Diversification of plant specific organellar single-stranded DNA binding genes and their roles in mitochondrial genome rearrangements in Arabidopsis and rice.
Hou Y, Gu X, Nie L, Wang J, Wu Z
Genome Stability
Every rice plant in a paddy and every vegetable in your kitchen garden runs its cellular metabolism off mitochondrial DNA — and this research reveals the molecular gatekeepers that keep that DNA from scrambling, which ultimately shapes whether a plant grows vigorously or falters under stress.
Mitochondria are the power plants inside every plant cell, and they carry their own small set of DNA instructions. Plants have evolved a family of special proteins that act like proofreaders, keeping that DNA from getting reshuffled in dangerous ways. When researchers knocked out these proofreader proteins in thale cress and rice, the mitochondrial DNA started rearranging itself in ways that could disrupt normal plant function — giving scientists a clearer picture of how plants maintain energy-production stability.
Key Findings
Researchers catalogued 182 OSB guardian genes spread across 59 plant species, tracing how this protein family diversified from ancient algae through modern flowering plants.
Losing OSB proteins caused recombination to increase at medium-sized repetitive DNA segments in mitochondria while simultaneously decreasing at repeats longer than 1 kb — a counterintuitive two-directional effect.
Mutant plants in both Arabidopsis and rice showed uneven DNA read coverage across their mitochondrial genomes and shifts in which genome arrangement was dominant, indicating structural instability.
chevron_right Technical Summary
Plants rely on specialized guardian proteins to keep their mitochondrial DNA stable and correctly organized. This study reveals how those guardian proteins evolved across the plant kingdom and shows that losing them causes the mitochondrial genome to shuffle in unexpected ways in both thale cress and rice.
Abstract Preview
Organelle genome stability is essential for plant development and adaptation. Recombination of repetitive sequences in plant mitochondrial genomes is a key factor influencing this stability and is ...
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Arabidopsis thaliana, the thale cress, mouse-ear cress or arabidopsis, is a small plant from the mustard family (Brassicaceae), native to Eurasia and Africa. Commonly found along the shoulders of roads and in disturbed land, it is generally considered a weed.