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A cryptic EWSR1::DD...
A cryptic EWSR1::DDIT3 fusion in myxoid liposarcoma: Potential pitfalls with FISH and cytogenetics
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Ibstedt, Sebastian (author)
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- de Mattos, Camila Bedeschi Rego (author)
- Skåne University Hospital
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- Köster, Jan (author)
- Lund University,Lunds universitet,Avdelningen för klinisk genetik,Institutionen för laboratoriemedicin,Medicinska fakulteten,Genetiska avvikelser i mjukdelstumörer,Forskargrupper vid Lunds universitet,LUCC: Lunds universitets cancercentrum,Övriga starka forskningsmiljöer,Division of Clinical Genetics,Department of Laboratory Medicine,Faculty of Medicine,The genetics of soft tissue tumors,Lund University Research Groups,LUCC: Lund University Cancer Centre,Other Strong Research Environments
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- Mertens, Fredrik (author)
- Lund University,Lunds universitet,Avdelningen för klinisk genetik,Institutionen för laboratoriemedicin,Medicinska fakulteten,Genetiska avvikelser i mjukdelstumörer,Forskargrupper vid Lunds universitet,LUCC: Lunds universitets cancercentrum,Övriga starka forskningsmiljöer,Division of Clinical Genetics,Department of Laboratory Medicine,Faculty of Medicine,The genetics of soft tissue tumors,Lund University Research Groups,LUCC: Lund University Cancer Centre,Other Strong Research Environments
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(creator_code:org_t)
- 2022-11-24
- 2023
- English 4 s.
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In: Genes Chromosomes and Cancer. - : Wiley. - 1045-2257 .- 1098-2264. ; 62:3, s. 167-170
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Abstract
Subject headings
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- Myxoid liposarcoma (MLS) is molecularly characterized by fusions involving the DDIT3 gene in chromosome band 12q13; the fusion partner is FUS in band 16p11 in 90–95% of the cases and EWSR1 in band 22q12 in the remaining 5–10%. Hence, molecular studies, often fluorescence in situ hybridization (FISH) for DDIT3 rearrangement, are useful for establishing a correct diagnosis. Although all MLS tumors should have DDIT3 fusions, it is important to be aware of reasons for potential false-negative results. We here present a case of MLS that was negative for FISH for DDIT3, that showed an unexpected t(11;22) at G-banding, but that displayed a characteristic EWSR1::DDIT3 fusion at RNA-sequencing. The results suggest that neoplasia-associated fusions that, due to the transcriptional orientations of the two genes involved, cannot arise through only two double-strand breaks are more likely to be associated with negative FISH-findings and unexpected karyotypes.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Cancer och onkologi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Cancer and Oncology (hsv//eng)
Keyword
- cryptic
- FISH
- fusion
- liposarcoma
- transcriptional orientation
Publication and Content Type
- art (subject category)
- ref (subject category)
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