2004
DOI: 10.1002/jez.a.115
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Possible mechanisms for early and intermediate stages of sperm chromatin condensation patterning involving phase separation dynamics

Abstract: During spermiogenesis in some internally fertilizing molluscs and insects, the post-meiotic spermatid nucleus develops via a sequence of complex patterns of the nuclear contents (chromatin and nucleoplasm) on the way to final chromatin condensation. We have examined the TEM data on these sequences for three species: Philaenus spumarius(a homopteran insect), Murex brandaris (a gastropod mollusc), and Eledone cirrhosa(a cephalopod mollusc). For each of these, spatially quantitative study reveals a constant spaci… Show more

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Cited by 14 publications
(42 citation statements)
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“…1E), as in the congeneric species Nucella lapillus, where the ''sperm head consists of a cylinder of nuclear material which encloses the anterior portion of the flagellar shaft'' [Walker and MacGregor, 1968, p. 99]. The N. lamellosa sperm nuclei seen in Figure 1A-D are present in the later ''condensation'' stage of spermiogenesis [Harrison et al, 2005].…”
Section: High-pressure Freezing Versus Glutaraldehyde Fixation Of Spementioning
confidence: 95%
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“…1E), as in the congeneric species Nucella lapillus, where the ''sperm head consists of a cylinder of nuclear material which encloses the anterior portion of the flagellar shaft'' [Walker and MacGregor, 1968, p. 99]. The N. lamellosa sperm nuclei seen in Figure 1A-D are present in the later ''condensation'' stage of spermiogenesis [Harrison et al, 2005].…”
Section: High-pressure Freezing Versus Glutaraldehyde Fixation Of Spementioning
confidence: 95%
“…This takes place before the chromatin is tightly condensed in the head of the mature sperm by an ionic crystallization as, for example, in the marine snail Murex brandaris [Amor and Durfort, 1990;Càceres et al, 1994Càceres et al, , 1999Càceres et al, , 2000. Harrison et al [2005] have presented a hypothesis for this transient patterning in the M. brandaris spermatid nucleus, as well as in an octopus and an insect, based on a dynamic mechanism known as spinodal decomposition [Cahn, 1965]. In this process there is a gradual separation between two phases, chromatin and nucleoplasm, during the initial approach of the spermatid Spinodal decomposition occurs uniformly throughout the entire chromatin/nucleoplasm, as seen in glutaraldehyde-fixed spermatids of the marine snail M. brandaris and the octopus Eledone cirrhosa [Harrison et al, 2005].…”
mentioning
confidence: 97%
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“…) correlates to that of the nuclear protein transitions, and has to be considered as a well-ordered sequence of molecular structure remodeling processes (Chiva et al 2011). In each remodeling event, a structure type can disassemble and reorganize into the next structure of the remodeling process (Harrison et al 2005;Martens et al 2009). …”
Section: Nuclear Reorganization During Spermatogenesismentioning
confidence: 99%