ArticleThe New phytologist2025
ARABIDOPSIS HOMOLOG OF TRITHORAX1 impacts lateral root development by epigenetic regulation of targets involved in root system architecture.
Article in The New phytologist, 2025. 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
Developmental processes are regulated at multiple levels, including the epigenetic level. Among the epigenetic factors, histone H3 lysine 4 (H3K4) methyltransferases contribute to active transcription of target genes, and here, we explored how the H3K4 methyltransferase ARABIDOPSIS HOMOLOG OF TRITHORAX1 (ATX1) affects Arabidopsis thaliana lateral root (LR) primordium (LRP) morphogenesis. We examined LR development in a loss-of-function null mutant (atx1-1) and a mutant affected in the ATX1 catalytic domain (atx1setm) through bright-field and long-term time-lapse confocal microscopy, transcriptomics, and chromatin immunoprecipitation. LRP morphogenesis in both mutants was severely abnormal, resulting from altered principal growth directions, and was accompanied by extended cell cycle durations and slower transitions between LRP stages. Among the differentially expressed genes downregulated in atx1setm, the most enriched Gene Ontology categories were cell wall organization and H
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