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Title: Protein expression and gene editing in monocots using foxtail mosaic virus vectors

Journal Article · · Plant Direct
DOI:https://doi.org/10.1002/pld3.181· OSTI ID:1670835
 [1];  [1];  [2];  [2];  [3];  [2];  [1]
  1. Department of Plant Pathology and Microbiology Iowa State University Ames IA USA
  2. Department of Genetics, Cell Biology and Development Center for Genome Engineering Center for Precision Plant Genomics University of Minnesota St. Paul MN USA
  3. Department of Genetics, Development and Cell Biology Iowa State University Ames IA USA

Plant viruses can be engineered to carry sequences that direct silencing of target host genes, expression of heterologous proteins, or editing of host genes. A set of foxtail mosaic virus (FoMV) vectors was developed that can be used for transient gene expression and single guide RNA delivery for Cas9-mediated gene editing in maize, Setaria viridis, and Nicotiana benthamiana. This was accomplished by duplicating the FoMV capsid protein subgenomic promoter, abolishing the unnecessary open reading frame 5A, and inserting a cloning site containing unique restriction endonuclease cleavage sites immediately after the duplicated promoter. The modified FoMV vectors transiently expressed green fluorescent protein (GFP) and bialaphos resistance (BAR) protein in leaves of systemically infected maize seedlings. GFP was detected in epidermal and mesophyll cells by epifluorescence microscopy, and expression was confirmed by Western blot analyses. Plants infected with FoMV carrying the bar gene were temporarily protected from a glufosinate herbicide, and expression was confirmed using a rapid antibody-based BAR strip test. Expression of these proteins was stabilized by nucleotide substitutions in the sequence of the duplicated promoter region. Single guide RNAs expressed from the duplicated promoter mediated edits in the N. benthamiana Phytoene desaturase gene, the S. viridis Carbonic anhydrase 2 gene, and the maize HKT1 gene encoding a potassium transporter. The efficiency of editing was enhanced in the presence of synergistic viruses and a viral silencing suppressor. This work expands the utility of FoMV for virus-induced gene silencing (VIGS), virus-mediated overexpression (VOX), and virus-enabled gene editing (VEdGE) in monocots.

Research Organization:
Donald Danforth Plant Science Center, St. Louis, MO (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
DE‐SC0018277; SC0018277
OSTI ID:
1670835
Alternate ID(s):
OSTI ID: 1670840; OSTI ID: 1803339; OSTI ID: 2308797
Journal Information:
Plant Direct, Journal Name: Plant Direct Vol. 3 Journal Issue: 11; ISSN 2475-4455
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
United Kingdom
Language:
English

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