Evidence map›Paper›PMID 32807825›Full record

ArticleScientific reports2020

Plasmid-based complementation of large deletions in Phaeodactylum tricornutum biosynthetic genes generated by Cas9 editing.

Samuel S Slattery, Helen Wang, Daniel J Giguere, Csanad Kocsis, Bradley L Urquhart, Bogumil J Karas, David R Edgell

Open access · goldAbstract read
In one paragraph

Article in Scientific reports, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers.

0numbers the graph read from it
0cells of the map it votes in
11citing papers in PubMed
0.9field-weighted citation impact, top 30% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

11 citing papers in PubMed, 29 citations in OpenAlex.

  1. Article
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  4. Genetic engineering in diatoms: advances and prospects.The Plant journal : for cell and molecular biology · 2025
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

7 authors at 1 institution in 1 country.

Samuel S SlatteryDepartment of Biochemistry, Schulich School of Medicine and Dentistry, Western University, London, Canada.
Helen WangDepartment of Biochemistry, Schulich School of Medicine and Dentistry, Western University, London, Canada.
Daniel J GiguereDepartment of Biochemistry, Schulich School of Medicine and Dentistry, Western University, London, Canada.
Csanad KocsisDepartment of Biochemistry, Schulich School of Medicine and Dentistry, Western University, London, Canada.
Bradley L UrquhartDepartment of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, Western University, London, Canada.
Bogumil J KarasDepartment of Biochemistry, Schulich School of Medicine and Dentistry, Western University, London, Canada.
David R EdgellDepartment of Biochemistry, Schulich School of Medicine and Dentistry, Western University, London, Canada. dedgell@uwo.ca.
Western University · CA

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The model diatom Phaeodactylum tricornutum is an attractive candidate for synthetic biology applications. Development of auxotrophic strains of P. tricornutum would provide alternative selective markers to commonly used antibiotic resistance genes. Here, using CRISPR/Cas9, we show successful editing of genes in the uracil, histidine, and tryptophan biosynthetic pathways. Nanopore long-read sequencing indicates that editing events are characterized by the occurrence of large deletions of up to ~ 2.7 kb centered on the editing site. The uracil and histidine-requiring phenotypes can be complemented by plasmid-based copies of the intact genes after curing of the Cas9-editing plasmid. Growth of uracil auxotrophs on media supplemented with 5-fluoroorotic acid and uracil results in loss of the complementing plasmid, providing a facile method for plasmid curing with potential applications in strain engineering and CRISPR editing. Metabolomic characterization of uracil auxotrophs revealed changes in cellular orotate concentrations consistent with partial or complete loss of orotate phosphoribosyltransferase activity. Our results expand the range of P. tricornutum auxotrophic strains and demonstrate that auxotrophic complementation markers provide a viable alternative to traditionally used antibiotic selection markers. Plasmid-based auxotrophic markers should expand the range of genome engineering applications and provide a means for biocontainment of engineered P. tricornutum strains.

Indexed as

CRISPR-Cas SystemsGene DeletionAscomycotaComplement System ProteinsDrug Resistance, BacterialGene EditingGenetic EngineeringHistidineOrotate PhosphoribosyltransferasePlasmidsTryptophanUracilComplement System ProteinsHistidineOrotate PhosphoribosyltransferaseTryptophanUracil

Identifiers

PMID32807825
PMCPMC7431573
OpenAlexW3049560402

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.