Main content area

Spatial organization of fibroblast and spermatocyte nuclei with different B-chromosome content in Korean field mouse, Apodemus peninsulae (Rodentia, Muridae)

Karamysheva, Tatyana V., Torgasheva, Anna A., Yefremov, Yaroslav R., Bogomolov, Anton G., Liehr, Thomas, Borodin, Pavel M., Rubtsov, Nikolay B.
Genome 2017 v.60 no.10 pp. 815-824
Apodemus, B chromosomes, centromeres, fibroblasts, fluorescence in situ hybridization, heterochromatin, interphase, mice, microscopy, models
Korean field mouse (Apodemus peninsulae) shows a wide variation in the number of B chromosomes composed of constitutive heterochromatin. For this reason, it provides a good model to study the influence of the number of centromeres and amount of heterochromatin on spatial organization of interphase nuclei. We analyzed the three-dimensional organization of fibroblast and spermatocyte nuclei of the field mice carrying a different number of B chromosomes using laser scanning microscopy and 3D fluorescence in situ hybridization. We detected a co-localization of the B chromosomes with constitutive heterochromatin of the chromosomes of the basic set. We showed a non-random distribution of B chromosomes in the spermatocyte nuclei. Unpaired B chromosomes showed a tendency to occur in the compartment formed by the unpaired part of the XY bivalent.