AustralieFrV1, Main, Exploration, bibRecord, 00CE54

Isolation of histones and related chromatin structures from spermatozoa nuclei of a dasyurid marsupial, Sminthopsis crassicaudata

Identifieur interne : 00CE54 ( Main/Exploration ); précédent : 00CE53; suivant : 00CE55

Isolation of histones and related chromatin structures from spermatozoa nuclei of a dasyurid marsupial, Sminthopsis crassicaudata

Auteurs : L. L. L. Soon [États-Unis] ; J. Ausio [Canada] ; W. G. Breed [Australie] ; J. H. T. Power [Australie] ; S. Muller [France]

Source :

Journal of Experimental Zoology [ 0022-104X ] ; 1997-08-01.

RBID : ISTEX:F789E6AFEF64350A266E906BC6C46DD9617CBD7E

Descripteurs français

Wicri :
- topic : étiquetage, Marsupial.

English descriptors

Abstract

The spermatozoa of a dasyurid marsupial, Sminthopsis crassicaudata, have two distinct nuclear regions: uniformly electron‐dense chromatin (C1) in the interior and fissured chromatin (C2) at the periphery. To investigate whether the differences in morphology are due to incorporation of different packaging proteins, spermatozoa nuclear proteins were characterised by acetic acid‐urea polyacrylamide gel electrophoresis (PAGE) and fractionated by reverse‐phase high‐pressure liquid chromatography (HPLC). The main protein component was protamine I, but a complete histone complement (H1, H2A, H2B, H3, and H4) was also detected. Immunocytochemistry showed localisation of H4, H2B, and H2A histones to the periphery of the nuclei, a region that corresponded to the C2 chromatin. The fissures in the chromatin of this region disappeared following incubation with fish protamines, indicating that the nucleohistone C2 region may be incompletely condensed relative to nucleoprotamines. This observation is consistent with the view that 60% of phosphodiester charges remain negative in nucleohistone DNA, whereas all DNA charges are neutralised in highly compact nucleoprotamines. Treatment of spermatozoa with micrococcal nuclease showed that the C1 chromatin was resistant to digestion, whereas the C2 region was cleaved into 30‐ to 38‐nm agglomerates and 11‐nm nucleosomal‐size structures. Thus, this study demonstrates that spermatozoa nuclei of this marsupial species contain peripherally localised histones, and the nucleohistone chromatin accounts for the different morphology of the C2 region compared with the rest of the nucleus. J. Exp. Zool. 278:322–332, 1997. © 1997 Wiley‐Liss, Inc.

Url:

https://api.istex.fr/document/F789E6AFEF64350A266E906BC6C46DD9617CBD7E/fulltext/pdf

DOI: 10.1002/(SICI)1097-010X(19970801)278:5<322::AID-JEZ6>3.0.CO;2-R

Affiliations:

