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Somatic mutation hotspots correlate with DNA polymerase eta error spectrum.
I B Rogozin1, Y I Pavlov, K Bebenek
1Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, Novosibirsk 630090, Russia.
Nature Immunology
|May 29, 2001
Summary
Somatic hypermutation in immunoglobulin genes involves specific DNA sequence motifs, RGYW and WA. DNA polymerase eta errors may explain strand-specific mutations at A-T base pairs, particularly at WA hotspots.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- Somatic hypermutation (SHM) is crucial for antibody diversity.
- Understanding the molecular mechanisms driving SHM, including DNA sequence motifs and polymerase activity, is essential.
Purpose of the Study:
- To identify universal descriptors of somatic hypermutation in immunoglobulin genes.
- To investigate the role of DNA polymerase eta in generating mutation hotspots.
Main Methods:
- Analysis of mutational spectra across 15 immunoglobulin genes.
- Comparison of identified mutation hotspots with DNA polymerase error spectra, specifically human polymerase eta.
Main Results:
- Consensus motifs RGYW and WA were identified as universal descriptors of SHM.
- WA hotspots were strand-preferential, while RGYW hotspots appeared on both DNA strands.
- A significant majority (33/36) of human polymerase eta hotspots matched the WA consensus.
Conclusions:
- The RGYW and WA motifs are key descriptors of SHM.
- DNA polymerase eta's error spectrum aligns with WA hotspots, suggesting its role in A-T base pair mutagenesis during SHM.
- Polymerase eta activity on the non-transcribed strand may drive strand-specific SHM in immunoglobulin genes.