Studies in mammalian spermatogenesis. III. The fate of the chromatin‐nucleolus in the opossum

Painter, Theophilus S.

doi:10.1002/jez.1400390203

Cited by 25 publications

(3 citation statements)

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“…Bar: 2/~m. observed in L. crassicaudata at diffuse stage and diplotene (Figs 10 and 12) has also been observed in other marsupial species (Painter, 1924;Solari & Bianchi, 1975;Fernandez Donoso, 1982). Solari and Bianchi (1975) suggested that polarization is involved in the approaching of X and Y before pairing.…”

Section: Discussionmentioning

confidence: 73%

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The meiotic behaviour of the XY pair in Lutreolina crassicaudata (Marsupialia: Didelphoidea)

Roche¹,

Seluja

Wettstein³

1986

Genetica

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The meiotic behaviour of the XY pair of the didelphid Lutreolina crassicaudata is analyzed by microspreading of spermatocytes for visualization of chromosomal axes and by three-dimensional reconstruction of spermatocyte nuclei from EM thin sections. The delay in pairing of sex chromosomes compared to autosomes and the absence of a synaptonemal complex between the axes of the X and Y chromosomes, already described for South American marsupials by three-dimensional reconstruction and for Australian species with synaptonemal complex microspreadings, is confirmed for this species. Sections demonstrate that at the diffuse stage and diplotene the dense plate occupies the region of the inner face of the nuclear envelope in contact with the XY body. Spreads show an structure similar in staining to the axes that becomes apparent simultaneously with the dense plate, called a balloon. The mechanism of XY pairing during meiotic prophase appears to be common to American and Australian marsupials as the same morphological pattern is found in all the species described. This mechanism is different from the way of pairing and segregation known for eutherian sex chromosomes.

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Section: Discussionmentioning

confidence: 73%

“…Usually an end-to-end association is observed at diplotene, diakinesis and metaphase I of eutherian and marsupial species (Painter, 1924;Solari, 1974). Solari (1974), as other authors, has considered that this end-to-end association represents a terminal chiasma.…”

Section: Nementioning

confidence: 99%

The meiotic behaviour of the XY pair in Lutreolina crassicaudata (Marsupialia: Didelphoidea)

Roche¹,

Seluja

Wettstein³

1986

Genetica

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“…In contrast to the fetal meiosis of female germ cells, male germ cells enter a period of mitotic arrest. This lasts until shortly after birth, when prespermatogonia begin to proliferate mitotically, and stem cells GAMETOGENESIS IS SEXUALLY DIMORPHIC 10 differentiate into spermatogonia, which ultimately give rise, with the onset of puberty, to meiotic spermatocytes. Prophase is long, and there are uniquely spermatogenic aspects of the behavior of sex chromosomes and the response to chromosome anomalies.…”

Section: Introductionmentioning

confidence: 99%

Role of Sex Chromosomes in the Control of Male Germ‐Cell Differentiation^a

Handel

Hunt

Kot

et al. 1991

Annals of the New York Academy of Sciences

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The spermatogenesis of the pribilof fur seal (Callorhinus Alascanus Jordan and Clark)

Starks

1928

Am. J. Anat.

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THREE PLATES (FIFTY-SEVEN FIGURES)The material assigned to me by Dr. F. M. McFarland for this study was preserved in the Pribilof Islands by Mr. G. A.Clark, special assistant in charge of fur seal investigations, and consists of small portions of freshly preserved testes of three-and eight-year-old fur seals, Callorhinus alascanus Jordan and Clark. All stages are found in material from each individual, and correlated with findings in testes from other ages put up some years previously by Mr. Clark, so that observations are based upon a study of preparations from both individuals. TECHNIQUEThe fixatives used were strong and weak Flemming. Bouin 's picro-f orrnalin acetic, sublimate-alcohol-acetic, Hermann's fluid, and saturated corrosive sublimate, the best results being obtained from Flemming's and Hermann's fisation. Paraffin serial sections were cut ranging from 3 t o 10 p in thickness, 5 p being found most satisfactory. Of the stains used, iron haematoxylin without counterstain gave the best definition. Chromotrope 2B, acid fuchsin, orange G, were good counterstains, while safranin, Mann's methyl-blue eosinate, Flemming's triple stain, and Delafield's haematoxylin were used in investigating certain points. 471

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Studies in mammalian spermatogenesis. III. The fate of the chromatin‐nucleolus in the opossum

Cited by 25 publications

References 11 publications

The meiotic behaviour of the XY pair in Lutreolina crassicaudata (Marsupialia: Didelphoidea)

The meiotic behaviour of the XY pair in Lutreolina crassicaudata (Marsupialia: Didelphoidea)

Role of Sex Chromosomes in the Control of Male Germ‐Cell Differentiation^a

The spermatogenesis of the pribilof fur seal (Callorhinus Alascanus Jordan and Clark)

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Studies in mammalian spermatogenesis. III. The fate of the chromatin‐nucleolus in the opossum

Cited by 25 publications

References 11 publications

The meiotic behaviour of the XY pair in Lutreolina crassicaudata (Marsupialia: Didelphoidea)

The meiotic behaviour of the XY pair in Lutreolina crassicaudata (Marsupialia: Didelphoidea)

Role of Sex Chromosomes in the Control of Male Germ‐Cell Differentiationa

The spermatogenesis of the pribilof fur seal (Callorhinus Alascanus Jordan and Clark)

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Role of Sex Chromosomes in the Control of Male Germ‐Cell Differentiation^a