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Le document en format XML

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<author><name sortKey="Breed, W G" sort="Breed, W G" uniqKey="Breed W" first="W. G." last="Breed">W. G. Breed</name>
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<author><name sortKey="Power, J H T" sort="Power, J H T" uniqKey="Power J" first="J. H. T." last="Power">J. H. T. Power</name>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Acetic</term>
<term>Acetic acid</term>
<term>Apical</term>
<term>Ausio</term>
<term>Balhorn</term>
<term>Basic proteins</term>
<term>Biol</term>
<term>Boar</term>
<term>Caput</term>
<term>Cauda</term>
<term>Cauda epididymides</term>
<term>Cell biol</term>
<term>Chromatin</term>
<term>Chromatin condensation</term>
<term>Chromatin region</term>
<term>Crassicaudata</term>
<term>Dasyurid</term>
<term>Dasyurid marsupial</term>
<term>Demembranated sperm</term>
<term>Electron microscopy</term>
<term>Epididymal</term>
<term>Epididymis</term>
<term>Fish protamines</term>
<term>Histone</term>
<term>Histone antibodies</term>
<term>Labelling</term>
<term>Marsupial</term>
<term>Micrococcal</term>
<term>Micrococcal nuclease</term>
<term>Micrococcal nuclease digestion</term>
<term>Nuclear condensation</term>
<term>Nuclear envelope</term>
<term>Nuclear regions</term>
<term>Nuclease</term>
<term>Pellet</term>
<term>Posterior regions</term>
<term>Present study</term>
<term>Protamine</term>
<term>Room temperature</term>
<term>Sigma</term>
<term>Sminthopsis</term>
<term>Sminthopsis crassicaudata</term>
<term>Sminthopsis protamine</term>
<term>Sminthopsis spermatozoa</term>
<term>Snbps</term>
<term>Somatic histones</term>
<term>Sperm</term>
<term>Sperm chromatin</term>
<term>Sperm nuclei</term>
<term>Spermatozoa chromatin</term>
<term>Spermatozoa histones</term>
<term>Spermatozoa nuclei</term>
<term>Spermatozoon</term>
<term>Spermatozoon head</term>
<term>Spermiogenesis</term>
<term>Transmission electron microscope</term>
</keywords>
<keywords scheme="Teeft" xml:lang="en"><term>Acetic</term>
<term>Acetic acid</term>
<term>Apical</term>
<term>Ausio</term>
<term>Balhorn</term>
<term>Basic proteins</term>
<term>Biol</term>
<term>Boar</term>
<term>Caput</term>
<term>Cauda</term>
<term>Cauda epididymides</term>
<term>Cell biol</term>
<term>Chromatin</term>
<term>Chromatin condensation</term>
<term>Chromatin region</term>
<term>Crassicaudata</term>
<term>Dasyurid</term>
<term>Dasyurid marsupial</term>
<term>Demembranated sperm</term>
<term>Electron microscopy</term>
<term>Epididymal</term>
<term>Epididymis</term>
<term>Fish protamines</term>
<term>Histone</term>
<term>Histone antibodies</term>
<term>Labelling</term>
<term>Marsupial</term>
<term>Micrococcal</term>
<term>Micrococcal nuclease</term>
<term>Micrococcal nuclease digestion</term>
<term>Nuclear condensation</term>
<term>Nuclear envelope</term>
<term>Nuclear regions</term>
<term>Nuclease</term>
<term>Pellet</term>
<term>Posterior regions</term>
<term>Present study</term>
<term>Protamine</term>
<term>Room temperature</term>
<term>Sigma</term>
<term>Sminthopsis</term>
<term>Sminthopsis crassicaudata</term>
<term>Sminthopsis protamine</term>
<term>Sminthopsis spermatozoa</term>
<term>Snbps</term>
<term>Somatic histones</term>
<term>Sperm</term>
<term>Sperm chromatin</term>
<term>Sperm nuclei</term>
<term>Spermatozoa chromatin</term>
<term>Spermatozoa histones</term>
<term>Spermatozoa nuclei</term>
<term>Spermatozoon</term>
<term>Spermatozoon head</term>
<term>Spermiogenesis</term>
<term>Transmission electron microscope</term>
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<keywords scheme="Wicri" type="topic" xml:lang="fr"><term>étiquetage</term>
<term>Marsupial</term>
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<front><div type="abstract" xml:lang="en">The spermatozoa of a dasyurid marsupial, Sminthopsis crassicaudata, have two distinct nuclear regions: uniformly electron‐dense chromatin (C1) in the interior and fissured chromatin (C2) at the periphery. To investigate whether the differences in morphology are due to incorporation of different packaging proteins, spermatozoa nuclear proteins were characterised by acetic acid‐urea polyacrylamide gel electrophoresis (PAGE) and fractionated by reverse‐phase high‐pressure liquid chromatography (HPLC). The main protein component was protamine I, but a complete histone complement (H1, H2A, H2B, H3, and H4) was also detected. Immunocytochemistry showed localisation of H4, H2B, and H2A histones to the periphery of the nuclei, a region that corresponded to the C2 chromatin. The fissures in the chromatin of this region disappeared following incubation with fish protamines, indicating that the nucleohistone C2 region may be incompletely condensed relative to nucleoprotamines. This observation is consistent with the view that 60% of phosphodiester charges remain negative in nucleohistone DNA, whereas all DNA charges are neutralised in highly compact nucleoprotamines. Treatment of spermatozoa with micrococcal nuclease showed that the C1 chromatin was resistant to digestion, whereas the C2 region was cleaved into 30‐ to 38‐nm agglomerates and 11‐nm nucleosomal‐size structures. Thus, this study demonstrates that spermatozoa nuclei of this marsupial species contain peripherally localised histones, and the nucleohistone chromatin accounts for the different morphology of the C2 region compared with the rest of the nucleus. J. Exp. Zool. 278:322–332, 1997. © 1997 Wiley‐Liss, Inc.</div>
</front>
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Isolation of histones and related chromatin structures from spermatozoa nuclei of a dasyurid marsupial, Sminthopsis crassicaudata

Isolation of histones and related chromatin structures from spermatozoa nuclei of a dasyurid marsupial, Sminthopsis crassicaudata

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

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