The percentage of B cells and antibody category conversion and reorganization decrease with age. This study is the first to report the homogeneity and heterogeneity of the CDR3 repertoire of central and peripheral B cells change as mice age, to further investigation of the decline and response of B cell immunity in young/middle/old-aged mice. The proportion of overlap in bone marrow and spleen B cells, but not spleen memory B cells, of mice at different ages was lower at 3РІР‚вЂ°months than at 12 and 20РІР‚вЂ°months. The BCR H-CDR3 repertoire diversity of mice bone marrow B cells, spleen B cells and spleen memory B cells decreased with increasing age. In the productive, pseudogene, and out-of-frame sequences, bone marrow B cells had significant differences in 5РІР‚Р†J trimming with age peripheral spleen B cells and memory B cells had significant differences in N1 insertion, N2 insertion, P5РІР‚в„ўD insertion, and 5РІР‚в„ўD trimming with age. In this study, we demonstrated that there were significant differences in the usage of some V, D, and J genes in the BCR H-CDR3 repertoire of bone marrow B cells, spleen B cells and spleen memory B cells in 3-, 12-, and 20-month-old mice. The diversity of mice central and peripheral B cell repertoires with increasing age has not been elucidated. The number of central and peripheral B cells and their responsiveness are decreased in aged mice.

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