The CHL 1 (CTF 1) Gene Product of Saccharomyces Cerevisiae is Important for Chromosome Transmission and Normal Cell Cycle Progression in G2/M
Overview
Molecular Biology
Authors
Affiliations
We have analyzed the CTF1 gene, identified in a screen for mutants with decreased chromosome transmission fidelity and shown to correspond to the previously identified chl1 mutation. Chl1 null mutants exhibited a 200-fold increase in the rate of chromosome III missegregation per cell division, and near wild-type rates of marker homozygosis on this chromosome by mitotic recombination. Analysis of the segregation of a marker chromosome indicated that sister chromatid loss (1:0 segregation) and sister chromatid non-disjunction (2:0 segregation) contributed equally to chromosome missegregation. A genomic clone of CHL1 was isolated and used to map its physical position on chromosome XVI. Nucleotide sequence analysis of CHL1 revealed a 2.6 kb open reading frame with a 99 kd predicted protein sequence that contained two PEST sequences and was 23% identical to the coding region of a nucleotide excision repair gene, RAD3. Domains of homology between these two predicted protein sequences included a helix-turn-helix motif and an ATP binding site containing a helicase consensus. Mutants lacking the CHL1 gene product are viable and display two striking, and perhaps interrelated, phenotypes: extreme chromosome instability and a delay in cell cycle progression in G2/M. This delay is independent of the cell cycle checkpoint that requires the function of the RAD9 gene.
Mapping of DDX11 genetic interactions defines sister chromatid cohesion as the major dependency.
Amitzi L, Cozma E, Tong A, Chan K, Ross C, ONeil N G3 (Bethesda). 2024; 14(5).
PMID: 38478595 PMC: 11075568. DOI: 10.1093/g3journal/jkae052.
Cao K, Wang R, Li L, Liao Y, Hu X, Li R Oncogene. 2023; 43(1):35-46.
PMID: 38007537 DOI: 10.1038/s41388-023-02898-x.
He D, Du Z, Xu H, Bao X Int J Mol Sci. 2022; 23(12).
PMID: 35743069 PMC: 9224301. DOI: 10.3390/ijms23126631.
The Genome Stability Maintenance DNA Helicase DDX11 and Its Role in Cancer.
Mahtab M, Boavida A, Santos D, Pisani F Genes (Basel). 2021; 12(3).
PMID: 33802088 PMC: 8000936. DOI: 10.3390/genes12030395.
Hamza A, Amitzi L, Ma L, Driessen M, ONeil N, Hieter P Proc Natl Acad Sci U S A. 2021; 118(14).
PMID: 33782138 PMC: 8040598. DOI: 10.1073/pnas.2100240118.