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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 Splicing02:18

Alternative RNA Splicing

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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.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
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Alternative RNA Splicing02:18

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pre-mRNA Processing02:01

pre-mRNA Processing

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In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl...
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Non-LTR Retrotransposons03:18

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As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
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Nonsense-mediated mRNA Decay02:27

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The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
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Use of Alu Element Containing Minigenes to Analyze Circular RNAs
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Use of Alu Element Containing Minigenes to Analyze Circular RNAs

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Ku limits aberrant mRNA splicing promoted by intronic antisense Alu elements.

Giovanni Pascarella1, Mariia Mikhova2,3, Gargi Parkhi4,5

  • 1RIKEN Center for Integrative Medical Sciences (IMS), Yokohama Japan.

Biorxiv : the Preprint Server for Biology
|December 3, 2025
PubMed
Summary
This summary is machine-generated.

Ku proteins prevent harmful mRNA splicing errors caused by Alu elements in primate genomes. Ku depletion leads to cell death, indicating Ku

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Area of Science:

  • Genomics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Alu elements comprise ~10% of the human genome and have shaped primate evolution.
  • Alu expansion correlates with increased DNA-dependent protein kinase (DNA-PK) expression in higher primates.
  • Elevated Ku70/80 levels may prevent immune activation by Alu-derived RNA.

Purpose of the Study:

  • To investigate the role of Ku in regulating mRNA splicing in the context of Alu elements.
  • To determine if primate-specific Ku70 features are necessary for genomic stability in Alu-rich genomes.

Main Methods:

  • Ku ablation in cell lines.
  • Analysis of mRNA splicing patterns.
  • Comparison of primate and prosimian Ku70 homologues.

Main Results:

  • Ku ablation causes significant alterations in mRNA splicing, activating alternative splice sites within intronic antisense Alu elements.
  • Dysregulated splicing impacts genes crucial for RNA metabolism and cell viability, preceding cell death.
  • Primate Ku70 cannot rescue cell death in Ku-depleted cells, unlike its prosimian homologue.

Conclusions:

  • Ku binding to antisense Alu elements in introns is critical for modulating alternative splicing.
  • This modulation balances the beneficial and detrimental effects of Alu repeats in primate genomes.
  • Primate Ku70 has evolved specialized functions to manage the challenges posed by an Alu-rich genome.