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Abstract
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The D-type alfalfa cyclin gene cycMs4 complements G1 cyclin-deficient yeast and is induced in the G1 phase of the cell cycle.

M Dahl, I Meskiene, L Bögre, D T Ha, I Swoboda, R Hubmann, H Hirt, E Heberle-Bors
M Dahl
Institute of Microbiology and Genetics, Vienna Biocenter, Austria.
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I Meskiene
Institute of Microbiology and Genetics, Vienna Biocenter, Austria.
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L Bögre
Institute of Microbiology and Genetics, Vienna Biocenter, Austria.
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D T Ha
Institute of Microbiology and Genetics, Vienna Biocenter, Austria.
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I Swoboda
Institute of Microbiology and Genetics, Vienna Biocenter, Austria.
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R Hubmann
Institute of Microbiology and Genetics, Vienna Biocenter, Austria.
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H Hirt
Institute of Microbiology and Genetics, Vienna Biocenter, Austria.
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E Heberle-Bors
Institute of Microbiology and Genetics, Vienna Biocenter, Austria.
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Published November 1995. DOI: https://doi.org/10.1105/tpc.7.11.1847

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  • Copyright © 1995 by American Society of Plant Biologists

Abstract

Cyclins are key regulators of the cell cycle in all eukaryotes. In alfalfa, we have previously isolated three B-type cyclins. The closely related cycMs1 and cycMs2 genes are expressed primarily during the G2 and M phases and are most likely mitotic cyclins; expression of the cycMs3 gene is induced in the G0-to-G1 transition, when cells reenter the cell cycle. By complementation of G1 cyclin-deficient yeast cells, a novel alfalfa cyclin, designated cycMs4, was isolated. The predicted amino acid sequence of the cycMs4 gene is most similar to that of the Arabidopsis cyclin delta 3 gene. CycMs4 and cyclin delta 3 belong to the class of D-type cyclins and contain PEST-rich regions and a retinoblastoma binding motif. When comparing expression levels in different organs, cycMs4 transcripts were present predominantly in roots. Whereas expression of the cycMs4 gene was cell cycle-regulated in suspension-cultured cells, transcription in roots was observed to depend also on the positional context of the cell. When differentiated G0-arrested leaf cells were induced to resume cell division by treatment with plant hormones, cycMs4 transcription was induced before the onset of DNA synthesis. Whereas this induction was preceded by that of the cycMs3 gene, cycMs2 expression occurred later and at the same time as mitotic activity. These data suggest that cycMs4 plays a role in the G1-to-S transition and provide a model to investigate the plant cell cycle at the molecular level.

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The D-type alfalfa cyclin gene cycMs4 complements G1 cyclin-deficient yeast and is induced in the G1 phase of the cell cycle.
M Dahl, I Meskiene, L Bögre, D T Ha, I Swoboda, R Hubmann, H Hirt, E Heberle-Bors
The Plant Cell Nov 1995, 7 (11) 1847-1857; DOI: 10.1105/tpc.7.11.1847

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The D-type alfalfa cyclin gene cycMs4 complements G1 cyclin-deficient yeast and is induced in the G1 phase of the cell cycle.
M Dahl, I Meskiene, L Bögre, D T Ha, I Swoboda, R Hubmann, H Hirt, E Heberle-Bors
The Plant Cell Nov 1995, 7 (11) 1847-1857; DOI: 10.1105/tpc.7.11.1847
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Vol. 7, Issue 11
Nov 1995
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