Core-Strukturen in den meiotischen und post-meiotischen Kernen der Spermatogenese von Gryllus domesticus

Schin, Ki Ssu

doi:10.1007/bf00343172

Cited by 32 publications

(4 citation statements)

References 8 publications

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“…In EM sections they usually provide a different aspect because they are mostly cut transversely, revealing a sandwich-composition of lateral-and central-element-like material. However, if met at a different angle, some of them appear as layers of flat sheets (SCHIN 1965). Accordingly, in spread preparations they would appear as the flat, essentially two-dimensional structures that are described in the present paper.…”

Section: Downloaded By [Case Westernmentioning

confidence: 93%

Elongated Bodies in SC-Spreads of MaleGryllodes Supplicans(Orthoptera)

Loidl

1990

Caryologia

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Section: Downloaded By [Case Westernmentioning

confidence: 93%

Elongated Bodies in SC-Spreads of MaleGryllodes Supplicans(Orthoptera)

Loidl

1990

Caryologia

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“…Weitere K o n t a k tstellen wurden nicht gefunden. (Sotelo und Wettstein, 1964;Schin, 1965;l~oth, 1966;Moens, 1969), enthalten die Spermatocyten yon Panorpa auch in diesem Stadium nieht.…”

Section: D) Dna-bleichung Mit Edta Als Parallelversuch Zum Abbau Derunclassified

Synaptonemal Complex und Chromosomenstruktur in der achiasmatischen Spermatogenese vonPanorpa communis (Mecoptera)

Welsch

1973

Chromosoma

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Abstract. Meiotic prophase in the spermatocytes of Panorpa communis was studied. There is a proper sequence of meiotic stages in the testes. Therefore the temporal development of chromosome structure and the synaptonemal complex (SC) could be studied exactly. The structure and function of the SC are interpreted in a new model.--The chromosomes have a lambrush form from leptotene to diakinesis. At leptotene each chromatid produces an additional axis of basic protein and RNA. The axis becomes one of the lateral elements of the SC. At pachytene the DNA of the bivalents is separated into three regions: 1. Most of the DNA forms long loops outside the SC. 2. Smaller portions of the ])NA filaments are twisted around the lateral elements of the SC. 3. Short DNA loops (called pairing loops) extend into the pairing space. In Panorpa the SC is composed of two lateral elements (chromosome axes), which are connected by equally spaced transverse filaments, a ladder-like central element in the middle of the pairing space and, on each side of the pairing space parallel to the lateral elements, two tCNA containing strands. These are regarded as connected RNA copies of the pairing loops and are responsible for the exact pairing of homologous chromosome segments. At diplotene the axes of the sister chromatids separate to form "double complexes" with four lateral elements. The double complexes of the oocytes contain only transverse filaments between the axes of the homologous chromatids. After a short time they disappear again and the homologues separate to form the chiasmatic bivalents. In the spermatocytes all four chromatid axes are connected by transverse filaments. The pairing complex persists until diakinesis, thereby causing the suppression of the diplotene stage in the light microscope. This may be the only reason for the achiasmatic meiosis in the spermatocytes of Panorpa.(Zusammenfassung see p. 68.) A. EinleitungSeit der Entdeckung des ,,synaptonemal complex" (SC) durch M. J. Moses im Jahre 1956 ist diese Paarungsstruktnr, die zwischen homologen Chromosomen w/~hrend der meiotischen Prophase ausgebildet wird, yon verschiedenen Autoren in fast allen daraufhin untersuchten Organismen gefunden worden (Literatur bei Moses, 1968). 2*

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“…Grouse (1954), also working with Liliura longiflorum, observed chromatid aberrations when irradiation takes place at pachytene, but half-chromatid aberrations when irradiation occurs during diakinesis and metaphase I, Swanson and Young (1965, p. 120) summarized the irradiation experiments of both meiosis and mitosis by stating, "The appearance of half-chromatid aberrations following irradiation in prophase (post-pachytene (1956) and Pawcett (1956) independently discovered in synapsed homologues a tripartite structure which is now referred to as the synaptinemal complex. It has been shown to occur during synapsis of homologues in meiotic prophase of a variety of animals, plants, and fungi (Aldrich, 1967;Carroll and Dykstra, 1966;Ohardard, 1962;Coleman and Moses, 1964;Engles and Groes, 1968;Gassner, 1969;Lu, 1967;Moens, 1968aMoens, , 1968bMoens, , 1969aMoens, , 1969bMoses, i960, 1964;Moses and Coleman, 1964;Febel, I96O;Kebel and Coulon, 1962a;Eoth, 1966;Roth and Ito, 1967;Schin, 1965;Sheridan and Barrnet, 1969;Sotelo and Trujillo-Cenoz, 1958;Sotelo and Wettstein, 1966;Underbrink, et al 1967b;Wolstenholm and Meyer, 1966;and Woo11am and Pord, 1966). Menzel and Price (1966) observed synaptinemal complexes in a tomato-potato hybrid.…”

Section: Proteinmentioning

confidence: 99%

“…The second hypothesis (Comings and Okada, 1969;Menzel and Price, 1966;and Schin, 1965) Is that the synaptinemal complex functions in chromosome pairing (synapsis), hut is not specifically involved in the actual molecular pairing and crossing-over occurring in the bulk of the chromatin surrounding the synaptinemal complex.…”

Section: Proteinmentioning

confidence: 99%

The ultrastructure of meiotic chromosomes of Lilium longiflorum

Braselton

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Core-Strukturen in den meiotischen und post-meiotischen Kernen der Spermatogenese von Gryllus domesticus

Cited by 32 publications

References 8 publications

Elongated Bodies in SC-Spreads of MaleGryllodes Supplicans(Orthoptera)

Elongated Bodies in SC-Spreads of MaleGryllodes Supplicans(Orthoptera)

Synaptonemal Complex und Chromosomenstruktur in der achiasmatischen Spermatogenese vonPanorpa communis (Mecoptera)

The ultrastructure of meiotic chromosomes of Lilium longiflorum

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