Influence of cell cycle on the imprinting

(Csaba, G., Németh, G., Vargha, P.: Influence of hormone treatment applied or begun in different phases of the cell cycle on hormonal imprinting in Tetrahymena. Acta Biol. Hung. 36, 141-145, 1985)

Mean growth rates of Tetrahymena pre-exposed to T₂ in different phases of cell cycle

Beginning of imprinting	Duration of imprinting	Mean
G1	4 h	19.1
After 100 min (S)	4 h	16.0
G1	15’	20.6
After 100 min (S)	15’	16.4
After 140 min (G2)	15’	15.0
Without treatment at all		13.2
Without pretreatment		14.2

Significances: p<0.01 to control (without treatment at all); p<0.01 between G₁ and S and between G₁ and G₂. T₂=diiodotyrosine

Conclusions:

1.The intensity of hormonal imprinting depends on the phase of cell cycle,

2.The effect of imprinting is greater in the case of G₁ than in S or G₂.