title: dSir2 in the adult fat body, but not in muscles, regulates life span in a diet-dependent manner.
abstract: Sir2, an evolutionarily conserved NAD(+)-dependent deacetylase, has been implicated as a key factor in mediating organismal life span. However, recent contradictory findings have brought into question the role of Sir2 and its orthologs in regulating organismal longevity. In this study, we report that Drosophila Sir2 (dSir2) in the adult fat body regulates longevity in a diet-dependent manner. We used inducible Gal4 drivers to knock down and overexpress dSir2 in a tissue-specific manner. A diet-dependent life span phenotype of dSir2 perturbations (both knockdown and overexpression) in the fat body, but not muscles, negates the effects of background genetic mutations. In addition to providing clarity to the field, our study contrasts the ability of dSir2 in two metabolic tissues to affect longevity. We also show that dSir2 knockdown abrogates fat-body dFOXO-dependent life span extension. This report highlights the importance of the interplay between genetic factors and dietary inputs in determining organismal life spans.
authors.affiliation: Department of Biological Sciences, Tata Institute of Fundamental Research, Colaba, Mumbai 400005, India.
authors.forename: Kushal Kr
authors.initials: KK
authors.lastname: Banerjee
authors.forename: Champakali
authors.initials: C
authors.lastname: Ayyub
authors.forename: Syed Zeeshan
authors.initials: SZ
authors.lastname: Ali
authors.forename: Vinesh
authors.initials: V
authors.lastname: Mandot
authors.forename: Nagaraj G
authors.initials: NG
authors.lastname: Prasad
authors.forename: Ullas
authors.initials: U
authors.lastname: Kolthur-Seetharam
mesh_terms: D000818:Animals; D004032:Diet; D029721:Drosophila Proteins / Q000235:genetics / Q000378:metabolism*; D004331:Drosophila melanogaster; D005216:Fat Body / Q000378:metabolism*; D051858:Forkhead Transcription Factors / Q000235:genetics / Q000378:metabolism; D055785:Gene Knockdown Techniques; D006655:Histone Deacetylases / Q000235:genetics / Q000378:metabolism*; D008136:Longevity / Q000502:physiology*; D009132:Muscles / Q000378:metabolism; D037761:Sirtuins / Q000235:genetics / Q000378:metabolism*
chemical_list: D029721:Drosophila Proteins; C477334:FOXO protein, Drosophila; D051858:Forkhead Transcription Factors; C447899:Sirt2 protein, Drosophila; D037761:Sirtuins; D006655:Histone Deacetylases