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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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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
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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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A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is comprised  of nucleotides and proteins are comprised of amino acids, a mediator is required to convert the information encoded in DNA into proteins. This mediator is the messenger RNA (mRNA). mRNA copies the blueprint from DNA by a process called transcription. In eukaryotes, transcription occurs in the nucleus by complementary base-pairing with the DNA template. The mRNA is then...
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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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Identifying the Effects of BRCA1 Mutations on Homologous Recombination using Cells that Express Endogenous Wild-type BRCA1
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Genetic modulation of RNA splicing rescues BRCA2 function in mutant cells.

Beatriz Anjo Lima1, Ana Carolina Pais1, Juliette Dupont2

  • 1Faculdade de Medicina da Universidade de Lisboa, Lisboa, Portugal.

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Summary

Researchers explored how a BRCA2 gene variant affects RNA splicing, finding it produces truncated proteins. Modulating splicing restored BRCA2 function, offering a potential cancer prevention strategy.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Cancer Research

Background:

  • Hereditary cancer is often linked to mutations in BRCA1 and BRCA2 genes.
  • Gene variants can disrupt RNA splicing, leading to truncated proteins.
  • Quantitative analysis of variant-specific splicing isoforms is limited.

Purpose of the Study:

  • To investigate the splicing consequences of the BRCA2:c.681+5G>C variant.
  • To analyze the functional impact of variant-specific BRCA2 isoforms on DNA repair.
  • To explore therapeutic strategies for restoring BRCA2 function through splicing modulation.

Main Methods:

  • Droplet digital RT-PCR was used to identify and quantify mRNA isoforms.
  • CRISPR-Cas9 gene editing was employed to induce in-frame transcripts.
  • DNA repair capacity was assessed by measuring RAD51 focus formation and chromosomal breaks.

Main Results:

  • Two variant-specific mRNA isoforms were identified for BRCA2:c.681+5G>C.
  • The predominant isoform was out-of-frame, leading to nonsense-mediated decay.
  • Homozygous cells showed reduced BRCA2 protein, DNA repair defects, and increased chromosomal instability.
  • CRISPR-Cas9 editing restored in-frame transcripts, increasing protein levels and DNA repair efficiency.

Conclusions:

  • The BRCA2:c.681+5G>C variant significantly impacts RNA splicing and protein function.
  • Splicing modulation represents a promising therapeutic approach to restore BRCA2 function.
  • Targeting splicing defects could offer a novel strategy for hereditary cancer prevention.