Evidence map›Paper›PMID 19997068›Full record

ReviewNature reviews. Genetics2010

Origin and evolution of the adaptive immune system: genetic events and selective pressures.

Martin F Flajnik, Masanori Kasahara

Abstract readReview
In one paragraph

Review in Nature reviews. Genetics, 2010. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 435 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
435citing papers in PubMed, 1 pooled it
11.5field-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

435 citing papers in PubMed, 1 synthesis or guideline pooled it, 922 citations in OpenAlex.

  1. Pooled it
  2. Article
  3. Nucleic Acids as Emerging Regulators of Calcium Phosphate Biomineralization.FASEB journal : official publication of the Federation of American Societies for Experimental Biology · 2026
    Review
  4. Review
  5. Review
  6. Article
  7. Article
  8. Review
  9. Environmental benzene exposure induces a conserved neutrophil degranulation program across species.Toxicological sciences : an official journal of the Society of Toxicology · 2026
    Article
  10. Article
  11. Article
  12. Article
  13. Article
  14. Review
  15. Article
  16. Insights into cephalochordate genome and gene evolution from the early-diverging amphioxusProceedings of the National Academy of Sciences of the United States of America · 2026
    Article
  17. A chromosome-level genome assembly for the colonial marine hydrozoanbioRxiv : the preprint server for biology · 2026
    Article
  18. Article
  19. Article
  20. Article

375 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

2 authors at 1 institution in 1 country.

Martin F FlajnikDepartment of Microbiology and Immunology, University of Maryland at Baltimore, Baltimore, Maryland 21201, USA. mflajnik@som.umaryland.edu
Masanori Kasahara
University of Maryland, Baltimore · US

Funding

EVOLUTION OF THE MAJOR HISTOCOMPATIBILITY COMPLEXR01RR006603 · NCRR · UNIVERSITY OF MIAMI SCHOOL OF MEDICINE · PI FLAJNIK, MARTIN F · 1991 to 2011
$3.4M
ONTOGENY AND PHYLOGENY OF THE MHCR01AI027877 · NIAID · UNIVERSITY OF MIAMI SCHOOL OF MEDICINE · PI FLAJNIK, MARTIN F · 1995 to 2009
$3.2M
ONTOGENY AND PHYLOGENY OF THE MHCR29AI027877 · NIAID · UNIVERSITY OF MIAMI SCHOOL OF MEDICINE · PI FLAJNIK, MARTIN F. · 1989 to 1993
–
NCRR NIH HHS R01 RR006603NCRR NIH HHS RR006603NIAID NIH HHS AI027877NIAID NIH HHS R01 AI027877
6 · The paper itself

Abstract

The adaptive immune system (AIS) in mammals, which is centred on lymphocytes bearing antigen receptors that are generated by somatic recombination, arose approximately 500 million years ago in jawed fish. This intricate defence system consists of many molecules, mechanisms and tissues that are not present in jawless vertebrates. Two macroevolutionary events are believed to have contributed to the genesis of the AIS: the emergence of the recombination-activating gene (RAG) transposon, and two rounds of whole-genome duplication. It has recently been discovered that a non-RAG-based AIS with similarities to the jawed vertebrate AIS - including two lymphoid cell lineages - arose in jawless fish by convergent evolution. We offer insights into the latest advances in this field and speculate on the selective pressures that led to the emergence and maintenance of the AIS.

Indexed as

AnimalsCell LineageFishesHumansImmune SystemImmunityImmunoglobulinsLymphocytesMajor Histocompatibility ComplexModels, GeneticReceptors, Antigen, B-CellReceptors, Antigen, T-CellRecombination, GeneticSelection, GeneticVertebratesImmunoglobulinsReceptors, Antigen, B-CellReceptors, Antigen, T-Cell

Identifiers

PMID19997068
PMCPMC3805090
OpenAlexW2024875935

What OpenQuestion holds

Textmetadata
LicenceTDM
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.