Cytological evidence for procentric synapsis of meiotic chromosomes in female Drosophila melanogaster. The behaviour of an extra Y chromosome

Dåvring, Lars; Sunner, Margareta

doi:10.1111/j.1601-5223.1979.tb01641.x

Cited by 9 publications

(2 citation statements)

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“…Early in stage S, the chromosomes were recondensing ( Fig. 3d) and the ensuing meiotic events appeared as have been described previously (for references, see DAVRING and SUNNER 1979;PURO and NOKKALA 1977). So far, it has been shown that the oocyte chromosomes thus expand much earlier than was stated by MAHOWALD and KAMBY-SELLlS (1980), who had not studied the morphology of the oocyte chromosomes themselves in detail; we have also shown that the meiotic chromosomes are in a recondensing phase from egg chamber stage S,.…”

Section: Drosophila Melanogaslevsupporting

confidence: 73%

“…somes, these regions in the genome do not join in the common chromocenter of the oocyte (NOR of the X's was a reliable landmark, see also Fig. 3a) (DAVRING and SUNNER 1979). The chromocenter was built up of cohesive elements from centromeric heterochromatin, which was well documented, especially with respect to early nurse cell momere structures in the isopycnotic heterochromatic portions were also evident in the pachytene chromosomes (Fig.…”

Section: Drosophila Melanogaslevmentioning

confidence: 95%

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A lampbrush phase in oocytes of Drosophila and its bearing upon mutagen sensitivity data

Dåvring

Sunner

2008

Hereditas

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An autoradiographic study of RNA synthesis on S, oocyte chromosomes of D. melanogasler was performed together with a renewed light microscopic investigation of this stage. Corresponding oocyte stages inD. hydei and D.funebris were also studied. It is evident that the meiotic chromosomes of these species pass through a lampbrush phase at the end of pachytene. Transcriptions on both hetero‐ and euchromatin in the genome were confirmed during the lampbrush phase in D. melanogasler. The lampbrush phase seems to parallel a decreased mutation sensitivity known to occur during this stage of oocyte development. Oocytes of the more mutation sensitive D. melanogasler mutant c(3)G also pass through a lampbrush phase.

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Section: Drosophila Melanogaslevsupporting

confidence: 73%

Section: Drosophila Melanogaslevmentioning

confidence: 95%

A lampbrush phase in oocytes of Drosophila and its bearing upon mutagen sensitivity data

Dåvring

Sunner

2008

Hereditas

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Differential mechanisms governing segregation of a univalent in oocytes and spermatocytes of Drosophila melanogaster

Puro

1991

Chromosoma

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In tricomplex heterozygotes in Drosophila melanogaster three metacentric autosomes (the TRI chromosomes) appear as a trivalent in meiosis while one autosome consisting of two homologous arms attached to the same centromere (a compound) behaves as an obligatory univalent. Cytological analysis of meiosis of tri-complex heterozygotes indicates that in oocytes the univalent compound behaves non-independently in relation to segregation of the trivalent. The compound is distributed preferentially to the same pole as one TRI chromosome. In spermatocytes the compound is distributed at random. In some oocytes the directed segregation is shown to be due to a disjunctional interaction between the compound and one partner of the trivalent at the same time as the other two chromosomes of the trivalent are separating from each other. The basic difference between the segregational mechanisms in the two sexes is discussed with a review of evidence indicating that in males segregation is determined by physical linkage that produces a stable orientation of the homologues at metaphase I. On the other hand, both genetic and cytological evidence indicate that in females a physical linkage (a chiasma) is non-essential for maintenance of co-orientation and stability after the onset of prometaphase. Genetic and cytological evidence support the hypothesis that disjunction is predetermined by non-random arrangement of the centromeric regions of chromosomes in the chromocentre - a suprachromosomal organization characteristic of maturing oocytes.

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Polytene Chromosomes, Heterochromatin, and Position Effect Variegation

Жимулев

1997

Advances in Genetics

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Cytological evidence for procentric synapsis of meiotic chromosomes in female Drosophila melanogaster. The behaviour of an extra Y chromosome

Cited by 9 publications

References 9 publications

A lampbrush phase in oocytes of Drosophila and its bearing upon mutagen sensitivity data

A lampbrush phase in oocytes of Drosophila and its bearing upon mutagen sensitivity data

Differential mechanisms governing segregation of a univalent in oocytes and spermatocytes of Drosophila melanogaster

Polytene Chromosomes, Heterochromatin, and Position Effect Variegation

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