Development of a Recombinase Polymerase Amplification-CRISPR/Cas12a Detection System for Cacao Mild Mosaic Virus.
De Silva Weligodage H, Goenaga R, Gutierrez OA, Brown JK
Crispr
Cacao trees can silently harbor a virus for entire growing seasons with zero visible symptoms, meaning infected plants in collections or breeding programs go undetected until a mealybug outbreak spreads the disease — and this new test is sensitive enough to catch it before that happens.
Cacao trees — the source of chocolate — can be infected with a virus that hides so well the tree looks completely healthy. This sneaky virus travels from tree to tree via tiny insects called mealybugs, and it was nearly impossible to detect because it exists at such low levels in leaves. Researchers built a new two-step test using CRISPR gene-editing technology paired with a rapid amplification method that is now sensitive enough to reliably find the virus even when it's barely present.
Key Findings
CaMMV accumulates at low levels in cacao leaves and petioles, causing detection failures with conventional methods, particularly in certain cacao genetic groups
A multiplex RPA assay using three primers targeting two regions of the virus's movement protein was developed to increase detection reliability
Coupling RPA with CRISPR/Cas12a created a system capable of detecting the virus even during asymptomatic, seasonally variable infections
chevron_right Technical Summary
Scientists developed a highly sensitive dual-technology test (combining RPA and CRISPR) to reliably detect Cacao Mild Mosaic Virus, a pathogen that hides in cacao trees at low levels and often causes no visible symptoms, making it a hidden threat in breeding programs and germplasm collections.
Abstract Preview
Plant viruses that cause minimal to no disease symptoms may not support readily detectable virus levels. Such viruses are of concern when they persist in plant germplasm collections or in breeding ...
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