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Functional genomics of tumor suppressor miR-196b in T-cell acute lymphoblastic leukemia

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Abstract

Huge data accumulated in last few years have shown that differential expression of candidate miRNAs in normal versus transformed cell provides important insights into the pathogenesis of cancer including leukemias. In our previous report, we have revealed that miR-196b was significantly down-regulated in both EB-3 cells as well as B-cell ALL (acute lymphoblastic leukemia) patients as compared to their respective controls. We have unambiguously proven that miR-196b restoration in EB-3 cells leads to significant down-regulation of c-myc and its effector genes, i.e., human telomerase reverse transcriptase (hTERT), B-cell lymphoma/leukemia-2 (Bcl-2), apoptosis antagonizing transcription factor (AATF), and qualifies for tumor suppressor function in B-cell ALL. Keeping in view these results, the present study was aimed at dissecting the role of miR-196b and other miRNAs present near/within the genomic regions involved in genetic translocations characteristic of ALL in T-cell ALL cell lines and patient samples. We have demonstrated significant down-regulation in the expression of miR-196b in MOLT-4 and T-cell ALL patients with respect to the respective control cells. Transfection experiments revealed that none of the six identified miRNAs were able to knock down the expression of c-myc gene. Interestingly, it was found that miR-196b loses its ability to down-regulate c-myc gene expression in T-cell ALL as a consequence of mutations in target 3′-untranslated region (3′-UTR) of the c-myc gene. Results of the present study revealed that miR-196b becomes non-functional in T-cell ALL as a consequence of mutations in 3′-UTR of c-myc gene in T-cell ALL cellular models.

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Acknowledgments

We would like to thank the Department of Biotechnology (D.B.T., Govt. of India, New Delhi).

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Authors and Affiliations

  1. Molecular Biology Unit, Department of Experimental Medicine and Biotechnology, Postgraduate Institute of Medical Education and Research, Chandigarh, 160012, India

    Suman Bhatia & Deepak Kaul

  2. Department of Hematology, Postgraduate Institute of Medical Education and Research, Chandigarh, 160012, India

    Neelam Varma

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  1. Suman Bhatia
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  2. Deepak Kaul
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Correspondence to Deepak Kaul.

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Bhatia, S., Kaul, D. & Varma, N. Functional genomics of tumor suppressor miR-196b in T-cell acute lymphoblastic leukemia. Mol Cell Biochem 346, 103–116 (2011). https://doi.org/10.1007/s11010-010-0597-0

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