Germline deletion of ETV6 in familial acute lymphoblastic leukemia

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Germline deletion of ETV6 in familial acute lymphoblastic leukemia by Evadnie Rampersaud, David S. Ziegler, Ilaria Iacobucci, Debbie Payne-Turner, Michelle L. Churchman, Kasmintan A. Schrader, Vijai Joseph, Kenneth Offit, Katherine Tucker, Rosemary Sutton, Meera Warby, Georgia Chenevix-Trench, David G. Huntsman, Maria Tsoli, R. Scott Mead, Chunxu Qu, Vasiliki Leventaki, Gang Wu, and Charles G. Mullighan BloodAdv Volume 3(7):1039-1046 April 9, 2019 © 2019 by The American Society of Hematology

Evadnie Rampersaud et al. Blood Adv 2019;3:1039-1046 © 2019 by The American Society of Hematology

Linkage mapping to chromosome 12 in a kindred with ALL and DLBCL Linkage mapping to chromosome 12 in a kindred with ALL and DLBCL. (A) A 5-generation kindred with 10 individuals with leukemia, DLBCL, aplastic anemia, and/or thrombocytopenia. Linkage mapping to chromosome 12 in a kindred with ALL and DLBCL. (A) A 5-generation kindred with 10 individuals with leukemia, DLBCL, aplastic anemia, and/or thrombocytopenia. Black crosses indicate samples subjected to WGS, and red crosses indicate samples subjected to WES. Squares and circles represent male and females, respectively. All family members with ALL or DLBCL sequenced harbored the ETV6 deletion. Individuals III.3 and III.4 (DLBCL) both had thrombocytopenia and the deletion; IV.3 and III.2 had normal platelet counts and no ETV6 deletion. (B) Multipoint linkage results highlighting region with a logarithm of the odds (LOD) score of 1.8. (C) Representative reads showing the exon 7 splice site deletion identified by WGS SV analysis (NM_001987.4:G.11885871_11885946del;NM_001987.4:c.1153-55_1173del). (D) RNA-sequencing coverage analysis showing reduced sequence depth at exon 7. (E) Protein truncation resulting from exon skipping. (F) Schematic representation of the ETV6 protein, including the sterile α motif (SAM)/pointed domain of Tel/Yan protein, the polypeptide -binding domain, and the erythroblast transformation-specific domain (ETS). The top pair of electropherograms is from genomic PCR and Sanger sequencing and compares wild-type (WT) and deleted (75-bp) ETV6. Dotted line in the ETV6 cartoon represents exon junctions. The lower electropherogram is from RT-PCR and Sanger sequencing and shows the skipping of exon 7 and splicing of exon 6 to exon 8 in tumor RNA. (G) Results from fragment size analysis showing amplification of both WT and deleted ETV6 alleles. Evadnie Rampersaud et al. Blood Adv 2019;3:1039-1046 © 2019 by The American Society of Hematology

Characterization of tumors in the ETV6-mutated kindred. Characterization of tumors in the ETV6-mutated kindred. (A) Immunohistochemistry of the DLBCL tumor is consistent with mature B-cell lineage, with expression of CD20 and lack of expression of the immature markers CD34 and TdT and the T-cell marker CD3, which highlights admixed small T cells (original magnification ×40; scale bars, 50 μm). (B) Mutational analysis of WGS data showing distinct ALL and DLBCL mutational spectra of each sample. (C) Gene set enrichment analysis (GSEA) from RNA sequencing of tumor sample showing enrichment of B lymphoid progenitor genes in the B-cell ALL sample (D) and genes expressed in lymphoma in the DLBCL sample. Collectively, the pathologic and genomic features support a true DLBCL in case III.4 rather than a lymphomatous presentation of ALL. Tdt, terminal deoxynucleotidyltransferase. Evadnie Rampersaud et al. Blood Adv 2019;3:1039-1046 © 2019 by The American Society of Hematology

Workflow showing optimal practices for identification of germline variants predisposing to familial leukemia, incorporating analysis of soft-clipped reads. Workflow showing optimal practices for identification of germline variants predisposing to familial leukemia, incorporating analysis of soft-clipped reads. BWA, Burrows-Wheeler Aligner; LOD, logarithm of the odds. Evadnie Rampersaud et al. Blood Adv 2019;3:1039-1046 © 2019 by The American Society of Hematology