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• W3100916093 endingPage "3479" @default.
• W3100916093 startingPage "3468" @default.
• W3100916093 abstract "Somatic hypermutation (SHM) generates much of the Ab diversity necessary for affinity maturation and effective humoral immunity. The activation-induced cytidine deaminase-induced DNA lesions and error-prone repair that underlie SHM are known to exhibit intrinsic biases when targeting the Ig sequences. Computational models for SHM targeting often model the targeting probability of a nucleotide in a motif-based fashion, assuming that the same DNA motif is equally likely to be targeted regardless of its position along the Ig sequence. The validity of this assumption, however, has not been rigorously studied in vivo. In this study, by analyzing a large collection of 956,157 human Ig sequences while controlling for the confounding influence of selection, we show that the likelihood of a DNA 5-mer motif being targeted by SHM is not the same at different positions in the same Ig sequence. We found position-dependent differential SHM targeting for about three quarters of the 38 and 269 unique motifs from more than half of the 292 and 1912 motif-allele pairs analyzed using productive and nonproductive Ig sequences, respectively. The direction of the differential SHM targeting was largely conserved across individuals with no allele-specific effect within an IgH variable gene family, but was not consistent with general decay of SHM targeting with increasing distance from the transcription start site. However, SHM targeting did correlate positively with the mutability of the wider sequence neighborhood surrounding the motif. These findings provide insights and future directions for computational efforts toward modeling SHM." @default.
• W3100916093 created "2020-11-23" @default.
• W3100916093 creator A5038656678 @default.
• W3100916093 creator A5066198076 @default.
• W3100916093 date "2020-12-15" @default.
• W3100916093 modified "2023-10-01" @default.
• W3100916093 title "Position-Dependent Differential Targeting of Somatic Hypermutation" @default.
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• W3100916093 doi "https://doi.org/10.4049/jimmunol.2000496" @default.
• W3100916093 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7726104" @default.
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• W3100916093 hasPublicationYear "2020" @default.
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