RRC ID 46482
著者 Zou Y, Chiu H, Domenger D, Chuang CF, Chang C.
タイトル The lin-4 microRNA targets the LIN-14 transcription factor to inhibit netrin-mediated axon attraction.
ジャーナル Sci Signal
Abstract miR-125 microRNAs, such as lin-4 in Caenorhabditis elegans, were among the first microRNAs discovered, are phylogenetically conserved, and have been implicated in regulating developmental timing. Here, we showed that loss-of-function mutations in lin-4 microRNA increased axon attraction mediated by the netrin homolog UNC-6. The absence of lin-4 microRNA suppressed the axon guidance defects of anterior ventral microtubule (AVM) neurons caused by loss-of-function mutations in slt-1, which encodes a repulsive guidance cue. Selective expression of lin-4 microRNA in AVM neurons of lin-4-null animals indicated that the effect of lin-4 on AVM axon guidance was cell-autonomous. Promoter reporter analysis suggested that lin-4 was likely expressed strongly in AVM neurons during the developmental time frame that the axons are guided to their targets. In contrast, the lin-4 reporter was barely detectable in anterior lateral microtubule (ALM) neurons, axon guidance of which is insensitive to netrin. In AVM neurons, the transcription factor LIN-14, a target of lin-4 microRNA, stimulated UNC-6-mediated ventral guidance of the AVM axon. LIN-14 promoted attraction of the AVM axon through the UNC-6 receptor UNC-40 [the worm homolog of vertebrate Deleted in Colorectal Cancer (DCC)] and its cofactor MADD-2, which signals through both the UNC-34 (Ena) and the CED-10 (Rac1) downstream pathways. LIN-14 stimulated UNC-6-mediated axon attraction in part by increasing UNC-40 abundance. Our study indicated that lin-4 microRNA reduced the activity of LIN-14 to terminate UNC-6-mediated axon guidance of AVM neurons.
巻・号 5(228)
ページ ra43
公開日 2012-6-12
DOI 10.1126/scisignal.2002437
PII 5/228/ra43
PMID 22692424
PMC PMC3670680
MeSH Animals Animals, Genetically Modified Axons / metabolism Axons / physiology Base Sequence Caenorhabditis elegans / growth & development* Caenorhabditis elegans Proteins / metabolism* Cell Adhesion Molecules / metabolism DNA Primers / genetics Growth Cones / metabolism Growth Cones / physiology* Larva / growth & development MicroRNAs / genetics MicroRNAs / metabolism* Microscopy, Fluorescence Molecular Sequence Data Mutation / genetics Nerve Tissue Proteins / metabolism* Netrins Neurogenesis / physiology* Nuclear Proteins / metabolism* RNA Interference Reverse Transcriptase Polymerase Chain Reaction Sequence Alignment Sequence Analysis, DNA Signal Transduction / physiology*
IF 6.467
引用数 25
WOS 分野 BIOCHEMISTRY & MOLECULAR BIOLOGY CELL BIOLOGY
リソース情報
線虫 tm974