Synaptonemal Complex and Male Crossing-over in &lt;i&gt;Drosophila ananassae&lt;/i&gt;

Moriwaki, Daigoro; Tsujita, Mitsuo

doi:10.1508/cytologia.39.829

Cited by 9 publications

(3 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In fact, at the early stages of formation of the complex, it may be easier than after its completion to imagine pairing between homologues at the DNA base level (in order to account for probable traversal of the complex by cross strands at chiasmata). Observations of short or abortive synaptonemal complex-like elements in heterozygotes for a meiotic m utant (Smith & King 1968) and in the male of Drosophila ananassae (Moriwaki & Tsujita 1974) seem to be consistent with such a view. These represent cases where substantial (although less than normal map) crossover frequency has been reported.…”

Section: Comparisons Offrequencies O F Pachytene Synapsis and Crossing Over In Materials Heterozygous For Rearranged Chromosome Segmentsmentioning

confidence: 56%

Homologous chromosome pairing

Maguire

1977

Phil. Trans. R. Soc. Lond. B

View full text Add to dashboard Cite

Commonly accepted precepts are challenged: (1) that homologous chromosome pairing is normally mediated by nuclear envelope attachment sites; (2) that crossover site establishment awaits synaptic completion; and (3) that it is the function of the synaptonemal complex to hold homologues in register so that equal crossing over can occur, and perhaps to provide machinery for the crossover process. Although these views may eventually be shown to be true, it is felt that currently available evidence does not warrant their full acceptance, and that alternatives should be considered. As examples of alternatives the following ideas, with some supporting evidence, are suggested: (1) homologous chromosome pairing (in non-haplont organisms) may be accomplished by chance meeting of homologue segments (followed by establishment of invisible, elastic connectors) at congression for a mitotic metaphase (in many cases perhaps the premeiotic mitosis); (2) crossover sites may be established before, during, or immediately following initiation of synapsis; and (3) the synaptonemal complex may somehow function in the crossover process at the inception of its formation, but its complete deployment throughout each normal bivalent may serve some other role, such as mediation of the binding of sister chromatids apparently required for chiasma maintenance until anaphase I.

show abstract

Section: Comparisons Offrequencies O F Pachytene Synapsis and Crossing Over In Materials Heterozygous For Rearranged Chromosome Segmentsmentioning

confidence: 56%

Homologous chromosome pairing

Maguire

1977

Phil. Trans. R. Soc. Lond. B

View full text Add to dashboard Cite

show abstract

“…W h e n crossing-over w a s reported t o o c c u r in Drosophila ananassae males in the absence of the SC (Grell et al 1972), some semblance of short S C segments was soon found there (Moriwaki and Tsujita 1974). Interestingly, attention has recently been directed at D. rnelanogaster meiotic mutants in which precocious sister centromere separation occurs in males (Kerrebrock et al 1992).…”

Section: Discussionmentioning

confidence: 99%

Evidence from a maize desynaptic mutant points to a probable role of synaptonemal complex central region components in provision for subsequent chiasma maintenance

Maguire¹,

Riess²,

Paredes³

1993

Genome

View full text Add to dashboard Cite

Homozygotes for the dsy1 desynaptic mutant of maize show massive failure of chiasma maintenance during diplotene and diakinesis. Although some chiasmata persist until anaphase I in most microsporocytes expressing this mutant, homozygotes are completely or nearly completely sterile, owing apparently to disjunctive irregularities. Pachytene synaptic errors and some synaptic failure also are found, but recombination nodules are common in homologously synapsed regions, and equational separation of a heterozygous knob into univalents or open arms at diakinesis clearly demonstrates that chiasma failure occurs following crossing-over. A wider than normal synaptonemal complex central region and uniform apparent weakness of central region cross connections to spreading procedures strongly suggest the presence of a genetic lesion in a synaptonemal complex central region component. The dsy1 mutant may provide an especially important source of material for molecular studies on the nature of chiasma maintenance mechanism.

show abstract

“…No marked differences in chromosome pairing process at the stage of synapsis have been observed between male and female Bornbyx germ-cells that can account for the difference in the spontaneous recombination rate between the sexes (Maeda, 1939;Murakami and Imai, 1974 In the male maintid, which has an achiasmatic meiosis, Gassner (1969) observed that the synaptinemal complex is retained in spermatocytes from pachytene to metaphase I. Recently, Moriwaki and Tsujita (1974) reported, however, that in Drosophila ananassae synaptinemal complex may be detected in spermatocytes. Recently, Moriwaki and Tsujita (1974) reported, however, that in Drosophila ananassae synaptinemal complex may be detected in spermatocytes.…”

Section: Resultsmentioning

confidence: 99%

X-ray-induced recombination during oogenesis in the silkworm (Bombyx mori L.)

Murakami

1976

Radiat Environ Biophys

View full text Add to dashboard Cite

The physical induction of recombinational events has been studied in the female silkworm (Bombyx mori), in which crossing-over does not normally occur. Female silkworms heterozygous in the trans type of two egg-color genes, pe (V-0.0) and re (V-31.7), received a single dose of X-rays (1000 R) at various developmental stages. Then they were crossed to marked males homozygous for both genes. The results indicated that X-rays increase the occurrence of recombinational events in silkworm females from first instar larvae to late stage pupae. The spontaneous frequency of exchange type recombinants in the control series was 2.5 X 10(-5), while after irradiation the frequency of these recombinants was up to 38.8 X 10(-5). The sensitive stage to X-ray-induced recombinational events was late stage larvae from fourth to fifth instar. Exchange (cross-over) type recombinants were about three times more frequent than interchange types among the 122 recombinants recovered. The biological significance of the present finding is discussed.

show abstract

Synaptonemal Complex and Male Crossing-over in <i>Drosophila ananassae</i>

Cited by 9 publications

References 21 publications

Homologous chromosome pairing

Homologous chromosome pairing

Evidence from a maize desynaptic mutant points to a probable role of synaptonemal complex central region components in provision for subsequent chiasma maintenance

X-ray-induced recombination during oogenesis in the silkworm (Bombyx mori L.)

Contact Info

Product

Resources

About