Evidence map›Paper›PMID 22509035›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America2012

Refactoring the nitrogen fixation gene cluster from Klebsiella oxytoca.

Karsten Temme, Dehua Zhao, Christopher A Voigt

Open access · bronzeAbstract read
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 168 papers.

0numbers the graph read from it
0cells of the map it votes in
168citing papers in PubMed
23.4field-weighted citation impact, top 1% 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

168 citing papers in PubMed, 454 citations in OpenAlex.

  1. ModifiedMicroorganisms · 2026
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  7. Microbial Biotechnology in Agriculture.Progress in molecular and subcellular biology · 2026
    Review
  8. Review
  9. Article
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  11. Review
  12. The design and engineering of synthetic genomes.Nature reviews. Genetics · 2025
    Review
  13. AACS synthetic biology · 2025
    Article
  14. Article
  15. Article
  16. Review
  17. Article
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  20. Review

108 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

3 authors at 3 institutions in 2 countries.

Karsten TemmeJoint Graduate Group in Bioengineering, University of California, Berkeley/University of California, San Francisco, CA 94158, USA.
Dehua Zhao
Christopher A Voigt
Graduate Theological Union · USIntelligent Synthetic Biology Center · KRMassachusetts Institute of Technology · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Bacterial genes associated with a single trait are often grouped in a contiguous unit of the genome known as a gene cluster. It is difficult to genetically manipulate many gene clusters because of complex, redundant, and integrated host regulation. We have developed a systematic approach to completely specify the genetics of a gene cluster by rebuilding it from the bottom up using only synthetic, well-characterized parts. This process removes all native regulation, including that which is undiscovered. First, all noncoding DNA, regulatory proteins, and nonessential genes are removed. The codons of essential genes are changed to create a DNA sequence as divergent as possible from the wild-type (WT) gene. Recoded genes are computationally scanned to eliminate internal regulation. They are organized into operons and placed under the control of synthetic parts (promoters, ribosome binding sites, and terminators) that are functionally separated by spacer parts. Finally, a controller consisting of genetic sensors and circuits regulates the conditions and dynamics of gene expression. We applied this approach to an agriculturally relevant gene cluster from Klebsiella oxytoca encoding the nitrogen fixation pathway for converting atmospheric N(2) to ammonia. The native gene cluster consists of 20 genes in seven operons and is encoded in 23.5 kb of DNA. We constructed a "refactored" gene cluster that shares little DNA sequence identity with WT and for which the function of every genetic part is defined. This work demonstrates the potential for synthetic biology tools to rewrite the genetics encoding complex biological functions to facilitate access, engineering, and transferability.

Indexed as

Genes, BacterialMultigene FamilyBase SequenceDNA, BacterialGene Expression Regulation, BacterialGene Knockout TechniquesGenetic TechniquesKlebsiella oxytocaNitrogenaseNitrogen FixationOperonOxidoreductasesPlasmidsPromoter Regions, GeneticRibosomesDNA, BacterialNitrogenasenitrogenase reductaseOxidoreductases

Identifiers

PMID22509035
PMCPMC3345007
OpenAlexW2086232077

What OpenQuestion holds

Textmetadata
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.