryogenesis. Forced overexpression of psen2 increases expression of Psen2 holoprotein, but not the N-terminal fragment (NTF), indicating that levels of Psen2 NTF are strictly controlled. Overexpression of psen2 did not alter levels of Psen1 holoprotein, CTF, or higher molecular weight complexes. Reduction of Psen1 activity in zebrafish embryos produces similar developmental defects to those seen for loss of PS1 activity in knockout mice. The relevance of these results to previous work on presenilin protein regulation and function are discussed. Our work shows that zebrafish embryos are a valid and valuable system in which to study presenilin interactions, regulation, and function.

journal_name

Exp Cell Res

journal_title

Experimental cell research

authors

Nornes S,Groth C,Camp E,Ey P,Lardelli M

doi

10.1016/s0014-4827(03)00257-x

keywords:

subject

Has Abstract

pub_date

2003-09-10 00:00:00

pages

124-32

issue

1

eissn

0014-4827

issn

1090-2422

pii

S001448270300257X

journal_volume

289

pub_type

杂志文章

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