The zinc-finger protein SEA-2 regulates larval developmental timing and adult lifespan in C. elegans

National Institute of Biological Sciences, Beijing, 102206 Beijing, People's Republic of China.
Development (Impact Factor: 6.46). 04/2011; 138(10):2059-68. DOI: 10.1242/dev.057109
Source: PubMed


Like other biological processes, aging is regulated by genetic pathways. However, it remains largely unknown whether aging is determined by an innate programmed timing mechanism and, if so, how this timer is linked to the mechanisms that control developmental timing. Here, we demonstrate that sea-2, which encodes a zinc-finger protein, controls developmental timing in C. elegans larvae by regulating expression of the heterochronic gene lin-28 at the post-transcriptional level. lin-28 is also essential for the autosomal signal element (ASE) function of sea-2 in X:A signal assessment. We also show that sea-2 modulates aging in adulthood. Loss of function of sea-2 slows the aging process and extends the adult lifespan in a DAF-16/FOXO-dependent manner. Mutation of sea-2 promotes nuclear translocation of DAF-16 and subsequent activation of daf-16 targets. We further demonstrate that insulin/IGF-1 signaling functions in the larval heterochronic circuit. Loss of function of the insulin/IGF-1 receptor gene daf-2, which extends lifespan, also greatly enhances the retarded heterochronic defects in sea-2 mutants. Regulation of developmental timing by daf-2 requires daf-16 activity. Our study provides evidence for intricate interplay between the heterochronic circuit that controls developmental timing in larvae and the timing mechanism that modulates aging in adults.

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Available from: Xinxin Huang, Mar 25, 2014
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    • "We note, though, that sea-2 has roles in development beyond controlling sex determination and dosage compensation. Huang et al. (2011) demonstrated a role for sea-2 in regulating larval developmental timing and adult life span. "
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