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A high-capacity gene stacking toolkit for the oleaginous microalga, Nannochloropsis oceanica CCMP1779

Journal Article · · Algal Research
 [1];  [2];  [2];  [2];  [2]
  1. Michigan State Univ., East Lansing, MI (United States); OSTI
  2. Michigan State Univ., East Lansing, MI (United States)
Nannochloropsis oceanica CCMP1779 is an oleaginous heterokont microalga that is particularly amenable to synthetic biology approaches. The underlying complex genetic engineering often requires the expression of multiple transgenes (gene stacking). We integrated several techniques into a vector toolkit for multi-gene expression, including: multiple resistance marker genes, bidirectional promoters, and assembly of multiple expression cassettes into a single vector. We developed a series of gateway entry and destination vectors for assembly of two bidirectional promoter expression cassettes, which facilitates combinatorial high-capacity gene stacking. Several endogenous bidirectional promoters were demonstrated to be effective for driving transgene expression, with a dual-luciferase reporter system used to monitor transgene expression under different environmental conditions. The bidirectional promoter between the nitrate reductase and the nitrate transporter genes drives nitrogen source dependent transcription, enabling conditional transgene expression. Lethal concentrations of the antibiotics, Blasticidin, G418, and Nourseothricin, were determined and the corresponding marker genes used for genomic transformation selection.
Research Organization:
Michigan State Univ., East Lansing, MI (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-91ER20021
OSTI ID:
1800724
Alternate ID(s):
OSTI ID: 1780325
Journal Information:
Algal Research, Journal Name: Algal Research Vol. 45; ISSN 2211-9264
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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