The Worm Podcast4 Jun 2025

EPISODE 16: Cut, Paste, Attack – How Nematodes Remix Their Genetic Arsenal

In this episode, we dive into a genetic mystery: how can a single gene in plant-parasitic nematodes have thousands of alleles? This study unravels the bizarre behaviour of HYP effectors — genes that help nematodes infect plants but defy traditional genetics.

Using CRISPR, long-read sequencing, and clever maths, the researchers reveal:

How the HYP gene rearranges motifs in its hyper-variable domain (HVD) with flawless precision
That most nematodes appear homozygous, despite the population showing extreme diversity
A proposed mechanism called HVD editing — a form of locus-specific somatic genome editing
Why this mirrors the way our immune system reshuffles antibody genes

This isn’t just about plant pests — it’s a rare glimpse at real-time genome innovation, where diversity is generated with intent, not random chance.

📖 Based on the research article:

“A gene with a thousand alleles: The hyper-variable effectors of plant-parasitic nematodes”

Unnati Sonawala, Helen Beasley, Peter Thorpe, Kyriakos Varypatakis, Beatrice Senatori, John T. Jones, Lida Derevnina & Sebastian Eves-van den Akker

Published in Cell Genomics (2024).

🔗 https://doi.org/10.1016/j.xgen.2024.100580

🎧 Subscribe to the WoRM Podcast for more strange and spectacular tales of genome biology.

This podcast is generated with artificial intelligence and curated by Veeren. If you’d like your publication featured on the show, please get in touch.

📩 More info:

🔗 ⁠⁠www.veerenchauhan.com⁠⁠

📧 veeren.chauhan@nottingham.ac.uk

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