Developmental decline in neuronal regeneration by the progressive change of two intrinsic timers.

Developmental decline in neuronal regeneration by the progressive change of two intrinsic timers.
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DOI:
10.1126/science.1231321
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发表时间:
2013-04-19
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Chang C
Chang C
中科院分区:
其他
文献类型:
--
作者:
Zou Y;Chiu H;Zinovyeva A;Ambros V;Chuang CF;Chang C

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Like mammalian neurons, C. elegans neurons lose axon regeneration ability as they age, but it is not known why. Here, we report that let-7 contributes to a developmental decline in AVM axon regeneration. In older AVM axons, let-7 inhibits regeneration by down regulating LIN-41, an important AVM axon regeneration-promoting factor. While let-7 inhibits lin-41 expression in older neurons through the lin-41 3'UTR, lin-41 inhibits let-7 expression in younger neurons through Argonaute ALG-1. This reciprocal inhibition ensures axon regeneration is only inhibited in older neurons. These findings show that a let-7-lin-41 regulatory circuit, which was previously shown to control timing of events in mitotic stem cell lineages, is re-utilized in postmitotic neurons to control post-differentiation events.
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