%0 Journal Article %T Diversity of T-cell receptor Gene Rearrangements in South Indian Patients with Common Acute Lymphoblastic Leukemia %J Iranian Journal of Immunology %I Shiraz Institute for Cancer Research %Z 1735-1383 %A Sudhakar, Natarajan %A Karunakaran Nancy, Nirmala %A Raghavan Rajalekshmy, Kamalalayam %A Rajkumar, Thangarajan %D 2009 %\ 09/01/2009 %V 6 %N 3 %P 141-146 %! Diversity of T-cell receptor Gene Rearrangements in South Indian Patients with Common Acute Lymphoblastic Leukemia %K TCR %K ALL %K Heteroduplex Analysis %R %X Background: Precursor B-Acute Lymphoblastic Leukemia (precursor B-ALL) oc-curs due to the uncontrolled proliferation of B-lymphoid precursors arrested at a par-ticular stage of B-cell development. Precursor-B-ALL is classified mainly into pro-B-ALL, common-ALL and pre-B-ALL. The Common Acute Lymphoblastic Antigen CD10 is the marker for common-ALL. Objective: This study was aimed to examine the diversity of T-cell receptor Gamma (TCRG) and T-cell receptor Delta (TCRD) gene rearrangements in South Indian Common-ALL patients. Methods: Clonality of TCRG and TCRD was studied in 52 cases (pediatric=41 and adolescents and young adults=11) of common-ALL. TCRG and TCRD gene rearrangements were amplified by PCR and the clonality was assessed by Heteroduplex analysis of amplified prod-ucts. Results: In pediatric common-ALL, clonal TCRG and TCRD gene rearrange-ments were detected in 19 (46.3%) and 18 (43.9%) cases respectively. In adolescents and young adults (AYA), TCRG was rearranged in 8 (72.7%) cases and TCRD was rearranged in 4 (36.3%) cases. In the present study of common-ALL, the frequency of a TCRG rearrangement VγII-Jγ1.3/2.3 was significantly high in AYA compared to pediatric (36.3% vs 4.8%; p<0.025). Thus, VγII-Jγ1.3/2.3 was highly diverse in AYA compared to pediatric. That shows the difference in biology of the disease be-tween pediatric and AYA in South Indian population. Conclusion: The reason for the high frequency of VγII-Jγ1.3/2.3 in AYA of common-ALL in South Indian popu-lation in connection with unknown infectious agents or environmental carcinogens needs to be evaluated further. %U https://iji.sums.ac.ir/article_17085_a77e45c16a359e1bc5112d65161c68e7.pdf