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The fission yeast F...
The fission yeast FHIT homolog affects checkpoint control of proliferation and is regulated by mitochondrial electron transport.
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- Johansson Sjölander, Johanna, 1980 (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology
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- Sunnerhagen, Per, 1959 (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology
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(creator_code:org_t)
- 2019-10-02
- 2020
- Engelska.
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Ingår i: Cell Biology International. - : Wiley. - 1095-8355 .- 1065-6995. ; 44:2, s. 412-423
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Abstract
Ämnesord
Stäng
- Genetic analysis has strongly implicated human FHIT (Fragile Histidine Triad) as a tumor suppressor gene, being mutated in a large proportion of early-stage cancers. The functions of the FHIT protein have, however, remained elusive. Here, we investigated aph1+ , the fission yeast homolog of FHIT, for functions related to checkpoint control and oxidative metabolism. In sublethal concentrations of DNA damaging agents, aph1Δ mutants grew with a substantially shorter lag phase. In aph1Δ mutants carrying a hypomorphic allele of cds1 (the fission yeast homolog of Chk2), in addition, increased chromosome fragmentation and missegregation were found. We also found that under hypoxia or impaired electron transport function, the Aph1 protein level was strongly depressed. Previously, FHIT has been linked to regulation of the human 9-1-1 checkpoint complex constituted by Hus1, Rad1, and Rad9. In Schizosaccharomyces pombe, the levels of all three 9-1-1 proteins are all downregulated by hypoxia in similarity with Aph1. Moreover, deletion of the aph1+ gene reduced the Rad1 protein level, indicating a direct relationship between these two proteins. We conclude that the fission yeast FHIT homolog has a role in modulating DNA damage checkpoint function, possibly through an effect on the 9-1-1 complex, and that this effect may be critical under conditions of limiting oxidative metabolism and reoxygenation.
Ämnesord
- NATURVETENSKAP -- Biologi -- Biokemi och molekylärbiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Biochemistry and Molecular Biology (hsv//eng)
Nyckelord
- Acid Anhydride Hydrolases
- genetics
- metabolism
- Cell Cycle
- Cell Cycle Proteins
- genetics
- metabolism
- Cell Proliferation
- DNA Damage
- Electron Transport
- Endopeptidases
- genetics
- metabolism
- Mitochondria
- metabolism
- Neoplasm Proteins
- genetics
- metabolism
- Oxidative Phosphorylation
- Schizosaccharomyces
- genetics
- growth & development
- metabolism
- Schizosaccharomyces pombe Proteins
- genetics
- metabolism
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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