Oogenesis in the golden hamster (&lt;i&gt;Mesocricetus auratus&lt;/i&gt;)

Lemon, J.G.; Morton, William R.

doi:10.1159/000129999

Cited by 10 publications

(1 citation statement)

References 2 publications

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“…The progression of the different stages of meiosis observed by us in the mouse is in agreement with that observed by Borum (1961) and Speed (1982). No data have been published so far on hamster SCs; the data based on chromosome studies are not in agreement with our results (Lemon & Morton, 1968;Challoner, 1974;Arrau et al, 1981).…”

Section: Discussioncontrasting

confidence: 88%

Sequential study of the synaptonemal complex in Syrian hamster (Mesocricetus auratus) and mouse (Mus musculus) oocytes by light and electron microscopy

Freixa¹,

Garcı́a

Ponsà

et al. 1985

Genetica

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We describe the behaviour of synaptonemal complexes (SCs) in Syrian hamster and mouse oocytes. In Mesocricetus auratus, synaptonemal complexes can be observed from birth up to 7 days of life. In foetuses from Mus nTusculus, synaptonemal complexes can be observed from the 14th day of gestation up to the first day post-partum, when the cells enter the dictyotene stage. In both species, synaptonemal complexes show, in general, the same morphology described in male cells by light and electron microscopy, with the exception that the axes of the sex bivalent are not identifiable. The leptotene stage can be identified although it is probably of short duration. Only one type of zygotene (zygotene II of Dietrich and Mulder (Chromosoma 88: 377), 1983) has been observed. In the hamster we also describe a desynaptic diplotene stage previous to the desintegration of the SCs. In oocytes from both species late pairing (or precocious separation) of a single bivalent can be seen in a few cells. Interlocking of some bivalents with delayed pairing of the affected region is rather frequent. Furthermore, hamster oocytes may show heterosynapsis of the telomeres of autosomal bivalents by pachytene.

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Section: Discussioncontrasting

confidence: 88%

Sequential study of the synaptonemal complex in Syrian hamster (Mesocricetus auratus) and mouse (Mus musculus) oocytes by light and electron microscopy

Freixa¹,

Garcı́a

Ponsà

et al. 1985

Genetica

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Cytology and Timing of Meiotic Stages in Female Germ Cells of Mammals and Man

Kuhlmann¹

1970

Chemical Mutagenesis in Mammals and Man

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A light- and electron microscopic analysis of meiotic prophase in female mice

Dietrich

Mulder

1983

Chromosoma

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In the paper we describe meiotic prophase of female mice on successive days of embryonic and early postnatal development. For this purpose we used three different techniques on ovarian material, i.e., Giemsa staining for the light microscopic study of chromatin, silver staining for the light microscopic study of the synaptonemal complex (SC), and agar filtration followed by uranyl acetate staining for the electron microscopic study of the SC. In all types of preparation it was impossible to distinguish leptotene stages, and we conclude that if leptotene really exists, it is of very short duration.--Two types of zygotene stages were found: the "normal" one, resembling zygotene stages in male mice, and a second type that has never been described in males and is characterized by, probably stable, unpaired regions together with totally unpaired axial elements of the SC.--The duration of pachytene was found to be 3-4 days, which is considerably shorter than in males. During early diplotene despiralization of the chromatin and disintegration of the axes of the SC were usually found together with desynapsis.--A considerable variation in distribution of meiotic stages was found between different litters in the same day of gestation. Fetuses in the same litter showed no significant variation. However, the oocytes in an ovary did not pass through meiosis synchronously, with differences up several days. The appearance of chromosomes in a highly contracted state could not be interpreted as a preleptotene condensation stage but probably is a mitotic phenomenon.

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Oogenesis in the golden hamster (<i>Mesocricetus auratus</i>)

Cited by 10 publications

References 2 publications

Sequential study of the synaptonemal complex in Syrian hamster (Mesocricetus auratus) and mouse (Mus musculus) oocytes by light and electron microscopy

Sequential study of the synaptonemal complex in Syrian hamster (Mesocricetus auratus) and mouse (Mus musculus) oocytes by light and electron microscopy

Cytology and Timing of Meiotic Stages in Female Germ Cells of Mammals and Man

A light- and electron microscopic analysis of meiotic prophase in female mice

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