Evidence map›Paper›PMID 19513584›Full record

ArticleExtremophiles : life under extreme conditions2009

Unmarked gene deletion and host-vector system for the hyperthermophilic crenarchaeon Sulfolobus islandicus.

Ling Deng, Haojun Zhu, Zhengjun Chen, Yun Xiang Liang, Qunxin She

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Article in Extremophiles : life under extreme conditions, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 128 papers.

0numbers the graph read from it
0cells of the map it votes in
128citing papers in PubMed
–field-weighted citation impact
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

128 citing papers in PubMed.

  1. Journal of bacteriology · 2026
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  7. Complete genome sequence of the hyperthermophilic archaeonMicrobiology resource announcements · 2025
    Article
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  10. Article
  11. Article
  12. Article
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  15. Article
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  19. Article
  20. Development of a genetic system forApplied and environmental microbiology · 2024
    Article

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

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

5 authors.

Ling DengHuazhong Agricultural University, Wuhan, People's Republic of China. denling@gmail.com
Haojun Zhu
Zhengjun Chen
Yun Xiang Liang
Qunxin She

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Sulfolobus islandicus is being used as a model for studying archaeal biology, geo-biology and evolution. However, no genetic system is available for this organism. To produce an S. islandicus mutant suitable for genetic analyses, we screened for colonies with a spontaneous pyrEF mutation. One mutant was obtained containing only 233 bp of the original pyrE sequence in the mutant allele and it was used as a host to delete the beta-glycosidase (lacS) gene. Two unmarked gene deletion methods were employed, namely plasmid integration and segregation, and marker replacement and looping out, and unmarked lacS mutants were obtained by each method. A new alternative recombination mechanism, i.e., marker circularization and integration, was shown to operate in the latter method, which did not yield the designed deletion mutation. Subsequently, Sulfolobus-E. coli plasmid shuttle vectors were constructed, which genetically complemented DeltapyrEFDeltalacS mutation after transformation. Thus, a complete set of genetic tools was established for S. islandicus with pyrEF and lacS as genetic markers.

Indexed as

Archaeabeta-GalactosidaseDiploidyDNA, ArchaealGene DeletionGenetic MarkersGenetic VectorsGenotypeMutationOligonucleotidesPlasmidsRecombination, GeneticSequence Analysis, DNASulfolobusbeta-GalactosidaseDNA, ArchaealGenetic MarkersOligonucleotides

Identifiers

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Registered trials

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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.