ATM deficiency alters in-frame and out-of-frame junctional sequences of TCRβ CDR3 in pre- and post-selection T cells.

(A) Diagram of TCRβ CDR3 junctions. Nucleotide deletions and additions were sequenced from in-frame and out-of-frame TCRβ CDR3 regions isolated from ATMWT (grey bars) or KO (white bars) cells that were either TCRα KO DP thymocytes (B and C) or naïve CD4⁺ T cells (D and E). TCRαKO DP and naïve CD4⁺ T cells were sorted from two mice of each ATM genotype. Each data point represents >55,000 sequences. P values were calculated using Student’s unpaired 2-tailed t-test. *p<0.05; **p<0.01; ***p<0.001.