Analysis of somatic hypermutations in the IgM switch region in human B cells Katsuyuki Horiuchi, MD, PhD, Kohsuke Imai, MD, PhD, Kanako Mitsui-Sekinaka,

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Presentation transcript:

Analysis of somatic hypermutations in the IgM switch region in human B cells Katsuyuki Horiuchi, MD, PhD, Kohsuke Imai, MD, PhD, Kanako Mitsui-Sekinaka, MD, Tzu-Wen Yeh, BSc, Hans D. Ochs, MD, PhD, Anne Durandy, MD, PhD, Shigeaki Nonoyama, MD, PhD Journal of Allergy and Clinical Immunology Volume 134, Issue 2, Pages 411-419.e1 (August 2014) DOI: 10.1016/j.jaci.2014.02.043 Copyright © 2014 American Academy of Allergy, Asthma & Immunology Terms and Conditions

Fig 1 Sequence region for the analysis of mutations in Smu-SHM. A, We amplified, subcloned, and sequenced the 5′ region of the highly repetitive GC-rich region of the IgM gene (Smu core) using Pfu polymerase. B, Percentages of G and C nucleotides (G/C contents) are equally distributed throughout the sequence region. C, Percentages of RGYW/WRCY motifs in each 100-bp fragment are not significantly different throughout the sequence region. CHmu1-4, Exons of the constant region of IgM; Imu, enhancer exon of the IgM gene; R, purines (A/G); W, A/T; Y, pyrimidines (C/T). Journal of Allergy and Clinical Immunology 2014 134, 411-419.e1DOI: (10.1016/j.jaci.2014.02.043) Copyright © 2014 American Academy of Allergy, Asthma & Immunology Terms and Conditions

Fig 2 Smu-SHMs induced by anti-CD40 mAb and IL-4 in vitro in PBMCs of the control subjects. A, Smu-SHMs were analyzed before and after stimulation of PBMCs from control subjects (n = 4) with anti-CD40 mAb and IL-4 for 5 days in vitro. Mutations were rarely found before stimulation (Pre, 0.006% ± 0.004% bp) but were significantly increased after stimulation with anti-CD40 mAb and IL-4 in vitro (Post, 0.04% ± 0.02% bp, P = .0361). The VH-SHMs at the JH4-JH5 region were analyzed, but no significant difference was observed because of stimulation. B, The Smu-SHM pattern observed after stimulation with anti-CD40 mAb and IL-4 is shown. The germline nucleotides are shown on the left (from), and the mutated nucleotides are shown on the top (to). The right column indicates the sum of the mutated nucleotides for each row. The GC target indicates the mutations at G or C. The GC transition indicates the frequency of transition mutations at G and C (G>A and C>T) of the total mutations at G and C. The AT transition indicates the frequency of transition mutations at A and C (A>G and T>C) of the total mutations at A and T. Journal of Allergy and Clinical Immunology 2014 134, 411-419.e1DOI: (10.1016/j.jaci.2014.02.043) Copyright © 2014 American Academy of Allergy, Asthma & Immunology Terms and Conditions

Fig 3 In vivo Smu-SHMs in control subjects. A, We purified IgD+IgM+CD27− (naive), IgD+IgM+CD27+ (unswitched memory), and IgD−IgM−CD27+ (switched memory) B cells from control subjects (n = 4) using fluorescence-activated cell sorting. Representative fluorescence-activated cell sorting data are shown. B, We found a higher frequency of Smu-SHMs in IgD−IgM−CD27+ B cells, which are class-switched, and V region–mutated B cells, than in IgD+IgM+CD27+ B cells, which are V region mutated but not class-switched B cells. The IgD+IgM+CD27− (naive) B cells presented the lowest frequency of Smu-SHMs. C, The mutation patterns of unswitched (left) and switched (right) memory B cells are shown. Journal of Allergy and Clinical Immunology 2014 134, 411-419.e1DOI: (10.1016/j.jaci.2014.02.043) Copyright © 2014 American Academy of Allergy, Asthma & Immunology Terms and Conditions

Fig 4 Distribution of Smu-SHMs in each fraction of control B cells in vivo. A-C, The frequency of Smu-SHMs was higher in the 3′ region than in the 5′ region in both IgD− (switched) and IgD+ (unswitched) fractions of CD27+ B cells. D, Means ± SDs of Smu-SHMs in each region are shown (n = 4). Journal of Allergy and Clinical Immunology 2014 134, 411-419.e1DOI: (10.1016/j.jaci.2014.02.043) Copyright © 2014 American Academy of Allergy, Asthma & Immunology Terms and Conditions

Fig 5 Target motifs of Smu-SHMs in each fraction of control B cells in vivo. The Smu-SHMs of the control subjects in vivo (n = 4) were analyzed according to their target motifs in each fraction of B cells (IgD+IgM+CD27+ and IgD−IgM−CD27+ B cells). R, Purines (A/G); W, A/T; Y, pyrimidines (C/T). Journal of Allergy and Clinical Immunology 2014 134, 411-419.e1DOI: (10.1016/j.jaci.2014.02.043) Copyright © 2014 American Academy of Allergy, Asthma & Immunology Terms and Conditions

Fig 6 Smu-SHMs in patients with CD40L, AID, and UNG deficiency in vivo. A, Smu-SHMs in the CD27+ fraction of B cells from control adults (C1-C4), control children (C5-C7), and AID-deficient (P1-P5), UNG-deficient (P6 and P7), and CD40L-deficient (P8-11) patients. The frequency of Smu-SHMs was decreased in patients with AID (P1-P5) and CD40L (P8-11) deficiency. In patients with UNG deficiency, the Smu-SHM frequency was decreased in P6 but increased in P7. B, The mutations were significantly targeted and biased to transition at G and C in UNG-deficient patients (P6 and P7). Journal of Allergy and Clinical Immunology 2014 134, 411-419.e1DOI: (10.1016/j.jaci.2014.02.043) Copyright © 2014 American Academy of Allergy, Asthma & Immunology Terms and Conditions

Fig E1 Smu-SHMs might correspond to the extension of the R-loop. We found more mutations in the 3′ part of the sequenced region, which is close to the Smu core region, than in the 5′ region in both unswitched and switched memory B cells. Furthermore, we found more mutations in the 5′ part of the sequenced region in switched memory B cells than in unswitched memory B cells. These findings might indicate the extension of the R-loop during CSR. Journal of Allergy and Clinical Immunology 2014 134, 411-419.e1DOI: (10.1016/j.jaci.2014.02.043) Copyright © 2014 American Academy of Allergy, Asthma & Immunology Terms and Conditions