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Loss of Tumor Suppressor Gene Functions01:12

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Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
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Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
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The Ras Gene02:38

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The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
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  11. Gain- And Loss-of-function Mutations In The Breast Cancer Gene Gata3 Result In Differential Drug Sensitivity.

Gain- and Loss-of-Function Mutations in the Breast Cancer Gene GATA3 Result in Differential Drug Sensitivity.

Barbara Mair1,2,3, Tomasz Konopka2,3, Claudia Kerzendorfer1

  • 1CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria.

Plos Genetics
|September 3, 2016

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View abstract on PubMed

Summary
This summary is machine-generated.

GATA3 mutations in breast cancer exhibit dual tumor-suppressive and oncogenic roles, influencing patient survival and offering new therapeutic targets through epigenetic regulation.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Somatic mutations in cancer genes inform tumor development and therapeutic strategies.
  • The traditional oncogene/tumor suppressor classification may not fully capture gene function, as seen with TP53.
  • GATA3 is a frequently mutated gene in breast cancer with an incompletely understood role.

Purpose of the Study:

  • To investigate the functional roles of GATA3 mutations in breast cancer.
  • To explore the therapeutic potential of targeting mutant GATA3.
  • To determine if GATA3 exhibits dual tumor-suppressive and oncogenic activities.

Main Methods:

  • Analysis of somatic mutation patterns in breast cancer genes.
  • Functional characterization of GATA3 frameshift mutations using cell line models.

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  • Assessment of gene expression profiles and patient survival data.
  • Identification of synthetic lethal interactions with epigenetic modifiers.

    • Main Results:

    • Two distinct functional classes of GATA3 frameshift mutations were identified.
    • These mutation classes correlate with different tumor expression profiles and patient survival outcomes.
    • A GATA3 mutant with an extended C-terminus showed a synthetic lethal interaction with G9A/GLP, suggesting epigenetic dysregulation.
    • Evidence for both tumor-suppressive and oncogenic activities of mutant GATA3 was found.

    Conclusions:

    • GATA3 mutations have complex roles in breast cancer, exhibiting both tumor-suppressive and oncogenic functions.
    • Mutant GATA3 impacts tumor biology and patient prognosis.
    • Targeting epigenetic regulators like G9A/GLP presents a potential therapeutic strategy for specific GATA3 mutant-driven breast cancers.
    • The dual function of GATA3 highlights the complexity of gene roles in tumorigenesis and suggests such duality may be common.