Meiotic dynamics in mammalian seminal cells

Worse than nothing at all: the inequality of fusions joining autosomes to the PAR and non-PAR portions of sex chromosomes

Chromosomal fusions play an integral role in genome remodeling and karyotype evolution. Fusions that join a sex chromosome to an autosome are particularly abundant across the tree of life. However, previous models on the establishment of such fusions have not accounted for the physical structure of the chromosomes. We predict a fusion joining an autosome to the pseudoautosomal region (PAR) of a sex chromosome will not remain stable, and the fusion will switch from the X to the Y chromosome each generation due to recombination. We have produced a forward-time population genetic simulation to explore the outcomes of fusions to both the PAR and non-PAR of sex chromosomes. The model can simulate the fusion of an autosome containing a sexually antagonistic locus to either the PAR or non-PAR end of a sex chromosome. Our model is diploid, two-locus, and biallelic. Our results show a clear pattern where fusions to the non-PAR are favored in the presence of sexual antagonism, whereas fusions to the PAR are disfavored in the presence of sexual antagonism.

Centromeric braid disentanglement of mammalian chromatids in 3 dimensions

Disentanglement of centromeric braids is refined in 3 dimensions. Besides expanding the combinatronics of chromatid polarization in comparison to 2-D formats, the present study discusses certain chromosomal anomalies such as the statistics of isochromatids and variants thereof in cancer cells.

Statisticodynamics of pairing between homologous chromatids in mammalian spermatogonia

The paper studies how the Apollonian dynamics of clustered chromatids contributes to optimize pairing between homologs in mitosing mammalian spermatogonia, particularly so during anaphase.