How plants selectively silence jumping genes while protecting essential ones
Histone variants help establish DNA methylation at transposons (jumping genes) while preventing this epigenetic modification from spreading to essential genes in plants, a study from the Institute of Science Tokyo reveals. By revealing how these chromosome-associated proteins guide the formation of precise epigenomic patterns, the findings provide new insights into the selective silencing of…
Researchers from the Institute of Science Tokyo have discovered how plants selectively silence "jumping genes" while protecting essential genetic material. Published in Nature Communications, the study reveals the role of histone variants in establishing DNA methylation patterns at transposons, which are mobile DNA elements that can disrupt genes and cause genomic instability.
By investigating genetically engineered Arabidopsis thaliana plants lacking specific histone variants, the researchers found that H2A.W promotes DNA methylation at transposons, while H2A.Z suppresses methylation and protects essential genes. This antagonistic relationship between the two histone variants is particularly pronounced in gene-rich regions of the genome, where accurate epigenetic regulation is crucial.
In contrast, transposon-rich pericentromeric regions, where heterochromatin forms, can autonomously restore silencing without relying on H2A.Z. These findings provide a molecular framework for understanding how plants maintain genome stability by distinguishing transposons from essential genes. The researchers suggest that the conserved functions of histone variants across many organisms could inspire future epigenome-editing technologies for agriculture and medicine.
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