Evidence map›Paper›PMID 16293688›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America2005

Self renewal, expansion, and transfection of rat spermatogonial stem cells in culture.

F Kent Hamra, Karen M Chapman, Derek M Nguyen, Ashley A Williams-Stephens, Robert E Hammer, David L Garbers

Open access · greenAbstract readComparative Study
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 2005. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 94 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
94citing papers in PubMed, 1 pooled it
14.2field-weighted citation impact, top 1% 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

94 citing papers in PubMed, 1 synthesis or guideline pooled it, 209 citations in OpenAlex.

  1. Guideline
  2. Trial
  3. Article
  4. Article
  5. Article
  6. Article
  7. Article
  8. Rattus norvegicus Spermatogenesis Colony-Forming Assays.Methods in molecular biology (Clifton, N.J.) · 2023
    Article
  9. Perspectives: Methods for Evaluating Primate Spermatogonial Stem Cells.Methods in molecular biology (Clifton, N.J.) · 2023
    Article
  10. Primary Cultures of Spermatogonia and Testis Cells.Methods in molecular biology (Clifton, N.J.) · 2023
    Article
  11. Review
  12. Review
  13. Article
  14. Review
  15. Review
  16. Article
  17. Spermatogonial Stem Cell Transplantation in Large Animals.Animals : an open access journal from MDPI · 2021
    Review
  18. Review
  19. Article
  20. Review

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

6 authors at 3 institutions in 1 country.

F Kent HamraThe Cecil H. and Ida Green Center for Reproductive Biology Sciences, Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, TX 75390-9051, USA. kent.hamra@utsouthwestern.edu
Karen M Chapman
Derek M Nguyen
Ashley A Williams-Stephens
Robert E Hammer
David L Garbers
Southwestern Medical Center · USHoward Hughes Medical Institute · USThe University of Texas Southwestern Medical Center · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The use of a transgenic line of rats that express enhanced GFP (EGFP) exclusively in the germ line has allowed a separation of feeder layers and contaminating testis somatic cells from germ cells and the identification of a set of spermatogonial stem cell marker transcripts. With these molecular markers as a guide, we have now devised culture conditions where rat spermatogonial stem cells renew and proliferate in culture with a doubling time between 3 and 4 days. The marker transcripts increase in relative abundance as a function of time in culture, and the stem cells retain competency to colonize and develop into spermatids after transplantation to the testes of recipient rats. The cells also remain euploid after at least 12 passages. Cell lines could be isolated and cryopreserved and, upon subsequent thawing, continue to self renew. Transfection of the spermatogonial stem cells with a plasmid containing the neomycin phosphotransferase (neo) selectable marker resulted in selection of G418-resistant cell lines that effectively colonize recipient testes, suggesting that gene targeting is now feasible in the rat.

Indexed as

Cell ProliferationAnimalsCell Culture TechniquesFlow CytometryGentamicinsGreen Fluorescent ProteinsKanamycin KinaseMalePlasmidsRatsSpermatogoniaStem CellsTestisTransfectionantibiotic G 418enhanced green fluorescent proteinGentamicinsGreen Fluorescent ProteinsKanamycin Kinase

Identifiers

PMID16293688
PMCPMC1283987
OpenAlexW2155882858

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.