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Title: Fli1  
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Subject: ETS transcription factor family, SAP1a, Trisomy 16, Cat eye syndrome, Follicular lymphoma
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Fli-1 proto-oncogene, ETS transcription factor

PDB rendering based on 1fli.
Available structures
PDB Ortholog search: PDBe, RCSB
Symbols  ; EWSR2; SIC-1
External IDs GeneCards:
RNA expression pattern
Species Human Mouse
RefSeq (mRNA)
RefSeq (protein)
Location (UCSC)
PubMed search

Friend leukemia integration 1 transcription factor (FLI1), also known as transcription factor ERGB, is a protein that in humans is encoded by the FLI1 gene, which is a proto-oncogene.[1][2][3]


Fli-1 is a member of the ETS transcription factor family that was first identified in erythroleukemias induced by Friend Murine Leukemia Virus (F-MuLV). Fli-1 is activated through retroviral insertional mutagenesis in 90% of F-MuLV-induced erythroleukemias. The constitutive activation of fli-1 in erythroblasts leads to a dramatic shift in the Epo/Epo-R signal transduction pathway, blocking erythroid differentiation, activating the Ras pathway, and resulting in massive Epo-independent proliferation of erythroblasts. These results suggest that Fli-1 overexpression in erythroblasts alters their responsiveness to Epo and triggers abnormal proliferation by switching the signaling event(s) associated with terminal differentiation to proliferation.

Clinical significance

In addition to Friend erythroleukemia, proviral integration at the fli-1 locus also occurs in leukemias induced by the 10A1, Graffi, and Cas-Br-E viruses. Fli-1 aberrant expression is also associated with chromosomal abnormalities in humans. In pediatric Ewing’s sarcoma a chromosomal translocation generates a fusion of the 5’ transactivation domain of EWS with the 3’ Ets domain of Fli-1. The resulting fusion oncoprotein, EWS/Fli-1, acts as an aberrant transcriptional activator.[4] with strong transforming capabilities. The importance of Fli-1 in the development of human leukemia, such as acute myelogenous leukemia (AML), has been demonstrated in studies of translocation involving the Tel transcription factor, which interacts with Fli-1 through protein-protein interactions. A recent study has demonstrated high levels of Fli-1 expression in several benign and malignant neoplasms using immunohistochemistry.

A possible association with Paris-Trousseau syndrome has been suggested.[5]


  1. ^ Baud V, Lipinski M, Rassart E, Poliquin L, Bergeron D (September 1991). "The human homolog of the mouse common viral integration region, FLI1, maps to 11q23-q24". Genomics 11 (1): 223–4.  
  2. ^ Prasad DD, Rao VN, Reddy ES (October 1992). "Structure and expression of human Fli-1 gene". Cancer Research 52 (20): 5833–7.  
  3. ^ Rao VN, Ohno T, Prasad DD, Bhattacharya G, Reddy ES (August 1993). "Analysis of the DNA-binding and transcriptional activation functions of human Fli-1 protein". Oncogene 8 (8): 2167–73.  
  4. ^ Ohno T, Rao VN, Reddy ES (December 1993). "EWS/Fli-1 chimeric protein is a transcriptional activator". Cancer Res. 53 (24): 5859–63.  
  5. ^ Raslova H, Komura E, Le Couédic JP, Larbret F, Debili N, Feunteun J, Danos O, Albagli O, Vainchenker W, Favier R (July 2004). "FLI1 monoallelic expression combined with its hemizygous loss underlies Paris-Trousseau/Jacobsen thrombopenia". J. Clin. Invest. 114 (1): 77–84.  

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This article incorporates text from the United States National Library of Medicine, which is in the public domain.

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