Evidence map›Paper›PMID 25122669›Full record

ArticleG3 (Bethesda, Md.)2014

Evidence of hermaphroditism and sex ratio distortion in the fungal feeding nematode Bursaphelenchus okinawaensis.

Ryoji Shinya, Koichi Hasegawa, Anthony Chen, Natsumi Kanzaki, Paul W Sternberg

Abstract read
In one paragraph

Article in G3 (Bethesda, Md.), 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers.

0numbers the graph read from it
0cells of the map it votes in
16citing 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

16 citing papers in PubMed.

  1. Evolution of parasitism-related traits in nematodes.bioRxiv : the preprint server for biology · 2025
    Article
  2. Review
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  4. How didFrontiers in physiology · 2023
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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.

Ryoji ShinyaHoward Hughes Medical Institute and Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, California 91125 Department of the Environmental Biology, College of Bioscience and Biotechnology, Chubu University, Kasugai 487-8501 Japan.
Koichi HasegawaDepartment of the Environmental Biology, College of Bioscience and Biotechnology, Chubu University, Kasugai 487-8501 Japan.
Anthony ChenHoward Hughes Medical Institute and Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, California 91125.
Natsumi KanzakiForestry and Forest Products Research Institute, Tsukuba 305-8687, Japan.
Paul W SternbergHoward Hughes Medical Institute and Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, California 91125 pws@caltech.edu.ORCID http://orcid.org/0000-0002-7699-0173

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Nematodes have many different reproductive strategies along with their divergent life histories; the ability of hermaphrodite to self- and cross-fertilize is useful for genetic manipulation. Here, we demonstrate the hermaphroditism of the fungal feeding nematode Bursaphelenchus okinawaensis, which was formerly described as a parthenogenetic nematode, and we show its other unique sexual characteristics. To determine that it is hermaphroditic, we performed the following experiments: observation of the pronuclear and chromosome behavior during oogenesis and early embryogenesis; observation of spermatogenesis during the fourth larval stage; investigation of sperm utilization; and investigation of phenotypic segregation after cross-mating using a chemically induced visible mutant. We then investigated the mating preferences and spermatid size difference between males and hermaphrodites. B. okinawaensis males successfully mated only with sperm-depleted old hermaphrodites, and the spermatid sizes of males were almost the same as those of hermaphrodites. Moreover, the sex ratio of cross-fertilized progeny was highly skewed toward hermaphrodites. B. okinawaensis is phylogenetically distant from established model nematodes such as C. elegans and is more closely related to some economically relevant parasitic nematodes. This newly discovered hermaphroditic nematode has great potential for evolutionary and parasitological research.

Indexed as

Sex RatioAnimalsChromatidsDisorders of Sex DevelopmentEmbryonic DevelopmentEthyl MethanesulfonateFertilizationHermaphroditic OrganismsLarvaMaleMutagenesisNematodaOocytesPhenotypeSaccharomyces cerevisiaeSelf-FertilizationEthyl Methanesulfonateearly embryogenesisgeneticshermaphroditismnematodesatellite model

Identifiers

PMID25122669
PMCPMC4199697

What OpenQuestion holds

Textmetadata
LicenceCC BY
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.