[New class of RNA and centrosomal hypothesis of cell aging].

The recent discovery of a new class of RNA in a centrosome may be an indirect evidence of the centrosomal hypothesis of cellular ageing and differentiation. The presence of a reverse transcriptase domain in this class of RNA, together with its specificity to this organelle, makes the centrosome a place of information memorizing and reproduction. This feature of centrosome is one of the main points of centrosomal hypothesis of cell aging and differentiation.

[Centrosomal hypothesis of cellular aging and differentiation].

The article is dedicated to analysis of centrosomal hypothesis of cellular aging in the light of new data concerning existence of centrosomal RNA, and also in the light of the role of maternal and daughter centrosomes in processes of asymmetric division of stem cells. It is supposed that these data confirm the central role of centrosomes in aging and cellular differentiation. Additional arguments concerning conceptual consistency of telomeric and centrosomal hypothesis of cellular aging are presented.