Species-specific reorganization of the interphase chromosome architecture in generative tissue as a special type of chromosomal mutations associated with speciation

Resumo

Epigenetic mechanisms of speciation are considered, including heterochromatic modifications and changes in spatial chromosome organization in the generative cell systems. The value of lamina, topoisomerase II, and a DNA polypurine tract in the attachment of chromosomes to the nuclear envelope is discussed. It is postulated that the main event leading to species-specific fixation of gene mutations, chromosomal mutations, and heterochromatin modifications in speciation is the rearrangement of spatial chromosome organization in the nucleus. The change in interchromosomal relationships associated with the reorganization of the system of chromosomal contacts with the nuclear envelope and the rearrangement of the chromocenter apparatus of the interphase nucleus is estimated as a systemic mutation directly related to speciation.