FN1-EGF gene fusions are recurrent in calcifying aponeurotic fibroma.

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Calcifying aponeurotic fibroma (CAF) is a soft tissue neoplasm with a predilection for the hands and feet in children and adolescents. Its molecular basis is unknown. We used chromosome banding analysis, fluorescence in situ hybridization (FISH), mRNA sequencing (RNA-seq), RT-PCR and immunohistochemistry to characterize a series of CAFs. An insertion ins(2;4)(q35;q25q?) was identified in the index case. Fusion of the FN1 and EGF genes, mapping to the breakpoint regions on chromosomes 2 and 4, respectively, were detected by RNA-seq and confirmed by RT-PCR in the index case and two additional cases. FISH on five additional tumour identified FN1-EGF fusions in all cases. CAFs analysed by RT-PCR showed that FN1 exon 23, 27 or 42 were fused to EGF exon 17 or 19. High level expression of the entire FN1 gene in CAF suggests that strong FN1 promoter activity drives inappropriate expression of the biologically active portion of EGF which was detected immunohistochemically in 8/9 cases. The FN1-EGF fusion, which has not been observed in any other neoplasm, appears to be the main driver mutation in CAF. Although further functional studies are required to understand the exact pathogenesis of CAF, the composition of the chimera suggests an autocrine/paracrine mechanism of transformation.


Enheter & grupper
Externa organisationer
  • Royal Orthopaedic Hospital
  • Skåne University Hospital

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Cancer och onkologi
  • Medicinsk genetik
Sidor (från-till)502-507
TidskriftJournal of Pathology
Utgåva nummer4
Tidigt onlinedatum2015 dec 22
StatusPublished - 2016
Peer review utfördJa