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Related Concept Videos

RNA Splicing01:32

RNA Splicing

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Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
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Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
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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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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
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Tumorigenic de-differentiation: the alternative splicing way.

Debleena Ray1, David M Epstein1

  • 1Cancer & Stem Cell Biology Program, Duke-NUS Medical School, Singapore, Singapore.

Molecular & Cellular Oncology
|November 25, 2020
PubMed
Summary

Scientists discovered a new mechanism driving cancer progression and relapse. Muscleblind like-1 (MBNL1) protein controls alternative splicing, leading to tumor cell de-differentiation and poorer patient outcomes in common cancers.

Keywords:
JNKJNK inhibitorsMAP2K7MBNL1RNA binding proteinsalternative splicingcancer cell de-differentiationcancer stem cellssplice factors

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Area of Science:

  • Cancer Biology
  • Molecular Oncology
  • Cellular Differentiation

Background:

  • Understanding how cancer cells acquire and maintain tumorigenic properties is crucial for developing effective treatments.
  • Tumorigenic de-differentiation, a process where cancer cells lose their specialized functions, is linked to aggressive disease and relapse.
  • Alternative splicing, a process regulating gene expression, is increasingly recognized for its role in cancer development.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying the acquisition of tumorigenic properties during cancer onset and relapse.
  • To identify key regulators of cellular de-differentiation in cancer.
  • To investigate the role of alternative splicing in cancer progression and patient prognosis.

Main Methods:

  • Analysis of gene expression and alternative splicing patterns in cancer tissues.
  • Functional studies using cell lines and preclinical models to assess the impact of MBNL1.
  • Correlation of splicing alterations with clinical data, including prognosis, relapse, and metastasis.

Main Results:

  • A novel Muscleblind like-1 (MBNL1)-driven alternative splicing mechanism was identified as a driver of tumorigenic de-differentiation.
  • This MBNL1-mediated splicing dysregulation is associated with poor prognosis, increased risk of relapse, and metastasis in common cancer types.
  • The findings highlight MBNL1 as a potential therapeutic target for improving cancer outcomes.

Conclusions:

  • MBNL1-regulated alternative splicing represents a critical mechanism contributing to cancer de-differentiation and progression.
  • Targeting the MBNL1 splicing pathway may offer a novel strategy to combat cancer relapse and metastasis.
  • This discovery provides new insights into the fundamental biology of cancer and identifies potential biomarkers for patient stratification.