Evidence map›Paper›PMID 17903313›Full record

ReviewGenome biology2007

The protamine family of sperm nuclear proteins.

Rod Balhorn

Open access · bronzeAbstract readReview
In one paragraph

Review in Genome biology, 2007. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 296 papers.

0numbers the graph read from it
0cells of the map it votes in
296citing papers in PubMed
15.9field-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

296 citing papers in PubMed, 760 citations in OpenAlex.

  1. Review
  2. Article
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  10. On the state of chromatin in mammalian sperm.bioRxiv : the preprint server for biology · 2026
    Article
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  15. Review
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  18. Article
  19. Review
  20. Review

236 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

1 author at 1 institution in 1 country.

Rod BalhornBiosciences and BioTechnology Division, Chemistry, Materials and Life Sciences, Lawrence Livermore National Laboratory, East Avenue, Livermore, CA 94550, USA. balhorn2@llnl.gov
Lawrence Livermore National Security · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The protamines are a diverse family of small arginine-rich proteins that are synthesized in the late-stage spermatids of many animals and plants and bind to DNA, condensing the spermatid genome into a genetically inactive state. Vertebrates have from one to 15 protamine genes per haploid genome, which are clustered together on the same chromosome. Comparison of protamine gene and amino-acid sequences suggests that the family evolved from specialized histones through protamine-like proteins to the true protamines. Structural elements present in all true protamines are a series of arginine-rich DNA-anchoring domains (often containing a mixture of arginine and lysine residues in non-mammalian protamines) and multiple phosphorylation sites. The two protamines found in mammals, P1 and P2, are the most widely studied. P1 packages sperm DNA in all mammals, whereas protamine P2 is present only in the sperm of primates, many rodents and a subset of other placental mammals. P2, but not P1, is synthesized as a precursor that undergoes proteolytic processing after binding to DNA and also binds a zinc atom, the function of which is not known. P1 and P2 are phosphorylated soon after their synthesis, but after binding to DNA most of the phosphate groups are removed and cysteine residues are oxidized, forming disulfide bridges that link the protamines together. Both P1 and P2 have been shown to be required for normal sperm function in primates and many rodents.

Indexed as

AnimalsChromosome MappingEvolution, MolecularGene Expression RegulationHumansMaleModels, GeneticNuclear ProteinsPhosphorylationProtaminesProtein Processing, Post-TranslationalSpermatozoaNuclear Proteinsprotamine P2Protamines

Identifiers

PMID17903313
PMCPMC2375014
OpenAlexW2103336074

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.