Evidence map›Paper›PMID 19196725›Full record

ArticleGenome research2009

Two duplicated P450 genes are associated with pyrethroid resistance in Anopheles funestus, a major malaria vector.

Charles S Wondji, Helen Irving, John Morgan, Neil F Lobo, Frank H Collins, Richard H Hunt, Maureen Coetzee, Janet Hemingway, Hilary Ranson

Open access · bronzeAbstract read
In one paragraph

Article in Genome research, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 138 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
138citing papers in PubMed, 2 pooled it
–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

138 citing papers in PubMed, 2 syntheses or guidelines pooled it, 261 citations in OpenAlex.

  1. Pooled it
  2. Pooled it
  3. Article
  4. Genomic signatures of selection inbioRxiv : the preprint server for biology · 2026
    Article
  5. Article
  6. Article
  7. Article
  8. Article
  9. Complex Roles of Insect Cytochrome P450s in Chemical Adaptation.International journal of biological sciences · 2026
    Review
  10. Article
  11. Article
  12. Article
  13. Review
  14. Article
  15. Article
  16. Article
  17. Article
  18. Article
  19. Functional Validation of Endogenous Redox PartnerInternational journal of molecular sciences · 2024
    Article
  20. Article

78 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

9 authors at 3 institutions in 3 countries.

Charles S WondjiLiverpool School of Tropical Medicine, Liverpool, L3 5QA, United Kingdom. c.s.wondji@liverpool.ac.uk
Helen Irving
John Morgan
Neil F Lobo
Frank H Collins
Richard H Hunt
Maureen Coetzee
Janet Hemingway
Hilary Ranson
Liverpool School of Tropical Medicine · GBUniversity of Notre Dame · USUniversity of the Witwatersrand · ZA

Funding

PHS HHS IU01 A1058271-01Wellcome Trust
6 · The paper itself

Abstract

Pyrethroid resistance in Anopheles funestus is a potential obstacle to malaria control in Africa. Tools are needed to detect resistance in field populations. We have been using a positional cloning approach to identify the major genes conferring pyrethroid resistance in this vector. A quantitative trait locus (QTL) named rp1 explains 87% of the genetic variance in pyrethroid susceptibility in two families from reciprocal crosses between susceptible and resistant strains. Two additional QTLs of minor effect, rp2 and rp3, were also detected. We sequenced a 120-kb BAC clone spanning the rp1 QTL and identified 14 protein-coding genes and one putative pseudogene. Ten of the 14 genes encoded cytochrome P450s, and expression analysis indicated that four of these P450s were differentially expressed between susceptible and resistant strains. Furthermore, two of these genes, CYP6P9 and CYP6P4, which are 25 and 51 times overexpressed in resistant females, are tandemly duplicated in the BAC clone as well as in laboratory and field samples, suggesting that P450 gene duplication could contribute to pyrethroid resistance in An. funestus. Single nucleotide polymorphisms (SNPs) were identified within CYP6P9 and CYP6P4, and genotyping of the progeny of the genetic crosses revealed a maximum penetrance value f(2) = 1, confirming that these SNPs are valid resistance markers in the laboratory strains. This serves as proof of principle that a DNA-based diagnostic test could be designed to trace metabolic resistance in field populations. This will be a major advance for insecticide resistance management in malaria vectors, which requires the early detection of resistance alleles.

Indexed as

Gene DuplicationAnimalsAnophelesChromosome MappingChromosomesCytochrome P-450 Enzyme SystemFemaleGene Expression ProfilingInsecticide ResistanceInsect VectorsMalariaPolymorphism, Single NucleotidePyrethrinsQuantitative Trait LociCytochrome P-450 Enzyme SystemPyrethrins

Identifiers

PMID19196725
PMCPMC2661802
OpenAlexW2095277223

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.