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Exp Gerontol. 2009 Aug;44(8):532-40. doi: 10.1016/j.exger.2009.05.007. Epub 2009 May 28.

A forward genetic screen in Drosophila implicates insulin signaling in age-related locomotor impairment.

Author information

1
Department of Human and Molecular Genetics, Virginia Commonwealth University, Richmond, VA 23298, USA.

Abstract

Age-related locomotor impairment (ARLI) is one of the most detrimental changes that occurs during aging. Elderly individuals with ARLI are at increased risks for falls, depression and a number of other co-morbidities. Despite its clinical significance, little is known about the genes that influence ARLI. We consequently performed a forward genetic screen to identify Drosophila strains with delayed ARLI using negative geotaxis as an index of locomotor function. One of the delayed ARLI strains recovered from the screen had a P-element insertion that decreased expression of the insulin signaling gene phosphoinositide-dependent kinase 1 (PDK1) Precise excision of the P-element insertion reverted PDK1 expression and ARLI to the same as control flies, indicating that disruption of PDK1 leads to delayed ARLI. Follow-up studies showed that additional loss of function mutations in PDK1 as well as loss of function alleles of two other insulin signaling genes, Dp110 and Akt (the genes for the catalytic subunit of phosphoinositide 3-kinase and AKT), also forestalled ARLI. Interestingly, only some of the strains with delayed ARLI had elevated resistance to paraquat, indicating that enhanced resistance to this oxidative stressor is not required for preservation of locomotor function across age. Our studies implicate insulin signaling as a key regulator of ARLI in Drosophila.

PMID:
19481596
PMCID:
PMC2722046
DOI:
10.1016/j.exger.2009.05.007
[Indexed for MEDLINE]
Free PMC Article

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