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Maekawa F, Hayashida M, Takeoka K, Fukutsuka K, Nakagawa M, Akasaka T, Sakamoto S, Sumiyoshi S, Kobashi Y, Ohno H. Two recurrent types of IGH::5' BCL2 breakpoints representing cytogenetic ins(14;18)(q32;q21q21) and t(14;18)(q32;q21), mediated by the VDJ and class switch recombination processes, respectively. Leuk Lymphoma 2024:1-10. [PMID: 38608254 DOI: 10.1080/10428194.2024.2341333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2024] [Accepted: 04/03/2024] [Indexed: 04/14/2024]
Abstract
We describe two types of IGH::BCL2 breakpoints involving the 5' region of BCL2 (5' BCL2). One was ins(14;18)(q32;q21q21) observed in 2 follicular lymphoma (FL) cases, in which IGH was cleaved at 3' of IGHD and 5' of IGHJ and BCL2 was cleaved at 5' BCL2 and downstream regions, and a 281- or 201-kilobase pair fragment containing the BCL2 protein-coding sequences was invertedly inserted into IGH. In another type observed in 2 FL and 2 chronic lymphocytic leukemia (CLL) cases, breakage and reunion occurred within the switch region associated with IGHM (Sµ) and 5' BCL2, creating IGH Sµ::5' BCL2 fusion sequences on der(18)t(14;18)(q32;q21). The former is considered to be mediated by VDJ-recombination, while the latter by the class switch recombination process. There were no particular features in FL or CLL cases with IGH::5' BCL2 breakpoints compared with those with t(14;18)(q32;q21)/IGH::BCL2 involving the 3' breakpoint cluster regions.
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Affiliation(s)
- Fumiyo Maekawa
- Tenri Institute of Medical Research, Tenri Hospital, Tenri, Nara, Japan
| | | | - Kayo Takeoka
- Tenri Institute of Medical Research, Tenri Hospital, Tenri, Nara, Japan
| | | | - Miho Nakagawa
- Tenri Institute of Medical Research, Tenri Hospital, Tenri, Nara, Japan
| | - Takashi Akasaka
- Department of Hematology, Tenri Hospital, Tenri, Nara, Japan
| | - Shinichi Sakamoto
- Department of Diagnostic Pathology, Tenri Hospital, Tenri, Nara, Japan
| | - Shinji Sumiyoshi
- Department of Diagnostic Pathology, Tenri Hospital, Tenri, Nara, Japan
| | - Yoichiro Kobashi
- Department of Diagnostic Pathology, Tenri Hospital, Tenri, Nara, Japan
| | - Hitoshi Ohno
- Tenri Institute of Medical Research, Tenri Hospital, Tenri, Nara, Japan
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