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. 1991 Feb;95(2):406–411. doi: 10.1104/pp.95.2.406

Isolation of Genes that Are Preferentially Expressed at the G1/S Boundary during the Cell Cycle in Synchronized Cultures of Catharanthus roseus Cells 1

Hiroaki Kodama 1,2, Masaki Ito 1,2, Tsukaho Hattori 1,2, Kenzo Nakamura 1,2, Atsushi Komamine 1,2
PMCID: PMC1077545  PMID: 16667998

Abstract

A cDNA library was screened for genes that may be involved in the progression of the cell cycle of cells of higher plants. The Catharanthus roseus L. (G) Don. cells were synchronized by the double phosphate starvation method, and a λgt11 cDNA library was prepared using poly(A)+ RNA from cells in the S phase of the cell cycle. Two independent sequences, cyc02 and cyc07, were identified by differential screening. The levels of cyc02 and cyc07 mRNAs increased dramatically, but transiently, at the G1/S boundary of the cell cycle. High levels of cyc02 mRNA, but not of cyc07 mRNA, were also present in cells arrested at the G1 phase by phosphate starvation. In an asynchronous batch culture, cyc02 and cyc07 mRNAs accumulated transiently at different stages of the growth cycle, cyc02 mRNA early in the stationary phase, and cyc07 mRNA in the midlogarithmic phase. When the proliferation of cells was arrested by nutrient starvation, i.e. by sucrose or nitrogen starvation, the relative amounts of the cyc02 and cyc07 mRNAs decreased. These results indicate that cyc02 and cyc07 contain nucleotide sequences from growth-related genes. The analysis of nucleotide sequence of cyc02 shows that the predicted product of this gene is basic and is composed of 101 amino acids. No significant homology to other known proteins was detected.

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Selected References

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