ArticleDevelopment (Cambridge, England)2023
Hydrozoan sperm-specific SPKK motif-containing histone H2B variants stabilise chromatin with limited compaction.
Article in Development (Cambridge, England), 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
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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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Who cites it
7 citing papers in PubMed, 8 citations in OpenAlex.
- Hydra at the Crossroads of Evolution: Insights into Cell-type Diversification, Regeneration, and Epigenetic Regulation.Results and problems in cell differentiation · 2026Review
- Canonical and Variant Nucleosome Reprogramming from Sperm to Blastula.Methods in molecular biology (Clifton, N.J.) · 2025Article
- Running the gauntlet: challenges to genome integrity in spermiogenesis.Nucleus (Austin, Tex.) · 2024Review
- The protamines of the spider Steatoda sp. provide an example of liquid-liquid phase separation chromatin transitions during spermiogenesis.Development (Cambridge, England) · 2024Article
- The protamines of the noble false widow spiderbioRxiv : the preprint server for biology · 2024Article
- Protamines and the sperm nuclear basic proteins Pandora's Box of insects.Biochemistry and cell biology = Biochimie et biologie cellulaire · 2024Article
- Reproductive cytotoxic and genotoxic impact of polystyrene microplastic onCurrent research in toxicology · 2024Article
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Authors and funding
10 authors at 1 institution in 1 country.
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Abstract
Many animals achieve sperm chromatin compaction and stabilisation by replacing canonical histones with sperm nuclear basic proteins (SNBPs) such as protamines during spermatogenesis. Hydrozoan cnidarians and echinoid sea urchins lack protamines and have evolved a distinctive family of sperm-specific histone H2Bs (spH2Bs) with extended N termini rich in SPK(K/R) motifs. Echinoid sperm packaging is regulated by spH2Bs. Their sperm is negatively buoyant and fertilises on the sea floor. Hydroid cnidarians undertake broadcast spawning but their sperm properties are poorly characterised. We show that Hydractinia echinata and H. symbiolongicarpus sperm chromatin possesses higher stability than somatic chromatin, with reduced accessibility to transposase Tn5 integration and to endonucleases in vitro. In contrast, nuclear dimensions are only moderately reduced in mature Hydractinia sperm. Ectopic expression of spH2B in the background of H2B.1 knockdown results in downregulation of global transcription and cell cycle arrest in embryos, without altering their nuclear density. Taken together, SPKK-containing spH2B variants act to stabilise chromatin and silence transcription in Hydractinia sperm with only limited chromatin compaction. We suggest that spH2Bs could contribute to sperm buoyancy as a reproductive adaptation.
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