PMID- 29957452 OWN - NLM STAT- MEDLINE DCOM- 20190911 LR - 20190911 IS - 1943-7811 (Electronic) IS - 1525-1578 (Linking) VI - 20 IP - 4 DP - 2018 Jul TI - Development of a Fluorescence in Situ Hybridization Probe for Detecting IKZF1 Deletion Mutations in Patients with Acute Lymphoblastic Leukemia. PG - 446-454 LID - S1525-1578(17)30412-9 [pii] LID - 10.1016/j.jmoldx.2018.02.005 [doi] AB - Intragenic deletion of IKZF1 is a recurrent genomic alteration in acute lymphoblastic leukemia. The deletions are mediated by illegitimate variable(diversity)joining recombination via cryptic recombination signal sequences (RSSs). We developed a fluorescence in situ hybridization (FISH) probe set that can detect any type of IKZF1 deletion, including the commonly deleted exon 4 to 7 region. The probe set consists of a designed probe for the commonly deleted region (Cy3; red) and a bacterial artificial chromosomes clone probe for detecting the 3' flanking region (Spectrum Green). Intact IKZF1 showed a fusion signal, and the deleted allele showed loss of the red signal (0R1G1F). The FISH probes worked correctly for human leukemic cell lines and clinical samples. One case showed an atypical break-apart signal (1R1G1F). Inverse PCR of the case revealed rearrangement of the excised IKZF1 fragment into a legitimate RSS site at Ig kappa on chromosome 2, suggesting a pathogenic role of this recombination-activating gene 1/2-mediated event. In this study, we established FISH probe detecting IKZF1 deletion in a quick, quantitative, and cost-effective manner, and the results provided a novel insight into B-cell receptor editing by rearrangement of a cryptic RSS-mediated genomic fragment in acute lymphoblastic leukemia pathology. CI - Copyright (c) 2018 American Society for Investigative Pathology and the Association for Molecular Pathology. Published by Elsevier Inc. All rights reserved. FAU - Hashiguchi, Junichi AU - Hashiguchi J AD - Department of Hematology, Hokkaido University Faculty of Medicine, Graduate School of Medicine, Sapporo, Japan. FAU - Onozawa, Masahiro AU - Onozawa M AD - Department of Hematology, Hokkaido University Faculty of Medicine, Graduate School of Medicine, Sapporo, Japan. Electronic address: masahiro.onozawa@nifty.ne.jp. FAU - Oguri, Satoshi AU - Oguri S AD - Division of Laboratory and Transfusion Medicine, Hokkaido University Hospital, Sapporo, Japan. FAU - Fujisawa, Shinichi AU - Fujisawa S AD - Division of Laboratory and Transfusion Medicine, Hokkaido University Hospital, Sapporo, Japan. FAU - Tsuji, Masahisa AU - Tsuji M AD - Chromosome Science Lab, Sapporo, Japan. FAU - Okada, Kohei AU - Okada K AD - Department of Hematology, Hokkaido University Faculty of Medicine, Graduate School of Medicine, Sapporo, Japan. FAU - Nakagawa, Masao AU - Nakagawa M AD - Department of Hematology, Hokkaido University Faculty of Medicine, Graduate School of Medicine, Sapporo, Japan. FAU - Hashimoto, Daigo AU - Hashimoto D AD - Department of Hematology, Hokkaido University Faculty of Medicine, Graduate School of Medicine, Sapporo, Japan. FAU - Kahata, Kaoru AU - Kahata K AD - Department of Hematology, Hokkaido University Faculty of Medicine, Graduate School of Medicine, Sapporo, Japan. FAU - Kondo, Takeshi AU - Kondo T AD - Department of Hematology, Hokkaido University Faculty of Medicine, Graduate School of Medicine, Sapporo, Japan. FAU - Shimizu, Chikara AU - Shimizu C AD - Division of Laboratory and Transfusion Medicine, Hokkaido University Hospital, Sapporo, Japan. FAU - Teshima, Takanori AU - Teshima T AD - Department of Hematology, Hokkaido University Faculty of Medicine, Graduate School of Medicine, Sapporo, Japan. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - J Mol Diagn JT - The Journal of molecular diagnostics : JMD JID - 100893612 RN - 0 (IKZF1 protein, human) RN - 0 (RNA Probes) RN - 148971-36-2 (Ikaros Transcription Factor) SB - IM MH - Adult MH - Aged MH - Aged, 80 and over MH - Base Sequence MH - Cell Line, Tumor MH - Child MH - Female MH - Humans MH - Ikaros Transcription Factor/*genetics MH - In Situ Hybridization, Fluorescence/*methods MH - Interphase MH - Male MH - Middle Aged MH - Precursor Cell Lymphoblastic Leukemia-Lymphoma/*genetics MH - RNA Probes/*metabolism MH - Sequence Deletion/*genetics MH - Young Adult EDAT- 2018/06/30 06:00 MHDA- 2019/09/12 06:00 CRDT- 2018/06/30 06:00 PHST- 2017/10/20 00:00 [received] PHST- 2018/02/26 00:00 [revised] PHST- 2018/02/27 00:00 [accepted] PHST- 2018/06/30 06:00 [entrez] PHST- 2018/06/30 06:00 [pubmed] PHST- 2019/09/12 06:00 [medline] AID - S1525-1578(17)30412-9 [pii] AID - 10.1016/j.jmoldx.2018.02.005 [doi] PST - ppublish SO - J Mol Diagn. 2018 Jul;20(4):446-454. doi: 10.1016/j.jmoldx.2018.02.005.