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First published online 13 February 2007
doi: 10.1242/jcs.003186

Journal of Cell Science 120, 731-736 (2007)
Published by The Company of Biologists 2007
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Short Report

Meiotic interference among MLH1 foci requires neither an intact axial element structure nor full synapsis

Esther de Boer1, Axel J. J. Dietrich2, Christer Höög3, Piet Stam4 and Christa Heyting1,*

1 Wageningen University, Molecular Genetics group, Arboretumlaan 4, 6703 BD Wageningen, The Netherlands
2 Institute of Human Genetics, University of Amsterdam, AMC, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands
3 Department of Cell and Molecular Biology, Karolinska Institute, SE-171 77 Stockholm, Sweden
4 Wageningen University, Laboratory of Plant Breeding, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands

* Author for correspondence (e-mail: Christa.Heyting{at}wur.nl)

Accepted 4 January 2007

Summary

During meiosis, homologous chromosomes (homologs) perform reciprocal exchanges (crossovers) at a high frequency. Crossovers display interference, i.e. their spacing is more even than would be expected if they were placed randomly along the chromosomes. Concomitantly with crossover formation, synaptonemal complexes (SCs) appear between homologs: each chromosome forms an axial structure, the axial element (AE); the AEs of homologs align, and numerous transverse filaments connect the AEs to form an SC. Both the AE and the SC have been implicated in the imposition of interference. We investigated whether intact AEs or SCs are required for crossover interference in the mouse, using a mutant lacking AE protein SYCP3, which displays structurally abnormal AEs and incomplete synapsis. We estimated the level of interference from the spacing of immunofluorescent MLH1 foci, which mark almost all crossover sites in the mouse, along the SCs. The levels of interference among MLH1 foci in wild-type and Sycp3–/– mice were comparable, implying that neither an intact AE structure nor full synapsis is required for wild-type levels of interference.

Key words: Meiosis, Synapsis, Axial elements, Interference, MLH1, Mouse




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