{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,4,4]],"date-time":"2024-04-04T08:20:41Z","timestamp":1712218841626},"reference-count":85,"publisher":"Cold Spring Harbor Laboratory","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Cold Spring Harb Mol Case Stud"],"published-print":{"date-parts":[[2020,2]]},"abstract":"<jats:p>Transformation of follicular lymphoma (FL) into B-lymphoblastic leukemia\/lymphoma (B-ALL\/LBL) is rare and results in greatly increased aggressiveness of clinical course. Here we present extensive molecular analysis of this unusual transformation, including immunoglobulin (Ig) gene rearrangement studies, cytogenetic analysis, and whole-exome sequencing (WES) of the patient's FL, B-ALL\/LBL, and normal cells. Although FL showed marked somatic hypermutation (SHM) of the Ig genes, SHM appeared to be even more extensive in B-ALL\/LBL. Cytogenetically, at least three translocations were identified in the B-ALL\/LBL involving the <jats:italic>BCL2<\/jats:italic>, <jats:italic>BCL6<\/jats:italic>, and <jats:italic>MYC<\/jats:italic> genes; two of these, the <jats:italic>BCL6<\/jats:italic> and <jats:italic>BCL2<\/jats:italic> gene rearrangements, were already seen at the FL stage. WES identified 751 single-nucleotide variants with high allelic burden in the patient's cells, with the vast majority (575) present exclusively at the B-ALL\/LBL stage. Of note, a <jats:italic>TAF3<\/jats:italic> gene mutation was shared by normal, FL, and B-ALL\/LBL tissue. A <jats:italic>KMT2D<\/jats:italic> nonsense mutation was identified in both FL and B-ALL\/LBL and therefore may have contributed directly to lymphomagenesis. Mutations in <jats:italic>KDM6A<\/jats:italic>, <jats:italic>SMARCA4<\/jats:italic>, <jats:italic>CBX1<\/jats:italic>, and <jats:italic>JMY<\/jats:italic> were specific to the B-ALL\/LBL stage, possibly contributing to the B-ALL\/LBL transformation. Functionally, these identified mutations may lead to dysregulation of DNA repair, transcription, and cell differentiation. Thus, these genetic changes, together with the identified chromosomal translocations, may have contributed to lymphoma development and progression. Our findings may improve the mechanistic understanding of the FL-B-ALL\/LBL transformation and may have therapeutic implications for this aggressive disease.<\/jats:p>","DOI":"10.1101\/mcs.a004614","type":"journal-article","created":{"date-parts":[[2019,11,27]],"date-time":"2019-11-27T20:35:15Z","timestamp":1574886915000},"page":"a004614","source":"Crossref","is-referenced-by-count":4,"title":["Dramatic increase in gene mutational burden after transformation of follicular lymphoma into TdT<sup>+<\/sup> B-lymphoblastic leukemia\/lymphoma"],"prefix":"10.1101","volume":"6","author":[{"given":"Jonathan P.","family":"Belman","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wenzhao","family":"Meng","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hong Yi","family":"Wang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jie","family":"Li","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Honore T.","family":"Strauser","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Aaron M.","family":"Rosenfeld","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Qian","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eline T. 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