Abstract
Meiotic recombination proceeds in biochemical complexes that are physically associated with underlying chromosome structural axes. In this study, we discuss the organizational basis for these axes, the timing and nature of recombinosome/axis organization with respect to the prophase program of DNA and to structural changes, and the possible significance of axis organization. Furthermore, we discuss implications and extensions of our recently proposed mechanical model for chiasma formation. Finally, we give a broader consideration to past and present models for the role of the synaptonemal complex.
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Notes
It has been proposed that the relationship of DNA events to cytological stages might be different in Drosophila from that described above as the general case. Specifically, it has been suggested that DSBs occur after SC formation (McKim et al. 2002). The primary direct evidence for this view is that gamma-H2AX foci, which mark the sites of both mitotic and meiotic DSBs, can be observed only at pachytene. However, this finding would imply only that SCs form very rapidly after DSB formation, e.g., with little or no “bridge stage.” Alternatively, gamma-H2AX foci have recently been reported also to occur during the pachytene stage in grasshopper (Viera et al. 2004) as a second wave, separate from the late leptotene wave. This raises the additional possibility that, for some reason, only the later foci are detected in Drosophila, thus leading to mistiming of DSB formation.
Abbreviations
- L:
-
leptotene
- Z:
-
zygotene
- P:
-
pachytene
- EP:
-
early pachytene
- MP:
-
middle pachytene
- LP:
-
late pachytene
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Acknowledgements
This work was supported by National Institutes of Health (USA) grants GM25326 and GM44794. The author is grateful for ideas and comments from Denise Zickler, Gareth H. Jones and members of the Kleckner lab, and for manuscript help from Jim Henle.
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Communicated by R. Benavente
The synaptonemal complex—50 years
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Kleckner, N. Chiasma formation: chromatin/axis interplay and the role(s) of the synaptonemal complex. Chromosoma 115, 175–194 (2006). https://doi.org/10.1007/s00412-006-0055-7
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DOI: https://doi.org/10.1007/s00412-006-0055-7