Genome study maps the war between fire blight and its viruses
Rahimian M, Aghazadeh-Soltan-Ahmadi M
Crispr
Fire blight can turn a healthy backyard apple or pear tree into blackened, dying branches in a single wet spring, and this work points toward viruses that might one day stop it without chemical sprays.
Fire blight is a bacterial disease that devastates apple and pear trees worldwide. Researchers compared the genetic makeup of 317 strains of the bacterium and 227 viruses that attack it, finding the two locked in a long evolutionary battle where each keeps evolving new attacks and defenses. Understanding this fight could help scientists harness the viruses as a natural weapon against the disease.
Key Findings
Analyzed 317 Erwinia amylovora strains and 227 Erwinia phages to trace virulence and phage-host dynamics
Many of the bacterium's virulence factors appear to share origins with plant, human, and animal pathogens, pointing to widespread horizontal gene transfer
Found non-random co-occurrence and mutual-exclusivity patterns between bacterial defense systems (RM, CRISPR-Cas, TA) and mobile anti-defense genes, consistent with a phage-bacteria arms race
chevron_right Technical Summary
Scientists mapped the genomes of hundreds of fire blight bacteria and the viruses that infect them, revealing an ongoing evolutionary arms race and pointing toward viruses that could be used to fight this destructive disease of apples and pears.
Abstract Preview
Original paper
Evolutionary interplay: virulence, endolysin-like hydrolases, and defense correlations in the Erwinia amylovora pangenome.
Erwinia amylovora, the causative agent of fire blight, poses a significant threat to global pome fruit production. This study presents a comprehensive genomic analysis of 317 E. amylovora strains a...
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