Plants keep repairing their genetic memory long after cells divide
Edera A, Larue M, Leduque B, Michaud C, Selles B
Plant Signaling
The variegated leaf pattern or flower color quirk you've noticed pop up in a clone or seedling from your garden may trace back to this slow, ongoing DNA-tagging process rather than a one-time copying error.
Every time a plant cell divides, it has to copy tiny chemical marks on its DNA that tell genes when to switch on or off, sort of like sticky notes that get passed to each new cell. Researchers built glowing molecular sensors to watch this copying happen live in a mustard plant relative called Arabidopsis, and found that a key protein keeps re-checking and fixing those marks for a long stretch after the DNA itself has already been copied. This slow cleanup process, shared with mammals, helps explain why some plant traits stay stable for generations while others drift or change unexpectedly.
Key Findings
MET1, the main CG-methylation enzyme in Arabidopsis, stays attached to chromatin from S phase through G2 phase, far longer than DNA replication itself takes
MET1 works like its mammalian counterpart DNMT1, adding methylation marks based on how nucleosomes are physically arranged rather than only copying existing marks on the opposite DNA strand
This nucleosome-guided activity helps restore lost methylation marks and explains natural variation in DNA methylation patterns across both plant and mammal generations
chevron_right Technical Summary
Scientists discovered that plants keep copying and fixing their DNA's chemical tags long after cell division finishes, using a repair system similar to one found in animals, which helps explain why some traits get passed down reliably while others quietly shift over generations.
Abstract Preview
Original paper
Replication-uncoupled MET1/DNMT1 activity shapes inheritance of DNA methylation.
Cytosine methylation at CG sites is proposed to be maintained during DNA replication through a semiconservative mechanism. In mammals, this maintenance involves replication-coupled and replication-...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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