Carcinogenesis · Pathology

The Philadelphia chromosome, t(9;22), creates a fusion gene that encodes a constitutively active:

  1. Transcription factor
  2. Tyrosine kinase
  3. Ion channel
  4. RNA polymerase
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Correct answer: Tyrosine kinase

The t(9;22) translocation fuses the BCR and ABL genes. The resulting BCR-ABL protein is a mutant tyrosine kinase that is always active, driving the uncontrolled proliferation of myeloid cells in Chronic Myeloid Leukemia (CML).

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