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Initiation of Translation02:33

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Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
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Transcription Initiation

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Initiation is the first step of transcription in eukaryotes. Prokaryotic RNA Polymerase (RNAP) can bind to the template DNA and start transcribing. On the other hand, transcription in eukaryotes requires additional proteins, called transcription factors, to first bind to the promoter region in the DNA template. This binding helps recruit the specific RNAP that can assemble on the DNA and start transcription.
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The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
Two states at the origin of replication
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Early diagnosis and treatment can often cure cancer. However, even with treatment, residual cells called cancer stem cells (CSC) might remain, often causing tumor recurrence. These cancer stem cells possess the potential for self-renewal and multi-lineage differentiation and are often responsible for the therapeutic resistance displayed in most cancers.
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Tumor initiating cells.

Nitu Bansal1, Debabrata Banerjee

  • 1Cancer Institute of New Jersey, RWJMS/UMDNJ, 195 Little Albany Street, New Brunswick, NJ 08903, USA. tibrewni@umdnj.edu

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Cancer stem cells (CSCs) possess self-renewal and differentiation abilities, similar to normal stem cells. Targeting these tumor-initiating cells (TICs) alongside conventional therapies may improve cancer treatment outcomes.

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Area of Science:

  • Oncology
  • Stem Cell Biology
  • Cancer Research

Background:

  • Cancer stem cells (CSCs) share self-renewal and differentiation properties with normal stem cells.
  • The precise cellular origin of CSCs, whether from deregulated stem cells or reprogrammed progenitor cells, remains undetermined.
  • CSCs, also known as tumor-initiating cells (TICs), are crucial for tumor development, progression, and therapeutic resistance.

Purpose of the Study:

  • To review the characteristics and isolation methods of cancer stem cells.
  • To discuss the role of TICs in tumor progression and treatment response.
  • To explore therapeutic strategies targeting TICs.

Main Methods:

  • Review of existing literature on cancer stem cell isolation and characterization.
  • Analysis of techniques used for identifying tumor-initiating cells.
  • Discussion of therapeutic approaches targeting CSCs.

Main Results:

  • CSCs are a distinct cell population within tumors with stem-like properties.
  • TICs are implicated in tumor growth, metastasis, and recurrence after therapy.
  • Current research employs methods adapted from hematopoietic stem cell isolation.

Conclusions:

  • Understanding CSCs is vital for developing effective cancer therapies.
  • Targeting TICs holds promise for improving treatment efficacy and preventing relapse.
  • Combined therapeutic strategies involving conventional treatments and CSC-targeting approaches are being investigated.