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- W2126184276 abstract "Abstract Several mechanisms that diversify the adult immune repertoire, such as terminal deoxynucleotidyl transferase-dependent N region addition, are not available to the neonatal mouse. One important process that contributes to protective immunity in the adult is somatic mutation, which plays a major role in the generation of high affinity memory B cells. It is not clear whether B cells in the neonatal mouse can activate the somatic mutation machinery. To investigate this, we immunized neonates with poly(l-Tyr,l-Glu)-poly-d, l-Ala–poly-l-Lys complexed with methylated BSA, or (4-hydroxy-3-nitrophenyl)acetyl coupled to chicken γ-globulin. Eight to fourteen days after priming, V(D)J rearrangements of known VH genes (VHSM7 family) were screened for mutations using a temperature-melt hybridization assay and oligonucleotide probes specific for complementarity-determining regions I and II; possible mutations were confirmed by sequence analysis. More mutations per sequence were found in heavy chains from neonates immunized with (4-hydroxy-3-nitrophenyl)acetyl coupled to chicken γ-globulin than in those from neonates immunized with poly(l-Tyr, l-Glu)-poly-d,l-Ala-poly-l-Lys complexed with methylated BSA. Mutations were found in heavy chains lacking N regions, suggesting that B cells of the putative fetal lineage can somatically mutate and diversify an initially limited repertoire. Since neonates immunized as early as 1 or 2 days after birth had mutations, the somatic mutation machinery can be activated soon after birth, suggesting that early vaccination should result in affinity maturation and protective immunity in the neonate." @default.
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- W2126184276 creator A5008861965 @default.
- W2126184276 creator A5043871347 @default.
- W2126184276 date "1998-12-01" @default.
- W2126184276 modified "2023-10-16" @default.
- W2126184276 title "Somatic Mutation in the Neonatal Mouse" @default.
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- W2126184276 doi "https://doi.org/10.4049/jimmunol.161.11.6093" @default.
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