ArticleGenetics2007
Rates of recombination in the ribosomal DNA of apomictically propagated Daphnia obtusa lines.
Article in Genetics, 2007. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 23 papers.
What it found
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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.
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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.
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Who cites it
23 citing papers in PubMed, 42 citations in OpenAlex.
- Copy number and sequence variation in ribosomal DNA and the transposon, Pokey, in mutation accumulation lines of Daphnia obtusa.G3 (Bethesda, Md.) · 2026Article
- The mutation landscape of Daphnia obtusa reveals evolutionary forces shaping genome stability.Molecular biology and evolution · 2026Article
- The mutation landscape ofbioRxiv : the preprint server for biology · 2025Article
- Copy number and sequence variation in rDNA of Daphnia pulex from natural populations: insights from whole-genome sequencing.G3 (Bethesda, Md.) · 2024Article
- Intragenomic rDNA variation - the product of concerted evolution, mutation, or something in between?Heredity · 2023Review
- Analysis of Acanthamoeba genotypes from public freshwater sources in Thailand reveals a new genotype, T23 Acanthamoeba bangkokensis sp. nov.Scientific reports · 2021Article
- Evolutionary trends in animal ribosomal DNA loci: introduction to a new online database.Chromosoma · 2018Article
- Unstable Inheritance of 45S rRNA Genes inG3 (Bethesda, Md.) · 2017Article
- Distribution of the DNA transposon family, Pokey in the Daphnia pulex species complex.Mobile DNA · 2016Article
- Copy number of the transposon, Pokey, in rDNA is positively correlated with rDNA copy number in Daphnia obtuse [corrected].PloS one · 2014Article
- In and out of the rRNA genes: characterization of Pokey elements in the sequenced Daphnia genome.Mobile DNA · 2013Article
- Evolution of a transposon in Daphnia hybrid genomes.Mobile DNA · 2013Article
- Article
- Diversity and recombination of dispersed ribosomal DNA and protein coding genes in microsporidia.PloS one · 2013Article
- Copy number variation of ribosomal DNA and Pokey transposons in natural populations of Daphnia.Mobile DNA · 2012Article
- Evolutionary factors affecting Lactate dehydrogenase A and B variation in the Daphnia pulex species complex.BMC evolutionary biology · 2011Article
- WD-repeat instability and diversification of the Podospora anserina hnwd non-self recognition gene family.BMC evolutionary biology · 2010Article
- The rate of unequal crossing over in the dumpy gene from Drosophila melanogaster.Journal of molecular evolution · 2010Article
- Length variation in 18S rRNA expansion segment 43/e4 of Daphnia obtusa: ancient or recurring polymorphism?Journal of molecular evolution · 2009Article
- Nucleotide polymorphism and within-gene recombination in Daphnia magna and D. pulex, two cyclical parthenogens.Genetics · 2009Article
Corrections and comments
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Authors and funding
4 authors at 2 institutions in 2 countries.
Funding
Abstract
Ribosomal (r)DNA undergoes concerted evolution, the mechanisms of which are unequal crossing over and gene conversion. Despite the fundamental importance of these mechanisms to the evolution of rDNA, their rates have been estimated only in a few model species. We estimated recombination rate in rDNA by quantifying the relative frequency of intraindividual length variants in an expansion segment of the 18S rRNA gene of the cladoceran crustacean, Daphnia obtusa, in four apomictically propagated lines. We also used quantitative PCR to estimate rDNA copy number. The apomictic lines were sampled every 5 generations for 90 generations, and we considered each significant change in the frequency distribution of length variants between time intervals to be the result of a recombination event. Using this method, we calculated the recombination rate for this region to be 0.02-0.06 events/generation on the basis of three different estimates of rDNA copy number. In addition, we observed substantial changes in rDNA copy number within and between lines. Estimates of haploid copy number varied from 53 to 233, with a mean of 150. We also measured the relative frequency of length variants in 30 lines at generations 5, 50, and 90. Although length variant frequencies changed significantly within and between lines, the overall average frequency of each length variant did not change significantly between the three generations sampled, suggesting that there is little or no bias in the direction of change due to recombination.
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Registered trials
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