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Chromosome-level genome of black cutworm provides novel insights into polyphagy and seasonal migration in insects
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Chromosome-level genome of black cutworm provides novel insights into polyphagy and seasonal migration in insects
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Journal Article
Chromosome-level genome of black cutworm provides novel insights into polyphagy and seasonal migration in insects
2023
Overview
Background
The black cutworm,
Agrotis ipsilon
, is a serious global underground pest. Its distinct phenotypic traits, especially its polyphagy and ability to migrate long distances, contribute to its widening distribution and increasing difficulty of control. However, knowledge about these traits is still limited.
Results
We generated a high-quality chromosome-level assembly of
A. ipsilon
using PacBio and Hi-C technology with a contig N50 length of ~ 6.7 Mb. Comparative genomic and transcriptomic analyses showed that detoxification-associated gene families were highly expanded and induced after insects fed on specific host plants. Knockout of genes that encoded two induced ABC transporters using CRISPR/Cas9 significantly reduced larval growth rate, consistent with their contribution to host adaptation. A comparative transcriptomic analysis between tethered-flight moths and migrating moths showed expression changes in the circadian rhythm gene
AiCry2
involved in sensing photoperiod variations and may receipt magnetic fields accompanied by MagR and in genes that regulate the juvenile hormone pathway and energy metabolism, all involved in migration processes.
Conclusions
This study provides valuable genomic resources for elucidating the mechanisms involved in moth migration and developing innovative control strategies.
