Disabling one gene makes invasive fruit flies completely infertile
Fu J, Wang J, Ling S, Pan Y, Jia L
Crispr
If you grow mangoes, citrus, or guava, the oriental fruit fly is one of the reasons those crops get quarantined and sprayed, and this gene could offer a pesticide-free way to shut down its reproduction.
The oriental fruit fly is a tiny but destructive insect that damages fruit crops around the world by laying eggs inside the fruit. Researchers found a single gene, nicknamed BdPiwi, that the flies need to make working eggs and sperm; when they switched it off using gene-editing tools, the flies grew up but never produced offspring, and even their growth into adults got thrown off schedule. That makes this gene a tempting target for future pest-control strategies that work by sterilizing flies instead of poisoning orchards.
Key Findings
CRISPR/Cas9 knockout of BdPiwi caused complete sterility in both sexes: females had no detectable oocytes and males produced no mature sperm.
Loss of BdPiwi triggered widespread transposon derepression and broad transcriptional upregulation, including dysregulation of immune and metabolic genes linked to egg development failure.
Mutant flies also showed prolonged larval duration and abnormal eclosion (emergence), indicating BdPiwi affects metamorphosis beyond its role in fertility.
chevron_right Technical Summary
Scientists disabled a gene called BdPiwi in the oriental fruit fly, a major invasive pest of fruit crops worldwide, and found it left both males and females completely sterile while also delaying their development into adults. The discovery points to a possible genetic target for controlling this destructive pest without pesticides.
Abstract Preview
Original paper
BdPiwi is essential for gametogenesis and post-embryonic development in the oriental fruit fly, Bactrocera dorsalis.
The PIWI-interacting RNA (piRNA) pathway is a conserved transposon silencing mechanism essential for genomic integrity and gametogenesis. While Piwi proteins are known to play essential roles in in...
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