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Frank EG, Tissier A, McDonald JP, Rapić-Otrin V, Zeng X, Gearhart PJ, Woodgate R. Altered nucleotide misinsertion fidelity associated with poliota-dependent replication at the end of a DNA template. EMBO J 2001; 20:2914-22. [PMID: 11387224 PMCID: PMC125476 DOI: 10.1093/emboj/20.11.2914] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2000] [Revised: 03/30/2001] [Accepted: 03/30/2001] [Indexed: 11/12/2022] Open
Abstract
A hallmark of human DNA polymerase iota (poliota) is the asymmetric fidelity of replication at template A and T when the enzyme extends primers annealed to a single-stranded template. Here, we report on the efficiency and accuracy of poliota-dependent replication at a nick, a gap, the very end of a template and from a mispaired primer. Poliota cannot initiate synthesis on a nicked DNA substrate, but fills short gaps efficiently. Surprisingly, poliota's ability to blunt-end a 1 bp recessed terminus is dependent upon the template nucleotide encountered and is highly erroneous. At template G, both C and T are inserted with roughly equal efficiency, whilst at template C, C and A are misinserted 8- and 3-fold more often than the correct base, G. Using substrates containing mispaired primer termini, we show that poliota can extend all 12 mispairs, but with differing efficiencies. Poliota can also extend a tandem mispair, especially when it is located within a short gap. The enzymatic properties of poliota appear consistent with that of a somatic hypermutase and suggest that poliota may be one of the low-fidelity DNA polymerases hypothesized to participate in the hypermutation of immunoglobulin variable genes in vivo.
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Affiliation(s)
- Ekaterina G. Frank
- Section on DNA Replication, Repair and Mutagenesis, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892-2725 and Laboratory of Molecular Genetics, National Institute on Aging, National Institutes of Health, Baltimore, MD 21224, USA Present address: UPR 9003, CNRS, Cancérogenèse et Mutagenèse Moléculaire et Structurale, ESBS, Blvd S. Brant, 67400 Strasbourg, France Present address: Aptus Genomics, 9700 Great Seneca Hwy, Rockville, MD 20850, USA Present address: University of Pittsburgh School of Medicine, Department of Molecular Genetics and Biochemistry, E1240 Biomedical Science Tower, Pittsburgh, PA 15261, USA Corresponding author e-mail:
| | - Agnès Tissier
- Section on DNA Replication, Repair and Mutagenesis, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892-2725 and Laboratory of Molecular Genetics, National Institute on Aging, National Institutes of Health, Baltimore, MD 21224, USA Present address: UPR 9003, CNRS, Cancérogenèse et Mutagenèse Moléculaire et Structurale, ESBS, Blvd S. Brant, 67400 Strasbourg, France Present address: Aptus Genomics, 9700 Great Seneca Hwy, Rockville, MD 20850, USA Present address: University of Pittsburgh School of Medicine, Department of Molecular Genetics and Biochemistry, E1240 Biomedical Science Tower, Pittsburgh, PA 15261, USA Corresponding author e-mail:
| | - John P. McDonald
- Section on DNA Replication, Repair and Mutagenesis, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892-2725 and Laboratory of Molecular Genetics, National Institute on Aging, National Institutes of Health, Baltimore, MD 21224, USA Present address: UPR 9003, CNRS, Cancérogenèse et Mutagenèse Moléculaire et Structurale, ESBS, Blvd S. Brant, 67400 Strasbourg, France Present address: Aptus Genomics, 9700 Great Seneca Hwy, Rockville, MD 20850, USA Present address: University of Pittsburgh School of Medicine, Department of Molecular Genetics and Biochemistry, E1240 Biomedical Science Tower, Pittsburgh, PA 15261, USA Corresponding author e-mail:
| | - Vesna Rapić-Otrin
- Section on DNA Replication, Repair and Mutagenesis, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892-2725 and Laboratory of Molecular Genetics, National Institute on Aging, National Institutes of Health, Baltimore, MD 21224, USA Present address: UPR 9003, CNRS, Cancérogenèse et Mutagenèse Moléculaire et Structurale, ESBS, Blvd S. Brant, 67400 Strasbourg, France Present address: Aptus Genomics, 9700 Great Seneca Hwy, Rockville, MD 20850, USA Present address: University of Pittsburgh School of Medicine, Department of Molecular Genetics and Biochemistry, E1240 Biomedical Science Tower, Pittsburgh, PA 15261, USA Corresponding author e-mail:
| | - Xianmin Zeng
- Section on DNA Replication, Repair and Mutagenesis, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892-2725 and Laboratory of Molecular Genetics, National Institute on Aging, National Institutes of Health, Baltimore, MD 21224, USA Present address: UPR 9003, CNRS, Cancérogenèse et Mutagenèse Moléculaire et Structurale, ESBS, Blvd S. Brant, 67400 Strasbourg, France Present address: Aptus Genomics, 9700 Great Seneca Hwy, Rockville, MD 20850, USA Present address: University of Pittsburgh School of Medicine, Department of Molecular Genetics and Biochemistry, E1240 Biomedical Science Tower, Pittsburgh, PA 15261, USA Corresponding author e-mail:
| | - Patricia J. Gearhart
- Section on DNA Replication, Repair and Mutagenesis, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892-2725 and Laboratory of Molecular Genetics, National Institute on Aging, National Institutes of Health, Baltimore, MD 21224, USA Present address: UPR 9003, CNRS, Cancérogenèse et Mutagenèse Moléculaire et Structurale, ESBS, Blvd S. Brant, 67400 Strasbourg, France Present address: Aptus Genomics, 9700 Great Seneca Hwy, Rockville, MD 20850, USA Present address: University of Pittsburgh School of Medicine, Department of Molecular Genetics and Biochemistry, E1240 Biomedical Science Tower, Pittsburgh, PA 15261, USA Corresponding author e-mail:
| | - Roger Woodgate
- Section on DNA Replication, Repair and Mutagenesis, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892-2725 and Laboratory of Molecular Genetics, National Institute on Aging, National Institutes of Health, Baltimore, MD 21224, USA Present address: UPR 9003, CNRS, Cancérogenèse et Mutagenèse Moléculaire et Structurale, ESBS, Blvd S. Brant, 67400 Strasbourg, France Present address: Aptus Genomics, 9700 Great Seneca Hwy, Rockville, MD 20850, USA Present address: University of Pittsburgh School of Medicine, Department of Molecular Genetics and Biochemistry, E1240 Biomedical Science Tower, Pittsburgh, PA 15261, USA Corresponding author e-mail:
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