RPA-like Mammalian Ctc1-Stn1-Ten1 Complex Binds to Single-Stranded DNA and Protects Telomeres Independently of the Pot1 Pathway
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Budding yeast Cdc13, Stn1, and Ten1 form the CST complex to protect telomeres from lethal DNA degradation. It remains unknown whether similar complexes are conserved in higher eukaryotes or not. Here we isolated mammalian STN1 and TEN1 homologs and CTC1 (conserved telomere maintenance component 1). The three proteins contain putative OB-fold domains and form a complex called CST, which binds to single-stranded DNA with high affinity in a sequence-independent manner. CST associates with a fraction of telomeres consistently during the cell cycle, in quiescent cells and Pot1-knockdown cells. It does not colocalize with replication foci in S phase. Significant increases in the abundance of single-stranded G-strand telomeric DNA were observed in Stn1-knockdown cells. We propose that CST is a replication protein A (RPA)-like complex that is not directly involved in conventional DNA replication at forks but plays a role in DNA metabolism frequently required by telomeres.
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Five of the seven identified LTL-associated loci contain genes (TERC, TERT, NAF1, OBFC1, RTEL1) known to be involved in telomere biology.
“Five of the loci contain genes (TERC, TERT, NAF1, OBFC1, RTEL1) that are known to be involved in telomere biology.”
From Identification of seven loci affecting mean telomere length and their association with disease (2013) · cites this paper as [21]
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- Authors
- Miyake, Y., Nakamura, M., Nabetani, A., Shimamura, S., Tamura, M., Yonehara, S., Saito, M., & Ishikawa, F.
- Affiliations
- Kyoto University (JP)
- Corresponding author
- Ishikawa, Fuyuki
- Venue
- Molecular Cell
- Publisher
- Elsevier BV
- Published
- 2009-10
- Volume
- 36
- Issue
- 2
- Pages
- 193-206
- ISSN
- 1097-2765 (ISSN-L)
- OpenAlex
- W1965580483
- Cited by
- 350
- References
- 37
- Citations by year
- 2026: 8 · 2025: 9 · 2024: 19 · 2023: 20 · 2022: 17 · 2021: 23 · 2020: 15 · 2019: 16 · 2018: 20 · 2017: 20 · 2016: 32 · 2015: 12 · 2014: 27 · 2013: 26 · 2012: 30
- FWCI
- 18.77
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Molecular Cell (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Ministry of Education, Culture, Sports, Science and Technology
- Topics
- Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA and Nucleic Acid Chemistry
- Keywords
- CST complex, CTC1, Stn1, Ten1, telomere protection, single-stranded DNA binding, OB-fold domain, POT1, replication protein A, telomeric DNA, DNA metabolism, telomere maintenance
- MeSH terms
- Shelterin Complex, Animals, Base Sequence, DNA, Single-Stranded, HeLa Cells, Humans, Molecular Sequence Data, Protein Binding, Recombinant Proteins, Telomere, Sequence Homology, Amino Acid, Protein Structure, Tertiary, Protein Transport, Telomere-Binding Proteins, Multiprotein Complexes, Mutant Proteins, Mice, Replication Protein A, Protein Multimerization
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