Activation-induced cytidine deaminase (AID) is required for somatic hypermutation (SHM) and class switch recombination (CSR) of the immunoglobulin (Ig) gene. AID has been reported to be specifically expressed in the germinal center (GC). Follicular lymphoma (FL) cells are known to be exposed to GC reaction, as characterized by a high degree of SHM with some heterogeneity in terms of intraclonal microheterogeneity and antigen selection. The heterogeneity of SHM pattern in FL intrigued us to investigate the AID expression. AID expression was investigated in 19 FL materials consisting of 15 cases of FL fresh cells and four cell lines. In all, 10 fresh cells and three cell lines expressed AID, but the others did not. SHM was investigated in 12 fresh cells and four cell lines. The ongoing mutation was significantly different between AID-positive and AID-negative FL fresh cells (unpaired Student's t-test, P ¼ 0.047). Ongoing mutation was not seen in any of the cell lines. AID expression was associated with the ongoing mutation in FL fresh cells (two-tailed Pearson's coefficient correlation, r ¼ 0.899, P ¼ 0.01). The switch off of AID expression may start in the B-lineage differentiation stage counterpart of FL after optimizing SHM, indicated by the cessation of the ongoing mutation in AID-negative FL fresh cells.
Aim: To assess CML patient's characteristic including demographic, clinical and hematological characteristic of patients with CML including quantitative BCR-ABL and BCR-ABL gene sequencing. Methods: This study was an open-label, single arm, non-randomized, cross sectional study in patients with CML being treated with imatinib mesylate (IM) from 12 centers. Result: A total of 100 patients were evaluated between January 1, 2009 and December 31, 2011. The median age was 34-35 years old (mean of age is 36 years old), and more patients in the productive age was found.-(?) were 80 of the 100 patients who had been examined for the BCR-ABL gene mutation with the sequencing method before consuming IM. Mutation in the P-loop was seen in 2,27% (1 out of 44 patients), this finding was beyond our expectation since 47,69% (31 out of 65 patients) of our patients did not achieved CHR at three months. On the other hand, 15,9% (7 out of 44 patients) of our patients had mutation outside the P-loop. Conclusions: The characteristics of CML patients in Indonesia were not different from CML patients in Asia in general. Our finding concerning the high frequency mutation in the BCR-ABL gene outside the P-loop needs further study.
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