Evidence map›Paper›PMID 12495506›Full record

ArticleProceedings. Biological sciences2002

Functional and ecological significance of rDNA intergenic spacer variation in a clonal organism under divergent selection for production rate.

Elena Gorokhova, Thomas E Dowling, Lawrence J Weider, Teresa J Crease, James J Elser

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In one paragraph

Article in Proceedings. Biological sciences, 2002. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 23 papers.

0numbers the graph read from it
0cells of the map it votes in
23citing papers in PubMed
5.3field-weighted citation impact, top 5% 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

23 citing papers in PubMed, 95 citations in OpenAlex.

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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

5 authors at 3 institutions in 2 countries.

Elena GorokhovaDepartment of Biology, Arizona State University, Tempe, AZ 85287-1501, USA. elenag@system.ecology.su.se
Thomas E Dowling
Lawrence J Weider
Teresa J Crease
James J Elser
Arizona State University · USUniversity of Guelph · CAUniversity of Oklahoma · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

It has recently been hypothesized that variation in the intergenic spacer (IGS) of rDNA has considerable developmental, evolutionary and ecological significance through effects on growth rate and body C : N : P stoichiometry resulting from the role of the IGS in production of rRNA. To test these ideas, we assessed changes in size and structure of the repetitive region of the IGS, juvenile growth rate (JGR), RNA and phosphorus (P) contents in clonal lineages of Daphnia pulex derived from a single female and subjected to divergent selection on weight-specific fecundity (WSF). As a result of selection, WSF diverged rapidly, with significant reductions within two generations. Other significant changes accompanying shifts in WSF were that juveniles produced by low-WSF females grew more rapidly and had higher RNA and P contents. An increased predominance of long IGS variants was observed in lineages with elevated JGRs and low WSF. The observed variations in IGS length were related to the number of subrepeat units carrying a promoter sequence in the repetitive region. These results strongly support the hypothesized relationships, indicate a genetic mechanism for the evolution of such associations and demonstrate that Daphnia (and perhaps other parthenogens) possess considerable potential for rapid adaptive change in major life-history traits.

Indexed as

EcosystemGenetic VariationAdaptation, PhysiologicalAnimalsBiological EvolutionDaphniaDNA, Ribosomal SpacerFemaleGenotypeLife Cycle StagesMolecular Sequence DataPhosphorusRNA, RibosomalSelection, GeneticSequence Analysis, DNADNA, Ribosomal SpacerPhosphorusRNA, Ribosomal

Identifiers

PMID12495506
PMCPMC1691159
OpenAlexW1966964286

What OpenQuestion holds

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Registered trials

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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.