Main menu

Draft genome assemblies and annotations of Agrypnia vestita walker, and Hesperophylax magnus banks reveal substantial repetitive element expansion in tube case-making caddisflies (Insecta: Trichoptera)


Trichoptera (caddisflies) play an essential role in freshwater ecosystems; for instance, larvae process organic material from the water and are food for a variety of predators. Knowledge on the genomic diversity of caddisflies can facilitate comparative and phylogenetic studies thereby allowing scientists to better understand the evolutionary history of caddisflies. While Trichoptera are the most diverse aquatic insect order, they remain poorly represented in terms of genomic resources.

To date, all long-read based genomes have been sequenced from individuals in the retreat-making suborder, Annulipalpia, leaving ∼275 Ma of evolution without high-quality genomic resources. Here, we report the first long-read based de novo genome assemblies of two tube case-making Trichoptera from the suborder Integripalpia, Agrypnia vestita Walker and Hesperophylax magnus Banks.

We find that these tube case-making caddisflies have genome sizes that are at least three-fold larger than those of currently sequenced annulipalpian genomes and that this pattern is at least partly driven by major expansion of repetitive elements. In H. magnus, long interspersed nuclear elements (LINEs) alone exceed the entire genome size of some annulipalpian counterparts suggesting that caddisflies have high potential as a model for understanding genome size evolution in diverse insect lineages.

Significance There is a lack of genomic resources for aquatic insects. So far, only three high-quality genomes have been assembled, all from individuals in the retreat-making suborder Annulipalpia.

In this article, we report the first high-quality genomes of two case-making species from the suborder Integripalpia, which are essential for studying genomic diversity across this ecologically diverse insect order.

Our research reveals larger genome sizes in the tube case-makers (suborder Integripalpia, infraorder Phryganides), accompanied by a disproportionate increase of repetitive DNA. This suggests that genome size is at least partly driven by a major expansion of repetitive elements.

Our work shows that caddisflies have high potential as a model for understanding how genomic diversity might be linked to functional diversification and forms the basis for detailed studies on genome size evolution in caddisflies.

Authors: Lindsey K. Olsen, Jacqueline Heckenhauer, John S. Sproul, Rebecca B. Dikow, Vanessa L. Gonzalez, Matthew P. Kweskin, Adam M. Taylor, Seth B. Wilson, Russell J. Stewart, Xin Zhou,, Ralph Holzenthal, Steffen U. Pauls, Paul B. Frandsen

入门指南

购买 MinION 启动包 Nanopore 商城 测序服务提供商 全球代理商

纳米孔技术

订阅 Nanopore 更新 资源库及发表刊物 什么是 Nanopore 社区

关于 Oxford Nanopore

新闻 公司历程 可持续发展 领导团队 媒体资源和联系方式 投资者 合作者 在 Oxford Nanopore 工作 职位空缺 商业信息 BSI 27001 accreditationBSI 90001 accreditationBSI mark of trust
Chinese flag