Abstract: PHD-finger proteins were found universally in eukaryotes and known as key players in regulating chromatin or transcription . In animals, many PHD-finger proteins had been well studied on structure and function . Compared to animals, only a few of plant PHD-finger proteins had been characterized functionally . By both SMART and Pfam searches, 70 members of the PHD-finger family were identified in Arabidopsis thaliana .Most of the PHD-finger proteins in Arabidopsis thaliana were functionally unknown . A complete overview of this family by bioinformatic approach were presented in this
paper , including the gene structure , gene localization in genome , gene expression , protein motif organization , and phylogenetic relationship of each family member . These results should provide useful information for the further structural and functional studies of PHD-finger proteins .

Key words: Arabidopsis thaliana