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- Title
PPP1R7 Is a Novel Translocation Partner of CBFB via t(2;16)(q37;q22) in Acute Myeloid Leukemia.
- Authors
Wang, Lulu; Wang, Wei; Beird, Hannah C.; Cheng, Xueqian; Fang, Hong; Tang, Guilin; Toruner, Gokce A.; Yin, C. Cameron; You, M. James; Issa, Ghayas C.; Borthakur, Gautam; Peng, Guang; Khoury, Joseph D.; Medeiros, L. Jeffrey; Tang, Zhenya
- Abstract
In a subset of acute myeloid leukemia (AML) cases, the core binding factor beta subunit gene (CBFB) was rearranged via inv(16)(p13.1q22) or t(16;16)(p13.1;q22), in which the smooth muscle myosin heavy chain 11 gene (MYH11) was the partner (CBFB::MYH11). Rare variants of CBFB rearrangement occurring via non-classic chromosomal aberrations have been reported, such as t(1;16), t(2;16), t(3;16), t(5;16), and t(16;19), but the partners of CBFB have not been characterized. We report a case of AML with a complex karyotype, including t(2;16)(q37;q22), in which the protein phosphatase 1 regulatory subunit 7 gene (PPP1R7) at chromosome 2q37 was rearranged with CBFB (CBFB::PPP1R7). This abnormality was inconspicuous by conventional karyotype and interphase fluorescence in situ hybridization (FISH), thus leading to an initial interpretation of inv(16)(p13.1q22); however, metaphase FISH showed that the CBFB rearrangement involved chromosome 2. Using whole genome and Sanger sequencing, the breakpoints were identified as being located in intron 5 of CBFB and intron 7 of PPP1R7. A microhomology of CAG was found in the break and reconnection sites of CBFB and PPP1R7, thus supporting the formation of CBFB::PPP1R7 by microhomology-mediated end joining.
- Subjects
ACUTE myeloid leukemia; FLUORESCENCE in situ hybridization; CHROMOSOME abnormalities; WHOLE genome sequencing; PHOSPHOPROTEIN phosphatases; NUCLEOPHOSMIN; CONTRACTILE proteins
- Publication
Genes, 2022, Vol 13, Issue 8, p1367
- ISSN
2073-4425
- Publication type
Article
- DOI
10.3390/genes13081367