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• W2769888990 abstract "Antibodies, an essential part of our immune system, develop through an intricate process to bind a wide array of pathogens. This process involves randomly mutating DNA sequences encoding these antibodies to find variants with improved binding, though mutations are not distributed uniformly across sequence sites. Immunologists observe this nonuniformity to be consistent with mutation motifs, which are short DNA subsequences that affect how likely a given site is to experience a mutation. Quantifying the effect of motifs on mutation rates is challenging: a large number of possible motifs makes this statistical problem high dimensional, while the unobserved history of the mutation process leads to a nontrivial missing data problem. We introduce an $ell_1$-penalized proportional hazards model to infer mutation motifs and their effects. In order to estimate model parameters, our method uses a Monte Carlo EM algorithm to marginalize over the unknown ordering of mutations. We show that our method performs better on simulated data compared to current methods and leads to more parsimonious models. The application of proportional hazards to mutation processes is, to our knowledge, novel and formalizes the current methods in a statistical framework that can be easily extended to analyze the effect of other biological features on mutation rates." @default.
• W2769888990 created "2017-12-04" @default.
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• W2769888990 date "2017-11-10" @default.
• W2769888990 modified "2023-10-03" @default.
• W2769888990 title "Survival analysis of DNA mutation motifs with penalized proportional hazards" @default.
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• W2769888990 doi "https://doi.org/10.48550/arxiv.1711.04057" @default.
• W2769888990 hasPublicationYear "2017" @default.
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