Journal ArticleDOI
Synaptonemal complex spreading in Allium cepa and Allium fistulosum. II. Pachytene observations: the SC karyotype and the correspondence of late recombination nodules and chiasmata
S. M. Albini,G. H. Jones +1 more
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TLDR
The positional distribution of late recombination nodules along synaptonemal complexes corresponds almost exactly to the distribution of chiasmata along metaphase I bivalents in the two species.Abstract:
Pachytene synaptonemal complexes and recombination nodules were analysed, by surface spreading, in the closely related species Allium fistulosum and Allium cepa (both 2n = 16), which show highly co...read more
Citations
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Journal ArticleDOI
Meiotic chromosomes: integrating structure and function.
Denise Zickler,Nancy Kleckner +1 more
TL;DR: The current article reviews recent information on diverse aspects of chromosome morphogenesis, notably relationships between sisters, development of axial structure, and variations in chromatin status in an historical context.
Journal ArticleDOI
The genetics and molecular biology of the synaptonemal complex.
Scott L. Page,R. Scott Hawley +1 more
TL;DR: The demonstration that the sites of crossover formation are designated prior to SC formation, and the finding that these sites display interference, argues against a role of the mature SC in mediating the process of interference.
Journal ArticleDOI
The leptotene-zygotene transition of meiosis
Denise Zickler,Nancy Kleckner +1 more
TL;DR: The leptotene/zygotene transition of meiosis, as defined by classical cytological studies, is the period when homologous chromosomes begin to be close together or touching over portions of their lengths, and includes the bouquet stage.
Journal ArticleDOI
Synaptonemal complex proteins: occurrence, epitope mapping and chromosome disjunction.
TL;DR: The use of polyclonal antibodies against fusion proteins produced from cDNA fragments of a meiotic chromosome core protein, Cor1, and a protein present only in the synapsed portions of the cores, Syn1, to detect the occurrence and the locations of these proteins in rodent meiotic prophase chromosomes suggests that direct interactions might be expected between some of the Syn1 fusion proteins.
Journal ArticleDOI
The time course and chromosomal localization of recombination-related proteins at meiosis in the mouse are compatible with models that can resolve the early DNA-DNA interactions without reciprocal recombination.
Peter B. Moens,Nadine K. Kolas,Madalena Tarsounas,Edyta Marcon,Paula E. Cohen,Barbara Spyropoulos +5 more
TL;DR: The possibility that the homology-search RAD51/DMC1 complexes are involved in homologous chromosome synapsis but that most of these early DNA-DNA interactions are later resolved by the anti-recombination RPA/MSH4/BLM-topoisomerase complex, thereby preventing the formation of superfluous reciprocal recombinant events is considered.
References
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Journal ArticleDOI
The synaptonemal complex in genetic segregation.
TL;DR: The synaptonemal complex provides both the structural basis for the regular disjunction of chromosomes at meiosis and gene recombination between homologous or homoeologous chromosome arms.
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Development of the synaptonemal complex and the "recombination nodules" during meiotic prophase in the seven bivalents of the fungus Sordaria macrospora Auersw.
TL;DR: Complete reconstruction of seven leptotene, six zygotene, three pachytene and three diplotene nuclei has permitted to follow the pairing process in the Ascomycete Sordaria macrospora, providing additional insight into meiotic processes such as chromosome movements, initiation and development of the pairing sites during zyGotene, the existence of “fixed” telomeres, the variations in SC length.
Journal ArticleDOI
Synaptonemal complex spreading in Allium cepa and A. fistulosum. I: The initiation and sequence of pairing
S. M. Albini,Gareth H. Jones +1 more
TL;DR: The general features and fine structure of homologous chromosome alignment and pairing have been investigated in two species of Allium, which have similar karyotypes but very different patterns of chiasma distribution, and it is argued that they may be evenly distributed through most of the genome.
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Nuclear DNA variation in Allium
TL;DR: It is revealed that widespread changes in nuclear DNA content accompanied the divergence and evolution of species within the genus Allium and provides information about the nature and the distribution of the chromosome structural changes which account for the variation innuclear DNA.
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The duration of meiosis in pollen mother cells of wheat, rye and Triticale
TL;DR: The duration of meiosis and its stages at 20 °C has been determined in wheat, in rye and in Triticale by sampling methods and by timing the intervals between the pre-meiotic DNA synthesis and meiotic stages following the incorporation of tritiated thymidine.