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. 1993 Oct;4(10):1003–1015. doi: 10.1091/mbc.4.10.1003

Fission yeast genes nda1+ and nda4+, mutations of which lead to S-phase block, chromatin alteration and Ca2+ suppression, are members of the CDC46/MCM2 family.

S Miyake 1, N Okishio 1, I Samejima 1, Y Hiraoka 1, T Toda 1, I Saitoh 1, M Yanagida 1
PMCID: PMC275734  PMID: 8298187

Abstract

Fission yeast cold-sensitive mutants nda1-376 and nda4-108 display a cell cycle block phenotype at the restrictive temperature (cell elongation with the single nucleus) accompanied by an alteration in the nuclear chromatin region. DNA content analysis shows that the onset of DNA synthesis is blocked or greatly delayed in both mutant cells, the block being reversible in nda4-108. Upon release to the permissive temperature, nda4-108 cells resumed replicating DNA, followed by mitosis and cytokinesis. The nda4 phenotype was partly rescued by the addition of Ca2+ to the medium; Ca2+ plays a positive role in the nda4+ function. The predicted protein sequences of nda1+ and nda4+ isolated by complementation are similar to each other and also, respectively, to those of the budding yeast, MCM2 and CDC46, both of which are members of the gene family required for the initiation of DNA replication. The central domains of these proteins are conserved, whereas the NH2- and COOH- domains are distinct. Results of the disruption of the nda1+ and nda4+ genes demonstrates that they are essential for viability.

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Selected References

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