Evidence map›Paper›PMID 9136019›Full record

ArticleGenetics1997

Natural selection and the frequency distributions of "silent" DNA polymorphism in Drosophila.

H Akashi, S W Schaeffer

Abstract read
In one paragraph

Article in Genetics, 1997. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 94 papers.

0numbers the graph read from it
0cells of the map it votes in
94citing 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

94 citing papers in PubMed.

  1. Article
  2. Dinucleotide preferences underlie apparent codon preference reversals in theProceedings of the National Academy of Sciences of the United States of America · 2025
    Article
  3. A minimal role for synonymous variation in human disease.American journal of human genetics · 2022
    Article
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34 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.

H AkashiSection of Evolution and Ecology, University of California at Davis 95616, USA. hakashi@ucdavis.edu
S W Schaeffer

Funding

MOLECULAR POPULATION GENETICS OF ADH IN DROSPHILAR29GM042472 · NIGMS · PENNSYLVANIA STATE UNIVERSITY-UNIV PARK · PI SCHAEFFER, STEPHEN W · 1989 to 1993
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NIGMS NIH HHS GM-42472
6 · The paper itself

Abstract

In Escherichia coli, Saccharomyces cerevisiae, and Drosophila melanogaster, codon bias may be maintained by a balance among mutation pressure, genetic drift, and natural selection favoring translationally superior codons. Under such an evolutionary model, silent mutations fall into two fitness categories: preferred mutations that increase codon bias and unpreferred changes in the opposite direction. This prediction can be tested by comparing the frequency spectra of synonymous changes segregating within populations; natural selection will elevate the frequencies of advantageous mutations relative to that of deleterious changes. The frequency distributions of preferred and unpreferred mutations differ in the predicted direction among 99 alleles of two D. pseudoobscura genes and five alleles of eight D. simulans genes. This result confirms the existence of fitness classes of silent mutations. Maximum likelihood estimates suggest that selection intensity at silent sites is, on average, very weak in both D. pseudoobscura and D. simulans (magnitude of NS approximately 1). Inference of evolutionary processes from within-species sequence variation is often hindered by the assumption of a stationary frequency distribution. This assumption can be avoided when identifying the action of selection and tested when estimating selection intensity.

Indexed as

Polymorphism, GeneticSelection, GeneticAnimalsCodonDNADrosophila melanogasterModels, GeneticMolecular Sequence DataCodonDNA

Identifiers

PMID9136019
PMCPMC1207945

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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.