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  • Title: Comprehensive analysis of the homeodomain-leucine zipper IV transcription factor family in Cucumis sativus.
    Author: Fu R, Liu W, Li Q, Li J, Wang L, Ren Z.
    Journal: Genome; 2013 Jul; 56(7):395-405. PubMed ID: 24099392.
    Abstract:
    The class IV homeodomain-leucine zipper (HD-Zip IV) proteins are plant-specific transcriptional factors known to play crucial roles in plant growth and development. In this study, 11 cucumber (Cucumis sativus) HD-Zip IV genes were identified in the version 2 cucumber genome and found to be distributed unevenly across the chromosomes. The CsHDZIV (Cucumis sativus homeodomain-leucine zipper IV) gene family is smaller than in other studied species (except for rice) because of the absence of gene duplication events. Phylogenetic analysis showed that HD-Zip IV genes from cucumber, Arabidopsis, tomato, cotton, maize, and rice could be classified into five subgroups. All CsHDZIV genes appear to be derived from a basic module containing 11 exons in the coding region. Two conserved motifs of 21 and 19 nucleotides were found in the 3'-untranslated regions of six CsHDZIV genes, suggesting that post-transcriptional regulation may play a role in regulation of CsHDZIV genes. In addition, 6 of 11 CsHDZIV genes were found to undergo alternative splicing events. Reverse transcription PCR analysis showed that all CsHDZIV genes (except one) were expressed and showed preferential expression in reproductive organs.
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