Cohesin Smc1beta determines meiotic chromatin axis loop organization

The Journal of Cell Biology
Ivana NovakC Höög

Abstract

Meiotic chromosomes consist of proteinaceous axial structures from which chromatin loops emerge. Although we know that loop density along the meiotic chromosome axis is conserved in organisms with different genome sizes, the basis for the regular spacing of chromatin loops and their organization is largely unknown. We use two mouse model systems in which the postreplicative meiotic chromosome axes in the mutant oocytes are either longer or shorter than in wild-type oocytes. We observe a strict correlation between chromosome axis extension and a general and reciprocal shortening of chromatin loop size. However, in oocytes with a shorter chromosome axis, only a subset of the chromatin loops is extended. We find that the changes in chromatin loop size observed in oocytes with shorter or longer chromosome axes depend on the structural maintenance of chromosomes 1beta (Smc1beta), a mammalian chromosome-associated meiosis-specific cohesin. Our results suggest that in addition to its role in sister chromatid cohesion, Smc1beta determines meiotic chromatin loop organization.

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Citations

Nov 19, 2010·Chromosome Research : an International Journal on the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology·Amit Bardhan
Jan 15, 2011·Chromosome Research : an International Journal on the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology·Huanyu QiaoLorinda K Anderson
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Methods Mentioned

BETA
PCR
biopsies

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Openlab
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SoftWorx
Improvision
Photoshop CS2
SPSS

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