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The RNA helicase UP‐FRAMESHIFT (UPF1) is a key factor of nonsense‐mediated decay (NMD), a mRNA decay pathway involved in RNA quality control and in the fine‐tuning of gene expression. UPF1 recruits UPF2 and UPF3 to constitute the NMD core complex, which is conserved across eukaryotes. No other components of UPF1‐containing ribonucleoproteins (RNPs) are known in plants, despite its key role in regulating...
Arabidopsis seed size is regulated by the IKU pathway that includes IKU2 (a leucine‐rich repeat kinase) and MINI3 (a WRKY transcription factor). We report the cloning of the IKU1 (At2g35230) gene. iku1 mutants cause reduced endosperm growth and the production of small seeds. IKU1 encodes a protein containing a VQ motif, which is a motif specific to plants. IKU1 is expressed in the early endosperm...
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