Evolutionary mobility and genetic dynamics of MORFFO genes: shuttling among ancient plant lineages.
Labiak PH, Kuo LY, Fauskee BD, Karol KG
Mobile Genetic Elements
Understanding how genes move between plants and their organelles could reshape how scientists think about plant evolution and, ultimately, how we might engineer more resilient crops or understand why some ancient plant lineages like ferns have survived hundreds of millions of years.
Inside every plant cell are tiny structures called chloroplasts that capture sunlight, and they carry their own mini-genome. Scientists always assumed these mini-genomes were very stable and didn't change much — but ferns break that rule. Researchers studying a group of ancient ferns found that certain genes inside fern chloroplasts act like wandering travelers: they jump around, evolve at turbo speed, and may even hitch rides between plants. These 'hitchhiker genes' appear to live a semi-independent life, copying themselves outside the chloroplast and spreading in ways more typical of viruses or jumping genes than normal plant DNA.
Key Findings
MORFFOs (mobile genes) show exceptionally high substitution rates compared to standard chloroplast genes, meaning they evolve far faster than expected for genes in an organelle known for stability.
Across 30 species of Anemiaceae ferns, MORFFOs were found in diverse and shifting locations within the chloroplast genome, confirming their ability to 'transpose' or jump to new positions.
Phylogenetic analysis revealed that MORFFO evolutionary histories do not match those of other chloroplast genes, implying they replicate independently — possibly outside the chloroplast — and spread through horizontal gene transfer between organisms.
chevron_right Technical Summary
Scientists discovered that ferns carry unusual 'jumping genes' in their chloroplasts — the energy-producing organelles in plant cells — that move around, evolve rapidly, and may spread between plants via horizontal gene transfer, challenging the long-held view that plant chloroplast genomes are stable and static.
Abstract Preview
Plastid genomes (plastomes) of land plants are characterized by their architectural and genic content stability. However, fern plastomes exhibit unexpected dynamism, characterized by the presence o...
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