Evidence map›Paper›PMID 31021246›Full record

ArticleThe CRISPR journal2018

Selective Maintenance of Multiple CRISPR Arrays Across Prokaryotes.

Jake L Weissman, William F Fagan, Philip L F Johnson

Abstract read
In one paragraph

Article in The CRISPR journal, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 13 papers.

0numbers the graph read from it
0cells of the map it votes in
13citing 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

13 citing papers in PubMed.

  1. Article
  2. Phage susceptibility to a minimal, modular synthetic CRISPR-Cas system inPhilosophical transactions of the Royal Society of London. Series B, Biological sciences · 2025
    Article
  3. Article
  4. Article
  5. Article
  6. Article
  7. Review
  8. Article
  9. Review
  10. Article
  11. The size of the immune repertoire of bacteria.Proceedings of the National Academy of Sciences of the United States of America · 2020
    Article
  12. Article
  13. Article
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

3 authors.

Jake L WeissmanDepartment of Biology, University of Maryland College Park , College Park, Maryland.
William F FaganDepartment of Biology, University of Maryland College Park , College Park, Maryland.
Philip L F JohnsonDepartment of Biology, University of Maryland College Park , College Park, Maryland.

Funding

Population genetic inference from the adaptive immune systemR00GM104158 · NIGMS · UNIV OF MARYLAND, COLLEGE PARK · PI JOHNSON, PHILIP LEE FALK · 2015 to 2017
$747k
NIGMS NIH HHS R00 GM104158
6 · The paper itself

Abstract

Prokaryotes are under nearly constant attack by viral pathogens. To protect against this threat of infection, bacteria and archaea have evolved a wide array of defense mechanisms, singly and in combination. While immune diversity in a single organism likely reduces the chance of pathogen evolutionary escape, it remains puzzling why many prokaryotes also have multiple, seemingly redundant, copies of the same type of immune system. Here, we focus on the highly flexible CRISPR adaptive immune system, which is present in multiple copies in a surprising 28% of the prokaryotic genomes in RefSeq. We use a comparative genomics approach looking across all prokaryotes to demonstrate that on average, organisms are under selection to maintain more than one CRISPR array. Given this surprising conclusion, we consider several hypotheses concerning the source of selection and include a theoretical analysis of the possibility that a trade-off between memory span and learning speed could select for both "long-term memory" and "short-term memory" CRISPR arrays.

Identifiers

PMID31021246
PMCPMC6342168

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.