GIGYF2 gene disruption in mice results in neurodegeneration and altered insulin-like growth factor signaling.

Abstract:

:Grb10-Interacting GYF Protein 2 (GIGYF2) was initially identified through its interaction with Grb10, an adapter protein that binds activated IGF-I and insulin receptors. The GIGYF2 gene maps to human chromosome 2q37 within a region linked to familial Parkinson's disease (PARK11 locus), and association of GIGYF2 mutations with Parkinson's disease has been described in some but not other recent publications. This study investigated the consequences of Gigyf2 gene disruption in mice. Gigyf2 null mice undergo apparently normal embryonic development, but fail to feed and die within the first 2 post-natal days. Heterozygous Gigyf2(+/-) mice survive to adulthood with no evident metabolic or growth defects. At 12-15 months of age, the Gigyf2(+/-) mice begin to exhibit motor dysfunction manifested as decreased balance time on a rotating horizontal rod. This is associated with histopathological evidence of neurodegeneration and rare intracytoplasmic Lewy body-like inclusions in spinal anterior horn motor neurons. There are alpha-synuclein positive neuritic plaques in the brainstem and cerebellum, but no abnormalities in the substantia nigra. Primary cultured embryo fibroblasts from Gigyf2 null mice exhibit decreased IGF-I-stimulated IGF-I receptor tyrosine phosphorylation and augmented ERK1/2 phosphorylation. These data provide further evidence for an important role of GIGYF2 in age-related neurodegeneration and IGF pathway signaling.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Giovannone B,Tsiaras WG,de la Monte S,Klysik J,Lautier C,Karashchuk G,Goldwurm S,Smith RJ

doi

10.1093/hmg/ddp430

subject

Has Abstract

pub_date

2009-12-01 00:00:00

pages

4629-39

issue

23

eissn

0964-6906

issn

1460-2083

pii

ddp430

journal_volume

18

pub_type

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