4.7 Article Data Paper

Generation of a chromosome-scale genome assembly of the insect-repellent terpenoid-producing Lamiaceae species, Callicarpa americana

期刊

GIGASCIENCE
卷 9, 期 9, 页码 -

出版社

OXFORD UNIV PRESS
DOI: 10.1093/gigascience/giaa093

关键词

beautyberry; callicarpenal; clerodane; gene cluster; insect repellent; kolavenyl diphosphate; specialized metabolites; terpene synthase

资金

  1. National Science Foundation Plant Genome Research Program [IOS-1444499]
  2. Michigan State University Strategic Partnership Grants Program
  3. U.S. Department of Energy-Great Lakes Bioenergy Research Center [DE-FC02-07ER64494, DE-SC0018409]
  4. Michigan State University AgBioResearch [MICL02454]
  5. Department ofMolecular Biology and Biochemistry, Michigan State University
  6. Michigan State University Strategic Partnership Grant program Plant-inspired Chemical Diversity
  7. [MICL02431]

向作者/读者索取更多资源

Background: Plants exhibit wide chemical diversity due to the production of specialized metabolites that function as pollinator attractants, defensive compounds, and signaling molecules. Lamiaceae (mints) are known for their chemodiversity and have been cultivated for use as culinary herbs, as well as sources of insect repellents, health-promoting compounds, and fragrance. Findings: We report the chromosome-scale genome assembly of Callicarpa americana L. (American beautyberry), a species within the early-diverging Callicarpoideae clade of Lamiaceae, known for its metallic purple fruits and use as an insect repellent due to its production of terpenoids. Using long-read sequencing and Hi-C scaffolding, we generated a 506.1-Mb assembly spanning 17 pseudomolecules with N50 contig and N50 scaffold sizes of 7.5 and 29.0 Mb, respectively. In all, 32,164 genes were annotated, including 53 candidate terpene synthases and 47 putative clusters of specialized metabolite biosynthetic pathways. Our analyses revealed 3 putative whole-genome duplication events, which, together with local tandem duplications, contributed to gene family expansion of terpene synthases. Kolavenyl diphosphate is a gateway to many of the bioactive terpenoids in C. americana; experimental validation confirmed that CamTPS2 encodes kolavenyl diphosphate synthase. Syntenic analyses with Tectona grandis L. f. (teak), a member of the Tectonoideae clade of Lamiaceae known for exceptionally strong wood resistant to insects, revealed 963 collinear blocks and 21,297 C. americana syntelogs. Conclusions: Access to the C. americana genome provides a road map for rapid discovery of genes encoding plant-derived agrichemicals and a key resource for understanding the evolution of chemical diversity in Lamiaceae.

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