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A PHD in histone language

Post-translational modifications of core histones are important for various DNA-templated processes such as transcription and repair. We recently reported that the ALFIN LIKE 6 (AL6) gene, identified in a forward genetic screen, is critical for phosphate deficiency-induced root hair formation and several other processes associated with the regulation of cellular phosphate homeostasis. AL6 contains a Plant Homeo Domain (PHD) finger that can bind to trimethylated lysine 4 of histone H3 (H3K4me3). Homozygous mutants defective in AL6 expression form very short root hairs under phosphate-deficient conditions, presumably caused by altered expression of putative primary and secondary down-stream targets of AL6. In this Addendum, we speculate about possible roles of AL6, H3K4 trimethylation and other chromatin modifications in the adaptation of plants to low phosphate availability.