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Related Experiment Videos

ALL-1 partial duplication in acute leukemia

S A Schichman1, M A Caligiuri, Y Gu

  • 1Jefferson Cancer Institute, Jefferson Cancer Center, Jefferson Medical College of Thomas Jefferson University, Philadelphia, PA 19107.

Proceedings of the National Academy of Sciences of the United States of America
|June 21, 1994
PubMed
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A partial duplication of the ALL-1 gene, a protooncogene, was found in acute myeloid leukemia patients. This genetic mechanism contributes to leukemogenesis and may be indicated by trisomy in malignancies.

Area of Science:

  • Genetics
  • Molecular Biology
  • Oncology

Background:

  • The ALL-1 gene (gene name: KMT2A) is frequently involved in chromosomal translocations in acute leukemias.
  • These translocations typically occur at chromosome band 11q23.
  • ALL-1 gene rearrangements are detected in 5-10% of human acute leukemias.

Purpose of the Study:

  • To characterize novel ALL-1 gene rearrangements in acute myeloid leukemia (AML) patients.
  • To investigate the role of partial ALL-1 gene duplication in leukemogenesis.
  • To explore the association between trisomy 11 and ALL-1 gene alterations.

Main Methods:

  • Southern blot analysis to detect gene rearrangements.
  • Cloning of ALL-1 rearrangements from patient samples.

Related Experiment Videos

  • RNA Polymerase Chain Reaction (PCR) and DNA sequencing to analyze gene transcripts and mutations.

    • Main Results:

    • Identified direct tandem duplication of ALL-1 gene exons 2-6 in two AML patients with trisomy 11.
    • Detected partial ALL-1 duplication in an AML patient with a normal karyotype.
    • Confirmed transcription of the duplicated ALL-1 gene into mRNA encoding a partially duplicated protein.

    Conclusions:

    • Partial duplication of the ALL-1 gene represents a novel mechanism for leukemogenesis.
    • Trisomy in malignancy may sometimes indicate underlying partial duplication of a protooncogene.
    • These findings expand the understanding of genetic alterations in AML.