FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Human Disease Model Report: chronic myeloid leukemia, BCR-ABL1 fusions
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General Information
Name
chronic myeloid leukemia, BCR-ABL1 fusions
FlyBase ID
FBhh0001049
Disease Ontology Term
Parent Disease
Overview

This report describes chronic myeloid leukemia (CML). CML is most frequently caused by a cytogenetic abnormality known as the Philadelphia chromosome, where part of chromosome 22 translocates to chromosome 9. This creates a constitutively active fusion product of the human genes BCR and ABL1, both kinases.

Multiple groups have introduced a BCR-ABL1 fusion gene into flies (Hsap\ABL1::Hsap\BCR, Abl::Hsap\ABL1::Hsap\BCR). Expression of BCR-ABL1 in the eye produces undifferentiated, dysfunctional eyes, and lethality when expressed in the CNS. Expression in the lymph gland (the hematopoietic organ in Drosophila) causes hemocytes to aggregate and form melanotic nodules, a sign of excessive hematopoiesis. Use of the eye phenotypes has allowed screening of CML therapeutic drug candidates and regimens.

A mutation within the ABL1 kinase domain of the fusion protein is associated with resistance to tyrosine kinase inhibitors frequently used in treatment of CML. This mutation, ABL1:p.Thr315Ile , has been introduced into one of the BCR-ABL1 fusion constructs and has been characterized in flies, particularly in terms of mechanisms of drug resistance.

[updated Feb. 2020 by FlyBase; FBrf0222196]

Disease Summary Information
Disease Summary: chronic myeloid leukemia, BCR-ABL1 fusions
OMIM report

[LEUKEMIA, CHRONIC MYELOID; CML](https://omim.org/entry/608232)

Human gene(s) implicated

[ABL PROTOONCOGENE 1, NONRECEPTOR TYROSINE KINASE; ABL1](https://omim.org/entry/189980)

[BCR ACTIVATOR OF RhoGEF AND GTPase; BCR](https://omim.org/entry/151410)

Symptoms and phenotype

Chronic myeloid leukemia (CML) is a clonal myeloproliferative disorder of a pluripotent stem cell with a specific cytogenetic abnormality, the Philadelphia chromosome (Ph), involving myeloid, erythroid, megakaryocytic, B lymphoid, and sometimes T lymphoid cells, but not marrow fibroblasts. [from MIM:608232, 06.07.2019]

Genetics

95% of CML patients have the translocation event which creates the constitutively active protein tyrosine kinase fusion gene BCR-ABL1. (Bernardoni et al. 2018 and references therein, FBrf0241911.)

Chronic myeloid leukemia is most frequently caused by a translocation between chromosomes 22 and 9, creating a BCR/ABL fusion gene encoding a tyrosine kinase. A distinct feature of disease progression is the appearance of additional cytogenetic abnormalities in the Ph-positive cells. This phenomenon, known as clonal evolution, frequently involves a second Ph, trisomy of chromosome 8, and isochromosome 17 and other abnormalities of chromosome 17 (Kantarjian et al., 1988, pubmed:3162181), although other abnormalities have been described. [from MIM:608232, 06.07.2019]

Cellular phenotype and pathology
Molecular information
External links
Disease synonyms
BCR-ABL
chronic myelogenous leukemia
CML
Ortholog Information
Human gene(s) in FlyBase
Human gene (HGNC)
D. melanogaster ortholog (based on DIOPT)
Comments on ortholog(s)

One to one: one human gene to one Drosophila gene.

Human gene (HGNC)
D. melanogaster ortholog (based on DIOPT)
Comments on ortholog(s)

One to one: one human gene to one Drosophila gene.

Other mammalian ortholog(s) used
    D. melanogaster Gene Information (2)
    Gene Snapshot
    Abl tyrosine kinase (Abl) encodes a non-receptor tyrosine kinase best known for its ortholog's role in human leukemia. It phosphorylates cell adhesion and cytoskeletal proteins and acts as a scaffold in a signaling complex to regulate both epithelial and nervous system morphogenesis. [Date last reviewed: 2019-03-07]
    Gene Groups / Pathways
    Comments on ortholog(s)

    Single, moderate-ranking ortholog of human ABL1.

    Orthologs and Alignments from DRSC
    DIOPT - DRSC Integrative Ortholog Prediction Tool - Click the link below to search for orthologs in Humans
    Gene Snapshot
    Rho GTPase activating protein at 1A (RhoGAP1A) encodes a protein involved in Golgi organization and cell growth inhibition. [Date last reviewed: 2019-07-11]
    Cellular component (GO)
    Gene Groups / Pathways
    Comments on ortholog(s)

    Single, high-ranking ortholog of human BCR.

    Orthologs and Alignments from DRSC
    DIOPT - DRSC Integrative Ortholog Prediction Tool - Click the link below to search for orthologs in Humans
    Other Genes Used: Viral, Bacterial, Synthetic (0)
      Summary of Physical Interactions (22 groups)
      protein-protein
      Interacting group
      Assay
      References
      protein kinase assay, autoradiography, enzymatic study
      pull down, western blot, enzymatic study, inferred by author
      anti bait coimmunoprecipitation, western blot, anti tag western blot
      protein kinase assay, autoradiography
      pull down, Identification by mass spectrometry
      anti bait coimmunoprecipitation, western blot
      anti tag coimmunoprecipitation, anti tag western blot
      pull down, autoradiography, enzymatic study, anti tag coimmunoprecipitation, anti tag western blot
      far western blotting, anti tag western blot, pull down, western blot, enzymatic study, autoradiography, peptide massfingerprinting
      protein kinase assay, autoradiography
      pull down, anti tag western blot, anti tag coimmunoprecipitation, western blot
      pull down, Identification by mass spectrometry
      enzymatic study, surface plasmon resonance, pull down, autoradiography, western blot
      two hybrid, anti tag coimmunoprecipitation, western blot, pull down, anti tag western blot
      anti bait coimmunoprecipitation, western blot
      anti tag coimmunoprecipitation, anti tag western blot
      enzymatic study, autoradiography
      surface plasmon resonance, enzymatic study
      pull down, autoradiography, anti tag coimmunoprecipitation, anti tag western blot, western blot
      pull down, anti tag western blot
      Alleles Reported to Model Human Disease (Disease Ontology) (9 alleles)
      Models Based on Experimental Evidence ( 0 )
      Allele
      Disease
      Evidence
      References
      Modifiers Based on Experimental Evidence ( 4 )
      Models Based on Experimental Evidence ( 3 )
      Modifiers Based on Experimental Evidence ( 1 )
      Models Based on Experimental Evidence ( 2 )
      Modifiers Based on Experimental Evidence ( 0 )
      Allele
      Disease
      Interaction
      References
      Alleles Representing Disease-Implicated Variants
      Genetic Tools, Stocks and Reagents
      Sources of Stocks
      Contact lab of origin for a reagent not available from a public stock center.
      Bloomington Stock Center Disease Page
      Related mammalian, viral, bacterial, or synthetic transgenes
      Allele
      Transgene
      Publicly Available Stocks
      Selected Drosophila transgenes
      Allele
      Transgene
      Publicly Available Stocks
      RNAi constructs available
      Allele
      Transgene
      Publicly Available Stocks
      Selected Drosophila classical alleles
      Allele
      Allele class
      Mutagen
      Publicly Available Stocks
      amorphic allele - molecular evidence
      CRISPR/Cas9
      amorphic allele - genetic evidence
      References (14)