When haploid cells of mating type a and α meet, they extend a projection toward the other ("shmoo"), stop their cell cycle, start transcription of mating genes, and finally fuse to form a diploid cell.
In general, there are five transitions during the eukaryotic cell cycle: Start (Restriction Point), G1/S, G2/M, meta/anaphase transitions and mitotic exit.
Senescent cells exit the cell cycle, start secreting specific proteins that affect the microenvironment and display a number of senescence-associated markers, e.g., induction of cell cycle inhibitory proteins, senescence associated β-galactosidase (SA β-gal) and senescence associated heterochromatic foci (SAHF) formation.
Meeks and Elhai [1] proposed a two-stage model of pattern formation in which four contiguous (synchronous) cells at similar favorable stages in their cell cycles start to differentiate after nitrogen step-down and then undergo competitive resolution to select a single heterocyst.
Robustness was interpreted as involving stability of G1 steady state and sequence of gene expression from cell cycle START to stationary G1.
CCND3 is expressed in nearly all proliferating cells and could promote the cell cycle start (44).
There are six phases in a cell cycle: START, G1, S, G2, M and stationary G1 phase.
The aim of our project is to give an exhaustive view of the cell cycle process starting from its building-blocks, genes and proteins, arriving to the pathway they create, represented by the models.
This effect was dose dependent and stronger using zoledronate, which induced significant alterations of the cell cycle progression starting at the concentration of 30 μ; in comparison, pamidronate had a significant effect on cell cycle progression only at the concentration of 100 μ.
Polo-like kinases play critical roles during multiple stages of cell cycle progression, starting from control of the G2/M transition through phosphorylation of CDC25C and mitotic cyclins and a role in the DNA damage checkpoint adaptation to prevent entry into mitosis [ 42].
