ArticleJournal of applied genetics2026
Genome-wide identification of CHY zinc finger and RING finger (CHYR) genes in pepper and functional characterization of CaCHYR5 in response to Phytophthora capsici infection.
Article in Journal of applied genetics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
CHY zinc finger and RING finger (CHYR) proteins play crucial roles in the growth and development, as well as stress response. To date, no systematic or comprehensive analysis of the CHYR gene family has been performed in pepper (Capsicum annuum L.). In this study, we identified 8 CaCHYR genes (CaCHYR1-CaCHYR8), which were classified into 3 groups based on phylogenetic relationships. CaCHYR members within the same group exhibited similar distributions of conserved motifs and exon-intron structures. Chromosomal localization analysis showed that 8 CaCHYR genes were unevenly distributed on 6 chromosomes. Segmental duplication, rather than tandem duplication, was found to be the major contributor to the expansion of this gene family. CaCHYR genes feature a variety of cis-elements involved in developmental processes, phytohormone responses, and stress adaptation. Expression analysis based on RNA-seq data revealed that CaCHYR genes exhibited distinct spatial expression patterns across different tissues and in response to Phytophthora capsici infection (PCI), and quantitative real-time PCR (qRT-PCR) further confirmed that three of them (CaCHYR2, CaCHYR3, and CaCHYR5) exhibited altered expression under PCI. Furthermore, transient overexpression of CaCHYR5 in pepper leaves increased susceptibility to PCI, suggesting its potential negative regulatory role in pepper defense against P. capsici. Collectively, these findings reveal the expression patterns and regulatory functions of pepper CHYR genes in growth and development, laying a groundwork for breeding pepper cultivars tolerant to PCI.
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