Evidence map›Paper›PMID 32071241›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America2020

The size of the immune repertoire of bacteria.

Serena Bradde, Armita Nourmohammad, Sidhartha Goyal, Vijay Balasubramanian

Abstract read
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 27 papers.

0numbers the graph read from it
0cells of the map it votes in
27citing 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

27 citing papers in PubMed.

  1. Design principles of the cytotoxic CD8Proceedings of the National Academy of Sciences of the United States of America · 2026
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  4. Design principles of the cytotoxic CD8bioRxiv : the preprint server for biology · 2025
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  6. Review
  7. Review
  8. Article
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  16. Isolation of a virus causing a chronic infection in the archaeal model organismProceedings of the National Academy of Sciences of the United States of America · 2022
    Article
  17. Article
  18. Review
  19. Review
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4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

4 authors.

Serena BraddeAmerican Physical Society, Ridge, NY 11961; serena.bradde@gmail.com armita@uw.edu goyal@physics.utoronto.ca vijay@physics.upenn.edu.
Armita NourmohammadMax Planck Research Group (MPRG): Statistical Physics of Evolving Systems, Max Planck Institute for Dynamics and Self-Organization, 37077 Göttingen, Germany; serena.bradde@gmail.com armita@uw.edu goyal@physics.utoronto.ca vijay@physics.upenn.edu.
Sidhartha GoyalDepartment of Physics, University of Toronto, Toronto, ON M5S 1A7, Canada serena.bradde@gmail.com armita@uw.edu goyal@physics.utoronto.ca vijay@physics.upenn.edu.
Vijay BalasubramanianDavid Rittenhouse Laboratories, University of Pennsylvania, Philadelphia, PA 19104; serena.bradde@gmail.com armita@uw.edu goyal@physics.utoronto.ca vijay@physics.upenn.edu.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Some bacteria and archaea possess an immune system, based on the CRISPR-Cas mechanism, that confers adaptive immunity against viruses. In such species, individual prokaryotes maintain cassettes of viral DNA elements called spacers as a memory of past infections. Typically, the cassettes contain several dozen expressed spacers. Given that bacteria can have very large genomes and since having more spacers should confer a better memory, it is puzzling that so little genetic space would be devoted by prokaryotes to their adaptive immune systems. Here, assuming that CRISPR functions as a long-term memory-based defense against a diverse landscape of viral species, we identify a fundamental tradeoff between the amount of immune memory and effectiveness of response to a given threat. This tradeoff implies an optimal size for the prokaryotic immune repertoire in the observational range.

Indexed as

Adaptive ImmunityBacteriophagesBacteriaCRISPR-Cas Systemsadaptive immunitybacteriaCRISPR-Casoptimal memoryphage

Identifiers

PMID32071241
PMCPMC7071851

What OpenQuestion holds

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LicenceCC BY-NC-ND
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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.