Modeling meiotic chromosomes indicates a size dependent contribution of telomere clustering and chromosome rigidity to homologue juxtaposition.

PLoS Computational Biology
Christopher A PenfoldAlastair S H Goldman

Abstract

Meiosis is the cell division that halves the genetic component of diploid cells to form gametes or spores. To achieve this, meiotic cells undergo a radical spatial reorganisation of chromosomes. This reorganisation is a prerequisite for the pairing of parental homologous chromosomes and the reductional division, which halves the number of chromosomes in daughter cells. Of particular note is the change from a centromere clustered layout (Rabl configuration) to a telomere clustered conformation (bouquet stage). The contribution of the bouquet structure to homologous chromosome pairing is uncertain. We have developed a new in silico model to represent the chromosomes of Saccharomyces cerevisiae in space, based on a worm-like chain model constrained by attachment to the nuclear envelope and clustering forces. We have asked how these constraints could influence chromosome layout, with particular regard to the juxtaposition of homologous chromosomes and potential nonallelic, ectopic, interactions. The data support the view that the bouquet may be sufficient to bring short chromosomes together, but the contribution to long chromosomes is less. We also find that persistence length is critical to how much influence the bouquet structure...Continue Reading

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Citations

Oct 2, 2014·Scientific Reports·María del Carmen CalderónPilar Prieto
Mar 25, 2014·Journal of Genetics and Genomics = Yi Chuan Xue Bao·Jing ZhangFangpu Han
Dec 14, 2012·PLoS Computational Biology·David M RichardsMartin Howard
Jul 30, 2017·Science China. Life Sciences·Jing Zhang, Fangpu Han

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